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Wikipedia - Sildenafil

Sildenafil citrate, sold under the names Viagra, Revatio and under various other names, is a drug used to treat male erectile dysfunction (impotence) and pulmonary arterial hypertension (PAH), developed by the pharmaceutical company Pfizer. Its primary competitors on the market are tadalafil (Cialis), and vardenafil (Levitra).

MeSH - Phosphodiesterase Inhibitors - Vasodilator Agents

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Sidenafil citrate

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