SPL Set ID: 2bcd56ee-4497-4b8d-84db-a1470c77827b

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 2 portions: a sugar and a cardenolide (hence “glycosides”). Digoxin is described chemically as (3β,5β,12β)-3-[( O -2,6-dideoxy-β- D-ribo -hexopyranosyl-­(1→4)- O -2,6-dideoxy-β- D-ribo- hexopyranosyl-(1→4)-2,6-dideoxy-β- 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 780.95, and its structural formula is: Digoxin USP exists as clear to white, crystals or white crystalline powder that melt with decomposition above 230°C. The drug is practically insoluble in water, soluble in a mixture of equal volumes of methanol and methylene chloride, slightly soluble in ethanol (96 per cent). Digoxin tablets, USP are supplied as 62.5 mcg (unscored), 125 mcg (scored) and 250 mcg (scored) tablets for oral administration. Each tablet contains the labeled amount of digoxin USP and the following inactive ingredients: corn starch, lactose monohydrate, magnesium stearate and pregelatinized starch (maize). In addition the 62.5 mcg tablets contain FD & C Yellow No. 6 Lake. FDA approved dissolution test specifications differ from USP. Chemical Structure