MECHANISM OF ACTION
VIVITROL is an opioid antagonist with highest affinity for the mu opioid receptor1
Naltrexone has few, if any, intrinsic actions besides its opioid blocking properties. However, it does produce some pupillary constriction, by an unknown mechanism.
The administration of VIVITROL is not associated with the development of tolerance or dependence. In subjects physically dependent on opioids, VIVITROL will precipitate withdrawal symptomatology.
Occupation of opioid receptors by naltrexone may block the effects of endogenous opioid peptides. It markedly attenuates or completely blocks, reversibly, the subjective effects of exogenous opioids. The neurobiological mechanisms responsible for the reduction in alcohol consumption observed in alcohol-dependent patients treated with naltrexone are not entirely understood. However, involvement of the endogenous opioid system is suggested by preclinical data.
Naltrexone blocks the effects of opioids by competitive binding at opioid receptors. This makes the blockade produced potentially surmountable, but overcoming full naltrexone blockade by administration of opioids may result in non-opioid receptor-mediated symptoms such as histamine release.
VIVITROL is not aversive therapy and does not cause a disulfiram-like reaction either as a result of opioid use or ethanol ingestion.
See how VIVITROL and counseling may help your appropriate patients with alcohol dependence
See how VIVITROL and counseling may help prevent relapse to opioid dependence in your appropriate opioid-detoxed patients
VIVITROL is not right for everyone. There are significant risks from VIVITROL treatment, including risk of opioid overdose, injection site reactions, and sudden opioid withdrawal. Strongly consider prescribing naloxone for the emergency treatment of opioid overdose. See Important Safety Information below. See Prescribing Information. Review Medication Guide with your patients.
Request a visit from a VIVITROL representative to learn more about how VIVITROL may help your appropriate patients with opioid dependence or alcohol dependence.REQUEST A REPRESENTATIVE
Reference: 1. VIVITROL [prescribing information]. Waltham, MA: Alkermes, Inc; rev March 2021.
*Terms and Conditions
Eligibility for Alkermes-Sponsored Co-pay Savings. This offer is only available to patients 18 years or older, with a prescription consistent with the Prescribing Information and the patient is not enrolled in, or covered by, any local, state, federal or other government program that pays for any portion of medication costs, including but not limited to Medicare, including Medicare Part D or Medicare Advantage plans; Medicaid, including Medicaid Managed Care and Alternative Benefit Plans under the Affordable Care Act; Medigap; VA; DOD; TRICARE; or a residential correctional program.