encainide
en·cai·nide
noun \en-ˈkā-ˌnīd\Definition of ENCAINIDE
: an antiarrhythmic drug C22H28N2O2 withdrawn from use when it was shown to increase mortality in patients who had a recent heart attack prior to receiving the drug
Seen & Heard 
What made you want to look up encainide? Please tell us where you read or heard it (including the quote, if possible).
