Wiktionary
procainamide
n. (context medicine English) A derivative of procaine that is used to treat cardiac arrhythmia
Wikipedia
Procainamide
Procainamide INN (; trade names Pronestyl, Procan, Procanbid) is a pharmaceutical antiarrhythmic agent used for the medical treatment of cardiac arrhythmias, classified by the Vaughan Williams classification system as class Ia.