Drug interactions
Hydrochlorothiazide + Magnesium sulphate
Severity: Minor
Hydrochlorothiazide and Magnesium sulphate: 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
Thiazide diuretics promote urinary magnesium loss and can cause hypomagnesemia with chronic use. This may counteract magnesium supplementation and contribute to arrhythmia risk alongside hypokalemia.
What this interaction means in plain words
Hydrochlorothiazide and Magnesium sulphate 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; Magnesium sulphate belongs to Cardiovascular.
Why it happens
Thiazides reduce distal tubular magnesium reabsorption, increasing renal excretion.
What to do
Check serum magnesium and potassium periodically in patients on long-term thiazides and supplement if low.
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 Magnesium sulphate
- Amikacin + Magnesium sulphate Moderate
- Amphotericin b deoxycholate + Magnesium sulphate Moderate
- Atracurium + Magnesium sulphate Moderate
- Baloxavir marboxil + Magnesium sulphate Moderate
- Ciprofloxacin + Magnesium sulphate Moderate
- Cisatracurium + Magnesium sulphate Moderate
Other interactions of Hydrochlorothiazide
Frequently asked questions
Can I take Hydrochlorothiazide with Magnesium sulphate?
MediHelp rates the interaction as minor. Hydrochlorothiazide and Magnesium sulphate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Thiazide diuretics promote urinary magnesium loss and can cause hypomagnesemia with chronic use. This may counteract magnesium supplementation and contribute to arrhythmia risk alongside hypokalemia.
How serious is the interaction between Hydrochlorothiazide and Magnesium sulphate?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Check serum magnesium and potassium periodically in patients on long-term thiazides and supplement if low.
What other medicines interact with Magnesium sulphate?
MediHelp also lists interactions of Magnesium sulphate with, for example, Amikacin, Amphotericin b deoxycholate, Atracurium. The full list is on the Magnesium sulphate page.
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