Which drug for erectile dysfunction? - Harvard Health

Viagra (sildenafil) is a prescription drug that s used to treat erectile dysfunction (ED). The drug comes as an oral tablet. It s usually taken as needed about 1 hour before sexual activity. Buying oral erectile dysfunction medications online. Treatments for erectile dysfunction are big business, and online scams abound. If you do buy medicines over the internet: Check to see if an online pharmacy is legitimate. 4.1 Nitrates. Consistent with its known effects on the nitric oxide/cGMP pathway [see Clinical Pharmacology (12.1, 12.2)], VIAGRA was shown to potentiate the hypotensive effects of nitrates, and its administration to patients who are using nitric oxide donors such as organic nitrates or organic nitrites in any form either regularly and/or intermittently is therefore contraindicated. where to buy viagra walmart 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). Cialis is an oral tablet that starts to work about 30 minutes after you take it. It can improve erectile function for up to 36 hours. The starting daily dose range is 2.5 to 5 milligrams (mg) but

Generic name: sildenafil (oral) [ sil-DEN-a-fil ] Brand names: Revatio, Viagra. Drug class: Impotence agents. Medically reviewed by Sophia Entringer, PharmD. Last updated on. Uses. Warnings. Before taking. Dosage. Side effects. Interactions. FAQ. What is Viagra?

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