Viagra drug classification?

What class is Viagra (sildenafil)?

Viagra (sildenafil) is a prescription medicine in the class of drugs called PDE5 inhibitors (phosphodiesterase type 5 inhibitors). PDE5 inhibitors work by helping increase blood flow by relaxing smooth muscle in blood vessels.

What is Viagra used for?

In clinical practice, sildenafil is used for erectile dysfunction (ED) and for pulmonary arterial hypertension (PAH), depending on the specific product/indication and formulation.

How does Viagra’s classification relate to other ED medicines?

As a PDE5 inhibitor, Viagra is in the same drug class as other sildenafil-like medicines used for ED, such as tadalafil (Cialis) and vardenafil (Levitra). They differ by dosing schedule and duration of effect, but they share the core mechanism of inhibiting PDE5.