Comparative Pharmacology
Head-to-head clinical analysis: CAPOZIDE 25 15 versus MAXZIDE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CAPOZIDE 25 15 versus MAXZIDE.
CAPOZIDE 25/15 vs MAXZIDE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Combination of captopril (ACE inhibitor) and hydrochlorothiazide (thiazide diuretic). Captopril inhibits angiotensin-converting enzyme, reducing angiotensin II formation, decreasing vasoconstriction and aldosterone secretion. Hydrochlorothiazide inhibits sodium reabsorption in the distal convoluted tubule, increasing diuresis and reducing plasma volume.
Maxzide is a combination of triamterene, a potassium-sparing diuretic that inhibits sodium reabsorption in the distal renal tubule, and hydrochlorothiazide, a thiazide diuretic that inhibits sodium and chloride reabsorption in the distal convoluted tubule. The combination reduces electrolyte disturbances.
Oral: 1 tablet (captopril 25 mg / hydrochlorothiazide 15 mg) once daily initially; titrate to a maximum of 2 tablets twice daily based on blood pressure response.
Hydrochlorothiazide 25 mg / triamterene 37.5 mg orally once daily; may increase to twice daily if needed. Max dose: hydrochlorothiazide 50 mg / triamterene 75 mg daily.
None Documented
None Documented
Captopril: ~2 hours (terminal) in normal renal function; increases to 20-60 hours in severe renal impairment. Hydrochlorothiazide: 6-15 hours (terminal), prolonged in renal impairment.
Triamterene: terminal half-life is approximately 4-6 hours in healthy individuals, but may be prolonged in renal impairment. Hydrochlorothiazide: terminal half-life is approximately 6-15 hours, and it accumulates in renal dysfunction. The combination product's effective half-life is influenced by both components.
Captopril: 95% renally excreted, primarily as unchanged drug and metabolites (disulfide dimers). Hydrochlorothiazide: at least 95% renally excreted as unchanged drug.
Renal: triamterene and hydrochlorothiazide are primarily excreted by the kidneys. Triamterene is extensively metabolized; about 20-30% of the dose is excreted unchanged in urine, with additional metabolites. Hydrochlorothiazide is excreted unchanged in urine (at least 61% of an oral dose within 24 hours).
Category C
Category C
ACE Inhibitor and Diuretic Combination
Diuretic Combination