In March 2008, in a pre-emptive move, Merck announced that its allergy/asthma drug, Singulair, might cause some people to act on suicidal thoughts. They didn't have any scientific evidence yet, but anecdotal evidence from patients had been coming in. The risk was serious enough that they felt they should let the public know. However, the FDA decided not to take it off the market or even issue a black box warning until the issue could be studied more closely.
Over the past few months, that's...
