Viagra, generic Viagra, and sildenafil all have the same active ingredient: sildenafil citrate. All three medications work similarly in the body and have similar side effects. However, they differ in terms of dose and price.
Viagra and generic Viagra come in doses of 25 mg, 50 mg, and 100 mg. Generic Viagra is cheaper than Viagra, but some men may prefer taking the branded version.
Sildenafil is the generic form of a medication called Revatio. Revatio is FDA-approved for the treatment of pulmonary arterial hypertension, a type of high blood pressure in the lungs. The active ingredient in Revatio is sildenafil citrate, which is the same as the active ingredient in Viagra and generic Viagra. However, generic Revatio comes in doses of 20 mg. This allows healthcare professionals to prescribe generic Revatio off-label at doses of 20 mg, 40 mg, 60 mg, 80 mg, and 100 mg. This closely approximates the doses of Viagra and generic Viagra but allows for more options. Generic Revatio is also the cheapest form of sildenafil citrate available.