antiarrhythmic drug vs antiarrhythmic medication

antiarrhythmic drug and antiarrhythmic medication both are nouns.

Word	Noun	Adjective	Verb	Adverb
antiarrhythmic drug	Yes	No	No	No
antiarrhythmic medication	Yes	No	No	No

As nouns, antiarrhythmic drug and antiarrhythmic medication are synonyms defined as:

antiarrhythmic drug and antiarrhythmic medication: a drug used to treat an abnormal heart rhythm

Other synonyms of antiarrhythmic drug include antiarrhythmic.

antiarrhythmic drug (noun)	antiarrhythmic medication (noun)
a drug used to treat an abnormal heart rhythm	a drug used to treat an abnormal heart rhythm