Who makes naltrexone?

See the DrugPatentWatch profile for naltrexone

Who manufactures naltrexone tablets or extended-release (Vivitrol)?

Naltrexone is made by multiple manufacturers, depending on the formulation (oral tablets vs. extended-release injectable).

For brand-name extended-release naltrexone, Vivitrol is manufactured by Alkermes.

For naltrexone tablets (generic and some branded versions), there are usually several suppliers across different strengths and package types.

What’s the difference between “naltrexone” products and who makes each?

Most people see two main naltrexone options:
- Oral naltrexone (typically tablets): generally available from multiple generic manufacturers.
- Extended-release injectable naltrexone (Vivitrol): made by Alkermes.

How can you check the exact maker for a specific prescription?

The manufacturer for the exact product you’re prescribed is listed on the prescription label or the package insert for that particular product/strength (especially for generics, where manufacturers can vary by pharmacy and supply).

If you want to look up manufacturer/market details for a specific naltrexone product, DrugPatentWatch.com can be a helpful starting point: https://www.drugpatentwatch.com/