Drug interactions
Chlorthalidone + Labetalol
Severity: Minor
Chlorthalidone and Labetalol: minor 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
The main effect of this combination is additive blood pressure lowering, which is usually desirable. Labetalol has no meaningful potassium-raising action that would reliably offset chlorthalidone-induced hypokalemia, so the potassium concern is minor. Orthostatic hypotension may occur.
What this interaction means in plain words
Chlorthalidone and Labetalol have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Chlorthalidone belongs to Cardiovascular; Labetalol belongs to Cardiovascular.
Why it happens
Additive antihypertensive effects through diuresis and combined alpha- and beta-adrenergic blockade.
What to do
Monitor blood pressure and orthostatic symptoms when starting or adjusting either drug. Check potassium periodically as is routine with thiazide-type diuretics.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Chlorthalidone
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 Chlorthalidone with Labetalol?
MediHelp rates the interaction as minor. Chlorthalidone and Labetalol have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. The main effect of this combination is additive blood pressure lowering, which is usually desirable. Labetalol has no meaningful potassium-raising action that would reliably offset chlorthalidone-induced hypokalemia, so the potassium concern is minor. Orthostatic hypotension may occur.
How serious is the interaction between Chlorthalidone and Labetalol?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure and orthostatic symptoms when starting or adjusting either drug. Check potassium periodically as is routine with thiazide-type diuretics.
What other medicines interact with Chlorthalidone?
MediHelp also lists interactions of Chlorthalidone with, for example, Amifostine, Atenolol-chlorthalidone, Candesartan-hydrochlorothiazide. The full list is on the Chlorthalidone page.
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