What dna test shows if you need anxiety or depression meds ? thank you?

I know of no "DNA" test that would ever be accepted by a physician as a reason to prescribe any drug, much less controlled substances monitored by the feds. Such treatments are based on history, exam and a physicians clinical judgement. The record keeping for such treatments must stand up to auditing by various agencies. Some of these tests can show a "tendency" toward various problems.