Drug interactions
Ciprofloxacin + Olanzapine
Severity: Moderate
Ciprofloxacin and Olanzapine: 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
Both drugs can prolong the QT interval, so combined use may add to the risk of arrhythmia, although olanzapine carries a relatively low QT liability. Ciprofloxacin also inhibits CYP1A2, which can raise olanzapine levels and increase sedation or other adverse effects.
What this interaction means in plain words
Ciprofloxacin and Olanzapine 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; Olanzapine belongs to Central Nervous System.
Why it happens
Additive QT prolongation, plus ciprofloxacin inhibition of CYP1A2-mediated olanzapine metabolism.
What to do
Monitor ECG and electrolytes in patients with additional QT risk factors, and watch for increased sedation or hypotension from olanzapine. Reduce the olanzapine dose if adverse effects emerge.
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 Olanzapine
Frequently asked questions
Can I take Ciprofloxacin with Olanzapine?
MediHelp rates the interaction as moderate. Ciprofloxacin and Olanzapine 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. Both drugs can prolong the QT interval, so combined use may add to the risk of arrhythmia, although olanzapine carries a relatively low QT liability. Ciprofloxacin also inhibits CYP1A2, which can raise olanzapine levels and increase sedation or other adverse effects.
How serious is the interaction between Ciprofloxacin and Olanzapine?
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 ECG and electrolytes in patients with additional QT risk factors, and watch for increased sedation or hypotension from olanzapine. Reduce the olanzapine dose if adverse effects emerge.
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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