Drug interactions
Memantine-donepezil + Pentobarbital
Severity: Moderate
Memantine-donepezil and Pentobarbital: 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
Pentobarbital is an inducer of CYP3A4 and may lower donepezil concentrations, reducing its effect. Barbiturate sedation may also worsen cognition in patients with dementia.
What this interaction means in plain words
Memantine-donepezil and Pentobarbital 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.
Why it happens
Induction of CYP3A4-mediated donepezil metabolism.
What to do
Monitor for reduced cognitive benefit and increased sedation. Consider an alternative sedative, and adjust donepezil if response drops.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Memantine-donepezil and Pentobarbital, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
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 Memantine-donepezil with Pentobarbital?
MediHelp rates the interaction as moderate. Memantine-donepezil and Pentobarbital 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. Pentobarbital is an inducer of CYP3A4 and may lower donepezil concentrations, reducing its effect. Barbiturate sedation may also worsen cognition in patients with dementia.
How serious is the interaction between Memantine-donepezil and Pentobarbital?
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 for reduced cognitive benefit and increased sedation. Consider an alternative sedative, and adjust donepezil if response drops.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
