Bretylium tosylate Get Printable Handwriting Hear It! Say It! Write It! Learn It! Spelling Test Definition noun. a substance C18H24BrNO3S used to treat acute ventricular arrhythmias and suppress ventricular fibrillation Example Sentence The doctor prescribed Bretylium tosylate medicine. Synonyms antiarrhythmic drug; treatment of ventricular arrhythmia; drug Antonyms sickness Hear It! Say It! Write It! Bretylium tosylate Switch to cursive Start Share with your friends: