As adjectives the difference between antipsychotic and antidepressant
is that
antipsychotic is (pharmacology) preventing or counteracting psychosis while
antidepressant is preventing or counteracting depression.
As nouns the difference between antipsychotic and antidepressant
is that
antipsychotic is (pharmacology) any of a group of drugs used to treat psychosis while
antidepressant is an agent that prevents or counteracts depression.