Patent ID: 8703193

Claim:
A controlled porous osmotic pump tablet without being drilled by using laser comprising: (a) a core comprising a principal agent, a permeation enhancer and a permeation aid; (b) a semipermeable membrane disposed over the core, the semipermeable membrane comprising pores and comprising a film-forming material and a pore-forming agent forming the pores of the semipermeable membrane; wherein the semipermeable membrane comprises 20-45% by weight of the pore-forming agent, said pore-forming agent is selected from the group consisting of polyethylene glycol 2000-6000, hydroxypropyl cellulose, or both, and the film-forming material is selected from the group consisting of cellulose acetate, ethyl cellulose, hydroxypropylmethyl cellulose, polyacrylic resin, and mixtures thereof; and wherein the semipermeable membrane is present in an amount of 10-35% by weight of the core.