What is the brand name for the drug Sildenafil?

The brand name for Sildenafil is Viagra. Sildenafil is primarily used to treat erectile dysfunction and pulmonary arterial hypertension. Viagra works by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which increases blood flow to the penis and helps achieve an erection when sexually stimulated. This mechanism of action is well-established and has made Viagra a well-recognized treatment option since its approval.

In contrast, Levitra and Cialis are brand names for different medications used for similar indications but contain different active ingredients; Levitra contains vardenafil and Cialis contains tadalafil. Staxyn is another formulation of vardenafil. Thus, while these other medications might serve similar purposes, they are not the same as Sildenafil, which is why Viagra is the correct answer.