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Misuse preventative, controlled release formulation

  • US 8,486,449 B2
  • Filed: 12/16/2009
  • Issued: 07/16/2013
  • Est. Priority Date: 12/16/2008
  • Status: Active Grant
First Claim
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1. A solid, compressed controlled release composition for oral administration of at least one pharmaceutically active agent, comprising:

  • (a) a first layer comprising a first population of controlled release microparticles having a pharmaceutically active agent disposed therein;

    (b) a second layer comprising a pharmaceutically active agent disposed therein, wherein the second layer is adjacent the first layer;

    (c) a superabsorbent material selected from the group consisting of an acrylic acid polymer cross-linked with divinyl glycol, an acrylic acid polymer cross-linked with allyl ethers of pentaerythritol, and a mixture thereof disposed within the first layer, the second layer, or both the first layer and the second layer, wherein the superabsorbent material comprises from about 10% to about 50% w/w of the layer containing the superabsorbent material;

    (d) a controlled release agent disposed within the first layer, the second layer, or both the first layer and the second layer; and

    (e) the composition having a hardness from about 200 N to about 400 N, and wherein the composition,(i) when intact and exposed to an aqueous medium, the pharmaceutically active agent disposed in the second layer is initially released at a faster rate than the pharmaceutically active agent disposed in the first layer,(ii) when crushed and exposed to a volume of an aqueous medium that weighs 30 times the weight of the superabsorbent material in the composition, the composition absorbs all of the aqueous medium and swells to create a hard gel that traps the microparticles, whereupon the hard gel, the controlled release agent and microparticles provide controlled release of at least the pharmaceutically active agent disposed within the microparticles, and(iii) when broken and exposed to 900 mL of water in a U.S.P. Type I Apparatus with stirring at 100 rpm for 30 minutes at 37°

    C., less than about 50% by weight of the pharmaceutically active agent originally present in the formulation before it was broken is released into the water.

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