Drug interactions
Guanfacine + Imatinib
Severity: Moderate
Guanfacine and Imatinib: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Imatinib inhibits CYP3A4, the main route of guanfacine metabolism, so its plasma levels may rise. This can cause hypotension, bradycardia and sedation.
What this interaction means in plain words
Guanfacine and Imatinib can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Guanfacine belongs to Cardiovascular; Imatinib belongs to Oncology.
Why it happens
Imatinib inhibits CYP3A4 metabolism of guanfacine.
What to do
Monitor heart rate, blood pressure and sedation, and reduce the extended-release guanfacine dose to half when it is combined with a CYP3A4 inhibitor.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Imatinib
- Imatinib + Lomitapide Contraindicated
- Imatinib + Lonafarnib Contraindicated
- Amobarbital + Imatinib Major
- Apalutamide + Imatinib Major
- Avapritinib + Imatinib Major
- Benzhydrocodone / acetaminophen + Imatinib Major
Other interactions of Guanfacine
- Clonidine + Guanfacine Major
- Guanfacine + Lofexidine Major
- Aldesleukin + Guanfacine Moderate
- Amiodarone + Guanfacine Moderate
- Amisulpride + Guanfacine Moderate
- Amitriptyline + Guanfacine Moderate
Frequently asked questions
Can I take Guanfacine with Imatinib?
MediHelp rates the interaction as moderate. Guanfacine and Imatinib can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Imatinib inhibits CYP3A4, the main route of guanfacine metabolism, so its plasma levels may rise. This can cause hypotension, bradycardia and sedation.
How serious is the interaction between Guanfacine and Imatinib?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor heart rate, blood pressure and sedation, and reduce the extended-release guanfacine dose to half when it is combined with a CYP3A4 inhibitor.
What other medicines interact with Imatinib?
MediHelp also lists interactions of Imatinib with, for example, Lomitapide, Lonafarnib, Amobarbital. The full list is on the Imatinib page.
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