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.
Blackberry (bark of the rhizome), Rubus villosus and other species. The fruit of the European Blackberry, R. fruticosus, is official in Italy and Mexico, that of the Red Raspberry, R. Idaeus, in three countries, and the R. villosus was official in the U. S. P. VIII.
Raspberry fruit is used to make a syrup for flavoring purposes. Blackberry bark is tonic and astringent and used in the treatment of diarrhea. Fl. 15 minims, syrup 1 fluidrachm.