ORAL DRUG DELIVERY SYSTEM

摘要

An oral drug delivery system comprising a coated tablet having one or more surfaces. The coated tablet further comprises a core and a coating surrounding the core. The core comprises an active ingredient composition comprising at least one active ingredient and a pharmaceutically acceptable excipient and a swellable composition located in an immediate vicinity of one or more preselected surfaces. The coating comprises a defect wherein said defect is not a passageway through the preselected portion of the coating and operable to be reliably removed fully from the one or more of the preselected surfaces of the tablet upon contact with an aqueous environment, but not removed from at least one of the surfaces.