Abuse resistant drugs, method of use and method of making

1. An oral, immediate release pharmaceutical composition comprising a tablet unit dosage form comprising the following tablet layers:

an innermost expansion layer comprising an expandable polymer which comprises a hydrophilic polymer that swells upon contact with liquids and/or forms a gel;

a barrier layer substantially covering the expansion layer, wherein the barrier layer comprises a first polymer selected from the group consisting of: acrylic or methacrylic polymers or copolymers thereof; and

a diffusion layer comprising a drug and a second polymer selected from the group consisting of acrylic or methacrylic polymers or copolymers thereof, and wherein said first and second polymer each comprise the same polymer or copolymer,

wherein the diffusion layer substantially covers the barrier layer,

wherein the diffusion layer is bonded to the barrier layer by curing the layers together,

wherein the drug comprises morphine or a pharmaceutically acceptable salt thereof and oxycodone or a pharmaceutically acceptable salt thereof, wherein the pharmaceutical composition does not comprise a drug that is not an opioid agonist or a central nervous stimulant, and wherein the diffusion layer is the only drug-containing layer,

wherein the drug is substantially homogeneously distributed within the second polymer and diffuses from the diffusion layer within the gastrointestinal (GI) tract,

wherein when the pharmaceutical composition is physically compromised and particles of the pharmaceutical composition containing the diffusion layer and the barrier layer are formed, the bond between the diffusion layer and the barrier within the particles is substantially preserved,

wherein when the pharmaceutical composition is physically compromised to produce particles having a particle size between 8 and 500 mesh, a relative surface area of the diffusion layer increases no more than 50%, and

wherein when the pharmaceutical composition is orally or intranasally administered in physically compromised form to a subject, an intensity of euphoria is lower than the intensity of euphoria achieved after administration of a physically compromised bioequivalent composition not configured to deter abuse.

2. The pharmaceutical composition of claim 1 , wherein the expansion layer comprises a polymer present in the range of 5 to 90% by weight of the dosage form.

3. The pharmaceutical composition of claim 1 , wherein when the pharmaceutical composition is physically compromised and particles of the pharmaceutical composition containing the expansion layer are formed and exposed to a liquid, the expandable polymer of the expandable layer absorbs at least a portion of the liquid.

4. The pharmaceutical composition of claim 1 , wherein when the pharmaceutical composition is administered in an intact form, the first polymer of the barrier layer is substantially undissolved in the GI tract.

5. The pharmaceutical composition of claim 1 , wherein when the pharmaceutical composition is administered in physically compromised form to a subject, the Cmax and/or AUC achieved after 2 hours after administration is substantially the same or lower than the Cmax and/or AUC achieved when the pharmaceutical composition is administered in an intact form.

6. The pharmaceutical composition of claim 5 , wherein the Cmax and/or AUC achieved after 2 hours after administration is 20-75% lower than the Cmax and/or AUC achieved when the pharmaceutical composition is administered to a subject in an intact form.

7. The pharmaceutical composition of claim 1 , wherein the composition comprises morphine or a pharmaceutically acceptable salt thereof in an amount of about 15 mg to about 800 mg and oxycodone or a pharmaceutically acceptable salt thereof in an amount of about 5 mg to about 400 mg.

8. The pharmaceutical composition of claim 1 , wherein the first polymer and the second polymer each comprise a copolymer of ethyl acrylate and methyl methacrylate.

9. The pharmaceutical composition of claim 1 , wherein the expandable polymer of the innermost expansion layer forms a gel after exposure to a liquid after the tablet is physically compromised to retard release of the drug from the diffusion layer, and increases viscosity of the liquid making it difficult for an abuser to draw up said liquid into a syringe.

10. The pharmaceutical composition of claim 1 , wherein said innermost expansion layer comprises said expandable polymer in the range of 5 to 90% by weight, based on a total weight of the tablet unit dosage form.

11. The pharmaceutical composition of claim 1 , wherein said expandable polymer comprises microcrystalline cellulose.

12. The pharmaceutical composition of claim 11 , wherein said expandable polymer further comprises hydroxypropyl methylcellulose.