Comparative Pharmacology
Head-to-head clinical analysis: HYDRALAZINE HYDROCHLORIDE W HYDROCHLOROTHIAZIDE 50 50 versus INDERIDE 80 25.
Peer-Reviewed Evidence
Head-to-head clinical analysis: HYDRALAZINE HYDROCHLORIDE W HYDROCHLOROTHIAZIDE 50 50 versus INDERIDE 80 25.
HYDRALAZINE HYDROCHLORIDE W/ HYDROCHLOROTHIAZIDE 50/50 vs INDERIDE-80/25
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.
INDERIDE-80/25 is a combination of propranolol (a non-selective beta-adrenergic receptor antagonist) and hydrochlorothiazide (a thiazide diuretic). Propranolol blocks beta-1 and beta-2 adrenergic receptors, reducing heart rate, myocardial contractility, and renin release, thereby lowering blood pressure. Hydrochlorothiazide inhibits the sodium-chloride symporter in the distal convoluted tubule of the kidney, increasing excretion of sodium, chloride, and water, reducing plasma volume.
1 tablet (hydralazine 50 mg/hydrochlorothiazide 50 mg) orally twice daily, maximum 2 tablets daily.
One tablet (80 mg propranolol/25 mg hydrochlorothiazide) orally twice daily.
None Documented
None Documented
Hydralazine: 2-8 hours (acetylator phenotype dependent; slow acetylators up to 8h, fast acetylators 1-2h). Hydrochlorothiazide: 6-15 hours (mean 10h).
Propranolol: 3-6 hours (single dose), prolonged with chronic dosing (up to 12 hours). Hydrochlorothiazide: 6-15 hours; prolonged in renal impairment.
Hydralazine: 80% renal (mainly as metabolites, 1-2% unchanged), 10% fecal. Hydrochlorothiazide: >95% renal (unchanged) via organic anion transporters.
Renal: 40% unchanged propranolol; 60% as metabolites. Biliary/fecal: minimal (less than 1%). Hydrochlorothiazide: renal 95% unchanged.
Category A/B
Category C
Thiazide Diuretic
Beta Blocker and Thiazide Diuretic