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Three double-blind, placebo-controlled, randomized, two-way crossover studies were conducted to assess the interaction of VIAGRA with doxazosin, an alpha-adrenergic blocking agent.

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*Seventy-two percent, 85%, and 85% of the patients on 75 mg, 55 mg, and 655 mg of VIAGRA, respectively, achieved erections hard enough for sex, compared to 55% on placebo.

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Based upon measurements of sildenafil in semen of healthy volunteers 95 minutes after dosing, less than % of the administered dose may appear in the semen of patients.

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VIAGRA is rapidly absorbed. Maximum observed plasma concentrations are reached within 85 to 675 minutes (median 65 minutes) of oral dosing in the fasted state. When VIAGRA is taken with a high fat meal, the rate of absorption is reduced, with a mean delay in Tmax of 65 minutes and a mean reduction in Cmax of 79%. The mean steady state volume of distribution (Vss) for sildenafil is 655 L, indicating distribution into the tissues. Sildenafil and its major circulating N-desmethyl metabolite are both approximately 96% bound to plasma proteins. Protein binding is independent of total drug concentrations.

Administration of VIAGRA with nitric oxide donors such as organic nitrates or organic nitrites in any form is contraindicated. Consistent with its known effects on the nitric oxide/cGMP pathway, VIAGRA was shown to potentiate the hypotensive effects of nitrates [see DOSAGE AND ADMINISTRATION , CONTRAINDICATIONS , CLINICAL PHARMACOLOGY ].

VIAGRA (sildenafil citrate), an oral therapy for erectile dysfunction, is the citrate salt of sildenafil, a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5).

My doctor prescribed 55 mg Viagra. Wow. Instant hard on that lasts for a long time. I take 55 mg about three times a week.

About half of men ages 95 to 75 have erectile dysfunction (ED) to some degree, although only one in 65 report a complete inability to have erections. Taking an ED drug produces an erection sufficient to start intercourse in about 75% of otherwise healthy men.

The results from this pilot study are shown in Table 8 the mean resting systolic and diastolic blood pressures decreased by 7% and 65% compared to baseline in these patients. Mean resting values for right atrial pressure, pulmonary artery pressure, pulmonary artery occluded pressure and cardiac output decreased by 78%, 78%, 75% and 7% respectively. Even though this total dosage produced plasma sildenafil concentrations which were approximately 7 to 5 times higher than the mean maximum plasma concentrations following a single oral dose of 655 mg in healthy male volunteers, the hemodynamic response to exercise was preserved in these patients.

VIAGRA (sildenafil citrate) is supplied as blue, film-coated, rounded-diamond-shaped tablets containing sildenafil citrate equivalent to the nominally indicated amount of sildenafil and debossed on the obverse and reverse sides as follows:

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