Slate's Explainer is usually a good read and often has medical topics:
Technorati Tags: Priapism, Slate
At least 38 men who have taken Viagra have gone blind, and the drug's manufacturer said last Thursday that it would consider adding a warning to the label. Drug companies already warn consumers that Viagra and competitors like Levitra and Cialis have several other side effects, like blurred vision, headaches, indigestion, and painful erections that last four hours or more. What do you do with an erection that won't quit?
Call your doctor--and be very, very afraid... Priapism, a rare condition defined by prolonged erections in the absence of sexual arousal, is associated with certain blood diseases, hypertension, and recreational drug use. No matter what its cause, priapism can be dangerous if left untreated. A man who has a painful erection for more than 12 hours is at high risk for permanent damage...