Genetic testing for ADHD medication: what your genes can and can’t show

Yes, but it shows less than many people hope. An ADHD medication genetic test is a pharmacogenomic (PGx) test: it reads genes that affect how your body processes some medicines. For ADHD, published CPIC guidance uses a gene for one medicine only, and for none of the stimulants.^[1]

So a result can help your prescriber with that one medicine. It can’t diagnose ADHD, and it can’t say which ADHD medicine will work for you.

Atomoxetine, a non-stimulant. The Clinical Pharmacogenetics Implementation Consortium (CPIC) has a guideline for it that uses one gene, CYP2D6, and lists the pair at level A, its highest.^[2][3] CYP2D6 makes an enzyme that breaks the medicine down. People whose CYP2D6 works slowly, called poor metabolizers, tend to have more of it in their blood, which the guideline links with more side effects.^[2]

Pharmacogenomic results describe how your body is likely to process certain medicines. They do not tell you whether a medicine will work for you, and they are not dosing instructions. Never start, stop or change a medication because of a genetic result. Bring it to the prescriber who manages your medicines.

The guideline is written for prescribers. It sets out how they can take a CYP2D6 result into account, alongside everything else they know about you.

The stimulants prescribed most often for ADHD have no CPIC prescribing guideline.^[1] That doesn’t mean genes play no part in how people respond to them. It means there is no published CPIC guidance a prescriber can use to act on a genetic result for them.

If a test says it can tell you which stimulant will suit you, ask which published guideline supports that claim.

GenePGx is for adults 18 and older. For a child or teenager, talk to their clinician about clinical pharmacogenomic testing.

For an adult, a report is most useful when you already take the non-stimulant or your prescriber is weighing it up. The same report covers other medicines with published guidance for the genes on its panel, so it can be useful beyond ADHD.

• Whether you have ADHD. No genetic test diagnoses ADHD, and a pharmacogenomic test doesn’t try to.
• Which ADHD medicine will work. It describes how you’re likely to process a medicine, not whether it will help.
• Anything the stimulants’ prescribing guidance can act on. With no CPIC guideline for them, there is no published CPIC advice a prescriber can apply to a result.
• The whole picture. Your other medicines, your health and how you have responded before all matter too. A genetic result is one piece of information among them.

Take the report to whoever prescribes your ADHD medicine. Some questions to start with:

• Does my CYP2D6 result matter for any medicine I take now?
• If you are thinking about the non-stimulant for me, how would you use this result?
• Is there anything else in the report you would want to look at?

GenePGx is our pharmacogenomic test, from one saliva sample collected at home. Checks selected known variants in 15 genes, plus CYP2D6 copy number, by genotyping. CYP2D6 is one of those genes, so your report shows your CYP2D6 result and what published guidance says about the medicines that use it. It tests genes named in CPIC prescribing guidelines for 56 medicines (checked September 29, 2026).

To look up a single medicine, use the Medication Check. If you also take medicines for depression or anxiety, the mental health DNA test page covers those.