Sildenafil is the affordable way to get the FDA-approved active ingredient that Viagra® has for treating ED. These pills help blood vessels to relax and smooth muscle. The result is improved blood flow, which means a harder and longer-lasting erection.
Sildenafil is a type of drug called a PDE5 inhibitor. PDE5 inhibitors work by blocking an enzyme called PDE5 (phosphodiesterase type 5), which in turn temporarily relaxes blood vessels and improves blood flow to the penis during sexual stimulation. For men who have trouble getting or staying hard, PDE5 inhibitors like sildenafil are typically the first line of treatment for erectile dysfunction.
Sildenafil is used to treat erectile dysfunction by improving blood flow to the penis. Sildenafil is also used to treat pulmonary arterial hypertension by relaxing blood vessels in the chest near the heart and lungs. The PDE5 enzyme is active in both the lungs and penis, which is why sildenafil is approved by the Food and Drug Administration for the treatment of erectile dysfunction and pulmonary arterial hypertension.