Kerledex (betaxolol hydrochloride and chlorthalidone) is a combination product indicated for the treatment of hypertension. It combines the activities of betaxolol hydrochloride, a ?1-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 Structural Formula Illustration

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.

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