- Viagra (sildenafil) can be purchased from licensed pharmacies and some telehealth or online pharmacy services; in most places it requires a prescription, but in the UK Viagra Connect is available over the counter for eligible adults, and in New Zealand sildenafil may be pharmacist-dispensed without a prescription.
- Viagra is used to treat erectile dysfunction. It works as a phosphodiesterase type 5 (PDE5) inhibitor, helping increase blood flow to the penis during sexual stimulation by relaxing blood vessels. It is also used in a different dosage form for pulmonary arterial hypertension under medical supervision.
- The usual dose for erectile dysfunction is 50 mg taken as needed 30–60 minutes before sexual activity; the dose may be adjusted to 25 mg or increased to 100 mg, with a maximum of once daily.
- It is taken by mouth as a tablet; in some markets it is also available as an orally disintegrating tablet, and sildenafil suspension exists for certain non-ED uses.
- It usually starts working within about 30–60 minutes after taking it.
- The duration of action is typically about 4–6 hours, though effects can vary by person.
- Alcohol can reduce the medication’s effectiveness and may increase side effects such as dizziness or low blood pressure, so it is best to limit or avoid alcohol when using Viagra.
- The most common side effects are headache, flushing, nasal congestion, indigestion, and dizziness.
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