Sildenafil citrate patent expiration date?

When does the sildenafil citrate patent expire?

Sildenafil citrate’s main patent protections have long since expired in most major markets, which is why many sildenafil products (including generics) are widely available.

Because the exact “patent expiration date” depends on which patent you mean (compound patent vs. formulation/use patent) and which country/market you’re asking about, the most reliable way to confirm a specific expiration date is to check the patent record for your jurisdiction and product brand.

A practical way to look this up is DrugPatentWatch.com, which tracks drug patent status by product and market:
- https://www.drugpatentwatch.com/