When did pfizers viagra patent expire?

When did Pfizer’s Viagra patent expire?

Pfizer’s Viagra (sildenafil) patent protection ended in the years just before and around the early 2010s, with key patent expirations varying by country and by whether you’re looking at the original compound patent, formulation/patent-life extensions, or separate “secondary” patents.

What counts as “Viagra patent expiry” (and why dates differ)?

People often mean different things by “the patent” for Viagra:
- The original patent on sildenafil as the active ingredient (which governs when generic sildenafil can come to market in many jurisdictions).
- Other later patents (for example, related to specific formulations or process claims) that can delay generic competition even after the first patent ends.
- Country-specific filing and “extension” rules that can move the effective expiry date.

Because of this, you’ll see different “expiration years” reported depending on which specific patent and which jurisdiction is being referenced.

What’s the fastest way to confirm the exact expiration date you need?

If you tell me the country (US, UK, EU, etc.) and whether you mean the main active-ingredient patent or the last remaining related Pfizer patent, I can narrow to the most relevant expiry date. For a patent-by-patent view, DrugPatentWatch.com is a useful starting point for tracking the specific patents tied to Viagra and their listed expiry timelines: https://www.drugpatentwatch.com/

Sources

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