Sildenafil: Usage, Dosage Side Effects – Drugs.com

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CHOOSE BRAND-NAME VIAGRA. The original little blue pill prescribed by doctors for over 25 years. Clinically proven to treat men with erectile dysfunction (ED) Ongoing commitment to product quality and safety monitoring. Learn More. buy viagra process Don’t be fooled into buying herbal viagra. Never take any medicines that claim to be the herbal or nonprescription version of an oral medicine for ED. These aren’t an effective option, and some contain harmful substances. Sildenafil may be used to treat erectile dysfunction (ED or impotence) in men (Viagra brand) or pulmonary arterial hypertension in both men and women (Revatio brand), depending on the brand. Sildenafil blocks the action of an enzyme known as cGMP-specific phosphodiesterase type-5 (PDE-5).