Generic Viagra (Sildenafil): Approval History, Bioequivalence, and Cost

“Generic Viagra” refers to FDA-approved sildenafil citrate tablets made by manufacturers other than the company that originally developed and patented the drug. This page explains what generic approval actually requires, when it became available, who makes it, and how it compares to the brand-name product on cost and quality.

When Did Generic Sildenafil Become Available?

The original patent covering sildenafil citrate for erectile dysfunction expired in the United States in 2017. Once a patent expires, the FDA can approve applications from other manufacturers to sell the same active ingredient, and the first FDA-approved generic sildenafil products reached the US market in December 2017. Since then, additional manufacturers have received approval, increasing the number of generic options available at most pharmacies.

What “Bioequivalent” Actually Means

Generic manufacturers do not have to repeat the original large-scale clinical trials that established sildenafil's safety and effectiveness. Instead, they file what is called an Abbreviated New Drug Application, which requires proof that the generic product is bioequivalent to the original brand-name version. In practice, this means the generic must deliver the same active ingredient, at the same dose, into the bloodstream at a rate and extent that falls within a narrow, FDA-defined range compared to the brand-name product. It does not mean a weaker or slower-acting version — it means a pharmacologically equivalent one.

Inactive Ingredients Can Still Differ

While the active ingredient and dose must match, generic manufacturers can use different inactive ingredients, such as tablet coatings, fillers, or dyes, which is why generic tablets often look different from the brand-name version and from each other depending on manufacturer. These differences do not affect the active ingredient's performance but can occasionally matter for patients with specific allergies to a particular inactive ingredient, which is worth mentioning to a pharmacist.

Who Manufactures Generic Sildenafil?

Multiple pharmaceutical manufacturers now produce FDA-approved generic sildenafil, and which specific manufacturer's version a pharmacy stocks can vary by location and by wholesaler contract. Pharmacies typically dispense whichever FDA-approved generic they have in stock unless a prescriber specifically requests the brand-name product or a particular manufacturer by name. Patients who want to confirm which manufacturer's tablet they have received can ask the dispensing pharmacist directly, or check the imprint code on the tablet against FDA pill identification resources.

Cost Differences

Cost is the most noticeable practical difference between brand-name and generic sildenafil. Because several manufacturers now compete to supply the generic version, per-tablet pricing has dropped substantially compared to when sildenafil was available only under its original brand name. Exact pricing varies by pharmacy, by insurance formulary, and by quantity prescribed, so comparing cash-pay pricing at a few local pharmacies after a prescription is written is a reasonable way to find the lowest price for a given quantity.

Generic vs. Brand: Quick Comparison

For a closer look at tablet appearance and how sildenafil is actually taken day to day, see our Viagra pills guide. For dosing strengths and titration, see our sildenafil dosage page.