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Generally Viagra requires 30-60 minutes to take effect, therefore take it at least one hour before you intend to have sex. However the length of time Viagra takes to work can be affected by food, alcohol and sexual stimulation.
In rare cases, it can cause fainting. Some men taking PDE5 inhibitors report back or muscle pain.
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Viagra for men

lawn greeningIt is a medicine used to treat erection problems (erectile dysfunction). It is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). If you have erection problems Viagra works by temporarily increasing blood flow to your penis when you get sexually excited.

 

When a person takes it orally, the body rapidly absorbs Viagra. The concentration of Viagra in the blood peaks around 30–120 minutes after taking the drug — usually around the 60 minute mark. It is possible to start feeling the effects of Viagra at any time during this window.

 

  • Just as Viagra helps improve blood flow for an erection, it may improve blood flow in the female reproductive parts. When this happens, it may cause more sensitivity and stimulation, causing the person taking it to become more aroused.

 

  • Is it normal to have an erection for two hours? Erections typically last a few minutes or, in some cases, up to about a half hour. If you have an erection that lasts more than a four hours (priapism) or one that's unrelated to sex, talk to your doctor right away or seek emergency care.

 

  • Like all medications, Viagra has an active life and half-life. The half-life of sildenafil is approximately four hours. This means that the active amount of Viagra in your bloodstream will reduce by approximately half every four hours.

 

  • It is a solid, diamond-shaped blue pill (not a gel or soft tab), with the manufacturer's name, Pfizer, imprinted on one side and the letters VGR 25, VGR 50, or VGR 100 imprinted on the other side, indicating the dose of the medication in the pill (25 mg, 50 mg, or 100 mg).

 

Unlike in the United Kingdom, Viagra is not available for sale OTC in the US. It's currently only available via prescription. Because of high demand, several illegal websites claim to sell Viagra online, but these sources are unmonitored and often dangerous.