viagra doesn't help with libido. it will help with ED
the health complications you can google, i always tell guys not to get started with ED meds, they can get habit forming. who wants to have to run to take a pill everytime the time is right? i mean come on.
As far as interactions go you would have to list any other meds you are taking. The primary effect of viagra is to dilate blood vessels. It primarily works on the blood vessels located in the penis but it can still act on other vessels throughout the body. So hypotension (low blood pressure) can result from using too high of a dose and you can feel faint when going from a seated to a standing position (postural hypotension) and some people do pass out from this. Also straining causes constriction of the vessels so using viagra while working out can cause dizziness as well. Usually, this is not the case unless the person is using other vasodilatory substances along with the viagra.