Drug interactions
Domperidone + Polyethylene Glycol 3350
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.
Overview
Excessive use of polyethylene glycol 3350 can cause diarrhea-related electrolyte loss (e.g., hypokalemia), which increases domperidone-associated QT prolongation and torsades de pointes risk.
Mechanism of action
Pharmacodynamic: Electrolyte abnormalities (especially hypokalemia/hypomagnesemia) potentiate domperidone’s QT-prolonging effects; no meaningful pharmacokinetic interaction expected.
Clinical management
Avoid excessive laxative use; if persistent diarrhea occurs, check and correct potassium/magnesium before or during domperidone therapy. Consider ECG monitoring in high-risk patients. Hold domperidone or reduce/stop PEG 3350 if electrolyte disturbances or cardiac symptoms develop.
Drug reference
References
- Domperidone - Summary of Product Characteristics (SmPC): Warnings and precautions (cardiac effects, electrolyte disturbances) — EMA
- Domperidone: risks of cardiac side effects—restricted indication, contraindications, and dose and duration advice — MHRA Drug Safety Update
- Polyethylene glycol 3350: Drug Information (adverse effects, diarrhea and rare electrolyte disturbances) — Lexicomp
Frequently asked questions
Can I take Domperidone with Polyethylene Glycol 3350?
The interaction is rated: Moderate. Excessive use of polyethylene glycol 3350 can cause diarrhea-related electrolyte loss (e.g., hypokalemia), which increases domperidone-associated QT prolongation and torsades de pointes risk.
How serious is the interaction between Domperidone and Polyethylene Glycol 3350?
The interaction is rated: Moderate. Evidence level: Moderate.
How is the interaction between Domperidone and Polyethylene Glycol 3350 managed?
Avoid excessive laxative use; if persistent diarrhea occurs, check and correct potassium/magnesium before or during domperidone therapy. Consider ECG monitoring in high-risk patients. Hold domperidone or reduce/stop PEG 3350 if electrolyte disturbances or cardiac symptoms develop.
Why do Domperidone and Polyethylene Glycol 3350 interact?
Pharmacodynamic: Electrolyte abnormalities (especially hypokalemia/hypomagnesemia) potentiate domperidone’s QT-prolonging effects; no meaningful pharmacokinetic interaction expected.
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