1 INDICATIONS AND USAGE

Adult Patients:

ISENTRESS® and ISENTRESS® HD are indicated in combination with other antiretroviral agents for the treatment of human immunodeficiency virus (HIV-1) infection in adult patients.

Pediatric Patients:

ISENTRESS is indicated in combination with other antiretroviral agents for the treatment of HIV-1 infection in pediatric patients weighing at least 2 kg.

ISENTRESS HD is indicated in combination with other antiretroviral agents for the treatment of HIV-1 infection in pediatric patients weighing at least 40 kg.

5 WARNINGS AND PRECAUTIONS

5.1 Severe Skin and Hypersensitivity Reactions

Severe, potentially life-threatening, and fatal skin reactions have been reported. These include cases of Stevens-Johnson syndrome and toxic epidermal necrolysis. Hypersensitivity reactions have also been reported and were characterized by rash, constitutional findings, and sometimes, organ dysfunction, including hepatic failure. Discontinue ISENTRESS or ISENTRESS HD and other suspect agents immediately if signs or symptoms of severe skin reactions or hypersensitivity reactions develop (including, but not limited to, severe rash or rash accompanied by fever, general malaise, fatigue, muscle or joint aches, blisters, oral lesions, conjunctivitis, facial edema, hepatitis, eosinophilia, angioedema). Clinical status including liver aminotransferases should be monitored and appropriate therapy initiated. Delay in stopping ISENTRESS or ISENTRESS HD treatment or other suspect agents after the onset of severe rash may result in a life-threatening reaction.

5.2 Immune Reconstitution Syndrome

Immune reconstitution syndrome has been reported in patients treated with combination antiretroviral therapy, including ISENTRESS. During the initial phase of combination antiretroviral treatment, patients whose immune systems respond may develop an inflammatory response to indolent or residual opportunistic infections (such as Mycobacterium avium infection, cytomegalovirus, Pneumocystis jiroveci pneumonia, tuberculosis), which may necessitate further evaluation and treatment.

Autoimmune disorders (such as Graves' disease, polymyositis, and Guillain- Barré syndrome) have also been reported to occur in the setting of immune reconstitution; however, the time to onset is more variable, and can occur many months after initiation of treatment.

5.3 Phenylketonurics

ISENTRESS Chewable Tablets contain phenylalanine, a component of aspartame. Each 25 mg ISENTRESS Chewable Tablet contains approximately 0.05 mg phenylalanine. Each 100 mg ISENTRESS Chewable Tablet contains approximately 0.10 mg phenylalanine. Phenylalanine can be harmful to patients with phenylketonuria.

11 DESCRIPTION

ISENTRESS contains raltegravir potassium, a human immunodeficiency virus integrase strand transfer inhibitor. The chemical name for raltegravir potassium is N-[(4-Fluorophenyl) methyl]-1,6-dihydro-5-hydroxy-1-methyl-2-[1-methyl-1-[[(5-methyl-1,3,4-oxadiazol-2-yl)carbonyl]amino]ethyl]-6-oxo-4-pyrimidinecarboxamide monopotassium salt.

The empirical formula is C20H20FKN6O5 and the molecular weight is 482.51. The structural formula is:

Raltegravir potassium is a white to off-white powder. It is soluble in water, slightly soluble in methanol, very slightly soluble in ethanol and acetonitrile and insoluble in isopropanol.

Each 400 mg film-coated tablet of ISENTRESS for oral administration contains 434.4 mg of raltegravir (as potassium salt), equivalent to 400 mg of raltegravir free phenol and the following inactive ingredients: calcium phosphate dibasic anhydrous, hypromellose 2208, lactose monohydrate, magnesium stearate, microcrystalline cellulose, poloxamer 407 (contains 0.01% butylated hydroxytoluene as antioxidant), sodium stearyl fumarate. In addition, the film coating contains the following inactive ingredients: black iron oxide, polyethylene glycol 3350, polyvinyl alcohol, red iron oxide, talc and titanium dioxide.

Each 600 mg film-coated tablet of ISENTRESS HD for oral administration contains 651.6 mg of raltegravir (as potassium salt), equivalent to 600 mg of raltegravir free phenol and the following inactive ingredients: croscarmellose sodium, hypromellose 2910, magnesium stearate, microcrystalline cellulose. The film coating contains the following inactive ingredients: ferrosoferric oxide, hypromellose 2910, iron oxide yellow, lactose monohydrate, triacetin and titanium dioxide. The tablet may also contain trace amount of carnauba wax.

Each 100 mg chewable tablet of ISENTRESS for oral administration contains 108.6 mg of raltegravir (as potassium salt), equivalent to 100 mg of raltegravir free phenol and the following inactive ingredients: ammonium hydroxide, crospovidone, ethylcellulose 20 cP, fructose, hydroxypropyl cellulose, hypromellose 2910/6cP, magnesium stearate, mannitol, medium chain triglycerides, monoammonium glycyrrhizinate, natural and artificial flavors (orange, banana, and masking that contains aspartame), oleic acid, PEG 400, red iron oxide, saccharin sodium, sodium citrate dihydrate, sodium stearyl fumarate, sorbitol, sucralose and yellow iron oxide.

Each 25 mg chewable tablet of ISENTRESS for oral administration contains 27.16 mg of raltegravir (as potassium salt), equivalent to 25 mg of raltegravir free phenol and the following inactive ingredients: ammonium hydroxide, crospovidone, ethylcellulose 20 cP, fructose, hydroxypropyl cellulose, hypromellose 2910/6cP, magnesium stearate, mannitol, medium chain triglycerides, monoammonium glycyrrhizinate, natural and artificial flavors (orange, banana, and masking that contains aspartame), oleic acid, PEG 400, saccharin sodium, sodium citrate dihydrate, sodium stearyl fumarate, sorbitol, sucralose and yellow iron oxide.

Each packet of ISENTRESS for oral suspension 100 mg, contains 108.6 mg of raltegravir (as potassium salt), equivalent to 100 mg of raltegravir free phenol and the following inactive ingredients: ammonium hydroxide, banana with other natural flavors, carboxymethylcellulose sodium, crospovidone, ethylcellulose 20 cP, fructose, hydroxypropyl cellulose, hypromellose 2910/6cP, macrogol/PEG 400, magnesium stearate, maltodextrin, mannitol, medium chain triglycerides, microcrystalline cellulose, monoammonium glycyrrhizinate, oleic acid, sorbitol, sucralose and sucrose.

13 NONCLINICAL TOXICOLOGY

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

Carcinogenicity studies of raltegravir in mice did not show any carcinogenic potential. At the highest dose levels, 400 mg/kg/day in females and 250 mg/kg/day in males, systemic exposure was 1.8-fold (females) or 1.2-fold (males) greater than the AUC (54 µM∙hr) at the 400-mg twice daily human dose. Treatment-related squamous cell carcinoma of nose/nasopharynx was observed in female rats dosed with 600 mg/kg/day raltegravir for 104 weeks. These tumors were possibly the result of local irritation and inflammation due to local deposition and/or aspiration of drug in the mucosa of the nose/nasopharynx during dosing. No tumors of the nose/nasopharynx were observed in rats dosed with 150 mg/kg/day (males) and 50 mg/kg/day (females) and the systemic exposure in rats was 1.7-fold (males) to 1.4-fold (females) greater than the AUC (54 µM∙hr) at the 400-mg twice daily human dose.

No evidence of mutagenicity or genotoxicity was observed in in vitro microbial mutagenesis (Ames) tests, in vitro alkaline elution assays for DNA breakage, and in vitro and in vivo chromosomal aberration studies.

No effect on fertility was seen in male and female rats at doses up to 600 mg/kg/day which resulted in a 3-fold exposure above the exposure at the recommended human dose.

17 PATIENT COUNSELING INFORMATION

Advise patients to read the FDA-approved patient labeling (Patient Information and Instructions for Use).

Severe and Potentially Life-threatening Rash

Inform patients that severe and potentially life-threatening rash has been reported. Advise patients to immediately contact their healthcare provider if they develop rash. Instruct patients to immediately stop taking ISENTRESS or ISENTRESS HD and other suspect agents, and seek medical attention if they develop a rash associated with any of the following symptoms as it may be a sign of a more serious reaction such as Stevens-Johnson syndrome, toxic epidermal necrolysis or severe hypersensitivity: fever, generally ill feeling, extreme tiredness, muscle or joint aches, blisters, oral lesions, eye inflammation, facial swelling, swelling of the eyes, lips, mouth, breathing difficulty, and/or signs and symptoms of liver problems (e.g., yellowing of the skin or whites of the eyes, dark or tea colored urine, pale colored stools/bowel movements, nausea, vomiting, loss of appetite, or pain, aching or sensitivity on the right side below the ribs). Inform patients that if severe rash occurs, their physician will closely monitor them, order laboratory tests and initiate appropriate therapy.

Immune Reconstitution Syndrome

Advise patients to inform their healthcare provider immediately of any symptoms of infection, as in some patients with advanced HIV infection (AIDS), signs and symptoms of inflammation from previous infections may occur soon after anti-HIV treatment is started [see Warnings and Precautions (5.2)].

Rhabdomyolysis

Before patients begin ISENTRESS or ISENTRESS HD, ask them if they have a history of rhabdomyolysis, myopathy or increased creatine kinase or if they are taking medications known to cause these conditions such as statins, fenofibrate, gemfibrozil or zidovudine [see Adverse Reactions (6.1)].

Instruct patients to immediately report to their healthcare provider any unexplained muscle pain, tenderness, or weakness while taking ISENTRESS.

Phenylketonuria

Alert patients with phenylketonuria that ISENTRESS Chewable Tablets contain phenylalanine [see Warnings and Precautions (5.3)].

Drug Interactions

Inform patients that ISENTRESS or ISENTRESS HD may interact with some drugs and ask them to identify all their current medications including over-the- counter agents [see Drug Interactions (7.2)].

Missed Dosage

Inform patients that it is important to take ISENTRESS or ISENTRESS HD on a regular dosing schedule as instructed by their healthcare provider and to avoid missing doses as it can result in development of resistance [see Dosage and Administration (2)].

Important Administration Instructions

Film-Coated Tablets

Inform patients that the film-coated tablets must be swallowed whole.

Oral Suspension

Instruct parents and/or caregivers to read the Instructions for Use before preparing and administering ISENTRESS for oral suspension to pediatric patients. Instruct parents and/or caregivers that ISENTRESS for oral suspension should be administered within 30 minutes of mixing.

Chewable Tablets

Inform parents and/or caregivers that the chewable tablets can be chewed or swallowed whole. Additionally, the 25 mg chewable tablet may be crushed. Instruct parents and/or caregivers that ISENTRESS 25 mg chewable tablets, if crushed, should be administered immediately [see Dosage and Administration (2.1)].

Pregnancy Registry

Advise patients that there is a pregnancy exposure registry that monitors pregnancy outcomes in women exposed to ISENTRESS or ISENTRESS HD during pregnancy [see Use in Specific Populations (8.1)].

Lactation

Instruct women with HIV-1 infection not to breastfeed because HIV-1 can be passed to the baby in the breast milk [see Use in Specific Populations (8.2)].

2 DOSAGE AND ADMINISTRATION

2.1 General Dosing Recommendations

• Because the formulations have different pharmacokinetic profiles, do not substitute ISENTRESS chewable tablets or ISENTRESS for oral suspension for the ISENTRESS 400 mg film-coated tablet or the ISENTRESS HD 600 mg film-coated tablet. See specific dosing guidance for chewable tablets and the formulation for oral suspension.
• Because the extent to which ISENTRESS may be dialyzable is unknown, dosing before a dialysis session should be avoided [see Clinical Pharmacology (12.3)].
• ISENTRESS film-coated tablets must be swallowed whole.
• ISENTRESS chewable tablets may be chewed or swallowed whole. Maximum daily dose is 300 mg taken by mouth twice daily.
• For children who have difficulty chewing the 25 mg chewable tablet, the tablet may be crushed.
  • Preparation of the crushed 25 mg chewable tablet:
    • Place the tablet(s) in a small, clean cup. For each tablet, add a teaspoonful (~5 mL) of liquid (for example, water, juice, or breast milk).
    • Within 2 minutes, the tablet(s) will absorb the liquid and fall apart.
    • Using a spoon, crush any remaining pieces of the tablet(s). Immediately administer the entire dose orally.
    • If any portion of the dose is left in the cup, add another teaspoonful (~5 mL) of liquid, swirl and administer immediately.
• ISENTRESS for oral suspension:
  • SeeInstructions for Use for details on preparation and administration of ISENTRESS for oral suspension.
  • Using the provided mixing cup, combine 10 mL of water and the entire contents of one packet of ISENTRESS for oral suspension and mix. Each single-use packet for oral suspension contains 100 mg of raltegravir which is suspended in 10 mL of water giving a final concentration of 10 mg per mL. Maximum daily dose is 100 mg taken by mouth twice daily.
  • Gently swirl the mixing cup for 45 seconds in a circular motion to mix the powder into a uniform suspension.Do not shake.
  • Once mixed, measure the prescribed dose volume of suspension with a syringe and administer the dose orally. The dose should be administered orally within 30 minutes of mixing.
  • Discard any remaining suspension into the trash.

2.2 Adults

The recommended adult dosage of ISENTRESS film-coated tablets is displayed in Table 1. ISENTRESS and ISENTRESS HD should be taken by mouth and may be taken with or without food [see Clinical Pharmacology (12.3)].

Table 1: Dosing Recommendations for ISENTRESS and ISENTRESS HD in Adult Patients

Population	Recommended Dose
Treatment-naïve patients or patients who are virologically suppressed on an initial regimen of ISENTRESS 400 mg twice daily	1200 mg (2 × 600 mg) once daily or 400 mg twice daily
Treatment-experienced	400 mg twice daily
Treatment-naïve or treatment-experienced when coadministered with rifampin [see Drug Interactions (7.1)]	800 mg (2 × 400 mg) twice daily

2.3 Pediatrics

The recommended pediatric dosage of ISENTRESS is displayed in Table 2. ISENTRESS film-coated tablets, chewable tablets and for oral suspension should be taken by mouth and may be taken with or without food [see Clinical Pharmacology (12.3)].

Table 2: Dosing Recommendations for ISENTRESS and ISENTRESS HD in Pediatric Patients

	Recommended Pediatric Dosage and Formulation
Population/Weight	Film-Coated Tablets 400 mg	Film-Coated Tablets 600 mg	Chewable Tablets 100 mg and 25 mg	For Oral Suspension 100 mg
If able to swallow a tablet
If at least 40 kg and either: treatment-naïve or virologically suppressed on an initial regimen of ISENTRESS 400 mg twice daily	400 mg twice daily	1200 mg (2 × 600 mg) once daily	300 mg twice daily (see Table 3)	NA
If at least 25 kg	400 mg twice daily*	NA	Weight-based dosing twice daily (see Table 3)	NA
If at least 4 weeks of age and weighing 3 kg to less than 25 kg	NA	NA	Weight-based dosing twice daily (see Table 4)	Weight-based dosing twice daily up to 20 kg (see Table 4)
From birth to 4 weeks (28 days) weighing at least 2 kg	NA	NA	NA	Weight-based dosing once daily or twice daily (see Table 5)

Table 3: Alternative Dosage* with ISENTRESS Chewable Tablets for Pediatric Patients Weighing at Least 25 kg

Body Weight (kg)	Dose	Number of 100 mg Chewable Tablets
The weight-based dosing recommendation for the chewable tablet is based on approximately 6 mg/kg/dose twice daily [see Clinical Pharmacology (12.3)]. † The 100 mg chewable tablet can be divided into equal halves.
25 to less than 28	150 mg twice daily	1.5 × 100 mg† twice daily
28 to less than 40	200 mg twice daily	2 × 100 mg twice daily
At least 40	300 mg twice daily	3 × 100 mg twice daily

Table 4: Recommended Dosage* for ISENTRESS For Oral Suspension and Chewable Tablets in Pediatric Patients at Least 4 Weeks of Age and Weighing at Least 3 kg and Less than 25 kg

Body Weight (kg)	Volume (Dose) of Suspension to be Administered	Number of Chewable Tablets†
The weight-based dosing recommendation for the chewable tablet and oral suspension is based on approximately 6 mg/kg/dose twice daily [see Clinical Pharmacology (12.3)]. † The chewable tablets are available as 25 mg and 100 mg tablets. ‡ May be administered as a crushed tablet(s); see General Dosing Recommendations (2.1) for guidance. § The 100 mg chewable tablet can be divided into equal halves.
3 to less than 4	2.5 mL (25 mg) twice daily	1 × 25 mg twice daily‡
4 to less than 6	3 mL (30 mg) twice daily
6 to less than 8	4 mL (40 mg) twice daily	2 × 25 mg twice daily‡
8 to less than 10	6 mL (60 mg) twice daily
10 to less than 14	8 mL (80 mg) twice daily	3 × 25 mg twice daily‡
14 to less than 20	10 mL (100 mg) twice daily	1 × 100 mg twice daily
20 to less than 25	Not applicable	1.5 × 100 mg§ twice daily

• For full-term neonates (birth to 4 weeks [28 days] of age): Weight-based dosing of the oral suspension as specified in Table 5.
• No data are available in pre-term neonates. The use of ISENTRESS is not recommended in pre-term neonates.

Table 5: Recommended Dose for ISENTRESS For Oral Suspension in Full- Term Neonates (Birth to 4 Weeks [28 days] of Age)

Body Weight (kg)	Volume (Dose) of Suspension to be Administered
Note: If the mother has taken ISENTRESS or ISENTRESS HD 2-24 hours before delivery, the neonate's first dose should be given between 24-48 hours after birth.
The dosing recommendations are based on approximately 1.5 mg/kg/dose. † The dosing recommendations are based on approximately 3 mg/kg/dose.
Birth to 1 Week - Once daily dosing*****
2 to less than 3	0.4 mL (4 mg) once daily
3 to less than 4	0.5 mL (5 mg) once daily
4 to less than 5	0.7 mL (7 mg) once daily
1 to 4 Weeks - Twice daily dosing**†**
2 to less than 3	0.8 mL (8 mg) twice daily
3 to less than 4	1 mL (10 mg) twice daily
4 to less than 5	1.5 mL (15 mg) twice daily