Drug interactions
dexlansoprazole + ondansetron
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
Chronic PPI therapy can cause hypomagnesemia, which increases ondansetron-associated QT prolongation/TdP risk, especially with other risk factors (low K/Mg, structural heart disease, high IV doses).
Mechanism of action
PPI-induced hypomagnesemia predisposes to ventricular arrhythmias; ondansetron blocks cardiac IKr (hERG) causing QT prolongation; electrolyte disturbances potentiate this effect.
Clinical management
If ondansetron is needed during chronic PPI use, check/correct Mg and K first; use lowest effective ondansetron dose (avoid high IV doses); obtain ECG in high-risk patients; consider alternative antiemetic if Mg cannot be corrected.
Drug reference
References
- Zofran (ondansetron) Prescribing Information — FDA Label
- Dexilant (dexlansoprazole) Prescribing Information — FDA Label
- Ondansetron — Known Risk of Torsades de Pointes — CredibleMeds
Frequently asked questions
Can I take dexlansoprazole with ondansetron?
The interaction is rated: Moderate. Chronic PPI therapy can cause hypomagnesemia, which increases ondansetron-associated QT prolongation/TdP risk, especially with other risk factors (low K/Mg, structural heart disease, high IV doses).
How serious is the interaction between dexlansoprazole and ondansetron?
The interaction is rated: Moderate. Evidence level: Moderate.
How is the interaction between dexlansoprazole and ondansetron managed?
If ondansetron is needed during chronic PPI use, check/correct Mg and K first; use lowest effective ondansetron dose (avoid high IV doses); obtain ECG in high-risk patients; consider alternative antiemetic if Mg cannot be corrected.
Why do dexlansoprazole and ondansetron interact?
PPI-induced hypomagnesemia predisposes to ventricular arrhythmias; ondansetron blocks cardiac IKr (hERG) causing QT prolongation; electrolyte disturbances potentiate this effect.
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