Drug interactions
Guanfacine + Oxcarbazepine
Severity: Moderate
Guanfacine and Oxcarbazepine: 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
Oxcarbazepine can reduce guanfacine concentrations, weakening its antihypertensive or ADHD effect. Its induction effect is milder than that of strong inducers but may still matter.
What this interaction means in plain words
Guanfacine and Oxcarbazepine 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; Oxcarbazepine belongs to Central Nervous System.
Why it happens
CYP3A4 induction by oxcarbazepine increases guanfacine metabolism.
What to do
Monitor blood pressure or ADHD symptom control and raise the guanfacine dose if response falls. Reduce the dose again if the inducer is stopped.
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 Oxcarbazepine
- Cabotegravir + Oxcarbazepine Contraindicated
- Oxcarbazepine + Rilpivirine Contraindicated
- Artemether / lumefantrine + Oxcarbazepine Major
- Atazanavir + Oxcarbazepine Major
- Benzhydrocodone / acetaminophen + Oxcarbazepine Major
- Bictegravir + Oxcarbazepine 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 Oxcarbazepine?
MediHelp rates the interaction as moderate. Guanfacine and Oxcarbazepine 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. Oxcarbazepine can reduce guanfacine concentrations, weakening its antihypertensive or ADHD effect. Its induction effect is milder than that of strong inducers but may still matter.
How serious is the interaction between Guanfacine and Oxcarbazepine?
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 blood pressure or ADHD symptom control and raise the guanfacine dose if response falls. Reduce the dose again if the inducer is stopped.
What other medicines interact with Oxcarbazepine?
MediHelp also lists interactions of Oxcarbazepine with, for example, Cabotegravir, Rilpivirine, Artemether / lumefantrine. The full list is on the Oxcarbazepine page.
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