Drug class·Diuretics·Reviewed June 9, 2026
Diuretics and supplements: electrolytes in both directions.
Loop and thiazide diuretics waste potassium and magnesium; potassium-sparing diuretics do the opposite and turn potassium supplements into a hyperkalemia risk. Same class, opposite advice, which is exactly why the tables below are per drug.
Diuretics at a glance.
A quick, data-grounded summary. The per-drug tables are below.
Across the 5 diuretics in the NutriStack database (Hydrochlorothiazide, Chlorthalidone, Furosemide, Spironolactone, and Torsemide), 15 substances have a documented interaction, 1 of them flagged to avoid or as a serious conflict. Long-term use of some medications in this class is also associated with lower Magnesium, Potassium, Sodium, and Calcium; the depletion table shows exactly which drugs. Interactions are documented per drug, and members of a class do not all behave the same, so check your exact medication below. None of this replaces your prescriber's advice.
The diuretics we track.
Open any medication for its own full interaction and depletion guide.
Substances that interact with diuretics.
Merged across the class, highest severity first. The 'Documented for' column shows which members carry the interaction record; an absent drug means no documented record, not proven safety.
| Substance | Interaction | Documented for | What happens |
|---|---|---|---|
| Potassium | Conflict | All 5 diuretics | Spironolactone: Spironolactone is a potassium-sparing diuretic that blocks aldosterone. Adding potassium supplements creates very high hyperkalemia risk,... |
| Alcohol | Caution | Hydrochlorothiazide, Chlorthalidone, Furosemide | Hydrochlorothiazide: Hydrochlorothiazide lowers blood pressure partly through natriuresis and reduced plasma volume. Alcohol can potentiate orthostatic... |
| Calcium | Caution | Hydrochlorothiazide, Chlorthalidone | Hydrochlorothiazide: Hydrochlorothiazide reduces urinary calcium excretion and can raise serum calcium. Adding high-dose calcium supplements can increase the... |
| L-Arginine | Caution | Hydrochlorothiazide, Chlorthalidone | Hydrochlorothiazide: L-Arginine can lower blood pressure through nitric-oxide-mediated vasodilation. Hydrochlorothiazide is an antihypertensive diuretic, so... |
| L-Citrulline | Caution | Hydrochlorothiazide, Chlorthalidone | Hydrochlorothiazide: L-Citrulline can increase arginine availability and modestly lower systolic blood pressure. Hydrochlorothiazide also lowers blood... |
| Lithium | Caution | Hydrochlorothiazide, Furosemide | Hydrochlorothiazide: Thiazide diuretics reduce lithium clearance by 25-40%, significantly increasing the risk of lithium toxicity. This is one of the most... |
| Vitamin D2 | Caution | Hydrochlorothiazide, Chlorthalidone | Hydrochlorothiazide: Hydrochlorothiazide reduces urinary calcium excretion, and Vitamin D2 can increase calcium absorption after conversion to active vitamin D... |
| Vitamin D3 | Caution | Hydrochlorothiazide, Chlorthalidone | Hydrochlorothiazide: Hydrochlorothiazide can raise serum calcium by reducing urinary calcium loss, while Vitamin D3 increases intestinal calcium absorption.... |
| Lisinopril | Caution | Spironolactone | Both ACE inhibitors and spironolactone increase serum potassium through different mechanisms. Combined use significantly increases the... |
| Metformin | Caution | Furosemide | Furosemide can cause volume depletion and renal impairment, which increases the risk of metformin-associated lactic acidosis. This is... |
| Magnesium Glycinate | Synergy | Hydrochlorothiazide, Chlorthalidone, Furosemide +1 more | Hydrochlorothiazide: HCTZ increases renal magnesium excretion, and chronic use can lead to hypomagnesemia. Magnesium depletion can worsen potassium depletion... |
| Magnesium Citrate | Synergy | Hydrochlorothiazide, Chlorthalidone, Furosemide | Hydrochlorothiazide: Hydrochlorothiazide can increase renal magnesium excretion during chronic therapy. Magnesium citrate may help replace magnesium if levels... |
| Magnesium Malate | Synergy | Hydrochlorothiazide, Chlorthalidone, Furosemide | Hydrochlorothiazide: Hydrochlorothiazide may gradually lower magnesium status by increasing urinary losses. Magnesium malate can help replenish magnesium when... |
| Magnesium Taurate | Synergy | Hydrochlorothiazide, Chlorthalidone, Furosemide | Hydrochlorothiazide: Hydrochlorothiazide can produce chronic magnesium wasting, and magnesium taurate provides magnesium that may help restore stores. This is... |
| Vitamin B1 | Synergy | Furosemide | Long-term furosemide therapy can increase urinary thiamine loss and has been linked with biochemical Vitamin B1 deficiency, especially in... |
What diuretics can deplete.
Nutrients associated with long-term use somewhere in this class, worst documented severity first. Discuss any replacement with your prescriber.
| Nutrient | Severity | Documented for | Replace with | Monitor |
|---|---|---|---|---|
| Magnesium | Significant | Hydrochlorothiazide, Chlorthalidone, Furosemide +1 more | Magnesium Glycinate | Serum magnesium or RBC magnesium |
| Potassium | Significant | Hydrochlorothiazide, Chlorthalidone, Furosemide +1 more | Clinician-guided potassium repletion if serum potassium is low | Serum potassium + kidney function |
| Sodium | Moderate | Hydrochlorothiazide, Chlorthalidone, Furosemide | – | Serum sodium |
| Calcium | Moderate | Furosemide | Calcium | Serum calcium |
| Thiamine | Moderate | Furosemide | Vitamin B1 | Whole blood thiamine |
| Zinc | Mild | Hydrochlorothiazide, Chlorthalidone, Furosemide | Zinc Picolinate | Serum zinc |
| CoQ10 | Mild | Hydrochlorothiazide, Chlorthalidone | Coenzyme Q10 | Plasma CoQ10 |
Common diuretics questions.
Quick answers drawn from the tables above.
What supplements should I avoid with diuretics?
Across the class, 1 substance pairing is flagged to avoid or as a serious conflict, including Potassium. The exact risk depends on which medication in the class you take, so check your specific drug's page and confirm with your prescriber.
Do all diuretics interact with supplements the same way?
No. Interactions are documented per drug, and the 5 diuretics in the database differ in how they are absorbed and cleared. The class table above shows which members carry each record; a drug without a record is undocumented, not proven safe.
Do diuretics deplete any nutrients?
Some medications in this class are documented to lower Magnesium, Potassium, Sodium, Calcium, and Thiamine with long-term use; the depletion table on this page shows which specific drugs carry each record. Useful biomarkers to monitor include Serum magnesium or RBC magnesium, Serum potassium + kidney function, and Serum sodium. Ask your prescriber before adding a replacement supplement.
Is it safe to take Potassium with diuretics?
NutriStack classifies the Potassium and Spironolactone pairing as conflict: Spironolactone is a potassium-sparing diuretic that blocks aldosterone. Adding potassium supplements creates very high hyperkalemia risk, which can cause fatal cardiac... The interaction is documented for 5 of the 5 diuretics, and severity differs by drug. Always confirm with your prescriber.
Check your whole stack
See how your medication fits your supplements.
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