Respuesta :

kristak0730
An erection that will not go away (priapism). 
Sudden vision loss in one or both eyes 
Sudden hearing decrease or hearing loss.
asaiahlloyd21
Viagra is used to stifle the messengers of cGMP. So that a male can sustain an erection.

Side effects can include headaches, stuffy nose, impaired vision, sensitivity to light, indigestion, and the possibility of a (painful)long lasting erection