Drug interactions
Pirbuterol + Thioridazine
Severity: Major
Pirbuterol 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 pirbuterol may cause hypokalemia and tachycardia, which increases the risk of torsades de pointes. The risk is greater with frequent or high-dose beta-agonist use.
What this interaction means in plain words
Pirbuterol 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.
Why it happens
Additive proarrhythmic effects: beta-agonist hypokalemia and tachycardia combined with thioridazine QT prolongation.
What to do
Check and correct potassium and magnesium, and obtain an ECG if pirbuterol is used regularly. Prefer a non-QT-prolonging antipsychotic where feasible.
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 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 Pirbuterol with Thioridazine?
MediHelp rates the interaction as major. Pirbuterol 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 pirbuterol may cause hypokalemia and tachycardia, which increases the risk of torsades de pointes. The risk is greater with frequent or high-dose beta-agonist use.
How serious is the interaction between Pirbuterol 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: Check and correct potassium and magnesium, and obtain an ECG if pirbuterol is used regularly. Prefer a non-QT-prolonging antipsychotic where feasible.
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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