Drug interactions
Labetalol + Norepinephrine
Severity: Major
Labetalol and Norepinephrine: 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
Labetalol's alpha and beta blockade can reduce the pressor effect of norepinephrine, so higher doses may be needed to maintain blood pressure. Unopposed effects may produce unpredictable blood pressure and heart rate responses.
What this interaction means in plain words
Labetalol and Norepinephrine 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
Pharmacodynamic antagonism at alpha and beta adrenergic receptors by labetalol opposes norepinephrine.
What to do
Titrate norepinephrine to blood pressure with continuous hemodynamic monitoring in patients on labetalol. Anticipate a need for higher doses or other vasopressors.
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 Labetalol
- Amifostine + Labetalol Major
- Amiodarone + Labetalol Major
- Atenolol-chlorthalidone + Labetalol Major
- Atenolol + Labetalol Major
- Betaxolol + Labetalol Major
- Bisoprolol + Labetalol Major
Frequently asked questions
Can I take Labetalol with Norepinephrine?
MediHelp rates the interaction as major. Labetalol and Norepinephrine 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. Labetalol's alpha and beta blockade can reduce the pressor effect of norepinephrine, so higher doses may be needed to maintain blood pressure. Unopposed effects may produce unpredictable blood pressure and heart rate responses.
How serious is the interaction between Labetalol and Norepinephrine?
MediHelp rates it major, 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 with continuous hemodynamic monitoring in patients on labetalol. Anticipate a need for higher doses or other vasopressors.
What other medicines interact with Labetalol?
MediHelp also lists interactions of Labetalol with, for example, Amifostine, Amiodarone, Atenolol-chlorthalidone. The full list is on the Labetalol page.
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