This is general health information only and is not a substitute for advice from your GP or healthcare professional.
1. What is pharmacogenetics?
Pharmacogenetics is the study of how a person’s genetic differences affect their response to medicines. Genetic variations can influence how quickly a medication is absorbed, broken down, transported, or removed from the body, which can affect its effectiveness and risk of side effects.
2. How does pharmacogenetics work?
A genetic test identifies specific variations in genes involved in medication response. The results can help predict whether a person may metabolise certain medicines faster or slower than expected, allowing treatment to be selected or adjusted accordingly.
3. Which medicines can be affected by genetics?
Genetic differences can influence the response to a range of medicines, including some antidepressants, pain medicines, anticoagulants, and medicines used to treat cancer and other conditions. The usefulness of testing depends on the specific medicine and the available genetic evidence.
4. What is pharmacogenomic testing?
Pharmacogenomic testing is a broader term that examines how multiple genes may influence medication response. Pharmacogenetics is often used more specifically to describe the relationship between individual genetic variations and particular medicines, although the terms are sometimes used interchangeably.
5. How is pharmacogenetic testing performed?
Testing usually involves collecting a small blood or saliva sample. The laboratory analyses selected genes and reports genetic variants that may affect the response to particular medicines. The results are then interpreted alongside the person’s medical history and current medications.
6. Can pharmacogenetics help choose the right medication?
In some situations, yes. Pharmacogenetic information can help doctors select a medicine or dose that is more appropriate for a particular genetic profile. However, genetics is only one factor influencing treatment, and testing does not replace clinical assessment.
7. Can pharmacogenetics predict all medication side effects?
No. Genetic testing cannot predict every side effect or guarantee that a medicine will work. Medication response is also influenced by age, kidney and liver function, other medicines, medical conditions, lifestyle, and environmental factors.
8. Is pharmacogenetic testing useful for everyone?
Not necessarily. Testing is most useful when there is strong evidence that a particular genetic variation affects the response to a specific medicine. Routine testing for every medication is not currently recommended, and your doctor can determine whether testing is clinically appropriate.
9. Can my pharmacogenetic results change in the future?
Your genetic information generally remains stable throughout your lifetime. However, scientific understanding of particular genetic variants can change as new research becomes available. A result that is not considered clinically useful today may become more relevant as evidence develops.
10. When should I discuss pharmacogenetic testing with my doctor?
You may wish to discuss testing if you have experienced unexpected or severe medication side effects, have not responded to several medicines, or are being considered for a medicine for which pharmacogenetic testing is supported by clinical evidence. Your doctor can determine whether testing is likely to provide useful information for your treatment.