Drug interactions
Diethylpropion + Thioridazine
Severity: Moderate
Diethylpropion 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
Diethylpropion is a sympathomimetic stimulant that may raise heart rate and blood pressure, while thioridazine prolongs the QT interval. Evidence for a direct interaction is limited and sedative effects may oppose each other.
What this interaction means in plain words
Diethylpropion 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
Opposing CNS effects and a possible additive cardiovascular burden; mechanism not established.
What to do
Monitor ECG, heart rate and blood pressure, especially with cardiac disease or electrolyte abnormalities. Consider an alternative to the stimulant.
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 Diethylpropion with Thioridazine?
MediHelp rates the interaction as moderate. Diethylpropion 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. Diethylpropion is a sympathomimetic stimulant that may raise heart rate and blood pressure, while thioridazine prolongs the QT interval. Evidence for a direct interaction is limited and sedative effects may oppose each other.
How serious is the interaction between Diethylpropion 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, heart rate and blood pressure, especially with cardiac disease or electrolyte abnormalities. Consider an alternative to the stimulant.
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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