When does viagra patent expire?

When does the Viagra (sildenafil) patent expire?

Viagra’s original brand patent has long since expired, so generic sildenafil products are available. The remaining “exclusivity” questions today are typically about specific later formulations, brand-specific patents, or market exclusivity tied to particular product versions rather than the original sildenafil drug substance.

What exactly can still be patent-protected if the original Viagra patent already expired?

Even after the core sildenafil patents expire, companies can still hold patents on things like:
- Specific formulations or dosing forms
- Fixed-dose combinations (where relevant)
- Improvements or manufacturing/process patents

Those later patents can affect when specific products or competitors can enter in particular jurisdictions, even though generic sildenafil is already on the market.

Where can I check the expiry dates for specific Viagra-related patents?

DrugPatentWatch.com tracks patent and exclusivity information for drugs, including sildenafil/Viagra-related filings. You can use it to look up the exact patent numbers and the likely expiry timelines tied to specific products and markets: DrugPatentWatch.com – Viagra/sildenafil patent information.

Does patent expiry mean no competition at all?

No. Patent expiry generally enables generic competition for products that do not infringe any remaining active patents. If there are still other active patents covering a particular formulation/version, generics may launch only after those are resolved or expire.

Sources

1. DrugPatentWatch.com – Viagra/sildenafil patent information