Drug interactions
Dexfenfluramine + Thioridazine
Severity: Moderate
Dexfenfluramine and Thioridazine: 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
Thioridazine can cause dose-related QT prolongation and arrhythmia. Dexfenfluramine, a serotonergic anorectic, has no well-established interaction with it, so the effect is uncertain and may involve opposing sedative effects.
What this interaction means in plain words
Dexfenfluramine and Thioridazine 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
Mechanism not established; possible pharmacodynamic opposition of sedation and a theoretical contribution to arrhythmia risk.
What to do
Monitor ECG and electrolytes in patients with other QT risk factors. Reassess the need for the anorectic agent.
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 Thioridazine
- Abiraterone + Thioridazine Contraindicated
- Adagrasib + Thioridazine Contraindicated
- Amiodarone + Thioridazine Contraindicated
- Amisulpride + Thioridazine Contraindicated
- Amitriptyline + Thioridazine Contraindicated
- Amoxapine + Thioridazine Contraindicated
Frequently asked questions
Can I take Dexfenfluramine with Thioridazine?
MediHelp rates the interaction as moderate. Dexfenfluramine and Thioridazine 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. Thioridazine can cause dose-related QT prolongation and arrhythmia. Dexfenfluramine, a serotonergic anorectic, has no well-established interaction with it, so the effect is uncertain and may involve opposing sedative effects.
How serious is the interaction between Dexfenfluramine and Thioridazine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor ECG and electrolytes in patients with other QT risk factors. Reassess the need for the anorectic agent.
What other medicines interact with Thioridazine?
MediHelp also lists interactions of Thioridazine with, for example, Abiraterone, Adagrasib, Amiodarone. The full list is on the Thioridazine page.
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