Drug interactions between Anzemet and Zofran
| Results for the following 2 drugs: |
|---|
| Anzemet (dolasetron) |
| Zofran (ondansetron) |
Interactions between your selected drugs
ondansetron ↔ dolasetron
Applies to:Zofran (ondansetron) and Anzemet (dolasetron)
MONITOR CLOSELY: Dolasetron can cause dose-related prolongation of the QT interval via its pharmacologically active metabolite, hydrodolasetron. Theoretically, coadministration with other agents that can prolong the QT interval may result in additive effects and increased risk of ventricular arrhythmias including torsade de pointes and sudden death. In a study of 80 healthy adult subjects, maximum mean difference in QTcF from placebo after baseline-correction was 14.1 ms for the 100 mg dose and 36.6 ms for the supratherapeutic 300 mg dose of dolasetron administered intravenously. Dolasetron 300 mg once daily produced mean peak plasma concentration (Cmax) values of dolasetron mesylate and hydrodolasetron on day 4 that were approximately 3-fold higher than those observed with the therapeutic 100 mg dose. Based on exposure-response analysis in healthy volunteers, QTc interval prolongations appear to be associated with concentrations of hydrodolasetron. Using the established exposure-response relationship, the mean predicted increase in QTcF interval was 16.0 ms for renally impaired subjects and 17.9 ms for elderly subjects following an oral dose of 100 mg. In clinical trials, ECG interval prolongations usually returned to baseline within 6 to 8 hours after administration, but lasted more than 24 hours in some patients. In general, the risk of an individual agent or a combination of agents causing ventricular arrhythmia in association with QT prolongation is largely unpredictable but may be increased by certain underlying risk factors such as congenital long QT syndrome, cardiac disease, and electrolyte disturbances (e.g., hypokalemia, hypomagnesemia). In addition, the extent of drug-induced QT prolongation is dependent on the particular drug(s) involved and dosage(s) of the drug(s).
MANAGEMENT: Caution is recommended when dolasetron is administered concomitantly with drugs that prolong the QT interval (including cumulative high-dose anthracycline therapy), especially to patients with underlying risk factors. ECG monitoring may be appropriate in high-risk patients. Patients should be advised to seek medical attention if they experience symptoms that could indicate the occurrence of torsade de pointes such as dizziness, palpitations, irregular heartbeat, shortness of breath, or syncope.
See also...
Drug Interaction Classification
The classifications below are a guideline only. The relevance of a particular drug interaction to a specific patient is difficult to determine using this tool alone given the large number of variables that may apply.
| Major | Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit. |
| Moderate | Moderately clinically significant. Usually avoid combinations; use it only under special circumstances. |
| Minor | Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan. |
Do not stop taking any medications without consulting your healthcare provider.
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