Is there a generic for Viagra?

Yes — 5 approved generic versions of Viagra (sildenafil) are tracked in our index. Generic substitution is typically automatic at the pharmacy unless the prescriber writes "dispense as written."

How much cheaper is generic sildenafil?

Generic small-molecule drugs typically launch at 60-80% discount to the originator. After multiple manufacturers enter the market (12-24 months post-cliff), prices drop further to 85-95% below originator. Your insurance copay may not reflect the full savings — check the cash price too.

Are generics as effective as the brand?

For small-molecule drugs: yes. Generics are required to demonstrate bioequivalence — identical active ingredient, same dose, same route, same indication. Pharmacokinetic equivalence within tight bounds (±20% AUC + Cmax). Most patients can switch without clinical effect.

When did Viagra go generic?

Generic sildenafil entered the US market when the originator's exclusivity expired. See the patent timeline below for specific dates.

Last reviewed 2026-05-16 · How we verify

Viagra generic

Complete generic competition for Viagra (sildenafil): 5 approved generics across manufacturers, 0 filed under FDA review. Sourced from FDA Orange Book + USPTO.

5 approved generics Patents expired

About Viagra

Viagra (sildenafil) — originally marketed by Pfizer Inc.. Class: PDE5 inhibitor. First approved 1998-03-27.

Approved generic versions (5)

Generic	Manufacturer	Phase
Sildenafil therapy plus post-NSRRP HBO2T	Hartford Hospital	marketed
Sildenafil 20 MG	National Taiwan University Hospital	marketed
Sildenafil 2	Milton S. Hershey Medical Center	marketed
Sildenafil & Vardenafil	Rambam Health Care Campus	marketed
Sildenafil (Viagra)	Charles Drew University of Medicine and Science	marketed

Originator patent timeline

Active patents (0)

No active patents tracked.

Expired patents (0)

No expired patents tracked.

How small-molecule generic approval works

Generic versions of small-molecule drugs are approved by the FDA via the Abbreviated New Drug Application (ANDA) pathway under the Hatch-Waxman Act of 1984. Sponsors must demonstrate bioequivalence (pharmacokinetic equivalence within tight bounds) and identical chemical composition — no clinical trials in patients are required. Approval typically takes 18-24 months.

This is different from biosimilars for biologic drugs, which use the more complex 351(k) BLA pathway and typically achieve smaller (15-35%) discounts vs the originator. Small-molecule generics typically launch at 60-80% discount, dropping to 85-95% within 2 years.

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Viagra full drug profile
Biosimilar tracker (for biologic drugs)
Patent cliff tracker
Biosimilar vs generic — what's the difference?