Patent Document ID: 20050118268
Application ID: 10675656
Patent Flag: 0

Claim One:
1. A pharmaceutical dosage form which comprises a plurality of core particles, each core particle containing a drug; said particle being coated with: a) a first membrane of an enteric polymer; b) a second membrane of a combination of a water-insoluble polymer and an enteric polymer; and c) an intermediate membrane comprising an organic acid between the first and second membranes, wherein said water-insoluble and said enteric polymers are present in said second membrane at a weight ratio of about 10:1 to 1:1, the total weight of the first and second coatings is about 15 to 80 wt. % based on the total weight of the coated particles; and wherein the first and second membranes can be coated on the core particle in either order.