Ever wondered why a medication that helps someone else does nothing for you — or causes side effects? Your genes hold the answer. Here is how PGx testing works.
Two people can take the exact same medication at the exact same dose and have completely different experiences — one gets relief, the other gets side effects or nothing at all. Much of that difference is written in your DNA. Pharmacogenomic (PGx) testing reads the genes that control how you metabolize medications, so you and your provider can choose the right drug and dose the first time instead of trial and error.
What is pharmacogenomic (PGx) testing?
PGx testing analyzes specific genes — including well-studied ones like CYP2D6 and CYP2C19 — that produce the enzymes responsible for breaking down many common medications. Your genetic variants determine whether you process a given drug slowly, normally, or rapidly, which directly affects how much active medication ends up in your system.
Why does drug metabolism matter?
If you metabolize a medication too slowly, a standard dose can build up and cause side effects. If you metabolize it too quickly, the same dose may clear before it can work. PGx testing helps explain — and prevent — both scenarios. It is especially valuable for:
- Antidepressants and psychiatric medications, where finding the right fit can otherwise take months of trial and error.
- Cardiovascular drugs, including blood thinners where dosing precision is critical.
- Pain management, where metabolism affects both relief and safety.
Is PGx a one-time test?
Yes — and that is what makes it so valuable. Your genes do not change, so a single PGx test delivers insights you can use for the rest of your life. Every time you or your provider consider a new medication, your existing report can inform the decision. It is one of the few tests you truly only need once.
How do I get a PGx test?
Our pharmacogenomics testing service uses a simple sample collection and delivers a personalized medication-response report in 2–3 weeks. The test is CLIA-certified and HSA/FSA eligible. You keep the report and can share it with any provider, anywhere.
Keeping your results current
PGx science advances constantly — new gene-drug interactions are published regularly. While your DNA never changes, the interpretation of it improves over time. Wellness Labs members receive updated reports as new medical data becomes available, so your genetic insights stay current for life. Learn more about PGx testing and take control of your medication decisions.
Written by
Lab Director Team