Definition. - An aldehyde, C6H5CH:CH.COH, obtained from oil of cinnamon or prepared synthetically. It is the chief and essential constituent of oil of cinnamon, and should be present to the extent of about 75 per cent. by volume in a good oil.

Description and Properties. - A colorless liquid, having a cinnamon-like odor and a burning, aromatic taste. It may be used for nearly all purposes in place of the official oil of cinnamon. Pure synthetic cinnamic aldehyde occurs in the market, and has to a great extent displaced the natural oil of cinnamon. Sparingly soluble in water, readily in alcohol, fixed and volatile oils.

Dose. - Average dose, 1 minim (0.05 Cc), U. S. P.

Physiological Action. - Cinnamon is an agreeable aromatic stimulant, carminative, stomachic, astringent, hemostatic, and antiseptic. The oil possesses germicidal properties. It has a marked action on the vasomotor system, causing flushing and stimulating peristalsis. In poisonous doses its action approximates that of phenol.

Therapeutics. - The same as for other aromatics. It is much used to impart an agreeable flavor to medicinal compounds and as an adjuvant to other members of this group.