Comparative Pharmacology
Head-to-head clinical analysis: HYDRALAZINE AND HYDROCHLOROTHIAZIDE versus INDERIDE 40 25.
Peer-Reviewed Evidence
Head-to-head clinical analysis: HYDRALAZINE AND HYDROCHLOROTHIAZIDE versus INDERIDE 40 25.
HYDRALAZINE AND HYDROCHLOROTHIAZIDE vs INDERIDE-40/25
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
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.
Inderide-40/25 is a combination of propranolol (non-cardioselective beta-blocker) and hydrochlorothiazide (thiazide diuretic). Propranolol reduces heart rate, myocardial contractility, and renin secretion via beta-adrenergic receptor blockade. Hydrochlorothiazide inhibits Na+/Cl- cotransporter in distal convoluted tubule, increasing excretion of Na+, Cl-, and water; also reduces peripheral vascular resistance.
Oral: 1 tablet (hydralazine 25 mg / hydrochlorothiazide 25 mg) 1-2 times daily. Maximum: hydralazine 200 mg/day, hydrochlorothiazide 50 mg/day.
One tablet (40 mg propranolol HCl/25 mg hydrochlorothiazide) orally twice daily; may increase to maximum of 160 mg propranolol/100 mg hydrochlorothiazide per day in divided doses.
None Documented
None Documented
Hydralazine: 2-4 hours (fast acetylators), 4-8 hours (slow acetylators); extended in renal impairment. Hydrochlorothiazide: 6-15 hours; prolonged in renal impairment.
Propranolol: 3-6 hours (terminal); clinical context: dosing 2-3 times daily due to short half-life; may accumulate in hepatic impairment. Hydrochlorothiazide: 6-15 hours (terminal); clinical context: longer in renal impairment.
Hydralazine: 80-90% renal (mostly as metabolites), <10% unchanged. Hydrochlorothiazide: 95-99% renal (unchanged).
Propranolol: extensively metabolized in liver via CYP2D6 and glucuronidation; <1% excreted unchanged in urine. Hydrochlorothiazide: ~70% excreted unchanged in urine via tubular secretion.
Category A/B
Category C
Thiazide Diuretic
Beta Blocker and Thiazide Diuretic