ABUSE-RESISTANT OPIOID DOSAGE FORM

1 . A pharmaceutical dosage form comprising an opioid antagonist surrounded by a controlled release matrix and an opioid agonist in a surrounding matrix.

2 . The pharmaceutical dosage form of claim 1 , wherein the opioid antagonist is selected from the group consisting of naloxone, naltrexone, nalorphine, diprenorphine, levallorphan, pentazocine, metazocine, cyclazocine, etazocine, N-cyclopropylmethyl-7,8-dihydro-14-hydroxynormophinone, 21-cyclopropyl-z,-(1-hydroxy-1-methylethyl)-6,14-endo-ethano-tetrahydrooripavine, 21-cyclopropyl-z,-(1-hydroxy-1-methylethyl)-6,14-endo-ethano-tetrahydrodiphenorphine and pharmaceutically acceptable addition salts thereof;

and the opioid agonist is selected from the group consisting of codeine, dihydrocodeine, hydrocodone, hydromorphone, levorphanol, meperidine, buprenorphine, fentanyl, fentanyl derivatives, dipipanone, heroin, tramadol, etorphine, dihydroetorphine, butorphanol, methadone, morphine, oxycodone, oxymorphone, propoxyphene and pharmaceutically acceptable salts thereof.

3 . The pharmaceutical dosage form of claim 2 , wherein the opioid antagonist surrounded by a controlled release matrix is in the form of a granule.

4 . The pharmaceutical dosage form of claim 3 , wherein the opioid antagonist surrounded by a controlled release matrix is located in the center of the pharmaceutical dosage form.

5 . The pharmaceutical dosage form of claim 4 , wherein the surrounding matrix releases the opioid agonist in a patient body and the dosage form is eliminated from the patient body prior to release of the opioid antagonist surrounded by a controlled release matrix when the pharmaceutical dosage form is administered intact to the patient body.

6 . The pharmaceutical dosage form of claim 5 , wherein the surrounding matrix comprises at least one selected from the group consisting of a cellulose, a quaternary ammonium acrylic polymer, a quaternary ammonium methacrylic polymer, an acrylic ester copolymer and a methacrylic ester copolymer.

7 . The pharmaceutical dosage form of claim 6 which is a tablet.

8 . The pharmaceutical dosage form of claim 4 , wherein the surrounding matrix releases the opioid agonist in a patient body and the dosage form releases a therapeutically ineffective amount of the opioid antagonist surrounded by a controlled release matrix in the patient body when the pharmaceutical dosage form is administered intact to the patient body.

9 . The pharmaceutical dosage form of claim 8 , wherein the surrounding matrix comprises at least one selected from the group consisting of a cellulose, a quaternary ammonium acrylic polymer, a quaternary ammonium methacrylic polymer, an acrylic ester copolymer and a methacrylic ester copolymer.

10 . The pharmaceutical dosage form of claim 9 which is a tablet.