- Approval Id
- ce4a8bbe3a6e2173
- Drug Approval Emc Name
- Levothyroxine 100 micrograms Tablets
- Drug Name
- Levothyroxine 100 micrograms Tablets
- Company Name
- Glenmark Pharmaceuticals Europe Ltd
- Company Address
- Building 2, Croxley Park, Watford, WD18 8YA
- Company Website
- //www.glenmarkpharma.com
- Company Telephone
- +44 (0)1923 202 950
- Company Medical Info Direct Line
- 0800 458 0383
- Company Stock Availability
- +44 (0)1923 202 950
- Atc Code
- H03AA01
- Legal Category
- Prescription only medicine
- Authorisation Holder
- Glenmark Pharmaceuticals Europe Limited
Laxmi House, 2B Draycott Avenue
Kenton, Middlesex, HA3 0BU
United Kingdom.
- Authorisation Number
- PL 25258/0295
- Authorisation Date
- Date of first authorization: 07/09/2020
- Instruction Authorisation Holder
- Glenmark Pharmaceuticals Europe Limited
Laxmi House, 2B Draycott Avenue
Kenton, Middlesex, HA3 0BU
United Kingdom.
- Instruction Authorisation Number
- PL 25258/0295
- Instruction Authorisation Date
- Date of first authorization: 07/09/2020
- Instruction Composition
- Each tablet contains 100 micrograms Levothyroxine sodium anhydrous.
For the full list of excipients, see section 6.1.
- Instruction Dosage Form
- Tablet
White to off-white, round shaped uncoated tablets approximately 7.00 mm in size debossed with 'G 03´ on one side and plain on the other side.
- Instruction Clinical Particulars
- 4.1 Therapeutic indications
Recommended clinical indications: Control of hypothyroidism, congenital hypothyroidism in infants, acquired hypothyroidism in children and juvenile myxoedema.4.2 Posology and method of administration
Posology
In younger patients, and in the absence of heart disease, a serum Levothyroxine (T4) level of 70 to 160 nanomols per litre, or a serum thyrotrophin level of less than 5 milli-units per litre should be targeted. A pre-therapy ECG is valuable because ECG changes due to hypothyroidism may be confused with ECG evidence of cardiac ischaemia. If too rapid an increase in metabolism is produced (causing diarrhoea, nervousness, rapid pulse, insomnia, tremors, and sometimes anginal pain where there is latent cardiac ischaemia,) dosage must be reduced, or withheld, for a day or two, and then re-started at a lower dose level.
\*\*Adults\*\*
\*Patients under 50 years age:\*
Initially 100 micrograms daily, preferably taken before breakfast or the first meal of the day. Adjust at three to four week intervals by 50 micrograms until normal metabolism is steadily maintained. The final daily dose may be up to 100 to 200 micrograms.
\*Patients over 50 years age:\*
a. \*Without cardiac disease\*: Initially, it is not advisable to exceed 50 micrograms daily. In this condition, the daily dose may be increased by 50 micrograms at intervals of every 3-4 weeks, until stable thyroxine levels are attained. The final daily dose may be up to 50 to 200 micrograms.
b. \*With cardiac disease\*: Where there is cardiac disease, 25 micrograms daily or 50 micrograms on alternate days is more suitable. In this conditions, the daily dose may be increased by 25 micrograms at intervals of every 4 weeks, until stable thyroxine levels are attained. The final daily dose may be up to 50 to 200 micrograms.
For patients aged over 50 years, with or without cardiac disease, clinical response is probably a more acceptable criteria of dosage rather that serum levels.
\*\*Elderly\*\*
Same as that for patients aged over 50 years.
\*\*Paediatric population\*\*
The maintenance dose is generally 100 to 150 micrograms per m² body surface area. The dose for children depends on their age, weight and the condition being treated. Regular monitoring using serum TSH levels, as in adults, is required to make sure he/she gets the right dose. Infants should be given the total daily dose at least half an hour before the first meal of the day.
Congenital hypothyroidism in infants:
For neonates and infants with congenital hypothyroidism, where rapid replacement is important, the initial recommended dosage is 10 to 15 micrograms per kg BW per day for the first 3 months. Thereafter, the dose should be adjusted individually according to the clinical findings and thyroid hormone and TSH values.
Acquired hypothyroidism in children:
For children with acquired hypothyroidism, the initial recommended dosage is 12.5-50 micrograms per day. The dose should be increased gradually every 2 to 4 weeks according to the clinical findings and thyroid hormone and TSH values until the full replacement dose is reached.
Juvenile myxoedema in children:
The initial recommended dosage is 25 micrograms daily. In such conditions, the daily dose may be increased by 25 micrograms at intervals of every 2 - 4 weeks, until mild symptoms of hyperthyroidism is seen. The dose will then be reduced slightly.
In children under 5 years of age, the administration of whole tablets is not recommended. It is also not recommended that tablets are crushed and dispersed in water or other liquids, owing to limited solubility which could lead to dosing inaccuracy. In this age group it is preferable to administer an approved oral solution of levothyroxine.
\*\*Method of administration\*\*
Oral4.3 Contraindications
• Hypersensitivity to the active substance or to any of the excipients listed in section 6.1
• Thyrotoxicosis
• Adrenal gland disorder or adrenal insufficiency
• Treatment with Levothyroxine must not be initiated in acute myocardial infarction, acute myocarditis, and acute pancarditis.
• Combination therapy of hyperthyroidism with levothyroxine and anti-thyroid agents is not indicated in pregnancy. (See section 4.6).4.4 Special warnings and precautions for use
Levothyroxine should be introduced very gradually in patients aged over 50 years (see section 4.2) and those with long standing hypothyroidism to avoid any sudden increase in metabolic demands.
Patients with panhypopituitarism or other causes predisposing to adrenal insufficiency may react to levothyroxine treatment, and it is advisable to start corticosteroid therapy before giving levothyroxine to such patients.
Levothyroxine sodium should be used with caution in patients with cardiovascular disorders, including angina, coronary artery disease, hypertension, and in the elderly who have a greater likelihood of occult cardiac disease.
To minimise the risk of adverse effects of undetected overtreatment, such as atrial fibrillation and fractures associated with low serum levels of thyroid stimulating hormone (TSH) in older patients, it is important to monitor serum TSH and adjust the dose accordingly during long term use.
In individuals suspected to have cardiovascular disease or to be at high risk, it is important to perform an ECG prior to commencement of levothyroxine treatment in order to detect changes consistent with ischaemia in which case, levothyroxine should be initiated at a low dose, followed by cautious dose escalation to avoid worsening of ischaemia or precipitation of an infarct.
Special care is needed for the elderly and for patients with symptoms of myocardial insufficiency, or ECG evidence of myocardial infarction.
Thyroid replacement therapy may cause an increase in dosage requirements of insulin or other anti-diabetic therapy (such as metformin). Care is needed for patients with diabetes mellitus, and diabetes insipidus.
See note above regarding withdrawal of treatment.
Subclinical hyperthyroidism may be associated with bone loss. To minimise the risk of osteoporosis, dosage of levothyroxine sodium should be titrated to the lowest possible effective level.
Parents of children receiving thyroid agent should be advised that partial loss of hair may occur during the first few months of therapy, but this effect is usually transient and subsequent regrowth usually occurs.
Care is required when levothyroxine is administered to patients with known history of epilepsy. Seizures have been reported rarely in association with the initiation of levothyroxine sodium therapy and may be related to the effect of thyroid hormone on seizure threshold.
Haemodynamic parameters should be monitored when levothyroxine therapy is initiated in very low birth weight preterm neonates as circulatory collapse may occur due to the immature adrenal function.
A small number of patients report adverse events on changing between different levothyroxine products. In some cases, symptoms are reported despite thyroid function tests within the reference range. If patients report side effects on switching between products, consider thyroid function testing. For patients who are persistently symptomatic after switching, whether they are biochemically euthyroid or have evidence of abnormal thyroid function, consider consistently prescribing a specific levothyroxine product that is well-tolerated by the patient. If symptoms or poor control of thyroid function persist despite adhering to a specific product, prescription of levothyroxine in an oral solution formulation should be considered.
Thyroid hormones should not be given for weight reduction. In euthyroid patients, treatment with levothyroxine does not cause weight reduction. Substantial doses may cause serious or even life-threatening undesirable effects, particularly in combination with certain substances for weight reduction, and especially with sympathomimetic amines.
\*\*Interferences with laboratory test:\*\*
Biotin may interfere with thyroid immunoassays that are based on a biotin/streptavidin interaction, leading to either falsely decreased or falsely increased test results. The risk of interference increases with higher doses of biotin.
When interpreting results of laboratory tests, possible biotin interference has to be taken into consideration, especially if a lack of coherence with the clinical presentation is observed.
For patients taking biotin-containing products, laboratory personnel should be informed when a thyroid function test is requested. Alternative tests not susceptible to biotin interference should be used, if available. (see section 4.5)
\*\*Excipients\*\*
This medicine contains less than 1 mmol sodium (23 mg) per tablet, that is to say essentially 'sodium-free'.4.5 Interaction with other medicinal products and other forms of interaction
\*Interactions affecting other drugs:\*
Levothyroxine increases the effect of anticoagulants (Warfarin) and it may be necessary to reduce the anticoagulation dosage if excessive, hypoprothrombinaemia and bleeding are to be avoided.
Blood sugar levels are raised and dosage of anti-diabetic agents may require adjustment.
Tricyclic anti-depressants (e.g. amitriptyline, imipramine, dosulepin)response may be accelerated because levothyroxine increases sensitivity to catecholamines; concomitant use may precipitate cardiac arrhythmias.
The effects of sympathomimetic agents (e.g. adrenaline or phenylephrine) are also enhanced
Cardiac glycosides: If levothyroxine therapy is initiated in digitalised patients, the dose of digitalis may require adjustment. Hyperthyroid patients may need their digoxin dosage gradually increased as treatment proceeds because initially patients are relatively sensitive to digoxin.
NSAIDs: False low plasma concentrations have been observed with concurrent anti-inflammatory treatment such as phenylbutazone or acetylsalicylic acid and levothyroxine therapy.
Beta Blockers: levothyroxine (thyroxine) accelerates metabolism of propranolol, atenolol and sotalol.
General anaesthetics: Isolated reports of marked hypertension and tachycardia have been reported with concurrent ketamine administration.
\*Interactions affecting Levothyroxine:\*
Amiodarone may inhibit the de iodination of thyroxine to tri iodothyronine resulting in a decreased concentration of tri iodothyronine, thereby reducing the effects of thyroid hormones.
Anti-convulsants, such as carbamazepine and phenytoin, enhance the metabolism of thyroid hormones and may displace them from plasma proteins.
Initiation or discontinuation of anti-convulsant therapy may alter levothyroxine dosage requirements.
Effects of Levothyroxine may be decreased by concomitant sertraline.
Absorption of levothyroxine (thyroxine) possibly reduced by antacids, calcium salts, cimetidine, oral iron, sucralfate, colestipol, polystyrene sulphonate resin and cholestyramine (administration should be separated by 4-5 hours).
\*\*Proton pump inhibitors (PPIs):\*\*
Co-administration with PPIs may cause a decrease in the absorption of the thyroid hormones, due to the increase of the intragastric pH caused by PPIs.
Regular monitoring of thyroid function and clinical monitoring is recommended during concomitant treatment. It may be necessary to increase the dose of thyroid hormones.
Care should also be taken when treatment with PPI ends.
Metabolism of levothyroxine (thyroxine) is accelerated by rifampicin, barbituarates, products containing St John's Wort (\*Hypericum perforatum L.\*) and primidone.
Therefore, patients on thyroid replacement therapy may require an increase in their dose of thyroid hormone if these products are given concurrently.
Imatinib: plasma concentration of levothyroxine (thyroxine) possibly reduced by imatinib.
Beta blockers may decrease the peripheral conversion of levothyroxine to triiodothyronine.
Lipid regulating drugs: Lovastatin has been reported to cause one case each of hypothyroidism and hyperthyroidism in two patients taking levothyroxine.
Sex Hormones: Oestrogen, oestrogen containing product (including hormone replacement therapy) and oral contraceptives may increase the requirement of thyroid therapy dosage. Conversely, androgens and corticosteroids may decrease serum concentrations of Levothyroxine-binding globulins.
Anti-obesity drugs such as orlistat may decrease levothyroxine absorption which may result in hypothyroidism (monitor for changes in thyroid function).
A number of drugs may affect thyroid function tests and this should be borne in mind when monitoring a patient on levothyroxine therapy.
Post-marketing cases have been reported indicating a potential interaction between ritonavir containing products and levothyroxine. Thyroid- stimulating hormone (TSH) should be monitored in patients treated with levothyroxine at least the first month after starting and /or ending ritonavir treatment.
\*\*Interferences with laboratory test:\*\*
Biotin may interfere with thyroid immunoassays that are based on a biotin/streptavidin interaction, leading to either falsely decreased or falsely increased test results (see section 4.4).4.6 Fertility, pregnancy and lactation
\*\*Pregnancy\*\*
The safety of Levothyroxine treatment during pregnancy is not known, but any possible risk of foetal abnormalities should be weighed against the risk to the foetus of untreated hypothyroidism.
Combination therapy of hyperthyroidism with levothyroxine and anti-thyroid agents is not indicated in pregnancy. Such combination would require higher doses of anti-thyroid agents, which are known to pass the placenta and to induce hypothyroidism in the infant.
\*\*Breast-feeding\*\*
Levothyroxine is excreted in breast milk in low concentrations, and it is contentious whether this can interfere with neonatal screening.
\*\*Fertility\*\*
No data available4.7 Effects on ability to drive and use machines
Levothyroxine has no or negligible influence on the ability to drive and use machines.4.8 Undesirable effects
Side-effects are usually indicative of excessive dosage and usually disappear on reduction of dosage or withdrawal of treatment for a few days. Adverse reactions listed below have been observed during clinical studies and/or during marketed use and are based on clinical trial data and classified according to MedDRA System Organ Class. Frequency categories are defined according to the following convention:
Not known (cannot be estimated from the available data)
| | |
| --- | --- |
| \*\*System organ class\*\* | \*\*Undesirable effects\*\* |
| Immune system disorders | Hypersensitivity reaction, |
| Endocrine disorders | Thyrotoxic crisis1 |
| Psychiatric disorders | Restlessness, agitation, insomnia |
| Nervous system disorders | Tremor |
| Cardiac disorders | Angina pectoris, arrhythmia, palpitations, tachycardia |
| Vascular disorders | Flushing |
| Respiratory, thoracic and mediastinal disorders | Dyspnoea |
| Gastrointestinal disorders | Diarrhoea, vomiting |
| Skin and subcutaneous tissue disorders | Hyperhidrosis, alopecia, rash, pruritus |
| Musculoskeletal and connective tissue disorder | Arthralgia, muscle spasm, muscular weakness |
| Reproductive system and breast disorders | Menstruation irregular |
| General disorders and administration site conditions | Headache, pyrexia, malaise, oedema |
| Investigations | Weight decreased |
1Some patients may experience a severe reaction to high levels of thyroid hormone. This is called a "thyroid crisis" with any of the following symptoms: Hyperpyrexia, tachycardia, arrhythmia, hypotension, cardiac failure, jaundice, confusion, seizure and coma
\*\*Paediatric population\*\*
Heat intolerance, transient hair loss, benign intracranial hypertension, craniostenosis in infants and premature closure of epiphysis in children.
\*\*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.co.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.4.9 Overdose
\*\*Symptoms\*\*
In most cases there will be no features. Signs of an overdose may include: fever, chest pain (angina), racing or irregular heartbeat, muscle cramps, headache, restlessness, flushing, sweating, diarrhoea, tremor, insomnia and hyperpyrexia. These signs can take up to 5 days to appear. Atrial fibrillation may develop. Convulsions occurred in one child. There may be increased toxicity in those with pre-existing heart disease.
\*\*Management\*\*
Give oral activated charcoal if more than 10mg has been ingested by an adult or more than 5mg by a child, within 1 hour. If more than 10mg has been ingested by an adult or more than 5mg by a child, take blood 6-12 hours after ingestion for measurement of the free thyroxine concentration. The analysis does not need to be done urgently but can wait until the first working day after the incident. Patients with normal free thyroxine concentrations do not require follow up. Those with high concentrations should have outpatient review 3-6 days after ingestion to detect delayed onset hyperthyroidism. Features of clinical hyperthyroidism should be controlled with beta-blockers, e.g. propranolol.
- Instruction Pharmacology
- 5.1 Pharmacodynamic properties
Pharmacotherapeutic group: Thyroid hormones, ATC Code: H03AA01
\*\*Mechanism of action\*\*
Levothyroxine 100 microgram is a tablet containing the hydrated form of Levothyroxine sodium which is used for the treatment of hypothyroidism. The thyroid gland is dependent upon 2 active principles for its main hormone activity these are Levothyroxine (tetraiodothyronine) and Tri-iodothyronine (see Goodman and Gilman, 1985). These closely related iodine containing amino acids are incorporated into the glycoprotein thyroglobulin. The chief action of these hormones is to increase the rate of cell metabolism. Levothyroxine is deiodinated in peripheral tissues to form triiodothyronine which is thought to be the active tissue form of thyroid hormone.
\*\*Pharmacodynamic effects\*\*
Tri-iodothyronine is certainly more rapid acting and has a shorter duration of action than Levothyroxine.
The chief action of Levothyroxine is to increase the rate of cell metabolism5.2 Pharmacokinetic properties
\*\*Absorption\*\*
Levothyroxine sodium is incompletely and variably absorbed from the gastrointestinal tract.
\*\*Distribution\*\*
It is almost completely bound to plasma proteins and has a half-life in the circulation of about a week in healthy subjects, but longer during pregnancy in patients with myxoedema.
\*\*Biotransformation\*\*
A large portion of the Levothyroxine leaving the circulation is taken up by the liver. Part of a dose of Levothyroxine is metabolised to triiodothyronine.
\*\*Elimination\*\*
Levothyroxine is excreted in the urine as free drug, deiodinated metabolites and conjugates. Some Levothyroxine is excreted in the faeces. There is limited placental transfer of Levothyroxine.5.3 Preclinical safety data
No further data of relevance.
- Instruction Pharmaceutical Particulars
- 6.1 List of excipients
Cellulose microcrystalline (Ceolus UF 711) (E460),
Croscarmellose Sodium,
Light Magnesium Oxide (E530),
Sodium Stearyl Fumarate.6.2 Incompatibilities
None known6.3 Shelf life
Bottle Pack: 24 months
Blister Pack: 18 months6.4 Special precautions for storage
Bottle Pack: Do not store above 30° C
Blister Pack: Do not store above 25° C
Store in the original package in order to protect from light and moisture.6.5 Nature and contents of container
Blister Pack:
Aluminium - Aluminium blisters
Pack sizes: 28, 30, 50, 56, 60, 84, 100 and 112 tablets
Bottle Pack:
HDPE bottles with oxygen absorbing canister; sealed with polypropylene child resistant screw cap and heat seal linear.
Pack sizes: 28, 56, 100, 112 and 1000 tablets
Not all pack sizes may be marketed.6.6 Special precautions for disposal and other handling
No special requirements.
- Instruction Content
- ## Composition
Each tablet contains 100 micrograms Levothyroxine sodium anhydrous.
For the full list of excipients, see section 6.1.
## Pharmaceutical Form
Tablet
White to off-white, round shaped uncoated tablets approximately 7.00 mm in size debossed with 'G 03´ on one side and plain on the other side.
## Clinical Particulars
4.1 Therapeutic indications
Recommended clinical indications: Control of hypothyroidism, congenital hypothyroidism in infants, acquired hypothyroidism in children and juvenile myxoedema.4.2 Posology and method of administration
Posology
In younger patients, and in the absence of heart disease, a serum Levothyroxine (T4) level of 70 to 160 nanomols per litre, or a serum thyrotrophin level of less than 5 milli-units per litre should be targeted. A pre-therapy ECG is valuable because ECG changes due to hypothyroidism may be confused with ECG evidence of cardiac ischaemia. If too rapid an increase in metabolism is produced (causing diarrhoea, nervousness, rapid pulse, insomnia, tremors, and sometimes anginal pain where there is latent cardiac ischaemia,) dosage must be reduced, or withheld, for a day or two, and then re-started at a lower dose level.
\*\*Adults\*\*
\*Patients under 50 years age:\*
Initially 100 micrograms daily, preferably taken before breakfast or the first meal of the day. Adjust at three to four week intervals by 50 micrograms until normal metabolism is steadily maintained. The final daily dose may be up to 100 to 200 micrograms.
\*Patients over 50 years age:\*
a. \*Without cardiac disease\*: Initially, it is not advisable to exceed 50 micrograms daily. In this condition, the daily dose may be increased by 50 micrograms at intervals of every 3-4 weeks, until stable thyroxine levels are attained. The final daily dose may be up to 50 to 200 micrograms.
b. \*With cardiac disease\*: Where there is cardiac disease, 25 micrograms daily or 50 micrograms on alternate days is more suitable. In this conditions, the daily dose may be increased by 25 micrograms at intervals of every 4 weeks, until stable thyroxine levels are attained. The final daily dose may be up to 50 to 200 micrograms.
For patients aged over 50 years, with or without cardiac disease, clinical response is probably a more acceptable criteria of dosage rather that serum levels.
\*\*Elderly\*\*
Same as that for patients aged over 50 years.
\*\*Paediatric population\*\*
The maintenance dose is generally 100 to 150 micrograms per m² body surface area. The dose for children depends on their age, weight and the condition being treated. Regular monitoring using serum TSH levels, as in adults, is required to make sure he/she gets the right dose. Infants should be given the total daily dose at least half an hour before the first meal of the day.
Congenital hypothyroidism in infants:
For neonates and infants with congenital hypothyroidism, where rapid replacement is important, the initial recommended dosage is 10 to 15 micrograms per kg BW per day for the first 3 months. Thereafter, the dose should be adjusted individually according to the clinical findings and thyroid hormone and TSH values.
Acquired hypothyroidism in children:
For children with acquired hypothyroidism, the initial recommended dosage is 12.5-50 micrograms per day. The dose should be increased gradually every 2 to 4 weeks according to the clinical findings and thyroid hormone and TSH values until the full replacement dose is reached.
Juvenile myxoedema in children:
The initial recommended dosage is 25 micrograms daily. In such conditions, the daily dose may be increased by 25 micrograms at intervals of every 2 - 4 weeks, until mild symptoms of hyperthyroidism is seen. The dose will then be reduced slightly.
In children under 5 years of age, the administration of whole tablets is not recommended. It is also not recommended that tablets are crushed and dispersed in water or other liquids, owing to limited solubility which could lead to dosing inaccuracy. In this age group it is preferable to administer an approved oral solution of levothyroxine.
\*\*Method of administration\*\*
Oral4.3 Contraindications
• Hypersensitivity to the active substance or to any of the excipients listed in section 6.1
• Thyrotoxicosis
• Adrenal gland disorder or adrenal insufficiency
• Treatment with Levothyroxine must not be initiated in acute myocardial infarction, acute myocarditis, and acute pancarditis.
• Combination therapy of hyperthyroidism with levothyroxine and anti-thyroid agents is not indicated in pregnancy. (See section 4.6).4.4 Special warnings and precautions for use
Levothyroxine should be introduced very gradually in patients aged over 50 years (see section 4.2) and those with long standing hypothyroidism to avoid any sudden increase in metabolic demands.
Patients with panhypopituitarism or other causes predisposing to adrenal insufficiency may react to levothyroxine treatment, and it is advisable to start corticosteroid therapy before giving levothyroxine to such patients.
Levothyroxine sodium should be used with caution in patients with cardiovascular disorders, including angina, coronary artery disease, hypertension, and in the elderly who have a greater likelihood of occult cardiac disease.
To minimise the risk of adverse effects of undetected overtreatment, such as atrial fibrillation and fractures associated with low serum levels of thyroid stimulating hormone (TSH) in older patients, it is important to monitor serum TSH and adjust the dose accordingly during long term use.
In individuals suspected to have cardiovascular disease or to be at high risk, it is important to perform an ECG prior to commencement of levothyroxine treatment in order to detect changes consistent with ischaemia in which case, levothyroxine should be initiated at a low dose, followed by cautious dose escalation to avoid worsening of ischaemia or precipitation of an infarct.
Special care is needed for the elderly and for patients with symptoms of myocardial insufficiency, or ECG evidence of myocardial infarction.
Thyroid replacement therapy may cause an increase in dosage requirements of insulin or other anti-diabetic therapy (such as metformin). Care is needed for patients with diabetes mellitus, and diabetes insipidus.
See note above regarding withdrawal of treatment.
Subclinical hyperthyroidism may be associated with bone loss. To minimise the risk of osteoporosis, dosage of levothyroxine sodium should be titrated to the lowest possible effective level.
Parents of children receiving thyroid agent should be advised that partial loss of hair may occur during the first few months of therapy, but this effect is usually transient and subsequent regrowth usually occurs.
Care is required when levothyroxine is administered to patients with known history of epilepsy. Seizures have been reported rarely in association with the initiation of levothyroxine sodium therapy and may be related to the effect of thyroid hormone on seizure threshold.
Haemodynamic parameters should be monitored when levothyroxine therapy is initiated in very low birth weight preterm neonates as circulatory collapse may occur due to the immature adrenal function.
A small number of patients report adverse events on changing between different levothyroxine products. In some cases, symptoms are reported despite thyroid function tests within the reference range. If patients report side effects on switching between products, consider thyroid function testing. For patients who are persistently symptomatic after switching, whether they are biochemically euthyroid or have evidence of abnormal thyroid function, consider consistently prescribing a specific levothyroxine product that is well-tolerated by the patient. If symptoms or poor control of thyroid function persist despite adhering to a specific product, prescription of levothyroxine in an oral solution formulation should be considered.
Thyroid hormones should not be given for weight reduction. In euthyroid patients, treatment with levothyroxine does not cause weight reduction. Substantial doses may cause serious or even life-threatening undesirable effects, particularly in combination with certain substances for weight reduction, and especially with sympathomimetic amines.
\*\*Interferences with laboratory test:\*\*
Biotin may interfere with thyroid immunoassays that are based on a biotin/streptavidin interaction, leading to either falsely decreased or falsely increased test results. The risk of interference increases with higher doses of biotin.
When interpreting results of laboratory tests, possible biotin interference has to be taken into consideration, especially if a lack of coherence with the clinical presentation is observed.
For patients taking biotin-containing products, laboratory personnel should be informed when a thyroid function test is requested. Alternative tests not susceptible to biotin interference should be used, if available. (see section 4.5)
\*\*Excipients\*\*
This medicine contains less than 1 mmol sodium (23 mg) per tablet, that is to say essentially 'sodium-free'.4.5 Interaction with other medicinal products and other forms of interaction
\*Interactions affecting other drugs:\*
Levothyroxine increases the effect of anticoagulants (Warfarin) and it may be necessary to reduce the anticoagulation dosage if excessive, hypoprothrombinaemia and bleeding are to be avoided.
Blood sugar levels are raised and dosage of anti-diabetic agents may require adjustment.
Tricyclic anti-depressants (e.g. amitriptyline, imipramine, dosulepin)response may be accelerated because levothyroxine increases sensitivity to catecholamines; concomitant use may precipitate cardiac arrhythmias.
The effects of sympathomimetic agents (e.g. adrenaline or phenylephrine) are also enhanced
Cardiac glycosides: If levothyroxine therapy is initiated in digitalised patients, the dose of digitalis may require adjustment. Hyperthyroid patients may need their digoxin dosage gradually increased as treatment proceeds because initially patients are relatively sensitive to digoxin.
NSAIDs: False low plasma concentrations have been observed with concurrent anti-inflammatory treatment such as phenylbutazone or acetylsalicylic acid and levothyroxine therapy.
Beta Blockers: levothyroxine (thyroxine) accelerates metabolism of propranolol, atenolol and sotalol.
General anaesthetics: Isolated reports of marked hypertension and tachycardia have been reported with concurrent ketamine administration.
\*Interactions affecting Levothyroxine:\*
Amiodarone may inhibit the de iodination of thyroxine to tri iodothyronine resulting in a decreased concentration of tri iodothyronine, thereby reducing the effects of thyroid hormones.
Anti-convulsants, such as carbamazepine and phenytoin, enhance the metabolism of thyroid hormones and may displace them from plasma proteins.
Initiation or discontinuation of anti-convulsant therapy may alter levothyroxine dosage requirements.
Effects of Levothyroxine may be decreased by concomitant sertraline.
Absorption of levothyroxine (thyroxine) possibly reduced by antacids, calcium salts, cimetidine, oral iron, sucralfate, colestipol, polystyrene sulphonate resin and cholestyramine (administration should be separated by 4-5 hours).
\*\*Proton pump inhibitors (PPIs):\*\*
Co-administration with PPIs may cause a decrease in the absorption of the thyroid hormones, due to the increase of the intragastric pH caused by PPIs.
Regular monitoring of thyroid function and clinical monitoring is recommended during concomitant treatment. It may be necessary to increase the dose of thyroid hormones.
Care should also be taken when treatment with PPI ends.
Metabolism of levothyroxine (thyroxine) is accelerated by rifampicin, barbituarates, products containing St John's Wort (\*Hypericum perforatum L.\*) and primidone.
Therefore, patients on thyroid replacement therapy may require an increase in their dose of thyroid hormone if these products are given concurrently.
Imatinib: plasma concentration of levothyroxine (thyroxine) possibly reduced by imatinib.
Beta blockers may decrease the peripheral conversion of levothyroxine to triiodothyronine.
Lipid regulating drugs: Lovastatin has been reported to cause one case each of hypothyroidism and hyperthyroidism in two patients taking levothyroxine.
Sex Hormones: Oestrogen, oestrogen containing product (including hormone replacement therapy) and oral contraceptives may increase the requirement of thyroid therapy dosage. Conversely, androgens and corticosteroids may decrease serum concentrations of Levothyroxine-binding globulins.
Anti-obesity drugs such as orlistat may decrease levothyroxine absorption which may result in hypothyroidism (monitor for changes in thyroid function).
A number of drugs may affect thyroid function tests and this should be borne in mind when monitoring a patient on levothyroxine therapy.
Post-marketing cases have been reported indicating a potential interaction between ritonavir containing products and levothyroxine. Thyroid- stimulating hormone (TSH) should be monitored in patients treated with levothyroxine at least the first month after starting and /or ending ritonavir treatment.
\*\*Interferences with laboratory test:\*\*
Biotin may interfere with thyroid immunoassays that are based on a biotin/streptavidin interaction, leading to either falsely decreased or falsely increased test results (see section 4.4).4.6 Fertility, pregnancy and lactation
\*\*Pregnancy\*\*
The safety of Levothyroxine treatment during pregnancy is not known, but any possible risk of foetal abnormalities should be weighed against the risk to the foetus of untreated hypothyroidism.
Combination therapy of hyperthyroidism with levothyroxine and anti-thyroid agents is not indicated in pregnancy. Such combination would require higher doses of anti-thyroid agents, which are known to pass the placenta and to induce hypothyroidism in the infant.
\*\*Breast-feeding\*\*
Levothyroxine is excreted in breast milk in low concentrations, and it is contentious whether this can interfere with neonatal screening.
\*\*Fertility\*\*
No data available4.7 Effects on ability to drive and use machines
Levothyroxine has no or negligible influence on the ability to drive and use machines.4.8 Undesirable effects
Side-effects are usually indicative of excessive dosage and usually disappear on reduction of dosage or withdrawal of treatment for a few days. Adverse reactions listed below have been observed during clinical studies and/or during marketed use and are based on clinical trial data and classified according to MedDRA System Organ Class. Frequency categories are defined according to the following convention:
Not known (cannot be estimated from the available data)
| | |
| --- | --- |
| \*\*System organ class\*\* | \*\*Undesirable effects\*\* |
| Immune system disorders | Hypersensitivity reaction, |
| Endocrine disorders | Thyrotoxic crisis1 |
| Psychiatric disorders | Restlessness, agitation, insomnia |
| Nervous system disorders | Tremor |
| Cardiac disorders | Angina pectoris, arrhythmia, palpitations, tachycardia |
| Vascular disorders | Flushing |
| Respiratory, thoracic and mediastinal disorders | Dyspnoea |
| Gastrointestinal disorders | Diarrhoea, vomiting |
| Skin and subcutaneous tissue disorders | Hyperhidrosis, alopecia, rash, pruritus |
| Musculoskeletal and connective tissue disorder | Arthralgia, muscle spasm, muscular weakness |
| Reproductive system and breast disorders | Menstruation irregular |
| General disorders and administration site conditions | Headache, pyrexia, malaise, oedema |
| Investigations | Weight decreased |
1Some patients may experience a severe reaction to high levels of thyroid hormone. This is called a "thyroid crisis" with any of the following symptoms: Hyperpyrexia, tachycardia, arrhythmia, hypotension, cardiac failure, jaundice, confusion, seizure and coma
\*\*Paediatric population\*\*
Heat intolerance, transient hair loss, benign intracranial hypertension, craniostenosis in infants and premature closure of epiphysis in children.
\*\*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.co.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.4.9 Overdose
\*\*Symptoms\*\*
In most cases there will be no features. Signs of an overdose may include: fever, chest pain (angina), racing or irregular heartbeat, muscle cramps, headache, restlessness, flushing, sweating, diarrhoea, tremor, insomnia and hyperpyrexia. These signs can take up to 5 days to appear. Atrial fibrillation may develop. Convulsions occurred in one child. There may be increased toxicity in those with pre-existing heart disease.
\*\*Management\*\*
Give oral activated charcoal if more than 10mg has been ingested by an adult or more than 5mg by a child, within 1 hour. If more than 10mg has been ingested by an adult or more than 5mg by a child, take blood 6-12 hours after ingestion for measurement of the free thyroxine concentration. The analysis does not need to be done urgently but can wait until the first working day after the incident. Patients with normal free thyroxine concentrations do not require follow up. Those with high concentrations should have outpatient review 3-6 days after ingestion to detect delayed onset hyperthyroidism. Features of clinical hyperthyroidism should be controlled with beta-blockers, e.g. propranolol.
## Pharmacological Properties
5.1 Pharmacodynamic properties
Pharmacotherapeutic group: Thyroid hormones, ATC Code: H03AA01
\*\*Mechanism of action\*\*
Levothyroxine 100 microgram is a tablet containing the hydrated form of Levothyroxine sodium which is used for the treatment of hypothyroidism. The thyroid gland is dependent upon 2 active principles for its main hormone activity these are Levothyroxine (tetraiodothyronine) and Tri-iodothyronine (see Goodman and Gilman, 1985). These closely related iodine containing amino acids are incorporated into the glycoprotein thyroglobulin. The chief action of these hormones is to increase the rate of cell metabolism. Levothyroxine is deiodinated in peripheral tissues to form triiodothyronine which is thought to be the active tissue form of thyroid hormone.
\*\*Pharmacodynamic effects\*\*
Tri-iodothyronine is certainly more rapid acting and has a shorter duration of action than Levothyroxine.
The chief action of Levothyroxine is to increase the rate of cell metabolism5.2 Pharmacokinetic properties
\*\*Absorption\*\*
Levothyroxine sodium is incompletely and variably absorbed from the gastrointestinal tract.
\*\*Distribution\*\*
It is almost completely bound to plasma proteins and has a half-life in the circulation of about a week in healthy subjects, but longer during pregnancy in patients with myxoedema.
\*\*Biotransformation\*\*
A large portion of the Levothyroxine leaving the circulation is taken up by the liver. Part of a dose of Levothyroxine is metabolised to triiodothyronine.
\*\*Elimination\*\*
Levothyroxine is excreted in the urine as free drug, deiodinated metabolites and conjugates. Some Levothyroxine is excreted in the faeces. There is limited placental transfer of Levothyroxine.5.3 Preclinical safety data
No further data of relevance.
## Pharmaceutical Particulars
6.1 List of excipients
Cellulose microcrystalline (Ceolus UF 711) (E460),
Croscarmellose Sodium,
Light Magnesium Oxide (E530),
Sodium Stearyl Fumarate.6.2 Incompatibilities
None known6.3 Shelf life
Bottle Pack: 24 months
Blister Pack: 18 months6.4 Special precautions for storage
Bottle Pack: Do not store above 30° C
Blister Pack: Do not store above 25° C
Store in the original package in order to protect from light and moisture.6.5 Nature and contents of container
Blister Pack:
Aluminium - Aluminium blisters
Pack sizes: 28, 30, 50, 56, 60, 84, 100 and 112 tablets
Bottle Pack:
HDPE bottles with oxygen absorbing canister; sealed with polypropylene child resistant screw cap and heat seal linear.
Pack sizes: 28, 56, 100, 112 and 1000 tablets
Not all pack sizes may be marketed.6.6 Special precautions for disposal and other handling
No special requirements.
