A 66-year-old Colombian farmer had his p enis amputated after he over used Viagra to impress his new girlfriend. He had an erection for several days and the doctors found his penis inflamed and fractured with signs of gangrene. So the doctors amputated it to prevent the gangrene from spreading to other body parts.
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This is where drugs like Viagra come in.
It is the most widely used drugs to treat erectile dysfunction and the go to drug for long lasting erections.
Still, there are some things you need to know if you have been using it or plan to start:

Viagra can affect your vision. According to a study, the active ingredient in Viagra – called sildenafil, interferes with the action of an enzyme which transmits light signals from the retina to the brain. So, in high doses, the drug can cause disturbances in the vision of active users and excessive use may cause blurred vision, altered colour vision and sensitivity to light. An 86-year-old man sued for $2million claiming that he lost his vision after using Viagra from 2012.
Viagra can cause penile injury. Believe it or not, using the drug can cause a man penile injury, not because the drug is ineffective, but because of misuse. For example, overdosing can cause extreme erections while using the drug and not having sex eventually can create painful erections. It was reported that a 66-year-old Colombian farmer had his penis amputated after he over used Viagra to impress his new girlfriend. He had an erection for several days and the doctors found his penis inflamed and fractured with signs of gangrene. So the doctors amputated it to prevent the gangrene from spreading to other body parts.
Viagra can curb menstrual cramps. Good news! Women suffering menstrual cramps may find relief by consuming Viagra according to research which showed that sildenafil citrate tends to dilate blood vessels and helps in relieving, continue

source >> http://spicyblogz..com/2015/11/dear-men-5-things-you-should-know.html