Be careful of side effects.

One guy developed elephantiasis of the cock; it grew tremendously and remained erect, so he was hospitalized.

He saw a spider on the ceiling and asked a nurse to kill it.

She had to climb up his pole to try to reach it but his engorged member was sweaty and every time she shimmied up a couple feet she lost her grip and slid back down.

This went on for five minutes, and the guy told her "Do that a couple more times and I can blast him off the ceiling."