[Study of the release mechanism of theophylline from newly designed sustained release preparations].
D000328:Adult; D002463:Cell Membrane Permeability; D003692:Delayed-Action Preparations; D004058:Diffusion; D005260:Female; D006801:Humans; D007408:Intestinal Absorption; D008297:Male; D013607:Tablets; D013806:Theophylline / Q000378:metabolism
D003692:Delayed-Action Preparations; D013607:Tablets; D013806:Theophylline