Drug interactions
Gemifloxacin + Pentamidine
Severity: Major
Gemifloxacin 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 gemifloxacin adds further risk. The combination may precipitate serious ventricular arrhythmias, especially with electrolyte disturbance.
What this interaction means in plain words
Gemifloxacin 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.
Gemifloxacin belongs to Anti Bacterial; Pentamidine belongs to Anti Parasitic.
Why it happens
Additive pharmacodynamic QT prolongation through blockade of cardiac repolarizing currents.
What to do
Avoid concurrent use where an alternative antibiotic exists. If both are required, check ECG at baseline and during therapy and correct potassium and magnesium.
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 Gemifloxacin
- Arsenic trioxide + Gemifloxacin Contraindicated
- Dofetilide + Gemifloxacin Contraindicated
- Gemifloxacin + Ibutilide Contraindicated
- Gemifloxacin + Pimozide Contraindicated
- Gemifloxacin + Thioridazine Contraindicated
- Gemifloxacin + Vandetanib Contraindicated
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 Gemifloxacin with Pentamidine?
MediHelp rates the interaction as major. Gemifloxacin 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 gemifloxacin adds further risk. The combination may precipitate serious ventricular arrhythmias, especially with electrolyte disturbance.
How serious is the interaction between Gemifloxacin 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 where an alternative antibiotic exists. If both are required, check ECG at baseline and during therapy and correct potassium and magnesium.
What other medicines interact with Gemifloxacin?
MediHelp also lists interactions of Gemifloxacin with, for example, Arsenic trioxide, Dofetilide, Ibutilide. The full list is on the Gemifloxacin page.
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