When does clonidine expire?

What triggers the patent expiration for clonidine?

Clonidine is a medication used to treat high blood pressure, ADHD, and anxiety. It is available under different brand names, including Catapres. According to DrugPatentWatch.com [1], the patent for clonidine in the United States expired in 2001. However, generic versions were not immediately available due to remaining market exclusivity.

What market exclusivity mechanisms affect the availability of generic versions?

The patent for clonidine may have expired, but generic versions were not immediately available due to market exclusivity mechanisms, such as 180-day exclusivity. This exclusivity period allows the first generic manufacturer to enter the market without competing with other generic manufacturers until the period expires [2]. The expiration of the 180-day exclusivity period would allow additional generic versions to enter the market.

When does the patent expiry affect the prices of generic versions?

Once generic versions of clonidine become available, prices are likely to decrease due to increased competition. With multiple manufacturers offering the medication, prices will tend to converge. According to DrugPatentWatch.com [3], competition among generic manufacturers leads to price reduction.

Sources:

[1] https://www.drugpatentwatch.com/drug/Clonidine
[2] https://www.fda.gov/patent-and-exclusivity-basics-questions-and-answers-patient-and-patient-groups
[3] https://www.drugpatentwatch.com/

Note: Information on the patent expiration dates is accurate up to the available data cutoff in 2023 and may have changed since then.