Losartan vs. Hydrochlorothiazide

See how Losartan and Hydrochlorothiazide compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Losartan is an ARB that blocks a hormone pathway to lower blood pressure and protect the kidneys in diabetes, while hydrochlorothiazide is a diuretic that lowers blood pressure by flushing out excess salt and water.

  • Both drugs are inexpensive once-daily generic tablets, and doctors often prescribe them together in a single combination pill since they work through different mechanisms.

  • Losartan carries added FDA approvals for stroke-risk reduction and diabetic kidney protection, while hydrochlorothiazide is also approved for edema and is sometimes used off-label to prevent kidney stones.

Losartan vs. Hydrochlorothiazide Drug Summary

Losartan

Losartan is an angiotensin II receptor blocker (ARB) used to treat high blood pressure, lower stroke risk in patients with hypertension and thickened heart muscle, and slow kidney damage from type 2 diabetes. It is taken as a tablet once a day, usually starting at 50 mg.

Hydrochlorothiazide

Hydrochlorothiazide is a thiazide diuretic, sometimes called a water pill, used to treat high blood pressure and reduce fluid buildup from heart failure, liver disease, or kidney problems. It is taken as a tablet once a day, typically starting at 25 mg.

Losartan vs. Hydrochlorothiazide Side Effects

Losartan

Most common
Upper respiratory infection (up to 8%)
Dizziness (up to 3%)
Nasal congestion (up to 2%)
Back pain (up to 2%)

Hydrochlorothiazide

Most common
Weakness (not specified)
Hypotension (not specified)
Hypokalemia (not specified)
Hyperglycemia (not specified)

Losartan vs. Hydrochlorothiazide Dosage

Losartan

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 25 mg once daily At the start
Maximum dose 100 mg once daily If needed
Dose changes 2 increases As tolerated

Hydrochlorothiazide

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 25 mg once daily At the start
Maximum dose 25-100 mg once daily If needed
Dose changes 2 increases As tolerated

Losartan vs. Hydrochlorothiazide Indications

Losartan

Losartan is approved to treat high blood pressure and also carries two specific add-on indications: reducing stroke risk in patients who have hypertension with left ventricular hypertrophy, and slowing the progression of kidney disease in type 2 diabetics with hypertension and protein in the urine.

  • High blood pressure (hypertension)

  • Stroke risk reduction in patients with hypertension and left ventricular hypertrophy

  • Slowing diabetic kidney disease (nephropathy) in type 2 diabetes with hypertension

  • Can be combined with diuretics or other antihypertensive drugs for added control

Hydrochlorothiazide

Hydrochlorothiazide is approved to treat high blood pressure, either alone or combined with other antihypertensives, and to reduce edema caused by heart failure, cirrhosis, kidney disease, or corticosteroid and estrogen therapy. It is also used off-label to help prevent calcium-containing kidney stones.

  • High blood pressure (hypertension), alone or with other drugs

  • Edema from heart failure, cirrhosis, or kidney disease

  • Edema from corticosteroid or estrogen therapy

  • Off-label: prevention of calcium-containing kidney stones

Losartan vs. Hydrochlorothiazide Pros and Cons

Losartan

Losartan targets the renin-angiotensin system directly and carries an FDA-approved indication for slowing diabetic kidney disease, something few other blood pressure pills offer. It's a once-daily tablet with a low side-effect burden, though it does not clear excess fluid the way a diuretic does.

Pros

  • FDA-approved to slow diabetic kidney disease in people with type 2 diabetes and hypertension

  • FDA-approved to lower stroke risk in patients with hypertension and thickened heart muscle

  • Does not deplete potassium or sodium the way a diuretic can

  • Not linked to the skin cancer or blood sugar risks seen with thiazide diuretics

Cons

  • Does not treat fluid retention or edema

  • Can raise potassium levels, so needs monitoring with supplements or other RAAS drugs

  • Not the right choice when a diuretic effect is specifically needed

  • Not approved for kidney stone prevention

Hydrochlorothiazide

Hydrochlorothiazide works by helping the kidneys release excess salt and water, making it useful for both blood pressure and fluid retention from heart, liver, or kidney conditions. It has a long track record spanning six decades, but requires periodic blood tests to catch electrolyte shifts.

Pros

  • FDA-approved for edema from heart failure, cirrhosis, and kidney disease, not just hypertension

  • Six decades of clinical use with a well-established safety track record

  • Often used off-label to help prevent calcium-based kidney stones

  • Works well combined with potassium-sparing diuretics or other antihypertensives

Cons

  • Can cause dose-related drops in potassium and sodium that need blood test monitoring

  • Long-term use is linked to a higher risk of non-melanoma skin cancer

  • Can raise blood sugar and uric acid levels

  • Not suitable for patients with no urine output or a sulfa allergy

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