Naltrexonedrug info
naltrexone 380 MG Injection [Vivitrol]
What it is used for
Treatment with VIVITROL should be part of a comprehensive management program that includes psychosocial support. VIVITROL contains naltrexone, an opioid antagonist, and is indicated for the treatment of alcohol dependence in patients who are able to abstain from alcohol in an outpatient setting prior to initiation of treatment with VIVITROL. Patients should not be actively drinking at the time of initial VIVITROL administration. VIVITROL is indicated for the prevention of relapse to opioid dependence, following opioid detoxification. VIVITROL should be part of a comprehensive management program that includes psychosocial support.
1.1 Alcohol
Dependence VIVITROL is indicated for the treatment of alcohol dependence in patients who are able to abstain from alcohol in an outpatient setting prior to initiation of treatment with VIVITROL. Patients should not be actively drinking at the time of initial VIVITROL administration. 1.2 Opioid Dependence VIVITROL is indicated for the prevention of relapse to opioid dependence, following opioid detoxification.
Text above is quoted in full from the FDA-approved drug label published by openFDA, effective May 31, 2026. Matched to this product by RxNorm code. Cross-references to other sections of the full prescribing information have been removed, since they point to a document not shown here. Nothing else is changed: no sentence is shortened, reworded or summarised.
Description
VIVITROL ® (naltrexone for extended-release injectable suspension) is supplied as a microsphere formulation of naltrexone for suspension, to be administered by deep intramuscular injection by a healthcare practitioner. VIVITROL contains naltrexone base anhydrous as the active pharmaceutical ingredient. Naltrexone is an opioid antagonist with little, if any, opioid agonist activity. Naltrexone is morphinan-6-one, 17-(cyclopropylmethyl)-4,5-epoxy-3,14-dihydroxy-(5α) (CAS Registry # 16590-41-3). The molecular formula is C 20 H 23 NO 4 and its molecular weight is 341.41 in the anhydrous form (ie, < 1% maximum water content).
The structural formula is: Naltrexone base anhydrous is an off-white to a light tan powder with a melting point of 168 °C to 170 °C (334 °F to 338 °F). It is insoluble in water and is soluble in ethanol. VIVITROL is provided in a carton containing one vial of VIVITROL microspheres, one vial of diluent, one 5-mL syringe, one 1-inch 20-gauge preparation needle, two 1 1/2-inch 20-gauge, and two 2-inch 20-gauge administration needles with needle protection device. VIVITROL microspheres consist of a sterile, off-white to light tan powder that is available in a dosage strength of 380 mg of naltrexone per vial. Naltrexone base anhydrous is incorporated in a biodegradable matrix of 75:25 polylactide-co-glycolide (PLG) at a concentration of 337 mg of naltrexone per gram of microspheres. The diluent is a clear to slightly opalescent, colorless to slightly yellow solution. Each mL of diluent contains 5.0 to 35.0 mg of carboxymethylcellulose sodium, 1.0 mg of polysorbate 20, 5.0 to 12.0 mg of sodium chloride, and sodium hydroxide and hydrochloric acid as pH adjusters, in Water for Injection. The pH of the diluent is in the range of 5.8 to 7.2. Naltrexone Structural Formula
Text above is quoted in full from the FDA-approved drug label published by openFDA, effective May 31, 2026. Matched to this product by RxNorm code. Cross-references to other sections of the full prescribing information have been removed, since they point to a document not shown here. Nothing else is changed: no sentence is shortened, reworded or summarised.
This page reproduces regulatory text for reference. It is not medical advice, and KenyRx is not a pharmacy or a prescriber. Talk to a doctor or pharmacist about whether a medicine is right for you.
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