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Product Description

Originally called UK-92,480, Viagra was initially developed for treatment of hypertension. In a subsequent human toleration study as a possible drug for angina, some very strange side-effects were noted. NO acts as a vasodilator in the process of penile erection. NO is supplied from two sources. The first is as a neurotransmitter liberated by the cavernous nerve which innervates smooth muscle surrounding penile arteries. The second source is the endothelial cells viarga the deep arteries of the jwl t viagra. Endothelium-derived NO is formed in response to stimulation comprimido azul viagra the endothelial cells by cholinergic nerves.

This has occurred vkagra a small number of people taking sildenafil, most of whom also had revlimid contre indications viagra disease, diabetes, high blood pressure, high cholesterol, or certain pre-existing eye problems, and in those who smoked or were over 50 years old. It is not clear whether sildenafil is the actual cause of vision loss. This medicine is not expected giagra harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.

Detailed information

Stop taking Viagra and get emergency medical help if you have: heart attack symptoms--chest pain or pressure, pain spreading to your jaw or shoulder, nausea, sweating; vision changes or sudden vision loss; or. erection is painful or lasts longer than 4 hours (prolonged erection can damage the penis). Call your doctor at once if you have: ringing in your ears, or sudden hearing loss; swelling in your hands, ankles, or feet; shortness of breath; seizure (convulsions); or.

Pfizer shares declined Friday on the New York Stock Exchange after news of the blindness cases. Viagra and its competitors are blockbuster drugs that revolutionized treatment of erectile dysfunction, and they already come with serious warnings: They‚re not to be used by men who take nitrate-containing drugs, because the interaction could cause deadly drops in blood pressure, or by men with heart conditions whose doctors have warned that sex itself could be too much exertion. Rates of women who are opting for preventive mastectomies, such as Angeline Jolie, have increased by an estimated 50 percent in recent years, experts say. But many doctors are puzzled because the operation doesn't carry a 100 percent guarantee, it's major surgery -- and women have other options, from a once-a-day pill to careful monitoring. All three also warn about temporary vision changes ‚ seeing bluish tinges or having difficulty distinguishing between green and blue. The drugs apparently have a temporary effect on the retina, a different issue from NAION.

('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect.]