Summer is a bad time to guess
In most places, a medicine that makes you dizzy or sweaty is an annoyance. In a Phoenix July, it can be dangerous. Patients at our downtown Phoenix, Scottsdale, and Mesa offices often bring a long history: an antidepressant that left them lightheaded at a bus stop on Central Avenue, another that did nothing for four months, a third that worked until it did not. When the list gets that long, it is worth asking whether your body handles these medicines differently from most people. GeneSight, a lab test made by Myriad Genetics, is one way to ask.
Enzymes, genes, and speed
Most psychiatric medicines are cleared by enzymes in your liver. Your genes set how quickly those enzymes work. GeneSight examines a cheek-swab sample for variants in genes including CYP2D6 and CYP2C19. A person with slow variants can end up with far more medicine in their blood than expected from an ordinary dose. A person with ultra-fast variants can clear a medicine before it has a chance to work.
What lands in your hands
The lab returns a color-coded report. Each medicine sits in one of three columns based on predicted gene-drug interactions, from no expected issue to a significant one. A medicine in the red column is still allowed. It simply tells your provider to think twice: choose something else, start smaller, or check in sooner.
Good reasons to test
- At least two depression or anxiety medicines have already let you down
- Normal doses brought side effects most people do not get
- You are on a long medicine list, common among Scottsdale and Mesa retirees, and interactions worry your doctors
If you have never taken a psychiatric medicine, a standard first choice usually works, and testing can wait.
A fair reading of the research
The GUIDED trial, one of the largest studies of this test, found that patients whose care used GeneSight results reached response and remission more often. It did not hit its main target for average symptom change. Independent pharmacogenetic experts publish dosing advice for several antidepressants based on CYP2D6 and CYP2C19 status, which your provider follows. Testing tips the odds; it does not hand you a guaranteed answer.
What the report leaves out
It does not diagnose depression, anxiety, or anything else. It cannot name the one medicine that will work, and it has no FDA approval as a tool for picking antidepressants. That is why it always rides alongside a full psychiatric evaluation and your own goals.
Older adults and stacked prescriptions
Snowbirds and full-time retirees often take medicines from a cardiologist, a primary care doctor, and a specialist or two. Several of those medicines use the same liver enzymes as antidepressants. Pairing a GeneSight report with a full medicine review can help your provider avoid combinations that pile up in your system, and the report can be shared with your other doctors if you agree.
A Mesa example
Imagine a teacher in Dobson Ranch who felt shaky and nauseated on two antidepressants at starter doses, worse once summer arrived. A report might show she clears those medicines slowly through CYP2D6, so even small doses ran high. Her provider could switch to a medicine that leaves the body through a different enzyme, or begin lower and climb slowly.
Keeping it private
Your results live in your protected medical record. A federal law from 2008, the Genetic Information Nondiscrimination Act, keeps most employers from using genetic results to decide who is hired, promoted, or let go.
When testing can wait
If you have tried only one medicine for a few weeks, your provider will usually suggest a proper trial first. You will get a straight answer about whether a test is likely to change anything now.
Getting started
Ask at any of our three offices. The swab takes about a minute, and your provider goes through the report with you when it comes back, then builds it into medication management. Visit our offices at 2 N Central Ave in downtown Phoenix, 7150 E Camelback Rd in Scottsdale, and 2266 S Dobson Rd in Mesa. Become a patient to begin.
Why Choose Rise Higher Psychiatry and Mental Health?
- Now accepting new patients across the Phoenix metro and all of Arizona - no 3-month waitlists
- Board-certified psychiatric providers, not just therapists
- We take most major insurance, plus Medicare — and keep costs transparent
- Real evaluations, not 10-minute med checks