Personalized Psychiatry: How Genetic Testing Can Improve Your Medication Plan

At Cassidy Psychiatry, we believe in combining clinical expertise with the latest advances in precision medicine to offer you the best possible care. One such tool is genetic (pharmacogenomic) testing — a way to gain insight into how your body might respond to different medications. This post explains what that is, how it can help, and important considerations to keep in mind.

Why the “one size fits all” approach often falls short

When treating conditions like depression, anxiety, mood disorders, ADHD and more, medications are often a key component of care. However:

• Many patients go through a trial-and-error process of trying different medications before finding one that works and is tolerable.
• Variability in how your body metabolizes, responds to, or tolerates a medication can be influenced by your genes (among other factors).
• Side-effects, delayed responses, or non-response can all prolong the path to relief and increase frustration.

What Is Genetic (Pharmacogenomic) Testing And How Does It Work

Genetic testing for medications (often called pharmacogenomic testing or “PGx”) involves analyzing a person’s genetic variants that affect drug metabolism (pharmacokinetics) and drug action (pharmacodynamics). For psychiatric medications this may include genes involved in the CYP450 enzymes (for how drugs are processed) and others related to drug targets or transporters. NCBI+3PMC+3Lippincott Journals+3

In practical terms:

• A sample (blood, cheek swab, or saliva) is collected and sent to a laboratory for analysis. NAMI+1
• The lab reports back which genetic variants you carry and how these may affect the medications your provider prescribes (e.g., you may be a slow metabolizer of drug X, or likely to have a less robust response to drug Y based on gene Z). PMC+1
• Your provider uses this information in conjunction with your clinical history, symptoms, side-effects, other medications, and preferences — in other words, it adds a layer of biologic personalization to your medication plan.

How Cassidy Psychiatry Uses Genetic Testing

When you come to Cassidy Psychiatry and a genetic test is indicated (for example, if you’ve had multiple medication trials, side-effects, or uncertain response), here’s how we incorporate it:

• At an appointment, your provider will discuss whether genetic testing may make sense for your situation — including benefits, limitations, cost and insurance implications.
• If yes, we order the test, collect the sample, and the lab processes it.
• Once results are ready, your provider reviews the report with you: which medications (or dosages) may be more optimal, which may be less ideal, or require closer monitoring.
• Then we adjust or select medications together based on these insights, with ongoing follow-up to monitor effectiveness and side-effects.
• Importantly: genetic testing doesn’t replace clinical judgment — it supports it. Your history, the clinical scenario, lifestyle, other medications, and your preferences all matter.

What The Research Says

There is a growing body of evidence supporting the use of pharmacogenomic testing in psychiatry. Some key findings:

• A major randomized clinical trial (1,944 patients with major depressive disorder) found that pharmacogenomic-guided treatment significantly reduced prescribing of medications with predicted drug-gene interactions compared to usual care; remission rates were modestly higher (though not at all time-points) in the guided group. JAMA Network
• A narrative review from 2024 notes that current evidence supports the use of some gene tests (especially for CYP2D6 and CYP2C19) when prescribing antidepressants and antipsychotics, but also emphasises that evidence is still evolving. PubMed+1
• Another review suggests pharmacogenomic testing “may help achieve better patient outcomes” especially in patients with depression who have not responded to at least one antidepressant. PsychiatryOnline
• A study indicates that genetic testing can help reduce early medication switching, improve medication adherence, and reduce costs in some settings. PMC+1

This means: the promise is real, especially when traditional treatment paths have been challenging, but genetic testing is not yet a universal guarantee of success.

What This Means For You (And What It Doesn’t)

What it can do:

• Give your provider additional biological information to help select medications more efficiently.
• Potentially reduce the chance of prescribing a medication that your body is less likely to respond to or more likely to cause side-effects.
• Improve your sense of being heard and understood — especially if you’ve been through multiple medication trials without success.

What it doesn’t do:

• It is not a test to diagnose a mental health condition. It doesn’t say “this medication will absolutely work for you.” NAMI+1
• It cannot guarantee remission of symptoms. Genetic factors are just one piece of the puzzle — your environment, lifestyle, other treatments, concurrent conditions all play major roles.
• It does not eliminate the need for clinical follow-up, monitoring, and sometimes medication adjustment.
• Evidence is still building; some studies show modest benefit and more research is needed for broad implementation. The Pharmaceutical Journal+1

When To Talk About It With Your Provider

When considering genetic testing, some questions to ask include:

• Which genes does this test analyze and how will results inform my medication plan?
• What is the out-of-pocket cost, and will my insurance cover it?
• How will the results be integrated into my care — who will explain them, and how will my treatment plan change (if at all)?
• What are the limitations of the test in my specific situation (other medical conditions, other medications, pregnancy, kidney/liver issues)?
• How frequently will we review my treatment and adjust based on real-world outcomes regardless of test results?

Why Cassidy Psychiatry?

At Cassidy Psychiatry, our mission is to bring you compassionate, evidence-informed care that adapts to your unique story. By integrating tools like genetic testing into our practice, we aim to reduce the frustration of trial-and-error, enhance medication effectiveness, and support you in reaching your mental-health goals more confidently and quickly.

If you’ve felt stuck, tried multiple medications without full success, or simply want a more personalized approach — let’s talk about whether genetic testing may benefit you.

Ready To Learn More?

Schedule a consultation with us at Cassidy Psychiatry to discuss whether genetic testing is right for you. Let’s work together to tailor your psychiatric treatment based on you — not just what works in general.