An oral controlled release pharmaceutical composition comprising a core and a polymer dispersion and its preparation method are disclosed. The core is selected from the group consisting of the drug coated core and the drug loaded core. The drug coated core comprises an inert excipient based sphere and a coat of drug composition. The drug loaded core comprises at least a drug, a binder and at least one pharmaceutically acceptable excipient. The polymer dispersion used to coat the core comprises at least one controlled release polymer and at least one pharmaceutically acceptable excipient. The oral controlled release pharmaceutical composition further comprises an in-situ gelling system comprising at least one gelling polymer.
