This section is from the book "A Text-Book Of Materia Medica And Pharmacy For Medical Students", by Velyien Ewart Henderson. Also available from Amazon: A Text-Book of Materia Medica and Pharmacy for Medical Students.
(Theine). Dose, 1 - 5 grs.; 1/2 - 3dgms. An alkaloid obtained from the leaves of Camellia Thea (the tea plant) and from beans of Coffea Arabica (coffee). Colourless inodorous acicu-lar silky crystals. Soluble, 1 in 80 of cold, readily in boiling water; 1 in 40 of alcohol.
Incompatibles, tannic acid, mercuric salts. (Compatible with other alkaloidal precipitants.)
1Caffeinae Citras. Dose, 2 - 10 grs.; 1 - 6 dgms. A white odourless powder, with an acid faintly bitter taste, and an acid reaction when in solution. Solubility, 1 in 32 of water, with 3 parts of water gives a syrupy solution, 1 in 22 of alcohol.
1Caffeinae Citras Effervescens. Dose, 60 - 120 grs.; 4 - 8 gms. - 4; Sodium Bicarbonate, 51; Citric acid, 18; Tartaric Acid, 27; Sugar, 14.