This section is from the book "A Text-Book Of Materia Medica, Pharmacology And Therapeutics", by George F. Butler. Also available from Amazon: A text-book of materia medica, pharmacology and therapeutics.
Definition. - The wood of Picrasma excelsa (Swz.) Plancon, known commercially as Jamaica quassia or of Quassia amara L., known commercially as Surinam quassia.
Description and Properties. - In the shops it is usually met with in the form of chips or raspings of a yellowish-white color, or in billets (Surinam). Quassia contains two bitter principles - quassin and picrasmin. It contains no tannin.
Dose. - 10-30 grains (0.6-2.0 Gm.) [7 1/2 grains (0.55 Gm.), U. S. P.].
Extractum Quassiae - Extracti Quassiae - Extract of Quassia. - Dose, 1-3 grains (0.065-0.2 Gm.).
Fluidextractum Quassiae - Fluidextracti Quassiae - Fluidextract of Quassia. - Dose, 10-30 minims (0.6-2.0 Cc.) [average dose, 8 minims (0.5 Cc), U. S. P.].