Oral sustained-release preparation

摘要

PCT No. PCT/JP95/01905 Sec. 371 Date Dec. 22, 1996 Sec. 102(e) Date Dec. 22, 1996 PCT Filed Sep. 21, 1995 PCT Pub. No. WO96/10397 PCT Pub. Date Apr. 11, 1996A pharmaceutical preparation is provided by a microcapsule containing a physiologically active substance which is water-soluble only at a pH of about 3 or below, and a polymer which is biodegradable upon oral administration. A process for producing the microcapsule is also provided.