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A: Viagra (sildenafil) works by inhibiting the chemical phosphodiesterase, which leads to an increase in the effect of nitric oxide. Patti Brown, PharmD Q: Is it safe to take Viagra?

VIAGRA is a prescription medicine used to treat erectile dysfunction (ED). Pharmaceutical companies must pay for years of clinical trials before a drug can be deemed safe by the FDA to be on the market. And he really needs to take a shower before going and eat something....so I bought the Laugh and Learn about Childbirth DVD. Vobig MA "Retinal side-effects of sildenafil." Lancet 353 (1999): 1442 40. In the United States, for example, 74 percent of participants responded positively.

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At 24 hours the plasma levels of sildenafil were still approximately 200 ng/mL, compared to approximately 5 ng/mL when sildenafil was dosed alone. However, not everyone who takes Viagra will have problems.

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If you still cannot get and keep an erection after several separate attempts, talk to your pharmacist or see your doctor, who can recommend alternative treatments. The Dutch study is part of broader research conducted in Australia, New Zealand and the UK looking at the use of Sildenafil early in pregnancy to promote growth in severely underdeveloped unborn children.

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It also alleviates time and energy on the NHS and other doctor's services. Viagra's impact on men's sex lives also impacts women's sex lives. In many cases, medical follow-up information was limited. Patti Brown, PharmD Q: My husband is recovering from prostate cancer surgery and was told to take one-half of a Viagra pill every other day to increase blood flow. Goldstein I, Lue TF, Padma-Nathan H, Rosen RC, Steers WD, Wicker PA "Oral sildenafil in the treatment of erectile dysfunction." N Engl J Med 338 (1998): 1397-404 33. Pharmaceutical companies must pay for years of clinical trials before a drug can be deemed safe by the FDA to be on the market. The pattern of responses was similar for the other principal question, the ability to achieve an erection sufficient for intercourse. Increased side effects can include low blood pressure, dizziness, or vision problems.