Comparative Pharmacology
Head-to-head clinical analysis: CHLOROTHIAZIDE versus METAHYDRIN.
Peer-Reviewed Evidence
Head-to-head clinical analysis: CHLOROTHIAZIDE versus METAHYDRIN.
CHLOROTHIAZIDE vs METAHYDRIN
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.
Metahydrin (trichlormethiazide) is a thiazide diuretic that inhibits the sodium-chloride symporter (NCC) in the distal convoluted tubule of the nephron, reducing sodium and chloride reabsorption and increasing excretion of water, sodium, chloride, and potassium.
500 mg to 1000 mg orally or intravenously once or twice daily.
Oral, 50-100 mg once daily. Maximum 200 mg/day.
None Documented
None Documented
Terminal half-life: 45–120 minutes (prolonged in renal impairment); clinical context: short duration requires frequent dosing
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
moderate18-30 hours (clinically relevant for once-daily dosing in hypertension; prolonged in renal impairment)
Renal: ~95% (tubular secretion); Fecal: <5%
Renal: 30% (fecal: 70% as unabsorbed drug, primarily biliary elimination; <1% unchanged in urine)
Category C
Category C
Thiazide Diuretic
Thiazide Diuretic
Chlorothiazide + Digitoxin
"The risk or severity of adverse effects can be increased when Chlorothiazide is combined with Digitoxin."