Sildenafil

Sildenafil is a medication primarily used to treat erectile dysfunction in men by increasing blood flow to the penis, which helps achieve and maintain an erection. It works by relaxing the blood vessels in the area, allowing for improved circulation. Sildenafil is often known by its brand name, Viagra. It may also be used to treat pulmonary arterial hypertension, a condition that affects blood flow in the lungs. The drug is usually taken before sexual activity and its effects can last for several hours, but it should only be used under a doctor's guidance due to potential side effects and interactions.