Sildenafil citrate (produced and supplied under Viagra, Revatio and other trademarks) is a drug developed by the pharmaceutical company Pfizer and used in the treatment of male erectile disorders and impotence, as well as in the treatment of pulmonary arterial hypertension (PAH). Tadalafil (Cialis) and vardenafil (Levitra) are another similar medicines which compete with Viagra on the pharmaceutical market. Sildenafil citrate is available under several names. The drug which is sold under the name Viagra is intended for the treatment of male sexual disorders, whereas Revatio is intended both for women and men and used for pulmonary arterial hypertension treatment and for increasing of stamina and general physical condition. It's very easy to purchase the drugs online today. The dosage and taking schedule must be defined by doctor. The usual dose makes up from 25 mg to 100 mg of sildenafil and is taken no less than half an hour and no more than 4 hours before coitus. The recommended starting dose is 50 mg, and then the dose is defined more precisely according to results of the treatment. The pills with the doses of 25, 50, and 100 mg are available on the market with the price about 10 USD per single pill. Branded Viagra pills are not scored and it's almost impossible to break them precisely because they are too hard. The pill of Viagra looks like blue diamond with inscribed words "Pfizer" and "VGR xx" (where xx is the dose of the pill - 25, 50 or 100 milligrams) on the opposite sides. If you want to buy cheap viagra online - not a problem. | 