The asymmetric membrane capsule is an example of a single core
osmotic delivery system, consisting of a drug-containing core surrounded by an asymmetric
membrane made with a non disintegrating
polymer (
cellulose acetate,
ethylcellulose etc.).[1][2]
References
^Wang, Chun-Yu; Ho, Hsiu-O; Lin, Ling-Hong; Lin, Ying-Ku; Sheu, Ming-Thau (2005). "Asymmetric membrane capsules for delivery of poorly water-soluble drugs by osmotic effects". International Journal of Pharmaceutics. 297 (1–2): 89–97.
doi:
10.1016/j.ijpharm.2005.03.026.
PMID15885936.
^Philip, Anil K.; Pathak, Kamla; Shakya, Pragati (2008). "Asymmetric membrane in membrane capsules: A means for achieving delayed and osmotic flow of cefadroxil". European Journal of Pharmaceutics and Biopharmaceutics. 69 (2): 658–666.
doi:
10.1016/j.ejpb.2007.12.011.
PMID18206358.