Caffeina Citrata Effervescens (U. S. P.)—Effervescent Citrated Caffeine.
Preparation.—"Caffeine, ten grammes (10 Gm.) [154 grs.]; citric acid, ten grammes (10 Gm.) [154 grs.]; sodium bicarbonate, three hundred and thirty grammes (330 Gm.) [11 ozs. av., 280 grs.]; tartaric acid, three hundred grammes (300 Gm.) [10 ozs. av., 255 grs.]; sugar, in very fine powder, three hundred and fifty grammes (350 Gm.) [12 ozs. av., 151 grs.]; alcohol, a sufficient quantity to make one thousand grammes (1000 Gm.) [2 lbs. av., 3 ozs., 120 grs.]. Triturate the solid ingredients, separately well dried, to a fine uniform powder. Mix this with alcohol, to a soft paste, and rub it through a No. 6 tinned iron sieve or enamelled colander. Then dry it, and reduce it to a coarse, granular powder. Keep the product in well-stoppered bottles"—(U. S. P.).
Action, Medical Uses, and Dosage.—An agreeable form in which to administer citrated caffeine, the dose being a teaspoonful dissolved in water, and drunk while effervescing (see Caffeina).