sildenafil (Viagra)

Sildenafil, commonly known as Viagra, is a medication used primarily to treat erectile dysfunction in men, helping them achieve and maintain an erection during sexual activity. It works by relaxing blood vessels and increasing blood flow to the penis when sexually stimulated. Sildenafil is usually taken in pill form about an hour before sexual activity, and its effects can last for several hours. It is important to note that sexual arousal is still necessary for the medication to work. Sildenafil may also be prescribed for pulmonary hypertension, a condition that affects blood pressure in the lungs.