Comparative Pharmacology
Head-to-head clinical analysis: APRESAZIDE versus EXFORGE HCT.
Peer-Reviewed Evidence
Head-to-head clinical analysis: APRESAZIDE versus EXFORGE HCT.
APRESAZIDE vs EXFORGE HCT
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Apresazide is a combination of hydralazine, a direct-acting vasodilator that relaxes arteriolar smooth muscle, and hydrochlorothiazide, a thiazide diuretic that inhibits sodium and chloride reabsorption in the distal convoluted tubule.
EXFORGE HCT is a combination of amlodipine (a dihydropyridine calcium channel blocker), valsartan (an angiotensin II receptor blocker), and hydrochlorothiazide (a thiazide diuretic). Amlodipine inhibits calcium ion influx across cardiac and vascular smooth muscle cells, leading to vasodilation. Valsartan blocks the vasoconstrictor and aldosterone-secreting effects of angiotensin II. Hydrochlorothiazide increases excretion of sodium and water by inhibiting the Na+/Cl- symporter in the distal convoluted tubule.
1 capsule (hydralazine 25 mg / hydrochlorothiazide 25 mg) orally twice daily; may increase to 2 capsules twice daily if needed. Maximum: 4 capsules daily.
One tablet orally once daily. Initial dose based on previous antihypertensive therapy; maximum dose is one tablet of 10 mg amlodipine/320 mg valsartan/25 mg hydrochlorothiazide per day.
None Documented
None Documented
Hydralazine: 2-4 hours (fast acetylators), 4-8 hours (slow acetylators); Hydrochlorothiazide: 6-15 hours. Clinical context: Dosing interval typically 12 hours for hydralazine component.
Valsartan: 6 hours (terminal). Amlodipine: 30-50 hours (terminal), permits once-daily dosing. Hydrochlorothiazide: 6-15 hours (terminal).
Hydralazine: ~75% renal (metabolites), <10% unchanged; Hydrochlorothiazide: >95% renal (unchanged).
Valsartan: 13% excreted unchanged in urine, 83% in feces via biliary secretion. Amlodipine: 10% excreted unchanged in urine, 60% as metabolites in urine, 20-25% in feces. Hydrochlorothiazide: ≥95% excreted unchanged in urine.
Category C
Category C
Antihypertensive
Antihypertensive