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Composition and dosage form comprising opioid antagonist

  • US 5,866,164 A
  • Filed: 03/12/1997
  • Issued: 02/02/1999
  • Est. Priority Date: 03/12/1996
  • Status: Expired due to Term
First Claim
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1. An osmotic dosage form comprising:

  • (a) a wall comprising a semipermeable composition, which wall surrounds;

    (b) a bilayer core comprising;

    (i) a first layer comprising 75 ng to 750 mg of an analgesic opioid;

    (ii) a second push-displacement layer in bilayered contact with the first layer comprising 40 to 99 wt % of a poly(alkylene oxide) possessing a number-average molecular weight to 10,000,000, and 0.25 to 25 wt % of a hydroxyalkylcellulose possessing a number-average molecular weight to 75,000, and wherein the second layer is characterized by comprising 0.75 to 10 wt % of an antagonist selected from the group consisting of naltrexone, naloxone, nalmefene, nalide, nalmexone, nalorphine and nalbuphine; and

    ,(c) an exit in the wall in contact with the first layer comprising the analgesic opioid for the push-displacement layer to push the first layer comprising the analgesic opioid through the exit from the dosage form.

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