Drug interactions
Hydrochlorothiazide + Metoprolol
Severity: Minor
Hydrochlorothiazide and Metoprolol: 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
Metoprolol may slightly raise potassium while hydrochlorothiazide lowers it, so the net effect is small. The combination is commonly used for hypertension, with additive blood pressure lowering and possible thiazide effects on glucose and lipids.
What this interaction means in plain words
Hydrochlorothiazide and Metoprolol 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; Metoprolol belongs to Cardiovascular.
Why it happens
Beta-blockade slightly reduces cellular potassium uptake, offsetting thiazide potassium loss, and both agents lower blood pressure by different mechanisms.
What to do
Monitor blood pressure, heart rate and serum potassium periodically. Monitor glucose in patients with diabetes.
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 Metoprolol
- Metoprolol + Thioridazine Contraindicated
- Amifostine + Metoprolol Major
- Amiodarone + Metoprolol Major
- Atenolol-chlorthalidone + Metoprolol Major
- Atenolol + Metoprolol Major
- Betaxolol + Metoprolol Major
Frequently asked questions
Can I take Hydrochlorothiazide with Metoprolol?
MediHelp rates the interaction as minor. Hydrochlorothiazide and Metoprolol have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Metoprolol may slightly raise potassium while hydrochlorothiazide lowers it, so the net effect is small. The combination is commonly used for hypertension, with additive blood pressure lowering and possible thiazide effects on glucose and lipids.
How serious is the interaction between Hydrochlorothiazide and Metoprolol?
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, heart rate and serum potassium periodically. Monitor glucose in patients with diabetes.
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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