Comparative Pharmacology
Head-to-head clinical analysis: HYDRALAZINE HYDROCHLORIDE W HYDROCHLOROTHIAZIDE 50 50 versus TRICHLORMETHIAZIDE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: HYDRALAZINE HYDROCHLORIDE W HYDROCHLOROTHIAZIDE 50 50 versus TRICHLORMETHIAZIDE.
HYDRALAZINE HYDROCHLORIDE W/ HYDROCHLOROTHIAZIDE 50/50 vs TRICHLORMETHIAZIDE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Hydralazine is a direct-acting vasodilator that relaxes arteriolar smooth muscle via mechanisms involving interference with calcium ion movement and possibly nitric oxide release. Hydrochlorothiazide is a thiazide diuretic that inhibits the sodium-chloride symporter in the distal convoluted tubule, reducing sodium and water reabsorption and decreasing plasma volume.
Inhibits sodium-chloride symporter in distal convoluted tubule, increasing excretion of sodium, chloride, and water.
1 tablet (hydralazine 50 mg/hydrochlorothiazide 50 mg) orally twice daily, maximum 2 tablets daily.
2-4 mg orally once daily; maximum 4 mg/day.
None Documented
None Documented
Clinical Note
moderateTrichlormethiazide + Digoxin
"The risk or severity of adverse effects can be increased when Trichlormethiazide is combined with Digoxin."
Clinical Note
moderateTrichlormethiazide + Digitoxin
"The risk or severity of adverse effects can be increased when Trichlormethiazide is combined with Digitoxin."
Clinical Note
moderateTrichlormethiazide + Deslanoside
"The risk or severity of adverse effects can be increased when Trichlormethiazide is combined with Deslanoside."
Clinical Note
moderateHydralazine: 2-8 hours (acetylator phenotype dependent; slow acetylators up to 8h, fast acetylators 1-2h). Hydrochlorothiazide: 6-15 hours (mean 10h).
Terminal elimination half-life is approximately 2-6 hours (average 3.5 h); clinical context: short half-life necessitates once or twice daily dosing for sustained diuresis.
Hydralazine: 80% renal (mainly as metabolites, 1-2% unchanged), 10% fecal. Hydrochlorothiazide: >95% renal (unchanged) via organic anion transporters.
Primarily renal (tubular secretion); ~70% excreted unchanged in urine; minor biliary/fecal (<10% total).
Category A/B
Category C
Thiazide Diuretic
Thiazide Diuretic
Trichlormethiazide + Acetyldigitoxin
"The risk or severity of adverse effects can be increased when Trichlormethiazide is combined with Acetyldigitoxin."