- Approval Id
- 0a27587128389dd6
- Drug Approval Emc Name
- Well Pharmaceuticals Night Cold & Flu Oral Solution
- Drug Name
- Well Pharmaceuticals Night Cold & Flu Oral Solution
- Company Name
- Pinewood Healthcare
- Company Address
- Ballymacarby, Clonmel, Co. Tipperary, Co. Tipperary, Ireland
- Company Website
- http://www.pinewood.ie
- Company Telephone
- +353 52 6186000
- Company Medical Info Direct Line
- +353 52 6186000
- Company Medical Info Email
- drug.safety@pinewood.ie
- Company Medical Info Fax
- +353 52 6136311
- Atc Code
- N02BE01, R06AD02, R05DA09
- Legal Category
- Pharmacy
- Authorisation Holder
- Pinewood Laboratories Limited
Ballymacarbry
Clonmel
Co. Tipperary
Ireland
- Authorisation Number
- PL 04917/0053
- Authorisation Date
- Date of first authorisation: 5th November 2009
Date of latest renewal: 4th November 2014
- Instruction Authorisation Holder
- Pinewood Laboratories Limited
Ballymacarbry
Clonmel
Co. Tipperary
Ireland
- Instruction Authorisation Number
- PL 04917/0053
- Instruction Authorisation Date
- Date of first authorisation: 5th November 2009
Date of latest renewal: 4th November 2014
- Instruction Composition
- | | |
| --- | --- |
| Active Constituents | mg/20 ml |
| Paracetamol | 1000.0 |
| Promethazine Hydrochloride | 20.0 |
| Dextromethorphan Hydrobromide | 15.0 |
\*\*Excipients with known effect:\*\*
Each 20 ml of oral solution contains: 2916 mg of ethanol (18.08% v/v), 5180 mg of propylene glycol, 12.9 g of liquid maltitol and 23.52 mg of sodium (see section 4.4).
For the full list of excipients, see section 6.1.
- Instruction Dosage Form
- Oral Solution
Clear green, mint flavoured, sugar free oral solution.
- Instruction Clinical Particulars
- 4.1 Therapeutic indications
For the symptomatic night time relief of colds, chills and influenza consisting of headache, shivers, sore throat pain, tickly cough, runny nose, aches and pains.4.2 Posology and method of administration
\*\*Route of administration\*\*
For oral use. To be taken at bedtime. Shake the bottle before use
Maximum daily dose: Only one dose should be taken per night.
Do not exceed the stated dose
Should not be used with other cough or cold medicines, or any other antihistamine-containing products, including those used on the skin.
\*Adults and children aged 16 years and over:\*
One measured 20 ml dose to be taken just before going to bed.
\*Children aged 12 to 15 years:\*
A 10 ml to 15 ml dose to be taken just before going to bed.
Not to be given to children under 12 years.
\*Elderly:\*
The normal adult dose can be used.
Maximum duration of continued use without medical advice: 3 days.4.3 Contraindications
Hypersensitivity to paracetamol, dextromethorphan, promethazine or any of the other excipients listed in Section 6.1.
Hepatic or renal impairment.
With, or at risk of developing, respiratory failure (e.g. those with chronic obstructive airways disease or pneumonia, or during an asthma attack or an exacerbation of asthma).
Patients taking or have taken monoamine oxidase inhibitors (MAOIs) in the last two weeks.
Dextromethorphan, in common with other centrally acting antitussive agents, should not be given to subjects in, or at risk of developing respiratory failure.
This product is contraindicated in patients taking serotonin reuptake inhibitors (SSRIs, see section 4.5).
Not to be used in children under the age of 12 years.4.4 Special warnings and precautions for use
Medical advice must be sought before taking this product in people with:
• Chronic or persistent cough, such as occurs with asthma, emphysema, or other respiratory disorders; or where the cough is accompanied by excessive secretions unless directed by a physician
• Epilepsy
• Narrow- angle glaucoma
• Urinary retention
• Prostatic hypertrophy
• Cardiovascular problems
Caution is advised if paracetamol is administered concomitantly with flucloxacillin due to increased risk of high anion gap metabolic acidosis (HAGMA), particularly in patients with severe renal impairment, sepsis, malnutrition and other sources of glutathione deficiency (e.g. chronic alcoholism), as well as those using maximum daily doses of paracetamol. Close monitoring, including measurement of urinary 5-oxoproline, is recommended.
Use with caution in the elderly, who are more likely to experience anticholinergic adverse effects including confusion and paradoxical excitation. Avoid use in elderly patients with confusion.
Children are more likely to experience paradoxical excitation with sedating antihistamine.
Medical advice should be sought if symptoms persist, or are accompanied by high fever, skin rash or persistent headache.
There have been no specific studies of this product in renal or hepatic dysfunction. Due to the extensive hepatic metabolism of dextromethorphan, caution should be exercised in the presence of hepatic impairment. Underlying liver disease increases the risk of paracetamol-related liver damage.
This product should not be taken with any other cough and cold medicine.
Use of dextromethorphan with alcohol or other CNS depressants may increase the effects on the CNS and cause toxicity in relatively smaller doses.
This product should be used with caution in atopic children due to histamine release.
Patients with rare hereditary problems of fructose intolerance should not take this medicine.
The hazards of overdose are greater in those with non-cirrhotic alcoholic liver disease.
Do not exceed the stated dose. Always use the measuring cup supplied with the pack.
Patients should be advised not to take other paracetamol-containing products or decongestant-containing medicines concurrently.
If symptoms persist consult your doctor.
Keep all medicines out of sight and reach of children.
Warning: May cause drowsiness. If affected, do not drive or operate machinery.
Avoid alcoholic drink.
\*\*Drug dependence, tolerance and potential for abuse\*\*
For all patients, prolonged use of this product may lead to drug dependence (addiction), even at therapeutic doses. The risks are increased in individuals with current or past history of substance misuse disorder (including alcohol misuse) or mental health disorder (e.g., major depression).
\*\*Drug withdrawal syndrome\*\*
The drug withdrawal syndrome is characterised by some or all of the following: restlessness, lacrimation, rhinorrhoea, yawning, perspiration, chills, myalgia, mydriasis and palpitations. Other symptoms may also develop including irritability, agitation, anxiety, hyperkinesia, tremor, weakness, insomnia, anorexia, abdominal cramps, nausea, vomiting, diarrhoea, increased blood pressure, increased respiratory rate or heart rate.
Cases of dextromethorphan abuse and dependence have been reported. Caution is particularly recommended for adolescents and young adults as well as in patients with a history of drug abuse or psychoactive substances.
Dextromethorphan is metabolised by hepatic cytochrome P450 2D6. The activity of this enzyme is genetically determined. About 10% of the general population are poor metabolisers of CYP2D6. Poor metabolisers and patients with concomitant use of CYP2D6 inhibitors may experience exaggerated and/or prolonged effects of dextromethorphan. Caution should therefore be exercised in patients who are slow metabolizers of CYP2D6 or use CYP2D6 inhibitors (see also section 4.5).'
\*\*\*Serotonin Syndrome\*\*\*
Serotonergic effects, including the development of a potentially life-threatening serotonin syndrome, have been reported for dextromethorphan with concomitant administration of serotonergic agents, such as selective serotonin re-uptake inhibitors (SSRIs), drugs which impair metabolism of serotonin (including monoamine oxidase inhibitors (MAOIs)) and CYP2D6 inhibitors.
Serotonin syndrome may include mental-status changes, autonomic instability, neuromuscular abnormalities, and/or gastrointestinal symptoms.
If serotonin syndrome is suspected, treatment with this medicine should be discontinued.
\*\*\*Special label warnings\*\*\*
Do not take with any other paracetamol-containing products.
Immediate medical advice should be sought in the event of an overdose, even if you feel well.
\*\*\*Special leaflet warnings\*\*\*
Immediate medical advice should be sought in the event of an overdose, even if you feel well, because of the risk of delayed, serious liver damage.
Excipients: Ethanol, Propylene glycol, Sodium and Maltitol.
• Ethanol
This medicinal product contains 2916 mg of ethanol (alcohol) in each 20 ml dose, which is 18.08 v/v %. A dose of 15 ml of this medicine administered to (a child 12 years of age and weighing 40 kg) would result in exposure to 55 mg/kg of ethanol which may cause a rise in blood alcohol concentration (BAC) of about 9.1 mg/100 ml. A dose of 20 ml of this medicine administered to (an adult weighing 70 kg) would result in exposure to 42 mg/kg of ethanol which may cause a rise in blood alcohol concentration (BAC) of about 7.0 mg/100 ml.
For comparison, for an adult drinking a glass of wine or 500 ml of beer, the BAC is likely to be about 50 mg/100 ml. Co-administration with medicines containing e.g. propylene glycol or ethanol may lead to accumulation of ethanol and induce adverse effects, in particular in young children with low or immature metabolic capacity.
The amount of ethanol in this medicine should be taken into account in the following patients/situations: children, patients driving or operating machinery, epilepsy, liver problems, pregnancy, breast-feeding or addiction to alcohol.
• Propylene glycol
This medicinal product contains 5180 mg propylene glycol in each 20 ml, which is equivalent to 259 mg/ml or 220 mg/g. While propylene glycol has not been shown to cause reproductive or developmental toxicity in animals or humans, it may reach the foetus and was found in milk. As a consequence, administration of propylene glycol to pregnant or lactating patients should be considered on a case by case basis.
Various adverse events, such as hyperosmolality, lactic acidosis; renal dysfunction (acute tubular necrosis), acute renal failure; cardiotoxicity (arrhythmia, hypotension); central nervous system disorders (depression, coma, seizures); respiratory depression, dyspnoea; liver dysfunction; haemolytic reaction (intravascular haemolysis) and haemoglobinuria; or multisystem organ dysfunction, have been reported with high doses or prolonged use of propylene glycol. Adverse events usually reverse following weaning off of propylene glycol, and in more severe cases following haemodialysis.
Medical monitoring is required.
• Maltitol
Patients with rare hereditary problems of fructose intolerance should not take this medicine.
• Sodium
This medicinal product contains 23.52 mg of sodium (main component of cooking salt) in each 20 ml dose. This is equivalent to 1.2% of the WHO recommended maximum daily intake of 2 g sodium for an adult.4.5 Interaction with other medicinal products and other forms of interaction
Medical advice should be sought before taking paracetamol-promethazine-dextromethorphan in combination with these drugs:
| | |
| --- | --- |
| Alcohol | Concomitant use of alcohol with dextromethorphan and promethazine may increase the CNS depressant effects of these drugs. The hepatotoxicity of paracetamol may be potentiated by excessive intake of alcohol. Co-administration with medicines containing e.g. propylene glycol or ethanol may lead to accumulation of ethanol and induce adverse effects, in particular in young children with low or immature metabolic capacity. |
| Anticholinergic drugs such as atropine, MAOIs and tricyclic antidepressants | As promethazine has some anticholinergic activity, the effects of some anticholinergic drugs may be potentiated. |
| Cholestyramine | The speed of absorption of paracetamol may be reduced by cholestyramine. |
| CNS depressant drugs such as antipsychotics, hypnotics or anxiolytics | Promethazine and dextromethorphan may potentiate the additive CNS depressant effects of other CNS depressant drugs or alcohol, antihistamines, psychotropics. |
| Metoclopramide and domperidone | The speed of absorption of paracetamol may be increased by metoclopramide or domperidone. |
| Monoamine-oxidase inhibitors (MAOIs) | Severe reactions, including serotonin syndrome (see below), may occur when this product is taken concomitantly, or within two weeks of taking, an MAOI. MAOIs may prolong and intensify the anticholinergic effects of antihistamines. Use of dextromethorphan in patients taking monoamine oxidase inhibitors should be avoided as severe reactions have been reported. |
| Selective serotonin re-uptake inhibitors (SSRIs), tricylic antidepressants or MAOIs | Dextromethorphan should not be used concurrently in patients taking monoamine oxidase inhibitors (MAOIs) or within 14 days of stopping treatment with MAOIs as there is a risk of serotonin syndrome (e.g. hyperpyrexia, hallucinations, gross excitation or coma , mental status, hypertension, restlessness, myoclonus diaphoresis, shivering and tremor ) Antihistamines have an added antimuscarinic effect with other antimuscarinic drugs including tricyclic antidepressants. |
| Warfarin and other coumarins | The anticoagulant effect of warfarin and other coumarins may be enhanced by prolonged regular daily use of paracetamol with increased risk of bleeding; occasional doses have no significant effect. |
| CYP2D6 inhibitors | Dextromethorphan is metabolized by CYP2D6 and has an extensive first-pass metabolism. Concomitant use of potent CYP2D6 enzyme inhibitors can increase the dextromethorphan concentrations in the body to levels multifold higher than normal. This increases the patient's risk for toxic effects of dextromethorphan (agitation, confusion, tremor, insomnia, diarrhoea and respiratory depression) and development of serotonin syndrome. Potent CYP2D6 enzyme inhibitors include fluoxetine, paroxetine, quinidine and terbinafine. In concomitant use with quinidine, plasma concentrations of dextromethorphan have increased up to 20-fold, which has increased the CNS adverse effects of the agent. Amiodarone, flecainide and propafenone, sertraline, bupropion, methadone, cinacalcet, haloperidol, perphenazine and thioridazine also have similar effects on the metabolism of dextromethorphan. If concomitant use of CYP2D6 inhibitors and dextromethorphan is necessary, the patient should be monitored and the dextromethorphan dose may need to be reduced |
| Flucloxacillin | Caution should be taken when paracetamol is used concomitantly with flucloxacillin as concurrent intake has been associated with high anion gap metabolic acidosis, especially in patients with risks factors (see section 4.4). |
Promethazine may interfere with immunologic urine pregnancy test to produce false results.4.6 Pregnancy and lactation
\*Pregnancy\*
This product should not be used during pregnancy without medical advice. Epidemiological studies in human pregnancy have shown no ill effects due to paracetamol used in the recommended dosage, but patients should follow the advice of their doctor regarding its use. A large amount of data on pregnant women indicate neither malformative, nor feto/neonatal toxicity. Epidemiological studies on neurodevelopment in children exposed to paracetamol in utero show inconclusive results. If clinically needed, paracetamol can be used during pregnancy however it should be used at the lowest effective dose for the shortest possible time and at the lowest possible frequency.
No relevant data are available for products containing dextromethorphan. Human and animal studies with promethazine are insufficient to establish the safety of this drug during pregnancy. It should only be used when considered essential by the doctor.
\*Breast-feeding\*
This product should not be used whilst breast feeding without medical advice.
Paracetamol is excreted in breast milk but not in a clinically significant amount. Available published data does not contraindicate breast feeding.
There are also no known contraindications to the use of Promethazine during lactation. Promethazine may be excreted in breast milk. It should only be used when considered essential by a doctor.
It is not known whether dextromethorphan or its metabolites are excreted in breast milk.
As with all medicines, the advice of a doctor should be sought before use of the product in pregnancy and lactation, and it should only be used when considered essential by the doctor.4.7 Effects on ability to drive and use machines
This medicine can impair cognitive function and can affect a patient's ability to drive safely. This class of medicine is in the list of drugs included in regulations under 5a of the Road Traffic Act 1988. When prescribing this medicine, patients should be told:
• The medicine is likely to affect your ability to drive
• Do not drive until you know how the medicine affects you
• It is an offence to drive while under the influence of this medicine
• However, you would not be committing an offence (called 'statutory defence') if:
o The medicine has been prescribed to treat a medical or dental problem and
o You have taken it according to the instructions given by the prescriber and in the information provided with the medicine and
o It was not affecting your ability to drive safely4.8 Undesirable effects
The following convention has been utilized for the classification of undesirable effects: very common (≥1/10), common (≥1/100 to <1/10), uncommon (≥1/1000 to < 1/100), rare (≥1/10,000 to < 1/1000), very rare (<1/10,000), not known (cannot be estimated from available data).
\*\*Paracetamol\*\*
Adverse events of paracetamol from historical clinical trial data are both infrequent and from small patient exposure. Accordingly, events reported from extensive post-marketing experience at therapeutic/labelled dose and considered attributable are tabulated below by system class. The frequency of these adverse is not known.
| | |
| --- | --- |
| \*\*Body System\*\* | \*\*Undesirable effect\*\* |
| Blood and lymphatic system disorders | Thrombocytopenia Agranulocytosis |
| Immune system disorders | Anaphylaxis Cutaneous hypersensitivity reactions including skin rashes, angioedema and Stevens Johnson syndrome/toxic epidermal necrolysis |
| Respiratory thoracic and mediastinal disorders | Bronchospasm\\* |
| Hepatobiliary disorders | Hepatic dysfunction |
\\*There have been cases of bronchospasm with paracetamol, but these are more likely in asthmatics sensitive to aspirin or other NSAIDs.
\*\*Dextromethorphan\*\*
The following adverse events have been observed in published clinical studies and are likely to represent uncommon adverse reactions to dextromethorphan.
| | |
| --- | --- |
| \*\*Body system\*\* | \*\*Undesirable effect\*\* |
| Nervous system disorders | Drowsiness, dizziness |
| Gastrointestinal disorders | Gastrointestinal disturbance, nausea, vomiting, abdominal discomfort |
Adverse reaction identified during post-marketing use with dextromethorphan are listed below. The frequency of these reactions are not known.
| | |
| --- | --- |
| \*\*Body system\*\* | \*\*Undesirable effect\*\* |
| Immune system disorders | Allergic reactions (e.g. rash, urticaria, angiodema) |
| Nervous system disorders | Serotonin syndrome (with changes in mental status, restlessness, myoclonus, hyperreflexia, diaphoresis, shivering, tremor and hypertension) has been reported when dextromethorphan has been taken concurrently with MAOIs or serotonergic drugs such as SSRIs |
ADRs are presented by frequency category based on 1) incidence in adequately designed clinical trials or epidemiology studies, if available, or 2) when incidence cannot be estimated, frequency category is listed as 'Not known'.
| | | |
| --- | --- | --- |
| \*\*Body System\*\* | \*\*Frequency\*\* | \*\*Adverse Drug Reaction (Preferred Term)\*\* |
| General disorders and administration site conditions | Not known | drug withdrawal syndrome |
| Immune System Disorders | Not known Not known Not known Not known | Angioedema Pruritus Rash Urticaria |
| Psychiatric Disorders | Not known Not known Not known | Insomnia Confusional state Drug dependence (see section 4.4) |
| Nervous System Disorders | Not known Not known Not known Not known | Convulsion Dizziness Psychomotor hyperactivity Somnolence |
| Respiratory, thoracic and mediastinal Disorders | Not known | Respiratory depression |
| Gastrointestinal Disorders | Not known Not known Not known Not known Not known | Abdominal pain Diarrhoea Gastrointestinal disturbance Nausea Vomiting |
\*\*Promethazine\*\*
Adverse reactions which been observed in published clinical studies with promethazine and which are considered to be common or very common are listed below by MedDRA System Organ Class. The frequency of other reactions identified during post-marketing use is not known, but these reactions are likely to be uncommon or rare.
| | |
| --- | --- |
| \*\*Body System\*\* | \*\*Undesirable effect\*\* |
| Immune system disorders | Not known: Hypersensitivity reactions including rash, urticaria, angiodema and anaphylaxis, photosensitivity |
| Psychiatric disorders | Not known: Confusion\\*, disorientation\\*, paradoxical excitation\\*, \\*\\*(e.g. increased energy, irritability, restlessness, nervousness, sleep disturbance) |
| Nervous system disorders | Very common: Drowsiness Common: Psychomotor impairment, disturbance in attention, dizziness, headache. |
| Eye disorders | Common: Blurred vision |
| Gastrointestinal disorders | Common: Dry mouth Not Known: Gastrointestinal disturbance |
| Renal and urinary disorders | Not known: Urinary retention |
\\*The elderly are more susceptible to confusion, disorientation and paradoxical excitation
\\*\\*Children are more susceptible to paradoxical excitation
\*\*Reporting of suspected adverse reactions\*\*
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.4.9 Overdose
\*\*Paracetamol\*\*
Liver damage is possible in adults who have taken 10g or more of paracetamol. Ingestion of 5g or more of paracetamol may lead to liver damage if the patient has risk factors (see below).
\*Risk factors\*
If the patient
a) Is on long term treatment with carbamazepine, phenobarbitone, phenytoin, primidone, rifampicin, St John's Wort or other drugs that induce liver enzymes.
or
b) Regularly consumes ethanol in excess of recommended amounts.
or
c) Is likely to be glutathione deplete e.g. eating disorders, cystic fibrosis, HIV infection, starvation, cachexia.
\*Symptoms\* \*and signs:\*
Symptoms of paracetamol overdose in the first 24 hours are pallor, nausea, vomiting, anorexia and abdominal pain. Liver damage may become apparent 12-48 hours after ingestion. Abnormalities of glucose metabolism and metabolic acidosis may occur. In severe poisoning, hepatic failure may progress to encephalopathy, coma and death. Acute renal failure with acute tubular necrosis strongly suggested by loin pain, haematuria and proteinuria, may develop even in the absence of severe liver damage. Cardiac arrhythmias and pancreatitis have been reported. Liver damage is possible in adults who have taken 10 g or more of paracetamol. It is considered that excess quantities of a toxic metabolite (usually adequately detoxified by glutathione when normal doses of paracetamol are ingested); become irreversibly bound to liver tissue.
\*Management:\*
Immediate treatment is essential in the management of paracetamol overdose. Despite a lack of significant early symptoms, patients should be referred to hospital urgently for immediate medical attention. Symptoms may be limited to nausea or vomiting and may not reflect the severity of overdose or the risk of organ damage. Management should be in accordance with established treatment guidelines, see BNF overdose section.
Treatment with activated charcoal should be considered if the overdose has been taken within 1 hour. Plasma paracetamol concentration should be measured at 4 hours or later after ingestion (earlier concentrations are unreliable). Treatment with N-acetylcysteine may be used up to 24 hours after ingestion of paracetamol, however, the maximum protective effect is obtained up to 8 hours post-ingestion. The effectiveness of the antidote declines sharply after this time. If required the patient should be given intravenous N-acetylcysteine, in line with the established dosage schedule. If vomiting is not a problem, oral methionine may be a suitable alternative for remote areas, outside hospital. Management of patients who present with serious hepatic dysfunction beyond 24h from ingestion should be discussed with the NPIS or a liver unit.
\*\*Promethazine Hydrochloride\*\*
\*\*\*Symptoms and signs:\*\*\*
In children, Promethazine overdose can cause CNS stimulation and antimuscarinic effects. Promethazine overdose is likely to result in effects similar to those listed under Adverse Reactions. Additional symptoms may include delirium, agitation, hallucinations, dystonic reactions, hypotension, and ECG changes. Large overdose may cause convulsions, toxic psychosis, arrythmias, coma and cardiorespiratory depression (uncommon).
\*Management:\*
If the patient is seen soon enough after ingestion, it should be possible to induce vomiting with ipecacuanha despite the antiemetic effect of promethazine; alternatively gastric lavage may be used. Treatment otherwise supportive with attention to maintenance of adequate respiratory and circulatory status. Convulsions and marked CNS stimulation should be treated with parenteral diazepam or other suitable anticonvulsants.
\*\*Dextromethorphan\*\*
Effects in overdosage will be potentiated by simultaneous ingestion of alcohol and psychotropic drugs.
\*Symptoms and signs:\*
Dextromethorphan overdose may be associated with nausea, vomiting, dystonia, agitation, confusion, somnolence, stupor, nystagmus, cardiotoxicity (tachycardia, abnormal ECG including QTc prolongation), ataxia, toxic psychosis with visual hallucinations, hyperexcitability.
In the event of massive overdose the following symptoms may be observed: coma, respiratory depression, convulsions.
Other observed symptoms of overdose may include gastrointestinal disturbances, dizziness, restlessness, nervousness and irritability.
\*Management:\*
- Activated charcoal can be administered to asymptomatic patients who have ingested overdoses of dextromethorphan within the preceding hour.
- For patients who have ingested dextromethorphan and are sedated or comatose, naloxone, in the usual doses for treatment of opioid overdose, can be considered.
- Benzodiazepines for seizures and benzodiazepines and external cooling measures for hyperthermia from serotonin syndrome can be used.
- Other general symptomatic and supportive measures should be used including a clear airway and monitoring of vital signs until stable.
- Observe for at least four hours after ingestion, or eight hours if a sustained release preparation has been taken.
- Instruction Pharmacology
- 5.1 Pharmacodynamic properties
| | |
| --- | --- |
| Paracetamol: other analgesics and antipyretics, anilides. | |
| Pharmacotherapeutic Group: | Analgesics and Antipyretics, Anilides |
| ATC Code: | N02B E01 |
| Promethazine Hydrochloride: an antihistamine with anticholinergic activity. | |
| Pharmacotherapeutic Group: | Antihistamines for Systemic Use, Phenothiazine derivatives |
| ATC Code: | R06A D02 |
| Dextromethorphan Hydrobromide: an antitussive | |
| Pharmacotherapeutic Group: | Cough and Cold Preparations, Opium Alkaloids and derivatives |
| ATC Code: | R05D A09 |5.2 Pharmacokinetic properties
\*\*Paracetamol\*\* is readily absorbed from the upper gastrointestinal tract. It is metabolised predominantly in the liver and excreted in the urine, mainly as glucuronide and sulphate conjugates.
\*\*Promethazine Hydrochloride\*\* is readily absorbed from the gastrointestinal tract, but undergoes extensive first pass metabolism in the liver, with only 25% of the oral dose reaching the systemic circulation unchanged. After oral therapy, therapeutic effects are identifiable at 15-30 minutes and peak plasma concentrations at 2 to 3 hours. Estimates of terminal half life in blood plasma are in the range of 4-6 hours. It is extensively plasma protein bound. It is eliminated mainly as metabolites, predominantly by the faecal (via biliary) route, with < 1% of the patient compound and ca. 10% as the sulphoxide metabolite being excreted in the urine over a 72 hour period.
Dextromethorphan undergoes rapid and extensive first-pass metabolism in the liver after oral administration. Genetically controlled O-demethylation (CYD2D6) is the main determinant of dextromethorphan pharmacokinetics in human volunteers.
It appears that there are distinct phenotypes for this oxidation process resulting in highly variable pharmacokinetics between subjects. Unmetabolised dextromethorphan, together with the three demethylated morphinan metabolites dextrorphan (also known as 3-hydroxy-N-methylmorphinan), 3- hydroxymorphinan and 3-methoxymorphinan have been identified as conjugated products in the urine.
Dextrorphan, which also has antitussive action, is the main metabolite. In some individuals metabolism proceeds more slowly and unchanged dextromethorphan predominates in the blood and urine.5.3 Preclinical safety data
Preclinical safety data on these active ingredients in the literature have not revealed any pertinent and conclusive findings which are of relevance to the recommended dosage and use of the product and which have not already been mentioned elsewhere in this summary.
Conventional studies using the currently accepted standards for the evaluation of toxicity to reproduction and development are not available.
- Instruction Pharmaceutical Particulars
- 6.1 List of excipients
ethanol
propylene glycol
liquid maltitol (hydrogenated glucose syrup)
sodium citrate
ascorbic acid
acesulfame k
citric acid monohydrate
natural mint flavour
patent blue v (E131)
quinoline yellow (E104)
purified water6.2 Incompatibilities
None known.6.3 Shelf life
36 months
Shelf life after first opening: 1 month6.4 Special precautions for storage
Do not store above 25°C. Store in the original container. Keep the bottle in the outer carton.6.5 Nature and contents of container
Clear glass bottles – 200 ml with polypropylene child resistant closures.6.6 Special precautions for disposal and other handling
Not applicable.
- Instruction Content
- ## Composition
| | |
| --- | --- |
| Active Constituents | mg/20 ml |
| Paracetamol | 1000.0 |
| Promethazine Hydrochloride | 20.0 |
| Dextromethorphan Hydrobromide | 15.0 |
\*\*Excipients with known effect:\*\*
Each 20 ml of oral solution contains: 2916 mg of ethanol (18.08% v/v), 5180 mg of propylene glycol, 12.9 g of liquid maltitol and 23.52 mg of sodium (see section 4.4).
For the full list of excipients, see section 6.1.
## Pharmaceutical Form
Oral Solution
Clear green, mint flavoured, sugar free oral solution.
## Clinical Particulars
4.1 Therapeutic indications
For the symptomatic night time relief of colds, chills and influenza consisting of headache, shivers, sore throat pain, tickly cough, runny nose, aches and pains.4.2 Posology and method of administration
\*\*Route of administration\*\*
For oral use. To be taken at bedtime. Shake the bottle before use
Maximum daily dose: Only one dose should be taken per night.
Do not exceed the stated dose
Should not be used with other cough or cold medicines, or any other antihistamine-containing products, including those used on the skin.
\*Adults and children aged 16 years and over:\*
One measured 20 ml dose to be taken just before going to bed.
\*Children aged 12 to 15 years:\*
A 10 ml to 15 ml dose to be taken just before going to bed.
Not to be given to children under 12 years.
\*Elderly:\*
The normal adult dose can be used.
Maximum duration of continued use without medical advice: 3 days.4.3 Contraindications
Hypersensitivity to paracetamol, dextromethorphan, promethazine or any of the other excipients listed in Section 6.1.
Hepatic or renal impairment.
With, or at risk of developing, respiratory failure (e.g. those with chronic obstructive airways disease or pneumonia, or during an asthma attack or an exacerbation of asthma).
Patients taking or have taken monoamine oxidase inhibitors (MAOIs) in the last two weeks.
Dextromethorphan, in common with other centrally acting antitussive agents, should not be given to subjects in, or at risk of developing respiratory failure.
This product is contraindicated in patients taking serotonin reuptake inhibitors (SSRIs, see section 4.5).
Not to be used in children under the age of 12 years.4.4 Special warnings and precautions for use
Medical advice must be sought before taking this product in people with:
• Chronic or persistent cough, such as occurs with asthma, emphysema, or other respiratory disorders; or where the cough is accompanied by excessive secretions unless directed by a physician
• Epilepsy
• Narrow- angle glaucoma
• Urinary retention
• Prostatic hypertrophy
• Cardiovascular problems
Caution is advised if paracetamol is administered concomitantly with flucloxacillin due to increased risk of high anion gap metabolic acidosis (HAGMA), particularly in patients with severe renal impairment, sepsis, malnutrition and other sources of glutathione deficiency (e.g. chronic alcoholism), as well as those using maximum daily doses of paracetamol. Close monitoring, including measurement of urinary 5-oxoproline, is recommended.
Use with caution in the elderly, who are more likely to experience anticholinergic adverse effects including confusion and paradoxical excitation. Avoid use in elderly patients with confusion.
Children are more likely to experience paradoxical excitation with sedating antihistamine.
Medical advice should be sought if symptoms persist, or are accompanied by high fever, skin rash or persistent headache.
There have been no specific studies of this product in renal or hepatic dysfunction. Due to the extensive hepatic metabolism of dextromethorphan, caution should be exercised in the presence of hepatic impairment. Underlying liver disease increases the risk of paracetamol-related liver damage.
This product should not be taken with any other cough and cold medicine.
Use of dextromethorphan with alcohol or other CNS depressants may increase the effects on the CNS and cause toxicity in relatively smaller doses.
This product should be used with caution in atopic children due to histamine release.
Patients with rare hereditary problems of fructose intolerance should not take this medicine.
The hazards of overdose are greater in those with non-cirrhotic alcoholic liver disease.
Do not exceed the stated dose. Always use the measuring cup supplied with the pack.
Patients should be advised not to take other paracetamol-containing products or decongestant-containing medicines concurrently.
If symptoms persist consult your doctor.
Keep all medicines out of sight and reach of children.
Warning: May cause drowsiness. If affected, do not drive or operate machinery.
Avoid alcoholic drink.
\*\*Drug dependence, tolerance and potential for abuse\*\*
For all patients, prolonged use of this product may lead to drug dependence (addiction), even at therapeutic doses. The risks are increased in individuals with current or past history of substance misuse disorder (including alcohol misuse) or mental health disorder (e.g., major depression).
\*\*Drug withdrawal syndrome\*\*
The drug withdrawal syndrome is characterised by some or all of the following: restlessness, lacrimation, rhinorrhoea, yawning, perspiration, chills, myalgia, mydriasis and palpitations. Other symptoms may also develop including irritability, agitation, anxiety, hyperkinesia, tremor, weakness, insomnia, anorexia, abdominal cramps, nausea, vomiting, diarrhoea, increased blood pressure, increased respiratory rate or heart rate.
Cases of dextromethorphan abuse and dependence have been reported. Caution is particularly recommended for adolescents and young adults as well as in patients with a history of drug abuse or psychoactive substances.
Dextromethorphan is metabolised by hepatic cytochrome P450 2D6. The activity of this enzyme is genetically determined. About 10% of the general population are poor metabolisers of CYP2D6. Poor metabolisers and patients with concomitant use of CYP2D6 inhibitors may experience exaggerated and/or prolonged effects of dextromethorphan. Caution should therefore be exercised in patients who are slow metabolizers of CYP2D6 or use CYP2D6 inhibitors (see also section 4.5).'
\*\*\*Serotonin Syndrome\*\*\*
Serotonergic effects, including the development of a potentially life-threatening serotonin syndrome, have been reported for dextromethorphan with concomitant administration of serotonergic agents, such as selective serotonin re-uptake inhibitors (SSRIs), drugs which impair metabolism of serotonin (including monoamine oxidase inhibitors (MAOIs)) and CYP2D6 inhibitors.
Serotonin syndrome may include mental-status changes, autonomic instability, neuromuscular abnormalities, and/or gastrointestinal symptoms.
If serotonin syndrome is suspected, treatment with this medicine should be discontinued.
\*\*\*Special label warnings\*\*\*
Do not take with any other paracetamol-containing products.
Immediate medical advice should be sought in the event of an overdose, even if you feel well.
\*\*\*Special leaflet warnings\*\*\*
Immediate medical advice should be sought in the event of an overdose, even if you feel well, because of the risk of delayed, serious liver damage.
Excipients: Ethanol, Propylene glycol, Sodium and Maltitol.
• Ethanol
This medicinal product contains 2916 mg of ethanol (alcohol) in each 20 ml dose, which is 18.08 v/v %. A dose of 15 ml of this medicine administered to (a child 12 years of age and weighing 40 kg) would result in exposure to 55 mg/kg of ethanol which may cause a rise in blood alcohol concentration (BAC) of about 9.1 mg/100 ml. A dose of 20 ml of this medicine administered to (an adult weighing 70 kg) would result in exposure to 42 mg/kg of ethanol which may cause a rise in blood alcohol concentration (BAC) of about 7.0 mg/100 ml.
For comparison, for an adult drinking a glass of wine or 500 ml of beer, the BAC is likely to be about 50 mg/100 ml. Co-administration with medicines containing e.g. propylene glycol or ethanol may lead to accumulation of ethanol and induce adverse effects, in particular in young children with low or immature metabolic capacity.
The amount of ethanol in this medicine should be taken into account in the following patients/situations: children, patients driving or operating machinery, epilepsy, liver problems, pregnancy, breast-feeding or addiction to alcohol.
• Propylene glycol
This medicinal product contains 5180 mg propylene glycol in each 20 ml, which is equivalent to 259 mg/ml or 220 mg/g. While propylene glycol has not been shown to cause reproductive or developmental toxicity in animals or humans, it may reach the foetus and was found in milk. As a consequence, administration of propylene glycol to pregnant or lactating patients should be considered on a case by case basis.
Various adverse events, such as hyperosmolality, lactic acidosis; renal dysfunction (acute tubular necrosis), acute renal failure; cardiotoxicity (arrhythmia, hypotension); central nervous system disorders (depression, coma, seizures); respiratory depression, dyspnoea; liver dysfunction; haemolytic reaction (intravascular haemolysis) and haemoglobinuria; or multisystem organ dysfunction, have been reported with high doses or prolonged use of propylene glycol. Adverse events usually reverse following weaning off of propylene glycol, and in more severe cases following haemodialysis.
Medical monitoring is required.
• Maltitol
Patients with rare hereditary problems of fructose intolerance should not take this medicine.
• Sodium
This medicinal product contains 23.52 mg of sodium (main component of cooking salt) in each 20 ml dose. This is equivalent to 1.2% of the WHO recommended maximum daily intake of 2 g sodium for an adult.4.5 Interaction with other medicinal products and other forms of interaction
Medical advice should be sought before taking paracetamol-promethazine-dextromethorphan in combination with these drugs:
| | |
| --- | --- |
| Alcohol | Concomitant use of alcohol with dextromethorphan and promethazine may increase the CNS depressant effects of these drugs. The hepatotoxicity of paracetamol may be potentiated by excessive intake of alcohol. Co-administration with medicines containing e.g. propylene glycol or ethanol may lead to accumulation of ethanol and induce adverse effects, in particular in young children with low or immature metabolic capacity. |
| Anticholinergic drugs such as atropine, MAOIs and tricyclic antidepressants | As promethazine has some anticholinergic activity, the effects of some anticholinergic drugs may be potentiated. |
| Cholestyramine | The speed of absorption of paracetamol may be reduced by cholestyramine. |
| CNS depressant drugs such as antipsychotics, hypnotics or anxiolytics | Promethazine and dextromethorphan may potentiate the additive CNS depressant effects of other CNS depressant drugs or alcohol, antihistamines, psychotropics. |
| Metoclopramide and domperidone | The speed of absorption of paracetamol may be increased by metoclopramide or domperidone. |
| Monoamine-oxidase inhibitors (MAOIs) | Severe reactions, including serotonin syndrome (see below), may occur when this product is taken concomitantly, or within two weeks of taking, an MAOI. MAOIs may prolong and intensify the anticholinergic effects of antihistamines. Use of dextromethorphan in patients taking monoamine oxidase inhibitors should be avoided as severe reactions have been reported. |
| Selective serotonin re-uptake inhibitors (SSRIs), tricylic antidepressants or MAOIs | Dextromethorphan should not be used concurrently in patients taking monoamine oxidase inhibitors (MAOIs) or within 14 days of stopping treatment with MAOIs as there is a risk of serotonin syndrome (e.g. hyperpyrexia, hallucinations, gross excitation or coma , mental status, hypertension, restlessness, myoclonus diaphoresis, shivering and tremor ) Antihistamines have an added antimuscarinic effect with other antimuscarinic drugs including tricyclic antidepressants. |
| Warfarin and other coumarins | The anticoagulant effect of warfarin and other coumarins may be enhanced by prolonged regular daily use of paracetamol with increased risk of bleeding; occasional doses have no significant effect. |
| CYP2D6 inhibitors | Dextromethorphan is metabolized by CYP2D6 and has an extensive first-pass metabolism. Concomitant use of potent CYP2D6 enzyme inhibitors can increase the dextromethorphan concentrations in the body to levels multifold higher than normal. This increases the patient's risk for toxic effects of dextromethorphan (agitation, confusion, tremor, insomnia, diarrhoea and respiratory depression) and development of serotonin syndrome. Potent CYP2D6 enzyme inhibitors include fluoxetine, paroxetine, quinidine and terbinafine. In concomitant use with quinidine, plasma concentrations of dextromethorphan have increased up to 20-fold, which has increased the CNS adverse effects of the agent. Amiodarone, flecainide and propafenone, sertraline, bupropion, methadone, cinacalcet, haloperidol, perphenazine and thioridazine also have similar effects on the metabolism of dextromethorphan. If concomitant use of CYP2D6 inhibitors and dextromethorphan is necessary, the patient should be monitored and the dextromethorphan dose may need to be reduced |
| Flucloxacillin | Caution should be taken when paracetamol is used concomitantly with flucloxacillin as concurrent intake has been associated with high anion gap metabolic acidosis, especially in patients with risks factors (see section 4.4). |
Promethazine may interfere with immunologic urine pregnancy test to produce false results.4.6 Pregnancy and lactation
\*Pregnancy\*
This product should not be used during pregnancy without medical advice. Epidemiological studies in human pregnancy have shown no ill effects due to paracetamol used in the recommended dosage, but patients should follow the advice of their doctor regarding its use. A large amount of data on pregnant women indicate neither malformative, nor feto/neonatal toxicity. Epidemiological studies on neurodevelopment in children exposed to paracetamol in utero show inconclusive results. If clinically needed, paracetamol can be used during pregnancy however it should be used at the lowest effective dose for the shortest possible time and at the lowest possible frequency.
No relevant data are available for products containing dextromethorphan. Human and animal studies with promethazine are insufficient to establish the safety of this drug during pregnancy. It should only be used when considered essential by the doctor.
\*Breast-feeding\*
This product should not be used whilst breast feeding without medical advice.
Paracetamol is excreted in breast milk but not in a clinically significant amount. Available published data does not contraindicate breast feeding.
There are also no known contraindications to the use of Promethazine during lactation. Promethazine may be excreted in breast milk. It should only be used when considered essential by a doctor.
It is not known whether dextromethorphan or its metabolites are excreted in breast milk.
As with all medicines, the advice of a doctor should be sought before use of the product in pregnancy and lactation, and it should only be used when considered essential by the doctor.4.7 Effects on ability to drive and use machines
This medicine can impair cognitive function and can affect a patient's ability to drive safely. This class of medicine is in the list of drugs included in regulations under 5a of the Road Traffic Act 1988. When prescribing this medicine, patients should be told:
• The medicine is likely to affect your ability to drive
• Do not drive until you know how the medicine affects you
• It is an offence to drive while under the influence of this medicine
• However, you would not be committing an offence (called 'statutory defence') if:
o The medicine has been prescribed to treat a medical or dental problem and
o You have taken it according to the instructions given by the prescriber and in the information provided with the medicine and
o It was not affecting your ability to drive safely4.8 Undesirable effects
The following convention has been utilized for the classification of undesirable effects: very common (≥1/10), common (≥1/100 to <1/10), uncommon (≥1/1000 to < 1/100), rare (≥1/10,000 to < 1/1000), very rare (<1/10,000), not known (cannot be estimated from available data).
\*\*Paracetamol\*\*
Adverse events of paracetamol from historical clinical trial data are both infrequent and from small patient exposure. Accordingly, events reported from extensive post-marketing experience at therapeutic/labelled dose and considered attributable are tabulated below by system class. The frequency of these adverse is not known.
| | |
| --- | --- |
| \*\*Body System\*\* | \*\*Undesirable effect\*\* |
| Blood and lymphatic system disorders | Thrombocytopenia Agranulocytosis |
| Immune system disorders | Anaphylaxis Cutaneous hypersensitivity reactions including skin rashes, angioedema and Stevens Johnson syndrome/toxic epidermal necrolysis |
| Respiratory thoracic and mediastinal disorders | Bronchospasm\\* |
| Hepatobiliary disorders | Hepatic dysfunction |
\\*There have been cases of bronchospasm with paracetamol, but these are more likely in asthmatics sensitive to aspirin or other NSAIDs.
\*\*Dextromethorphan\*\*
The following adverse events have been observed in published clinical studies and are likely to represent uncommon adverse reactions to dextromethorphan.
| | |
| --- | --- |
| \*\*Body system\*\* | \*\*Undesirable effect\*\* |
| Nervous system disorders | Drowsiness, dizziness |
| Gastrointestinal disorders | Gastrointestinal disturbance, nausea, vomiting, abdominal discomfort |
Adverse reaction identified during post-marketing use with dextromethorphan are listed below. The frequency of these reactions are not known.
| | |
| --- | --- |
| \*\*Body system\*\* | \*\*Undesirable effect\*\* |
| Immune system disorders | Allergic reactions (e.g. rash, urticaria, angiodema) |
| Nervous system disorders | Serotonin syndrome (with changes in mental status, restlessness, myoclonus, hyperreflexia, diaphoresis, shivering, tremor and hypertension) has been reported when dextromethorphan has been taken concurrently with MAOIs or serotonergic drugs such as SSRIs |
ADRs are presented by frequency category based on 1) incidence in adequately designed clinical trials or epidemiology studies, if available, or 2) when incidence cannot be estimated, frequency category is listed as 'Not known'.
| | | |
| --- | --- | --- |
| \*\*Body System\*\* | \*\*Frequency\*\* | \*\*Adverse Drug Reaction (Preferred Term)\*\* |
| General disorders and administration site conditions | Not known | drug withdrawal syndrome |
| Immune System Disorders | Not known Not known Not known Not known | Angioedema Pruritus Rash Urticaria |
| Psychiatric Disorders | Not known Not known Not known | Insomnia Confusional state Drug dependence (see section 4.4) |
| Nervous System Disorders | Not known Not known Not known Not known | Convulsion Dizziness Psychomotor hyperactivity Somnolence |
| Respiratory, thoracic and mediastinal Disorders | Not known | Respiratory depression |
| Gastrointestinal Disorders | Not known Not known Not known Not known Not known | Abdominal pain Diarrhoea Gastrointestinal disturbance Nausea Vomiting |
\*\*Promethazine\*\*
Adverse reactions which been observed in published clinical studies with promethazine and which are considered to be common or very common are listed below by MedDRA System Organ Class. The frequency of other reactions identified during post-marketing use is not known, but these reactions are likely to be uncommon or rare.
| | |
| --- | --- |
| \*\*Body System\*\* | \*\*Undesirable effect\*\* |
| Immune system disorders | Not known: Hypersensitivity reactions including rash, urticaria, angiodema and anaphylaxis, photosensitivity |
| Psychiatric disorders | Not known: Confusion\\*, disorientation\\*, paradoxical excitation\\*, \\*\\*(e.g. increased energy, irritability, restlessness, nervousness, sleep disturbance) |
| Nervous system disorders | Very common: Drowsiness Common: Psychomotor impairment, disturbance in attention, dizziness, headache. |
| Eye disorders | Common: Blurred vision |
| Gastrointestinal disorders | Common: Dry mouth Not Known: Gastrointestinal disturbance |
| Renal and urinary disorders | Not known: Urinary retention |
\\*The elderly are more susceptible to confusion, disorientation and paradoxical excitation
\\*\\*Children are more susceptible to paradoxical excitation
\*\*Reporting of suspected adverse reactions\*\*
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.4.9 Overdose
\*\*Paracetamol\*\*
Liver damage is possible in adults who have taken 10g or more of paracetamol. Ingestion of 5g or more of paracetamol may lead to liver damage if the patient has risk factors (see below).
\*Risk factors\*
If the patient
a) Is on long term treatment with carbamazepine, phenobarbitone, phenytoin, primidone, rifampicin, St John's Wort or other drugs that induce liver enzymes.
or
b) Regularly consumes ethanol in excess of recommended amounts.
or
c) Is likely to be glutathione deplete e.g. eating disorders, cystic fibrosis, HIV infection, starvation, cachexia.
\*Symptoms\* \*and signs:\*
Symptoms of paracetamol overdose in the first 24 hours are pallor, nausea, vomiting, anorexia and abdominal pain. Liver damage may become apparent 12-48 hours after ingestion. Abnormalities of glucose metabolism and metabolic acidosis may occur. In severe poisoning, hepatic failure may progress to encephalopathy, coma and death. Acute renal failure with acute tubular necrosis strongly suggested by loin pain, haematuria and proteinuria, may develop even in the absence of severe liver damage. Cardiac arrhythmias and pancreatitis have been reported. Liver damage is possible in adults who have taken 10 g or more of paracetamol. It is considered that excess quantities of a toxic metabolite (usually adequately detoxified by glutathione when normal doses of paracetamol are ingested); become irreversibly bound to liver tissue.
\*Management:\*
Immediate treatment is essential in the management of paracetamol overdose. Despite a lack of significant early symptoms, patients should be referred to hospital urgently for immediate medical attention. Symptoms may be limited to nausea or vomiting and may not reflect the severity of overdose or the risk of organ damage. Management should be in accordance with established treatment guidelines, see BNF overdose section.
Treatment with activated charcoal should be considered if the overdose has been taken within 1 hour. Plasma paracetamol concentration should be measured at 4 hours or later after ingestion (earlier concentrations are unreliable). Treatment with N-acetylcysteine may be used up to 24 hours after ingestion of paracetamol, however, the maximum protective effect is obtained up to 8 hours post-ingestion. The effectiveness of the antidote declines sharply after this time. If required the patient should be given intravenous N-acetylcysteine, in line with the established dosage schedule. If vomiting is not a problem, oral methionine may be a suitable alternative for remote areas, outside hospital. Management of patients who present with serious hepatic dysfunction beyond 24h from ingestion should be discussed with the NPIS or a liver unit.
\*\*Promethazine Hydrochloride\*\*
\*\*\*Symptoms and signs:\*\*\*
In children, Promethazine overdose can cause CNS stimulation and antimuscarinic effects. Promethazine overdose is likely to result in effects similar to those listed under Adverse Reactions. Additional symptoms may include delirium, agitation, hallucinations, dystonic reactions, hypotension, and ECG changes. Large overdose may cause convulsions, toxic psychosis, arrythmias, coma and cardiorespiratory depression (uncommon).
\*Management:\*
If the patient is seen soon enough after ingestion, it should be possible to induce vomiting with ipecacuanha despite the antiemetic effect of promethazine; alternatively gastric lavage may be used. Treatment otherwise supportive with attention to maintenance of adequate respiratory and circulatory status. Convulsions and marked CNS stimulation should be treated with parenteral diazepam or other suitable anticonvulsants.
\*\*Dextromethorphan\*\*
Effects in overdosage will be potentiated by simultaneous ingestion of alcohol and psychotropic drugs.
\*Symptoms and signs:\*
Dextromethorphan overdose may be associated with nausea, vomiting, dystonia, agitation, confusion, somnolence, stupor, nystagmus, cardiotoxicity (tachycardia, abnormal ECG including QTc prolongation), ataxia, toxic psychosis with visual hallucinations, hyperexcitability.
In the event of massive overdose the following symptoms may be observed: coma, respiratory depression, convulsions.
Other observed symptoms of overdose may include gastrointestinal disturbances, dizziness, restlessness, nervousness and irritability.
\*Management:\*
- Activated charcoal can be administered to asymptomatic patients who have ingested overdoses of dextromethorphan within the preceding hour.
- For patients who have ingested dextromethorphan and are sedated or comatose, naloxone, in the usual doses for treatment of opioid overdose, can be considered.
- Benzodiazepines for seizures and benzodiazepines and external cooling measures for hyperthermia from serotonin syndrome can be used.
- Other general symptomatic and supportive measures should be used including a clear airway and monitoring of vital signs until stable.
- Observe for at least four hours after ingestion, or eight hours if a sustained release preparation has been taken.
## Pharmacological Properties
5.1 Pharmacodynamic properties
| | |
| --- | --- |
| Paracetamol: other analgesics and antipyretics, anilides. | |
| Pharmacotherapeutic Group: | Analgesics and Antipyretics, Anilides |
| ATC Code: | N02B E01 |
| Promethazine Hydrochloride: an antihistamine with anticholinergic activity. | |
| Pharmacotherapeutic Group: | Antihistamines for Systemic Use, Phenothiazine derivatives |
| ATC Code: | R06A D02 |
| Dextromethorphan Hydrobromide: an antitussive | |
| Pharmacotherapeutic Group: | Cough and Cold Preparations, Opium Alkaloids and derivatives |
| ATC Code: | R05D A09 |5.2 Pharmacokinetic properties
\*\*Paracetamol\*\* is readily absorbed from the upper gastrointestinal tract. It is metabolised predominantly in the liver and excreted in the urine, mainly as glucuronide and sulphate conjugates.
\*\*Promethazine Hydrochloride\*\* is readily absorbed from the gastrointestinal tract, but undergoes extensive first pass metabolism in the liver, with only 25% of the oral dose reaching the systemic circulation unchanged. After oral therapy, therapeutic effects are identifiable at 15-30 minutes and peak plasma concentrations at 2 to 3 hours. Estimates of terminal half life in blood plasma are in the range of 4-6 hours. It is extensively plasma protein bound. It is eliminated mainly as metabolites, predominantly by the faecal (via biliary) route, with < 1% of the patient compound and ca. 10% as the sulphoxide metabolite being excreted in the urine over a 72 hour period.
Dextromethorphan undergoes rapid and extensive first-pass metabolism in the liver after oral administration. Genetically controlled O-demethylation (CYD2D6) is the main determinant of dextromethorphan pharmacokinetics in human volunteers.
It appears that there are distinct phenotypes for this oxidation process resulting in highly variable pharmacokinetics between subjects. Unmetabolised dextromethorphan, together with the three demethylated morphinan metabolites dextrorphan (also known as 3-hydroxy-N-methylmorphinan), 3- hydroxymorphinan and 3-methoxymorphinan have been identified as conjugated products in the urine.
Dextrorphan, which also has antitussive action, is the main metabolite. In some individuals metabolism proceeds more slowly and unchanged dextromethorphan predominates in the blood and urine.5.3 Preclinical safety data
Preclinical safety data on these active ingredients in the literature have not revealed any pertinent and conclusive findings which are of relevance to the recommended dosage and use of the product and which have not already been mentioned elsewhere in this summary.
Conventional studies using the currently accepted standards for the evaluation of toxicity to reproduction and development are not available.
## Pharmaceutical Particulars
6.1 List of excipients
ethanol
propylene glycol
liquid maltitol (hydrogenated glucose syrup)
sodium citrate
ascorbic acid
acesulfame k
citric acid monohydrate
natural mint flavour
patent blue v (E131)
quinoline yellow (E104)
purified water6.2 Incompatibilities
None known.6.3 Shelf life
36 months
Shelf life after first opening: 1 month6.4 Special precautions for storage
Do not store above 25°C. Store in the original container. Keep the bottle in the outer carton.6.5 Nature and contents of container
Clear glass bottles – 200 ml with polypropylene child resistant closures.6.6 Special precautions for disposal and other handling
Not applicable.
