Viagra (Sildenafil - 100mg)

Sildenafil is a medication primarily used to treat erectile dysfunction (ED) in men and pulmonary arterial hypertension (PAH) in both men and women. It belongs to a class of drugs known as phosphodiesterase type 5 (PDE5) inhibitors.

Uses:
Erectile Dysfunction: Sildenafil helps men achieve and maintain an erection when sexually stimulated by increasing blood flow to the penis. Pulmonary Arterial Hypertension: It relaxes blood vessels in the lungs, improving blood flow and reducing the heart's workload.

How It Works:
Sildenafil works by inhibiting the enzyme PDE5, which breaks down cGMP, a molecule that helps relax blood vessels. This action enhances blood flow to the penis during sexual arousal, facilitating an erection.

Dosage and Administration:
Erectile Dysfunction: The typical starting dose is 50 mg, taken about one hour before sexual activity. It can be adjusted to 100 mg or reduced to 25 mg based on effectiveness and tolerance. Pulmonary Arterial Hypertension: The usual dose is 20 mg taken three times a day.

Important Considerations:
Timing: Sildenafil usually takes about 30 to 60 minutes to start working, with effects lasting up to four hours. Food Interactions: Taking it with a high-fat meal may delay its effects.