Drug interactions
Hydrochlorothiazide + Magnesium chloride
Severity: Minor
Hydrochlorothiazide and Magnesium chloride: 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
Hydrochlorothiazide increases urinary magnesium loss and can cause hypomagnesemia with long-term use. Magnesium supplements may offset this rather than cause harm, so this is more a pharmacologic opposition than a hazard.
What this interaction means in plain words
Hydrochlorothiazide and Magnesium chloride have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Thiazides increase renal magnesium excretion, lowering serum magnesium.
What to do
Monitor serum magnesium in long-term thiazide users and adjust magnesium supplementation to the measured level.
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
Frequently asked questions
Can I take Hydrochlorothiazide with Magnesium chloride?
MediHelp rates the interaction as minor. Hydrochlorothiazide and Magnesium chloride 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 increases urinary magnesium loss and can cause hypomagnesemia with long-term use. Magnesium supplements may offset this rather than cause harm, so this is more a pharmacologic opposition than a hazard.
How serious is the interaction between Hydrochlorothiazide and Magnesium chloride?
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 serum magnesium in long-term thiazide users and adjust magnesium supplementation to the measured level.
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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