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This disease occurs when the blood vessels leading to and from the lungs are not widening enough, due to a physiological effect or to the hardening of the arteries. PAH, if left untreated, can lead to death. Because Viagra widens the blood vessels, it works well as a treatment for PAH because it permits the blood to flow more freely through the pulmonary region. Pfizer, the parent company of Viagra, now markets Revatio, which is the same chemical makeup but is used specifically for treating PAH. Viagra also has developed a reputation as a party drug in some circles. Many men in the early to mid 20s who do not need Viagra for medical reasons use it enhance sexual pleasure. These men are playing a dangerous game, however, as viagra should not be used unless it is specifically prescribed by a doctor. cialis package insert need 100 mg viagra delivery viagra daily use generic viagra next day shipping
