Search Genesight testing. You will find links for patients, and doctors. Based on your Gene's, you'll submit a swab, they can tell which meds your body will metabolize well and which you won't. If you can't metabolize a certain drug you won't benefit from taking it
Your doctor must register with Genesight. It's free and it takes about 15 minutes. If your doctor doesn't want to do this, (they can be stubborn or just to busy), they will furnish a list of doctors based on your zipcode. That doctor will explain your results and give you a copy of your report that you can have entered into your medical record. This test is most useful for selecting psychotropic and analgesic medications. Most insurance and Medicare will cover it. I found it to be a very valuable service.