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To the Editor:—
In the article by Stroud and Vander Veer on digitalis (The Journal, Nov. 27, 1937, page 1809, second column, first paragraph) it is stated that the dry digitalis preparations are to be preferred to the tincture for the reason, among others, that the dose is much more accurate "since even with the standard minim dropper the patient is apt to miscount the number of drops." The inference could be easily drawn from this that correct counting with the standard minim dropper would give correct dosage. Presumably the dropper referred to was the one made official in this country on June 1, 1936, which delivers 80 drops of water in 4 cc. but requires from 160 to 180 drops of tincture of digitalis to produce a bulk measure of 4 cc.A footnote states that "a dose in drops from an ordinary dropper has from two to three
Luton S. DOSAGE OF DIGITALIS. JAMA. 1938;110(10):758. doi:10.1001/jama.1938.02790100056025