Drug interactions
Dobutamine + Thioridazine
Severity: Major
Dobutamine and Thioridazine: major 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 markedly prolongs the QT interval and is associated with torsades de pointes, while dobutamine increases heart rate, can cause ventricular ectopy and may lower serum potassium. Combined use may raise the risk of life-threatening ventricular arrhythmias.
What this interaction means in plain words
Dobutamine and Thioridazine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Dobutamine belongs to Cardiovascular; Thioridazine belongs to Central Nervous System.
Why it happens
Additive proarrhythmic effects: thioridazine QT prolongation with catecholamine-induced arrhythmogenesis and potential hypokalemia.
What to do
Avoid if feasible; if dobutamine is essential, use continuous ECG monitoring and keep potassium and magnesium in the normal range.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Dobutamine
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 Dobutamine with Thioridazine?
MediHelp rates the interaction as major. Dobutamine and Thioridazine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Thioridazine markedly prolongs the QT interval and is associated with torsades de pointes, while dobutamine increases heart rate, can cause ventricular ectopy and may lower serum potassium. Combined use may raise the risk of life-threatening ventricular arrhythmias.
How serious is the interaction between Dobutamine and Thioridazine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid if feasible; if dobutamine is essential, use continuous ECG monitoring and keep potassium and magnesium in the normal range.
What other medicines interact with Dobutamine?
MediHelp also lists interactions of Dobutamine with, for example, Budesonide-formoterol, Dihydroergotamine intranasal, Dihydroergotamine. The full list is on the Dobutamine page.
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