diuretic
9 interactions related to diuretic
hydrochlorothiazide + calcium
Thiazide diuretics such as hydrochlorothiazide increase the kidney's reabsorption of calcium and reduce how much calcium leaves the body in urine. This calcium-sparing effect is often beneficial, but combined with generous calcium supplements, high-dose vitamin D, or underlying parathyroid disease it can push blood calcium too high (hypercalcemia).
hydrochlorothiazide + magnesium
Thiazide diuretics such as hydrochlorothiazide increase urinary magnesium excretion, and a meaningful minority of long-term users become magnesium-depleted. Low magnesium also makes potassium hard to replace and can worsen muscle cramps and heart-rhythm risk.
hydrochlorothiazide + potassium
Hydrochlorothiazide promotes urinary potassium excretion at the distal convoluted tubule and is a common cause of drug-induced low potassium (hypokalemia). Many patients stay low even with food or supplements, while others on combination blood-pressure regimens face the opposite risk of high potassium if a potassium-sparing drug is added. Either direction can affect heart rhythm, so potassium should be supplemented only under medical guidance with blood monitoring.
alcohol + hydrochlorothiazide
Hydrochlorothiazide and alcohol both lower blood pressure and increase fluid loss, so taking them together can cause additive dizziness, lightheadedness on standing, and fainting. Both can also worsen loss of potassium and magnesium. The interaction is usually manageable at light drinking levels but becomes more significant in older adults, in hot weather, and during illness.
hibiscus tea + hydrochlorothiazide
Hibiscus tea and hydrochlorothiazide both lower blood pressure and act as mild diuretics, so together the effect can be additive on blood pressure and on potassium loss. Animal data also suggest hibiscus may raise hydrochlorothiazide blood levels by reducing its renal clearance, though this has not been confirmed in humans.
salt substitute + spironolactone
Most salt substitutes replace ordinary table salt with potassium chloride, so they act as concentrated potassium supplements. Spironolactone is a potassium-sparing diuretic that reduces how much potassium the kidneys excrete. Using the two together can drive potassium high enough to cause dangerous, sometimes life-threatening heart rhythm problems (hyperkalemia).
alcohol + magnesium
Alcohol acts as an acute magnesium diuretic, increasing urinary magnesium excretion within hours of intake. Regular and heavy drinking can deplete body magnesium stores through renal wasting combined with reduced intestinal absorption and poor diet, and low magnesium is common in chronic alcohol-use disorder.
bananas + spironolactone
Bananas are a well-known high-potassium food, and spironolactone is a potassium-sparing diuretic that makes the kidneys hold onto potassium. Eating large amounts of bananas (and other high-potassium foods) while taking spironolactone can push blood potassium too high (hyperkalemia), which in serious cases can disturb the heart's rhythm.
coconut water + spironolactone
Coconut water is naturally high in potassium and is often consumed in large volumes for hydration. Spironolactone is a potassium-sparing diuretic that reduces the kidneys' ability to excrete potassium. Regular high-volume coconut water consumption alongside spironolactone can raise blood potassium into a dangerous range (hyperkalemia), and at least one published case report links excessive coconut water plus spironolactone to life-threatening hyperkalemia.