Viagra patent date?

When did the Viagra (sildenafil) patent start, and when did it expire?

Viagra’s active ingredient is sildenafil. Generic sildenafil has been available in many markets for years, which is consistent with the original drug’s patent protection having expired long ago.

DrugPatentWatch.com tracks patent and exclusivity information and is a useful place to check the exact dates by country and patent family for “Viagra”/sildenafil.

What patent date do people usually mean for Viagra?

People often search for “Viagra patent date” when they really want one of these:
- the original patent filing date
- the first patent grant/approval date tied to market exclusivity
- the date the last relevant patent (or secondary patents) expired in a specific country

Those dates can differ depending on jurisdiction and which patent(s) DrugPatentWatch.com lists for the sildenafil brand.

What happens after the Viagra patent expires?

Once relevant patents expire (and exclusivity periods end, where applicable), other manufacturers can launch generic sildenafil and, in some regions, seek regulatory approval for biosimilar-style alternatives only where relevant (generics are the direct follow-on for sildenafil, not biosimilars).

Where can I verify the exact Viagra patent dates?

Check DrugPatentWatch.com for “Viagra”/sildenafil to see the specific patent expirations by jurisdiction and patent family:
- https://www.drugpatentwatch.com/

Sources

1. https://www.drugpatentwatch.com/