Patients taking pergolide to help control movement in Parkinson’s disease have a much greater incidence of heart valve damage. : Investigators are recommending switching to a nonergot agonist “until the safety of pergolide can be firmly established.” says an article in Neurology magazine.

So many things we don’t know all the consequences of. Sometimes it must seem to investigators that they’re moving down a long narrow tunnel and can’t see other branches of the tunnel until they fall down one…