Comparative Pharmacology
Head-to-head clinical analysis: BETIMOL versus METOPROLOL TARTRATE AND HYDROCHLOROTHIAZIDE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: BETIMOL versus METOPROLOL TARTRATE AND HYDROCHLOROTHIAZIDE.
BETIMOL vs METOPROLOL TARTRATE AND HYDROCHLOROTHIAZIDE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Nonselective beta-adrenergic receptor antagonist; reduces intraocular pressure by decreasing aqueous humor production.
Metoprolol is a cardioselective beta-1 adrenergic receptor antagonist that reduces heart rate, myocardial contractility, and blood pressure. Hydrochlorothiazide is a thiazide diuretic that inhibits the sodium-chloride symporter in the distal convoluted tubule, increasing excretion of sodium and water, thereby reducing plasma volume and blood pressure.
1 drop of 0.25% or 0.5% solution in the affected eye(s) twice daily. If inadequate response, increase to 0.5% solution twice daily.
Oral: 50-100 mg metoprolol tartrate/12.5-25 mg hydrochlorothiazide once or twice daily; maximum 200 mg metoprolol/50 mg hydrochlorothiazide per day.
None Documented
None Documented
2.5 to 5 hours (average 4 hours) in patients with normal renal function; may be prolonged in renal impairment (up to 8-10 hours).
Metoprolol: 3–7 h (terminal), clinical context: may require twice-daily dosing; prolonged in hepatic impairment. Hydrochlorothiazide: 6–15 h (terminal), clinical context: supports once-daily dosing; prolonged in renal impairment.
Primarily renal (unchanged drug and metabolites). Approximately 60-80% of a dose is excreted renally as unchanged timolol, with the remainder as inactive metabolites. Biliary/fecal excretion accounts for less than 20%.
Metoprolol: <5% renal (unchanged), >95% hepatic metabolism, metabolites excreted renally. Hydrochlorothiazide: >95% renal (unchanged).
Category C
Category C
Beta-Blocker
Beta-Blocker