A chap i know about 35, took some viagra, and ended up with a throbbing erection, that didnt go down,after a few hours it started to hurt, he eventually got admited to hospitial via a and e, and it was a chance he may have needed an amputation due to gangreen setting in.
Priapism
Priapism is painful, and is a medical emergency because the blood stuck in the penis can become thick and form clots. This can damage the blood vessels of the penis and lead to erectile dysfunction (ED). In serious cases the tissues of the penis can die, and the penis may have to be amputated (cut off) so that the tissue death does not spread to the rest of the body
Tell him/yourself to be very careful