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
Hydrochlorothiazide
Losartan vs. Hydrochlorothiazide Dosage
Losartan
Hydrochlorothiazide
| 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 |
| 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
| 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
| 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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