Drug interactions
Memantine-donepezil + Rifabutin
Severity: Minor
Memantine-donepezil and Rifabutin: minor 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
Rifabutin induces CYP3A4 and can lower donepezil concentrations, possibly reducing its benefit. The inductive effect of rifabutin is weaker than that of rifampicin.
What this interaction means in plain words
Memantine-donepezil and Rifabutin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Memantine-donepezil belongs to Central Nervous System; Rifabutin belongs to Anti Bacterial.
Why it happens
CYP3A4 induction increases donepezil metabolism.
What to do
Monitor cognitive and functional response during and after rifabutin therapy. Consider a donepezil dose adjustment if benefit is lost.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Memantine-donepezil
- Dronedarone + Memantine-donepezil Contraindicated
- Memantine-donepezil + Thioridazine Contraindicated
- Amantadine + Memantine-donepezil Major
- Amiodarone + Memantine-donepezil Major
- Amisulpride + Memantine-donepezil Major
- Amitriptyline + Memantine-donepezil Major
Other interactions of Rifabutin
- Cabotegravir + Rifabutin Contraindicated
- Lorlatinib + Rifabutin Contraindicated
- Rifabutin + Voriconazole Contraindicated
- Apixaban + Rifabutin Major
- Axitinib + Rifabutin Major
- Brexpiprazole + Rifabutin Major
Frequently asked questions
Can I take Memantine-donepezil with Rifabutin?
MediHelp rates the interaction as minor. Memantine-donepezil and Rifabutin have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Rifabutin induces CYP3A4 and can lower donepezil concentrations, possibly reducing its benefit. The inductive effect of rifabutin is weaker than that of rifampicin.
How serious is the interaction between Memantine-donepezil and Rifabutin?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor cognitive and functional response during and after rifabutin therapy. Consider a donepezil dose adjustment if benefit is lost.
What other medicines interact with Memantine-donepezil?
MediHelp also lists interactions of Memantine-donepezil with, for example, Dronedarone, Thioridazine, Amantadine. The full list is on the Memantine-donepezil page.
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