NutriStack
Furosemide and Magnesium Citrate, a synergy.
Furosemide can increase urinary magnesium loss during chronic therapy. Magnesium citrate may help replete magnesium when levels are low, but unmonitored replacement can be unsafe in kidney disease. Low magnesium can also make low potassium harder to correct and may contribute to cramps or arrhythmias.
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At a glance
- Substances
- Furosemide and Magnesium Citrate
- Pair type
- Synergy
- Evidence (highest tier)
- Moderate
- Source citations
- 3 sources
- Stack Score effect
- +2 to your Stack Score (per scored synergy row).
- Scope
- Supplement × Prescription
- Last verified
- May 30, 2026
Synergy · Moderate evidence
Synergy
What is happening. Furosemide can increase urinary magnesium loss during chronic therapy. Magnesium citrate may help replete magnesium when levels are low, but unmonitored replacement can be unsafe in kidney disease. Low magnesium can also make low potassium harder to correct and may contribute to cramps or arrhythmias.
Mechanism. Loop diuretics inhibit NKCC2 in the thick ascending limb, reducing the lumen-positive voltage that drives paracellular magnesium reabsorption. Supplemental magnesium citrate provides magnesium to replace renal losses.
Recommendation. If you use furosemide long term, ask for periodic magnesium and potassium checks. Use magnesium citrate for replacement only at reasonable doses and avoid high-dose use if you have reduced kidney function unless your prescriber is monitoring labs.
Sources (3)
- Brater DC. Diuretic therapy. N Engl J Med. 1998;339(6):387-395. PMID 9691107
- Mohn ES, Kern HJ, Saltzman E, Mitmesser SH, McKay DL. Evidence of Drug-Nutrient Interactions with Chronic Use of Commonly Prescribed Medications: An Update. Pharmaceutics. 2018;10(1):36. PMID 29558445
- Dai LJ, Ritchie G, Kerstan D, Kang HS, Cole DE, Quamme GA. Magnesium transport in the renal distal convoluted tubule. Physiol Rev. 2001;81(1):51-84. PMID 11152754
Stack Score
How this pair moves the number.
Effect on the composite score
If both Furosemide and Magnesium Citrate are in the same stack, this pair applies +2 to your Stack Score (per scored synergy row).
The full algorithm, the clamping rules, and four worked stacks are documented at /methodology/stack-score.
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