Understanding Your Options
GeneSight vs. Trial-and-Error Prescribing: What to Know
By Dr. Stacey Forbes, DNP, APRN, PMHNP-BC
Key Takeaways
- Traditional prescribing often involves trial-and-error — trying medications one at a time to see what works.
- GeneSight is a pharmacogenomic (DNA) test that flags how you may metabolize certain psychiatric medications.
- GeneSight is a guide, not a guarantee — it informs, but doesn’t dictate, prescribing.
- It can be most useful for people who’ve had side effects or poor responses to multiple medications.
Finding the right psychiatric medication has traditionally meant trial-and-error. Pharmacogenomic testing like GeneSight aims to reduce that guesswork — but it’s important to understand what it can and can’t do.
How trial-and-error prescribing works
Traditionally, a provider selects a medication based on your symptoms and history, then adjusts over weeks based on your response and side effects. It’s effective for many people, but it can take time and several tries to find the right fit.
What GeneSight adds
GeneSight analyzes genes (via a simple cheek swab) that affect how your body processes many psychiatric medications — for example, genes in the CYP450 enzyme family. The report groups medications by how your genetics may influence metabolism, which can inform selection and dosing.
The honest limits
GeneSight is a guide, not a guarantee. It doesn’t tell you exactly which medication will work — it flags metabolism considerations that a clinician combines with your full clinical picture. It’s one tool in a personalized approach, not a replacement for clinical judgment.
When it’s most useful
Testing tends to add the most value for people who’ve tried medications that didn’t work or caused side effects, or those with treatment-resistant depression or anxiety. Dr. Forbes interprets results in context and helps you decide whether testing is worthwhile.
Common Questions
Does GeneSight tell you exactly which medication to take?
No — it’s a guide, not a guarantee. It flags metabolism considerations that a clinician combines with your clinical picture to personalize prescribing.
Who benefits most from GeneSight?
People who’ve had side effects or poor responses to multiple medications, or treatment-resistant depression or anxiety, tend to benefit most.
How is the test done?
A simple cheek swab, which can be arranged without an in-person visit; Dr. Forbes reviews the results with you by telehealth.
Sources & Further Reading
Explore Related Care
Learn how Dr. Stacey Forbes, DNP, PMHNP-BC, approaches GeneSight Testing at Willow & Stone — integrative, cash-pay telehealth care. Book a consultation →
Dr. Stacey Forbes, DNP, APRN, PMHNP-BC
Board-certified Psychiatric-Mental Health Nurse Practitioner and founder of Willow & Stone Integrative Mental Health. Nearly two decades of clinical experience; integrative, root-cause psychiatry via telehealth. Licensed in Texas & New Mexico.
About Dr. Forbes →