How long does vivitrol last?

What is Vivitrol's duration of action?

Vivitrol, an extended-release naltrexone injection, is designed to provide medication therapy for alcohol and opioid use disorder over an extended period.

How is Vivitrol administered and how long does it last?

Vivitrol is administered via intramuscular injection every 4 weeks, which can last up to 28 days. The medication has a gradual release mechanism that maintains therapeutic plasma concentrations for the duration of its administration [1].

Who makes Vivitrol?

Vivitrol is a brand-name medication manufactured by Alkermes Inc. [2]. The active ingredient, naltrexone, is available under various brand names and generic forms.

When does Vivitrol's patent expire?

According to DrugPatentWatch.com, Vivitrol's patent for naltrexone injection, US Patent No. 7,795,847, expired on July 27, 2017 [3].

Can Vivitrol be used for longer or shorter durations?

While Vivitrol is designed for a 4-week injection cycle, individual treatment plans may vary. Patients may be administered an additional injection earlier than 28 days if the provider determines it's medically necessary. However, the safety and efficacy of extended Vivitrol administration beyond 4 weeks have not been well-established.

Side effects and patient concerns

It's essential for patients to discuss potential side effects and concerns with their healthcare provider. Common side effects associated with Vivitrol include headache, fatigue, and liver enzyme elevations, among others [4]. Patients with a history of opioid or alcohol use disorder should report their experiences and any concerns to their healthcare provider.

Additional resources

For more information on Vivitrol and its extended-release mechanism, consult the manufacturer's website or consult with a healthcare professional.

Sources:

[1] Alkermes Inc. (2022). Vivitrol Prescribing Information.

[2] Alkermes Inc. (2022). Company Profile.

[3] DrugPatentWatch.com (2022). US Patent No. 7,795,847: Naltrexone Injection.

[4] US Food and Drug Administration (2022). Vivitrol Label (PDF).