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    Does losartan deplete magnesium? Separate the ARB from diuretics

    Losartan is an angiotensin receptor blocker, not a magnesium-wasting diuretic. The inspected guidance does not establish routine magnesium depletion from losartan alone. Combination tablets, other medicines, kidney function and laboratory findings can change the assessment.

    Read the evidence ↓

    Supplement Science Insights Editorial Team

    Published September 23, 2026

    Not all blood-pressure drugs handle minerals the same way

    NIH describes magnesium loss with loop and thiazide diuretics and reduced excretion with some potassium-sparing diuretics. Losartan belongs to a different drug class. Those diuretic findings should not be assigned to it simply because it also treats high blood pressure. [1][2]

    Check for a second medicine in the tablet

    A medication list may contain both an ARB and a diuretic, whether separately or in a combination product. The exact active ingredients matter when reviewing a low magnesium result. Naming only the best-known ingredient can conceal a different explanation. [1][2]

    Potassium advice is not magnesium advice

    NHS specifically cautions about potassium-containing supplements and salt substitutes with losartan. A mixed electrolyte product may contain both potassium and magnesium, so a magnesium-focused question can miss the relevant ingredient. Do not substitute one mineral concern for another. [2]

    Testing and kidney function guide the decision

    NHS describes blood tests and blood-pressure checks during losartan treatment. A low magnesium result deserves evaluation of intake, losses, other drugs and health conditions; an unconfirmed depletion claim is not a reason for automatic supplementation. Impaired kidney function can instead raise the risk from added magnesium. [2][1]

    Review the actual regimen

    Imagine someone taking losartan and a thiazide sees a low magnesium result. The shared treatment purpose does not establish which factor caused it. Bring the complete medicine list and results for assessment, and keep prescribed treatment unchanged unless the treating team advises otherwise. [2][1]

    Hypothetical example — review a hypothetical depletion claim
    ItemDistinction
    LosartanAn ARB
    Thiazide or loop diureticCan increase magnesium loss
    Electrolyte blendMay also contain potassium
    Low laboratory resultNeeds a cause-specific assessment
    Does losartan deplete magnesium? Separate the ARB from diuretics — original article outline diagram
    Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

    Sources for this article

    1. Magnesium - Health Professional Fact Sheet
      Source consulted: 2026-09-21. This is a reference resource, not a claim that we conducted the studies or tested a product.
    2. Losartan: medicine for high blood pressure - NHS
      Source consulted: 2026-09-21. This is a reference resource, not a claim that we conducted the studies or tested a product.