Drug interactions
Olanzapine + Pentamidine
Severity: Major
Olanzapine and Pentamidine: major 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
Systemic pentamidine can cause QT prolongation and torsade de pointes, and olanzapine may add to this risk. Pentamidine can also cause hypoglycemia and electrolyte disturbances that increase arrhythmia risk.
What this interaction means in plain words
Olanzapine and Pentamidine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Olanzapine belongs to Central Nervous System; Pentamidine belongs to Anti Parasitic.
Why it happens
Additive QT prolongation, with electrolyte disturbance from pentamidine increasing susceptibility.
What to do
Avoid concurrent use of systemic pentamidine where possible. If needed, obtain an ECG and correct potassium and magnesium before and during therapy.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Olanzapine
Other interactions of Pentamidine
- Clomipramine + Pentamidine Contraindicated
- Desipramine + Pentamidine Contraindicated
- Dronedarone + Pentamidine Contraindicated
- Moxifloxacin + Pentamidine Contraindicated
- Nortriptyline + Pentamidine Contraindicated
- Pentamidine + Pimozide Contraindicated
Frequently asked questions
Can I take Olanzapine with Pentamidine?
MediHelp rates the interaction as major. Olanzapine and Pentamidine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Systemic pentamidine can cause QT prolongation and torsade de pointes, and olanzapine may add to this risk. Pentamidine can also cause hypoglycemia and electrolyte disturbances that increase arrhythmia risk.
How serious is the interaction between Olanzapine and Pentamidine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid concurrent use of systemic pentamidine where possible. If needed, obtain an ECG and correct potassium and magnesium before and during therapy.
What other medicines interact with Olanzapine?
MediHelp also lists interactions of Olanzapine with, for example, Amisulpride, Amoxapine, Apomorphine. The full list is on the Olanzapine page.
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