Drug interactions
Isoproterenol + Pimozide
Severity: Moderate
Isoproterenol and Pimozide: 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
Isoproterenol is a beta-agonist that increases heart rate and can provoke ventricular arrhythmias. In a patient on pimozide, which prolongs the QT interval, tachycardia and hypokalemia from beta stimulation may raise proarrhythmic risk, while the sedation effect is not clinically important.
What this interaction means in plain words
Isoproterenol and Pimozide 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.
Isoproterenol belongs to Respiratory; Pimozide belongs to Central Nervous System.
Why it happens
Beta-adrenergic stimulation with hypokalemia and tachycardia may add to pimozide-induced QT prolongation.
What to do
Monitor ECG and serum potassium during isoproterenol therapy in patients on pimozide. Correct electrolyte disturbances promptly.
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 Pimozide
- Adagrasib + Pimozide Contraindicated
- Amiodarone + Pimozide Contraindicated
- Amisulpride + Pimozide Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amoxapine + Pimozide Contraindicated
- Anagrelide + Pimozide Contraindicated
Other interactions of Isoproterenol
Frequently asked questions
Can I take Isoproterenol with Pimozide?
MediHelp rates the interaction as moderate. Isoproterenol and Pimozide 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. Isoproterenol is a beta-agonist that increases heart rate and can provoke ventricular arrhythmias. In a patient on pimozide, which prolongs the QT interval, tachycardia and hypokalemia from beta stimulation may raise proarrhythmic risk, while the sedation effect is not clinically important.
How serious is the interaction between Isoproterenol and Pimozide?
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 serum potassium during isoproterenol therapy in patients on pimozide. Correct electrolyte disturbances promptly.
What other medicines interact with Pimozide?
MediHelp also lists interactions of Pimozide with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Pimozide page.
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