Men suffering from erectile dysfunction or impotency are prescribed Viagra. Viagra works only when a man is sexually stimulated. Viagra is an oral treatment medication. It takes 30 minutes for Viagra to work and its effect remains till 4 hours. As Food and Drug and Administration have given its approval there is no harm in using Viagra . Viagra contains Sildenefil Citrate which helps a man to sustain an erection during sexual stimulation. When the muscles in the penis gets relaxed the blood flow in the penis increases which leads to a firm erection. Viagra increases sex drive, stamina & endurance and boosts sexual performance with fuller & harder erections. This magical pill has changed the sexual lives of almost 16 million people all over the world. 
There are some side effects of Viagra such as headache, nasal congestion, urinary tract infection, abnormal vision, facial and chest flushing, diarrhea, dizziness and rash. Though the symptoms of overdose in Viagra are not known if happens than it is likely that a man can have chest pain, dizziness, ankle or legs swelling and an irregular heartbeat, contact the doctor immediately.
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