This section is from the book "Botanic Drugs Their Materia Medica, Pharmacology and Therapeutics", by Thomas S. Blair. Also available from Amazon: Botanic Drugs, Their Materia Medica, Pharmacology and Therapeutics.
Paullinia cupana, in the Austrian and Spanish standards as P. sorbilis. Official in Austria, Hungary, Mexico, Spain, Switzerland, and the U. S. Contains caffeine and theobromine and a fixed oil. Average dose, fl. 30 minims. The caffeine is sometimes called guaramine when derived from guarana; but the action is the same. See "Caffeine." Guarana is employed chiefly in the treatment of nervous sick headache and as a tonic, as is coffee and the other caffeine-bearers.