Drug interactions
Chlorpromazine + Norepinephrine
Severity: Moderate
Chlorpromazine and Norepinephrine: 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
Chlorpromazine blocks alpha-1 receptors and can reduce the pressor response to norepinephrine, so higher doses may be needed to maintain blood pressure. Both drugs can also affect cardiac rhythm, and norepinephrine may provoke arrhythmias in patients on QT-prolonging agents.
What this interaction means in plain words
Chlorpromazine and Norepinephrine 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
Pharmacodynamic antagonism at alpha-adrenergic receptors, with additive arrhythmia potential.
What to do
Titrate norepinephrine to blood pressure response with continuous hemodynamic and ECG monitoring. Be prepared to need higher infusion rates than usual.
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 Chlorpromazine
- Chlorpromazine + Dofetilide Contraindicated
- Chlorpromazine + Dronedarone Contraindicated
- Chlorpromazine + Droperidol Contraindicated
- Chlorpromazine + Ibutilide Contraindicated
- Chlorpromazine + Metrizamide Contraindicated
- Chlorpromazine + Panobinostat Contraindicated
Frequently asked questions
Can I take Chlorpromazine with Norepinephrine?
MediHelp rates the interaction as moderate. Chlorpromazine and Norepinephrine 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. Chlorpromazine blocks alpha-1 receptors and can reduce the pressor response to norepinephrine, so higher doses may be needed to maintain blood pressure. Both drugs can also affect cardiac rhythm, and norepinephrine may provoke arrhythmias in patients on QT-prolonging agents.
How serious is the interaction between Chlorpromazine and Norepinephrine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Titrate norepinephrine to blood pressure response with continuous hemodynamic and ECG monitoring. Be prepared to need higher infusion rates than usual.
What other medicines interact with Chlorpromazine?
MediHelp also lists interactions of Chlorpromazine with, for example, Dofetilide, Dronedarone, Droperidol. The full list is on the Chlorpromazine page.
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