This section is from the book "Materia Medica Pharmacy, Pharmacology And Therapeutics", by W. Hale White. Also available from Amazon: Materia Medica Pharmacy, Pharmacology And Therapeutics..
Tonga. - The bark of Raphidorphora vitiensis (nat. ord. Araceae) and Premna taitensis (nat. ord. Verbenaceae).
Dose, 1/4 to 1 dr.; 1. to 4. gm.
Tonga as a fluid extract; dose, 1/4 to 1 fl. dr.; 1. to 4. c.c., undoubtedly relieves some cases of intractable neuralgia. Combined with salicylates it is of great value for the treatment of so-called muscular rheumatism. In large doses it is purgative.