One of the greatest advances in sexual health for men was the creation of drugs to treat erectile dysfunction, allowing men who couldn't achieve an erection because of age, illness or injury, to resume sexual activity. Viagra, a drug famous for inspiring men to, well ... new heights, is one of the most popular medications of all time racking up sales of nearly $1.5 billion a year. It belongs to a class of drugs known as PDE-5 inhibitors. All drugs in this category -- which also includes Levitra and Cialis -- allow the walls of the blood vessels in the penis to relax so that more blood flows through; with sexual stimulation, blood flow out of the penis decreases, and the result can be improved erectile function.
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Reilly is quick to point out that most of the weirder reactions to ED drugs are rare indeed, arising less than one percent of the time. "The take home message should be for users not to exceed the recommended dosage and if you notice something wrong, pick up the phone and call your doctor immediately."
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