Comparative Pharmacology
Head-to-head clinical analysis: HYDRALAZINE HYDROCHLORIDE W HYDROCHLOROTHIAZIDE 50 50 versus HYDROFLUMETHIAZIDE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: HYDRALAZINE HYDROCHLORIDE W HYDROCHLOROTHIAZIDE 50 50 versus HYDROFLUMETHIAZIDE.
HYDRALAZINE HYDROCHLORIDE W/ HYDROCHLOROTHIAZIDE 50/50 vs HYDROFLUMETHIAZIDE
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.
Hydroflumethiazide 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 promoting diuresis. It also causes vasodilation by reducing peripheral vascular resistance.
1 tablet (hydralazine 50 mg/hydrochlorothiazide 50 mg) orally twice daily, maximum 2 tablets daily.
Oral: 25-50 mg once daily; may increase to 100 mg/day in divided doses if needed.
None Documented
None Documented
Clinical Note
moderateHydroflumethiazide + Digoxin
"The risk or severity of adverse effects can be increased when Hydroflumethiazide is combined with Digoxin."
Clinical Note
moderateHydroflumethiazide + Digitoxin
"The risk or severity of adverse effects can be increased when Hydroflumethiazide is combined with Digitoxin."
Clinical Note
moderateHydroflumethiazide + Deslanoside
"The risk or severity of adverse effects can be increased when Hydroflumethiazide 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 of 6-9 hours in patients with normal renal function; clinically, this supports once-daily dosing in hypertension but may require twice-daily dosing in some patients with impaired renal function
Hydralazine: 80% renal (mainly as metabolites, 1-2% unchanged), 10% fecal. Hydrochlorothiazide: >95% renal (unchanged) via organic anion transporters.
Primarily renal (approximately 85% as unchanged drug via glomerular filtration and tubular secretion); minor biliary/fecal elimination (<10%)
Category A/B
Category C
Thiazide Diuretic
Thiazide Diuretic
Hydroflumethiazide + Acetyldigitoxin
"The risk or severity of adverse effects can be increased when Hydroflumethiazide is combined with Acetyldigitoxin."