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Claims for Patent: 6,010,718

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Claims for Patent: 6,010,718

Title: Extended release formulations of erythromycin derivatives
Abstract:Disclosed is a pharmaceutical composition for extended release of an erythromycin derivative in the gastrointestinal environment. The composition comprises an erythromycin derivative and a pharmaceutically acceptable polymer so that, when ingested orally, the composition induces statistically significantly lower C.sub.max in the plasma than an immediate release composition of the erythromycin derivative while maintaining bioavailability and minimum concentration substantially equivalent to that of the immediate release composition of the erythromycin derivative upon multiple dosing. The compositions of the invention have an improved taste profile and reduced gastrointestinal side effects as compared to those for the immediate release composition.
Inventor(s): Al-Razzak; Laman (Highland Park, IL), Crampton; Sheri L. (Gurnee, IL), Gustavson; Linda E. (Evanston, IL), Hui; Ho-Wah (Libertyville, IL), Milman; Nelly (Skokie, IL), Semla; Susan J. (Evanston, IL)
Assignee: Abbott Laboratories (Abbott Park, IL)
Application Number:08/838,900
Patent Claims: 1. A pharmaceutical composition for extended release of an erythromycin derivative in the gastrointestinal environment, comprising an erythromycin derivative and from about 5 to about 50% by weight of a pharmaceutically acceptable polymer, so that when ingested orally, the composition induces statistically significantly lower mean fluctuation index in the plasma than an immediate release composition of the erythromycin derivative while maintaining bioavailability substantially equivalent to that of the immediate release composition of the erythromycin derivative.

2. The pharmaceutical composition of claim 1, wherein the polymer is a hydrophilic water-soluble polymer.

3. The pharmaceutical composition of claim 2, wherein the polymer is selected from the group consisting of polyvinylpyrrolidine, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, methyl cellulose, vinyl acetate/crotonic acid copolymers, methacrylic acid copolymers, maleic anhydride/methyl vinyl ether copolymers and derivatives and mixtures thereof.

4. A pharmaceutical composition for extended release of an erythromycin derivative in the gastrointestinal environment, comprising an erythromycin derivative and from about 5 to about 50% by weight of a pharmaceutically acceptable polymer, so that upon oral ingestion, maximum peak concentrations of the erythromycin derivative are lower than those produced by an immediate release pharmaceutical composition, and area under the concentration-time curve and the minimum plasma concentration are substantially equivalent to that of the immediate release pharmaceutical composition.

5. A method of using an extended release, pharmaceutical composition comprising an erythromycin derivative and from about 5 to about 50% by weight of a pharmaceutically acceptable polymer, comprising administering the composition in an effective amount for the treatment of bacterial infection in a mammal, whereby an area under the concentration-time curve substantially equivalent to that for an immediate release pharmaceutical composition of the erythromycin derivative is maintained.

6. An extended release pharmaceutical composition comprising an erythromycin derivative and a pharmaceutically acceptable polymer, the composition having an improved taste profile as compared to the immediate release formulation.

7. The extended release pharmaceutical composition according to claim 3, wherein the polymer is hydroxypropylmethyl cellulose.

8. The extended release pharmaceutical composition according to claim 7, wherein the hydroxypropylmethyl cellulose is a low viscosity cellulose with viscosity ranging from about 50 to about 200 cps.

9. The extended release pharmaceutical composition according to claim 8, wherein the viscosity of the polymer is about 100 cps.

10. The extended release pharmaceutical composition according to claim 2, wherein the composition comprises from about 5 to about 45% by weight of the polymer.

11. The extended release pharmaceutical composition according to claim 2, wherein the composition comprises from about 45 to about 60% by weight of the erythromycin derivative.

12. The extended release pharmaceutical composition according to claim 11, wherein the composition comprises about 50% by weight of the erythromycin derivative.

13. The extended release pharmaceutical composition according to claim 10, wherein the composition comprises from about 10 to about 30% by weight of the polymer.

14. The extended release pharmaceutical composition according to claim 13, wherein the composition comprises from about 10 to about 30% by weight of hydroxypropylmethyl cellulose having a viscosity of about 100 cps.

15. The extended release pharmaceutical composition according to claim 14, wherein the erythromycin derivative is clarithromycin.

16. The extended release pharmaceutical composition according to claim 15, wherein the composition comprises about 50% by weight of clarithromycin.
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