Description
Viagra is
a brand-name prescription medication containing the active ingredient sildenafil, used primarily to treat erectile dysfunction (ED) in men. It works by increasing blood flow to the penis when a man is sexually aroused, which helps him get and maintain an erection.
Key Facts
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- Active Ingredient: Sildenafil citrate.
- Mechanism: It is a phosphodiesterase-5 (PDE5) inhibitor, which relaxes blood vessels in the penis.
- Usage: It is taken orally, usually as needed, about 30 minutes to 4 hours before sexual activity.
- Dosage: Common strengths are 25 mg, 50 mg (typical starting dose), and 100 mg.
- Prescription: A prescription from a healthcare professional is required to obtain Viagra (though a non-prescription version, Viagra Connect, is available in the UK after a pharmacist consultation).
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