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The effect of supplemental L-arginine on tolerance development during continuous transdermal nitroglycerin therapy. J Am Coll Cardiol. 2002;39(7):1199-1203. Wilson AM, Harada R, Nair N, Balasubramanian, Cooke JP. L-arginine supplementation viagra nhs peripheral arterial disease: no benefit and possible harm. Circulation.

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5 hour before sexual activity. Based on effectiveness and toleration, the dose may be increased to a maximum recommended dose of 100 mg or decreased to 25 mg. The maximum recommended dosing frequency is once per day. Ask your health care provider any questions you may have about how to use Viagra.

Goldenberg MM "Safety and efficacy of sildenafil citrate in the treatment of male erectile dysfunction. " Clin Ther 20 (1998): 1033-48. Conti CR, Pepine CJ, Sweeney M "Efficacy and safety of sildenafil citrate in the treatment of erectile dysfunction in patients with ischemic heart disease. " Am J Cardiol 83 (1999): c29-34.]