Comparative Pharmacology
Head-to-head clinical analysis: CAPTOPRIL AND HYDROCHLOROTHIAZIDE versus DIURIL.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CAPTOPRIL AND HYDROCHLOROTHIAZIDE versus DIURIL.
CAPTOPRIL AND HYDROCHLOROTHIAZIDE vs DIURIL
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Captopril is an angiotensin-converting enzyme (ACE) inhibitor that inhibits the conversion of angiotensin I to angiotensin II, resulting in vasodilation and decreased aldosterone secretion. Hydrochlorothiazide is a thiazide diuretic that inhibits the Na+/Cl- cotransporter in the distal convoluted tubule, increasing excretion of sodium and water.
Inhibits sodium reabsorption in the distal convoluted tubule by blocking the sodium-chloride symporter, leading to increased excretion of sodium, chloride, and water.
1 tablet (captopril 25 mg / hydrochlorothiazide 15 mg) orally once daily, titrated up to a maximum of 1 tablet (captopril 50 mg / hydrochlorothiazide 25 mg) twice daily.
Adults: 500 mg to 1000 mg orally once or twice daily; maximum 2000 mg per day.
None Documented
None Documented
Captopril: ~2 hours (prolonged to 6-8 hours in heart failure or renal impairment). Hydrochlorothiazide: 5.6-14.8 hours (mean ~9.6 hours; prolonged in renal impairment).
Terminal elimination half-life is 6-15 hours (mean 10 hours). In renal impairment, half-life can exceed 24 hours.
Captopril: renal (95%), primarily as unchanged drug and disulfide metabolites. Hydrochlorothiazide: renal (≥95%) as unchanged drug via tubular secretion.
Primarily renal (90-95% excreted unchanged via glomerular filtration and tubular secretion); minimal biliary/fecal (<5%).
Category A/B
Category C
Thiazide Diuretic
Thiazide Diuretic