Drug interactions
Ciprofloxacin + Donepezil
Severity: Moderate
Ciprofloxacin and Donepezil: 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
Donepezil can prolong the QT interval and has been linked to torsades de pointes, and ciprofloxacin may add to this effect. Older patients, those with bradycardia, or those with electrolyte disturbances are at greater risk.
What this interaction means in plain words
Ciprofloxacin and Donepezil 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.
Ciprofloxacin belongs to Anti Bacterial; Donepezil belongs to Central Nervous System.
Why it happens
Additive prolongation of ventricular repolarization through potassium channel effects, with donepezil also contributing vagotonic bradycardia.
What to do
Check electrolytes and consider a baseline ECG in at-risk patients. Monitor for syncope, palpitations or bradycardia and choose another antibiotic if risk factors are present.
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 Ciprofloxacin
- Agomelatine + Ciprofloxacin Contraindicated
- Ciprofloxacin + Fezolinetant Contraindicated
- Ciprofloxacin + Thioridazine Contraindicated
- Ciprofloxacin + Tizanidine Contraindicated
- Ciprofloxacin + Vandetanib Contraindicated
- Alosetron + Ciprofloxacin Major
Other interactions of Donepezil
- Donepezil + Dronedarone Contraindicated
- Donepezil + Pimozide Contraindicated
- Donepezil + Thioridazine Contraindicated
- Donepezil + Vandetanib Contraindicated
- Amiodarone + Donepezil Major
- Amisulpride + Donepezil Major
Frequently asked questions
Can I take Ciprofloxacin with Donepezil?
MediHelp rates the interaction as moderate. Ciprofloxacin and Donepezil 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. Donepezil can prolong the QT interval and has been linked to torsades de pointes, and ciprofloxacin may add to this effect. Older patients, those with bradycardia, or those with electrolyte disturbances are at greater risk.
How serious is the interaction between Ciprofloxacin and Donepezil?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check electrolytes and consider a baseline ECG in at-risk patients. Monitor for syncope, palpitations or bradycardia and choose another antibiotic if risk factors are present.
What other medicines interact with Ciprofloxacin?
MediHelp also lists interactions of Ciprofloxacin with, for example, Agomelatine, Fezolinetant, Thioridazine. The full list is on the Ciprofloxacin page.
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