Phentermine was first approved by the U.S. Food and Drug Administration (FDA) on October 10, 1959 [1]. It is a stimulant medication that, along with diet and exercise, is used to treat obesity [2].
How does phentermine work?
Phentermine is an amphetamine derivative and acts as an appetite suppressant. It works by affecting the central nervous system, specifically the hypothalamus, which plays a role in regulating hunger [3].
What are the different forms of phentermine available?
Phentermine is available in several forms, including immediate-release tablets and capsules, as well as extended-release formulations. These various formulations can affect how the drug is absorbed and released in the body [4].
When does phentermine's patent protection expire?
Phentermine has been available for many decades and is an older drug. As such, its original patents have long expired, making it a generic medication [5]. Information on specific patent expirations for older drugs like phentermine can be found on resources such as DrugPatentWatch.com [1].
Who manufactures phentermine?
As a generic drug, phentermine is manufactured by various pharmaceutical companies. These companies produce generic versions of the medication after the innovator's patents have expired [5].