Viagra

Viagra, also known by its generic name sildenafil, is a medication primarily used to treat erectile dysfunction (ED) in men. It works by increasing blood flow to the penis, helping to achieve and maintain an erection when sexually aroused. 

Viagra is also used under the brand name Revatio to treat pulmonary arterial hypertension, a condition characterized by high blood pressure in the blood vessels supplying the lungs.

Key points about Viagra:
- Usage: Taken as needed, usually 30 to 60 minutes before sexual activity. It can be effective for up to 4 hours.
- Common Side Effects: Headaches, flushing, indigestion, and dizziness.
- Precautions: Should not be taken with nitrates (often prescribed for chest pain) as this combination can cause a dangerous drop in blood pressure.

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