Comparative Pharmacology
Head-to-head clinical analysis: CHLOROTHIAZIDE versus HYDRALAZINE AND HYDROCHLOROTHIAZIDE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CHLOROTHIAZIDE versus HYDRALAZINE AND HYDROCHLOROTHIAZIDE.
CHLOROTHIAZIDE vs HYDRALAZINE AND HYDROCHLOROTHIAZIDE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Chlorothiazide inhibits the Na+-Cl- symporter in the distal convoluted tubule, reducing sodium and chloride reabsorption and promoting diuresis. It also causes vasodilation by reducing peripheral vascular resistance.
Hydralazine is a direct-acting smooth muscle vasodilator that relaxes arterioles, reducing peripheral resistance. Hydrochlorothiazide is a thiazide diuretic that inhibits the sodium-chloride symporter in the distal convoluted tubule, increasing excretion of sodium and water.
500 mg to 1000 mg orally or intravenously once or twice daily.
Oral: 1 tablet (hydralazine 25 mg / hydrochlorothiazide 25 mg) 1-2 times daily. Maximum: hydralazine 200 mg/day, hydrochlorothiazide 50 mg/day.
None Documented
None Documented
Clinical Note
moderateHydrochlorothiazide + Digoxin
"The risk or severity of adverse effects can be increased when Hydrochlorothiazide is combined with Digoxin."
Clinical Note
moderateChlorothiazide + Digoxin
"The risk or severity of adverse effects can be increased when Chlorothiazide is combined with Digoxin."
Clinical Note
moderateHydrochlorothiazide + Digitoxin
"The risk or severity of adverse effects can be increased when Hydrochlorothiazide is combined with Digitoxin."
Clinical Note
moderateTerminal half-life: 45–120 minutes (prolonged in renal impairment); clinical context: short duration requires frequent dosing
Hydralazine: 2-4 hours (fast acetylators), 4-8 hours (slow acetylators); extended in renal impairment. Hydrochlorothiazide: 6-15 hours; prolonged in renal impairment.
Renal: ~95% (tubular secretion); Fecal: <5%
Hydralazine: 80-90% renal (mostly as metabolites), <10% unchanged. Hydrochlorothiazide: 95-99% renal (unchanged).
Category C
Category A/B
Thiazide Diuretic
Thiazide Diuretic
Chlorothiazide + Digitoxin
"The risk or severity of adverse effects can be increased when Chlorothiazide is combined with Digitoxin."