Lamellae.—Discs.
Other tomes: BPC
SYNONYMS: Gelatin discs, Medicated gelatin.
Preparation and History.—Under this head the British Pharmacopoeia (1885), without giving processes for making them, introduces discs of gelatin, medicated with powerful alkaloids, for insertion under the eyelids for ocular effects. They weigh about 1/50 grain and are about 1/25 of an inch thick. They are prepared by pouring upon glass or porcelain, slightly greased to prevent their adhering, hot solutions of the desired alkaloids in gelatin, allowing them to cool, and finally cutting them into the form of discs. To keep them pliable glycerin is added. The following are official in the British Pharmacopoeia, 1885:
LAMELLAE ATROPINAE, Discs of atropine.—"Discs of gelatine, with some glycerine, each weighing about 1/50 grain, and containing 1/5000 grain of sulphate of atropine"—(Br. Pharm., 1885).
LAMELLAE COCAINAE, Discs of cocaine.—"Discs of gelatine, with some glycerine, each weighing about 1/50 grain, and containing 1/200 grain of hydrochlorate of cocaine"—(Br. Pharm., 1885).
LAMELLAE PHYSOSTIGMINAE, Discs of physostigmine.—"Discs of gelatine, with some glycerine, each weighing about 1/50 grain, and containing 1/1000 grain of physostigmine"—(Br. Pharm., 1885).
The British Pharmacopoeia, of 1898, has added the following.
LAMELLAE HOMATROPINAE, Discs of homatropine.—"Discs of gelatine, with some glycerine, each weighing about 1/50 grain (1.3 milligrammes), and containing 1/100 grain (0.65 milligramme) of homatropine hydrobromide"—(Br. Pharm., 1898).
