Drug interactions
Hydrochlorothiazide + Labetalol
Severity: Minor
Hydrochlorothiazide 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
Labetalol may slightly raise potassium while hydrochlorothiazide lowers it, so the net effect on potassium is small. The combination adds to blood pressure lowering and may cause orthostatic hypotension.
What this interaction means in plain words
Hydrochlorothiazide 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.
Hydrochlorothiazide belongs to Cardiovascular; Labetalol belongs to Cardiovascular.
Why it happens
Beta-blockade reduces cellular potassium uptake, modestly counteracting thiazide potassium loss, and both drugs have additive antihypertensive effects.
What to do
Monitor blood pressure and serum potassium periodically. Counsel patients about orthostatic symptoms.
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 Hydrochlorothiazide
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 Hydrochlorothiazide with Labetalol?
MediHelp rates the interaction as minor. Hydrochlorothiazide 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. Labetalol may slightly raise potassium while hydrochlorothiazide lowers it, so the net effect on potassium is small. The combination adds to blood pressure lowering and may cause orthostatic hypotension.
How serious is the interaction between Hydrochlorothiazide 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 serum potassium periodically. Counsel patients about orthostatic symptoms.
What other medicines interact with Hydrochlorothiazide?
MediHelp also lists interactions of Hydrochlorothiazide with, for example, Dofetilide, Amifostine, Amiodarone. The full list is on the Hydrochlorothiazide page.
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