Viagra, also known as sildenafil, is a drug used to treat erectile dysfunction (sexual impotence) in men.
Features
Viagra blocks phosphodiesterase-5 (a chemical found in the penis) and allows more blood to flow to the penis resulting in an erection, according to WebMD.
Side Effects
Viagra's common side effects include such symptoms as headache, trouble breathing, muscle pain and diarrhea, according to the Mayo Clinic. Although rare, clumsiness, difficulty swallowing and abnormal dreams can result. More side effects are possible than those listed here. Call your doctor if these or any new side effects develop.
Warning
Before taking Viagra, tell your doctor about your medical history, the medications you are taking and allergies.
Storage
Store Viagra at room temperature and keep it far from the reach of children.
Famous Ties
Bob Dole, a former United States Senator, is a famous spokesperson for Viagra.
