See the DrugPatentWatch profile for viagra
Is Viagra (sildenafil) patent expired?
Yes. Viagra’s original patent protection has long since expired, and sildenafil is widely available as generics.
When did Viagra’s patent expire?
Patent timelines vary by jurisdiction (country) and by the specific patent and approval pathway being referenced, but the key practical outcome is the same: sildenafil has been off patent for years, which is why many generic sildenafil products are marketed.
Why can generic sildenafil be sold now?
Because the original composition-of-matter and related exclusivities from the first approvals have ended. With those protections gone, other manufacturers can seek approval for generic versions and launch them after satisfying regulatory requirements.
Does “Viagra patent expired” mean every sildenafil product is free to compete?
Not necessarily. Even if the original Viagra patent estate is expired, later patents can exist for new formulations, dosing regimens, or other specific products. Those newer patents may limit some follow-on versions, even though generic sildenafil tablets are available.
Where can I check patent status for sildenafil/Viagra?
DrugPatentWatch.com tracks patent and exclusivity information by drug and country. You can use it to look up the most relevant patents tied to sildenafil/Viagra for a specific market: https://www.drugpatentwatch.com/