To natural Oleoresins, derived as plant-exudations, belong the Turpentines and the Pitches. From similar exudations are obtained the Gum Resins, mixtures of Gum and Resins and sometimes Volatile Oils; also the Balsams, which are Resins or Oleoresins associated with Benzoic or Cinnamic Acid. These are treated under their respective Drugs.

The pharmaceutical Oleoresins are semi-liquid extracts, obtained by exhausting oleoresinous drugs with acetone (alcohol is employed in the manufacture of Oleoresin of Cubeb).

This extracts fixed and volatile oils and resin; these principles constitute therefore the oleoresins, which sometimes also contain other active matter in solution or suspension.

The six following are official:

Oleoresina -

Gm.

Gr.

Aspidii; separates in two layers, to be mixed when used..............

2.

30

Capsici; separates fat, used only as corrective

0.03

1/2

Cubebae; separates wax.........

0.5

7 1/2

Lupulini.....................................

0.2

3

Piperis; separates piperine, to be rejected ...........................

0.03

1/2

Zingiberis................

0.03

1/2