Comparative Pharmacology
Head-to-head clinical analysis: ALDORIL 25 versus HYDRA ZIDE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: ALDORIL 25 versus HYDRA ZIDE.
ALDORIL 25 vs HYDRA-ZIDE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Combination of methyldopa, a centrally acting alpha-2 adrenergic agonist that reduces sympathetic outflow, and hydrochlorothiazide, a thiazide diuretic that inhibits sodium reabsorption in the distal convoluted tubule, reducing plasma volume.
Hydra-Zide is a combination of hydrochlorothiazide (thiazide diuretic) and hydralazine (direct vasodilator). Hydrochlorothiazide inhibits the sodium-chloride symporter in the distal convoluted tubule, reducing electrolyte reabsorption and increasing urine output. Hydralazine relaxes arteriolar smooth muscle, decreasing systemic vascular resistance and afterload.
Oral: 1 tablet (hydrochlorothiazide 25 mg/methyldopa 250 mg) twice daily; increase as needed to max 2 tablets twice daily.
Oral, 1 tablet (25 mg hydrochlorothiazide / 50 mg hydralazine) twice daily, titrated up to maximum of 2 tablets twice daily based on blood pressure response.
None Documented
None Documented
7-16 hours (terminal). In renal impairment, half-life may exceed 24 hours, requiring dose adjustment.
Hydralazine: 2-4 hours (fast acetylators), 4-8 hours (slow acetylators); thiazide: 6-15 hours.
Renal: ~85% unchanged. Biliary/fecal: ~15% as metabolites.
Renal: 50-70% of hydralazine as metabolites, 30-40% as parent drug; thiazide: 95% renal as unchanged drug.
Category C
Category C
Antihypertensive Combination
Antihypertensive Combination