The mechanism of action for ED pills is simple: They inhibit the PDE5 enzyme which regulates the signals responsible for the smooth muscle tissue. According to the FDA, generic medications contain the same active ingredients as brand names, meaning there’s no difference in effectiveness or safety. Alpha-blockers are sometimes prescribed for prostate problems or high blood pressure. Payment options: Consider how you’d like to pay. If you experience chest pain, dizziness, or nausea during sex, seek immediate medical help. Sildenafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow easily.AdDiscover UltraCore’s Top Mens Sex Pill. Male UltraCore’s sex pill is scientifcally proven to deliver breakthrough ry Leaders · Watch Video · Fully Equipped · Custom Formulation. The generic name for Viagra is sildenafil. The drug also has another brand name: Revatio. It works by slowing down the action of PDE5, an enzyme in the blood vessel walls.. This enzyme breaks down. Yes, sildenafil (the active ingredient in Viagra), manufactured by Teva, is the FDA approved generic for brand Viagra. It launched on December 11, The announcement from Teva can be seen here. It is available in each strength that the brand is available in: Being an FDA approved generic indicates that the generic is considered to .