Drug interactions
Clofazimine + Gemtuzumab
Severity: Moderate
Clofazimine and Gemtuzumab: 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 have been associated with prolongation of the QT interval. Used together they may add to the risk of ventricular arrhythmias, including torsades de pointes, especially in patients with electrolyte disturbances or underlying heart disease.
What this interaction means in plain words
Clofazimine and Gemtuzumab 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.
Why it happens
Additive pharmacodynamic QT prolongation through effects on cardiac repolarization.
What to do
Obtain a baseline ECG and repeat it during co-treatment, and correct potassium, magnesium and calcium before and during therapy. Reconsider the combination if QTc becomes markedly prolonged.
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 Clofazimine
Frequently asked questions
Can I take Clofazimine with Gemtuzumab?
MediHelp rates the interaction as moderate. Clofazimine and Gemtuzumab 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 have been associated with prolongation of the QT interval. Used together they may add to the risk of ventricular arrhythmias, including torsades de pointes, especially in patients with electrolyte disturbances or underlying heart disease.
How serious is the interaction between Clofazimine and Gemtuzumab?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Obtain a baseline ECG and repeat it during co-treatment, and correct potassium, magnesium and calcium before and during therapy. Reconsider the combination if QTc becomes markedly prolonged.
What other medicines interact with Clofazimine?
MediHelp also lists interactions of Clofazimine with, for example, Adagrasib, Amisulpride, Azithromycin. The full list is on the Clofazimine page.
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