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digitalis (dij″ĭ-talŽis) dried leaf of Digitalis purpurea; a cardiac glycoside. All drugs prepared from this digitalis leaf are members of the same group and principles of administration are the same, although they vary according to speed of action and potency. Digitalis in its many forms is one of the most frequently prescribed drugs in the United States. It can be very effective in treatment of cardiac conditions, but its therapeutic range is narrow; a therapeutic dose is only about one third less than the dose that will induce toxicity.
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