Kerledex (betaxolol hydrochloride and chlorthalidone) is a combination product
indicated for the treatment of hypertension. It combines the activities of betaxolol
hydrochloride, a β1-selective (cardioselective) adrenergic receptor
blocking agent, with chlorthalidone, a monosulfamyl diuretic.
Betaxolol hydrochloride is chemically described as 2-propanol, 1-[4-[2-(cyclopropylmethoxy)
ethyl] phenoxy]-3-[(1-methylethyl)amino]-,hydrochloride,(±). It has the
following chemical structure:
Betaxolol hydrochloride is a water-soluble white crystalline powder with a
molecular formula of C18H29NO3 • HCl and
a molecular weight of 343.9. It is freely soluble in water, ethanol, chloroform,
and methanol, and has a pKa of 9.4.
Chlorthalidone, a monosulfamyl diuretic, differs chemically from thiazide diuretics
in that a double-ring system is incorporated in its structure. It is 2-chloro-5-(1-hydroxy-3-oxo-1isoindolinyl)benzenesulfonamide
with a molecular formula of C14H11ClN2O4S
and a molecular weight of 338.76. It is practically insoluble in water, ether
and chloroform; soluble in methanol; and slightly soluble in alcohol.
Kerledex is available as orally administered tablets containing 5 or 10 mg
of betaxolol HCl and 12.5 mg of chlorthalidone (5/12.5; 10/12.5). Inactive ingredients
include corn starch, hydroxypropyl methylcellulose, iron oxide colorant, lactose,
magnesium stearate, polyethylene glycol 400, povidone, and titanium dioxide.
Last reviewed on RxList: 9/6/2011
This monograph has been modified to include the generic and brand name in many instances.