Drug interactions
Benzphetamine + Thioridazine
Severity: Moderate
Benzphetamine 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
Benzphetamine is a sympathomimetic stimulant that may oppose thioridazine's sedation and raise heart rate and blood pressure. Thioridazine's QT-prolonging potential makes stimulant-induced tachycardia and arrhythmia a concern.
What this interaction means in plain words
Benzphetamine 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 pharmacodynamic effects on CNS and cardiovascular activity; the precise mechanism is not established.
What to do
Monitor blood pressure, heart rate and ECG, particularly in patients with cardiac disease or other QT risk factors.
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 Benzphetamine with Thioridazine?
MediHelp rates the interaction as moderate. Benzphetamine 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. Benzphetamine is a sympathomimetic stimulant that may oppose thioridazine's sedation and raise heart rate and blood pressure. Thioridazine's QT-prolonging potential makes stimulant-induced tachycardia and arrhythmia a concern.
How serious is the interaction between Benzphetamine 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 blood pressure, heart rate and ECG, particularly in patients with cardiac disease or other QT risk factors.
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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