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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