Drug interactions
Lithium + Pentamidine
Severity: Major
Lithium 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 prolong the QT interval and cause torsades de pointes, and lithium may add to this effect. Pentamidine may also cause hypoglycemia and electrolyte disturbances that further increase arrhythmia risk.
What this interaction means in plain words
Lithium 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.
Lithium belongs to Central Nervous System; Pentamidine belongs to Anti Parasitic.
Why it happens
Additive QTc prolongation, with electrolyte effects from pentamidine amplifying the risk.
What to do
Check a baseline ECG and electrolytes and monitor the ECG during pentamidine treatment. Correct potassium and magnesium, and consider an alternative anti-infective if possible.
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 Lithium
- Lithium + Thioridazine Contraindicated
- Lithium + Vandetanib Contraindicated
- Aceclofenac + Lithium Major
- Acemetacin + Lithium Major
- Amisulpride + Lithium Major
- Amlodipine-benazepril + Lithium Major
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 Lithium with Pentamidine?
MediHelp rates the interaction as major. Lithium 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 prolong the QT interval and cause torsades de pointes, and lithium may add to this effect. Pentamidine may also cause hypoglycemia and electrolyte disturbances that further increase arrhythmia risk.
How serious is the interaction between Lithium 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: Check a baseline ECG and electrolytes and monitor the ECG during pentamidine treatment. Correct potassium and magnesium, and consider an alternative anti-infective if possible.
What other medicines interact with Lithium?
MediHelp also lists interactions of Lithium with, for example, Thioridazine, Vandetanib, Aceclofenac. The full list is on the Lithium page.
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