antipsychotic agent vs antipsychotic drug

antipsychotic agent and antipsychotic drug both are nouns.

Word	Noun	Adjective	Verb	Adverb
antipsychotic agent	Yes	No	No	No
antipsychotic drug	Yes	No	No	No

As nouns, antipsychotic agent and antipsychotic drug are synonyms defined as:

antipsychotic agent and antipsychotic drug: tranquilizer used to treat psychotic conditions when a calming effect is desired

antipsychotic agent (noun)	antipsychotic drug (noun)
tranquilizer used to treat psychotic conditions when a calming effect is desired	tranquilizer used to treat psychotic conditions when a calming effect is desired