Drug interactions
Butabarbital + Memantine-donepezil
Severity: Minor
Butabarbital and Memantine-donepezil: 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
Butabarbital is an inducer of hepatic enzymes and may speed up the breakdown of donepezil, the CYP3A4 substrate in this combination product. Donepezil exposure may fall and its cognitive benefit may be reduced. The effect is probably small in most patients.
What this interaction means in plain words
Butabarbital and Memantine-donepezil have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Barbiturate-mediated induction of CYP3A4 increases donepezil metabolic clearance.
What to do
Monitor cognitive and functional response if butabarbital is started or stopped. Adjust the donepezil dose only if loss of effect is evident.
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
Frequently asked questions
Can I take Butabarbital with Memantine-donepezil?
MediHelp rates the interaction as minor. Butabarbital and Memantine-donepezil have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Butabarbital is an inducer of hepatic enzymes and may speed up the breakdown of donepezil, the CYP3A4 substrate in this combination product. Donepezil exposure may fall and its cognitive benefit may be reduced. The effect is probably small in most patients.
How serious is the interaction between Butabarbital and Memantine-donepezil?
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 if butabarbital is started or stopped. Adjust the donepezil dose only if loss of effect is evident.
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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