Comparative Pharmacology
Head-to-head clinical analysis: HYDRALAZINE HYDROCHLORIDE AND HYDROCHLOROTHIAZIDE versus NATURETIN 2 5.
Peer-Reviewed Evidence
Head-to-head clinical analysis: HYDRALAZINE HYDROCHLORIDE AND HYDROCHLOROTHIAZIDE versus NATURETIN 2 5.
HYDRALAZINE HYDROCHLORIDE AND HYDROCHLOROTHIAZIDE vs NATURETIN-2.5
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Hydralazine is a direct-acting arteriolar vasodilator that reduces peripheral vascular resistance via relaxation of vascular smooth muscle, possibly by interfering with calcium transport. Hydrochlorothiazide is a thiazide diuretic that inhibits the sodium-chloride symporter in the distal convoluted tubule, increasing excretion of sodium and water, and reducing plasma volume.
Bendroflumethiazide is a thiazide diuretic that inhibits the sodium-chloride symporter (NCC) in the distal convoluted tubule of the kidney, reducing sodium and chloride reabsorption and promoting diuresis.
Initially one capsule (25 mg hydralazine/25 mg hydrochlorothiazide, or 50 mg hydralazine/50 mg hydrochlorothiazide) twice daily, increase as needed to a maximum of 200 mg hydralazine/200 mg hydrochlorothiazide daily.
Hypertension: 2.5 mg orally once daily; may increase to 5 mg daily if needed. Edema: 2.5 to 10 mg orally once daily.
None Documented
None Documented
Hydralazine: 2-8 hours (terminal, prolonged in renal impairment; acetylator phenotype affects clearance; slow acetylators have 2-fold longer half-life). Hydrochlorothiazide: 6-15 hours (terminal, prolonged in renal impairment; clinically relevant for once-daily dosing).
Terminal elimination half-life: 6-9 hours; prolonged in renal impairment and in elderly patients.
Hydralazine: 90% renal (primarily as metabolites, 10-15% unchanged); Hydrochlorothiazide: >95% renal (unchanged). Biliary/fecal: negligible for both.
Renal excretion: approximately 95% as unchanged drug; biliary/fecal: <5%.
Category A/B
Category C
Thiazide Diuretic
Thiazide Diuretic