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If you have any information on how Viagra effects the heart, can you include it in your reply. When the patent expires, other drug companies can start manufacturing and selling a generic form of the drug.

Sexual activity can put an extra strain on your heart, especially if your heart is already weak from a heart attack or heart disease. It is also not suitable for women, or for individuals interested in increasing their libido (sex drive). Revatio is administered approximately four to six hours apart and may be administered without regard to food.

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Efficacy Results from Controlled Clinical Studies The effect on one of the major end points, maintenance of erections after penetration, is shown in Figure 6, for the pooled results of 5 fixed-dose, dose-response studies of greater than one month duration, showing response according to baseline function. Levitra (vardenafil) is similar to Viagra (sildenafil), in that it lasts about five hours; Viagra (sildenafil) lasts about four hours.

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Jen Marsico, RPh Q: I am 66 years old with chronic hypertension controlled with medications. However, taking it may cause a range of adverse effects. The FDA approval of flibanserin was based off of the results of three phase III clinical trials. Depakote could also decrease the concentration of the Dilantin. The patent for Viagra (sildenafil) will not expire until 2012; therefore, no generic form is currently available. It's not simply about a man being able to have pleasurable sex.

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R- cells, a line of mouse embryo fibroblasts with a targeted disruption of the insulin-like growth factor I (IGF-I) receptor genes, are refractory to transformation by several viral and cellular oncogenes. Whether your particular situation would benefit or be harmed by the use of this medication can only be determined by your physician. Grapefruit and grapefruit juice should be avoided, as enzymes in the fruit can stop Viagra from working altogether. You may report side effects to FDA at 1-800-FDA-1088. Nitric oxide allows the smooth muscles inside the penis to relax, promoting more blood flow to the area during sexual arousal or stimulation. I felt slightly light-headed one time after a 150 mg dose. Viagra’s effects typically last for between four and six hours, and it should not be taken unless you intend to have sex. A study looked at the effects of taking 100 mg of Viagra in a single dose, which resulted in a decrease of 8. VIAGRA helps a man with erectile dysfunction get and keep an erection only when he is sexually excited (stimulated).