Oxide of Zinc. Flowers of Zinc. ZnO.

Comp. 1 Eq. Zinc 32.5, + 1 Oxygen = 8 = 40.5, Eq. Wt.; or Zinc 85.25, Oxygen 19.75, in 100 parts.

* Surgeon's Vade Mecum, p. 386. Lancet, Dec. 1850. Op. cit.

§ Cyc. Pract. Med., vol. iv. p. 620. || Bull. Gen. de Therap., Nov. 1856.

Med. Prop. and Action. Tonic and anti-spasmodic. In large doses it causes vomiting, and sometimes purging; by gradually increasing the dose, how-ever, very large quantities may be taken without producing any sensible effect. Externally applied, it is an astringent. It may be used in the form of ointment, in solution (oz. ss. to Water Oij.), or in fine powder.

Offic. Prep. Unguentum Zinci Oxidi (Oxide of Zinc in fine powder grs. lxxx. Simple Ointment oz. j. Prepared by adding the Oxide of Zinc to the melted ointment, and stirring until it solidifies).

Dose, gr. ij. - gr. v. or gr. x., in pill or powder.

Incompatibles. Acids; Acidulous Salts; and Alkalies.

2841. Therapeutic Uses

In Spasmodic Asthma, it was first employed by Dr. Withers, in 1787. He speaks highly of its efficacy, and relates several cases successfully treated by it. The I dose recommended by him is from gr. v. to xx., twice or thrice daily. It is only admissible in purely spasmodic asthma; and though occasionally useful if persevered in during the intervals, it is inferior to many other metallic tonics.