Digitek

[digoxin]

Drug Description
DESCRIPTION

DIGITEK (digoxin) is one of the cardiac (or digitalis) glycosides, a closely related group of drugs having in common specific effects on the myocardium.

These drugs are found in a number of plants. Digoxin is extracted from the leaves of Digitalis lanata. The term "digitalis" is used to designate the whole group of glycosides. The glycosides are composed of two portions: a sugar and a cardeno-lide (hence "glycosides").

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Digoxin is described chemically as (3 ß, 5 ß, 12 ß)-3-[( O-2, 6- dideoxy-ß-D-ribo-hexopyranosyl-( 1 4)-O-2,6-dideoxy-ß-D-ribo-hex-opyranosyl-( 1 4)-2,6-dideoxy-ß-D-ribo-hexopyranosyl) oxy]-12,14- dihydroxy-card-20( 22)-enolide. Its molecular formula is C 41 H 64 O 14, its molecular weight is 780.94.

Digoxin exists as odorless white crystals that melt with decomposition above 230° C. The drug is practically insoluble in water and in ether; slightly soluble in diluted (50%) alcohol and in chloroform; and freely soluble in pyridine.

DIGITEK is supplied as 125-mcg (0.125-mg) or 250-mcg (0.25-mg) tablets for oral administration. Each tablet contains the labeled amount of digoxin USP and the following inactive ingredients: corn starch, croscarmellose sodium, microcrystalline cellulose, pregela-tinized starch, lactose monohydrate and anhydrous lactose, silicon dioxide and stearic acid. In addition, the 125-mcg (0.125-mg) tablet contains D& C Yellow No. 10 Aluminum Lake.