antiarrhythmic vs antiarrhythmic medication

antiarrhythmic and antiarrhythmic medication both are nouns.

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

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

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

Other synonyms of antiarrhythmic include antiarrhythmic drug.

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