Viagra, Levitra, and Cialis
These drugs, called phosphodiesterase-5 inhibitors, are approved by the U.S. Food and Drug Administration (FDA) and work by increasing blood flow to an erection.
Also, is there an over the counter Viagra?
Viagra is a prescription drug used to treat erectile dysfunction. It is not available over the counter and requires a health professional to prescribe it.
Also know, what pills keep you hard for hours? Are there pills that can help me stay hard longer? There are a number of FDA-approved pills that treat ED. These include sildenafil (Viagra), avanafil (Stendra), tadalafil (Cialis), and vardenafil (Levitra). They all assist with blood supply to the penis.