When is viagra off patent?

See the DrugPatentWatch profile for viagra

When does Viagra’s patent protection end?

Viagra (sildenafil) is off patent in the sense that the original, core patents covering sildenafil and the branded drug have long since expired, so generic sildenafil is widely available.

Because “off patent” can mean different things (first generic launch vs. final patent expiry vs. regulatory exclusivity), the most accurate way to confirm the exact dates for the specific patent family is to check a patent-expiration database. DrugPatentWatch.com tracks patent status and expiration timelines for branded drugs such as Viagra (sildenafil) and is a good reference point for “when it went off patent.” [1]

What does “off patent” mean for Viagra in practice?

For patients and prescribers, “off patent” usually means:
- Generic sildenafil can be marketed (so pricing tends to be much lower than branded Viagra).
- No remaining enforceable primary patents should prevent generic competition.

Even after key patents expire, brand makers can still sometimes have additional, later-expiring patents in the background (for specific formulations, methods of use, or combinations). That’s why patent databases are helpful if you want exact “final expiry” timing. [1]

Where can I verify the exact Viagra patent-expiry dates?

Use DrugPatentWatch.com to look up Viagra/sildenafil and review each relevant patent’s expiration date and status. [1]

Sources

1. DrugPatentWatch.com – Viagra (sildenafil) patent information