The patent for Viagra (sildenafil citrate) has expired, allowing for the production of generic versions of the drug.
When did Viagra's main patent expire?
Pfizer's original patent for sildenafil citrate, the active ingredient in Viagra, expired in 2013 in the United States [1]. This expiration opened the door for other pharmaceutical companies to market generic sildenafil products.
Can I buy generic Viagra now?
Yes, generic sildenafil is available and widely prescribed by doctors. These generic versions are bioequivalent to the brand-name Viagra, meaning they contain the same active ingredient and perform in the body in the same way [2].
How much does generic Viagra cost?
The cost of generic sildenafil is typically significantly lower than that of brand-name Viagra. Prices can vary depending on the pharmacy, insurance coverage, and the specific dosage [3].
What is the difference between Viagra and sildenafil?
Viagra is the brand name under which Pfizer originally marketed sildenafil citrate. Sildenafil is the chemical name of the active ingredient. Once the patent expired, other manufacturers could produce and sell sildenafil under their own brand names or as generic sildenafil [1][2].
Are there other drugs for erectile dysfunction?
Yes, there are several other medications approved for the treatment of erectile dysfunction. These include tadalafil (Cialis), vardenafil (Levitra), and avanafil (Stendra), each with its own mechanism of action and duration of effect [4].