Pseudoephedrine hydrochloride osmotic pump controlled release tablet

The invention provides a one-cell pseudoephedrine hydrochloride osmotic pump controlled release tablet. A semipermeable membrane containing ethyl cellulose (EC) and povidone (PVP) is coated on the surface of a tablet core, thus the aging of the semipermeable membrane can be overcome and the medicine residue is lowered. The invention also provides a method for improving the aging resistance of the one-cell pseudoephedrine hydrochloride osmotic pump type controlled release tablet. The method is characterized in that EC and PVP are used as materials of the semipermeable membrane. In addition, the invention also provides an application of an EC-PVP composition in preparing the one-cell pseudoephedrine hydrochloride osmotic pump type controlled release tablet with the aging resistance.