IE32343L - Powder composition - Google Patents

Abstract

1,242,211. Powder compositions for inhalation. FISONS PHARMACEUTICALS Ltd. 23 July, 1968 [8 Aug., 1967], No. 36270/67. Heading A5B. A pharmaceutical powder composition for inhalation comprises a mixture of a solid finely divided medicament having an effective particle size in the range 0.01 to 10 microns and a solid pharmaceutically acceptable water-soluble carrier having an effective particle size in the range 30-80 microns. The composition is preferably substantially free of particles having effective particle sizes in the range 11-29 microns. The medicament may be diluted with a solid pharmaceutically acceptable watersoluble diluent of the same effective particle size. The diluent or carrier may be dextran, mannitol or lactose preferably crystalline lactose. The medicament may be an antianaphylactic agent such as sodium chromoglycate, a sympathomimetic amine such as isoprenaline or ephedrine, an antibiotic such as penicillin or tetracycline, a steroid, enzyme, vitamin, antihistamine or mucolytic such as N- acetyl cysteine. A preferred composition contains sodium chromoglycate and isoprenaline sulphate. The surface characteristics of the medicament or carrier particles may have been modified by crystallisations, spray drying, precipitation or by coating with a pharmaceutically acceptable material, e.g. stearic acid or polyvinyl pyrrolidone (which coating may give the medicament sustained release action). The powder may be contained in a capsule, e.g. of gelatin or plastic, which is pierced for administration. The powder may be administered as a dispersion in an air stream obtained by simultaneous rotation and vibration of the pierced capsule. The composiitons are prepared by mixing together, preferably in a stirred mixer, the medicament and carrier, which if necessary have been subjected to comminution and particle size classification prior to mixing. [GB1242211A]