Stabilized sustained release tramadol formulations
First Claim
1. A stabilized sustained release oral solid dosage form containing tramadol as the active agent, comprising an effective amount of tramadol or a pharmaceutically acceptable salt thereof dispersed in a matrix of a hydrophobic material comprising a substance which was melted or softened during the preparation of said matrix, said substance being selected from the group consisting of hydrogenated vegetable oil, hydrogenated castor oil, paraffin, higher aliphatic alcohols, higher aliphatic acids, long chain fatty acids, fatty acid esters, and mixtures thereof, said solid dosage form being subjected to a separate curing step at a temperature from about 35 °
- C. to about 65 °
C. for a sufficient time such that an endpoint is reached at which said solid dosage form provides a stable dissolution profile, said endpoint being determined by comparing the dissolution profile of said solid dosage form immediately after curing to the dissolution profile of said solid dosage form after eposure to accelerated storage conditions of at least one month at 40°
C. and 75% relative humidity.
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0 Petitions
Accused Products
Abstract
A stabilized sustained release oral solid dosage form which includes an effective amount of tramadol or a pharmaceutically acceptable salt thereof dispersed in a matrix of a hydrophobic material comprising a wax-like substance which was melted or softened during the preparation of the matrix, is cured at a temperature from about 35° C. to about 65° C. for a time period from about 4 to about 72 hours, such that the formulation, when subjected to in-vitro dissolution after exposure to accelerated storage conditions of at least one month at 40° C./75% RH, releases an amount of tramadol which does not vary at any given dissolution time point by more than about 20% of the total amount of tramadol released when compared to in-vitro dissolution conducted prior to subjecting the dosage form to the accelerated storage conditions.
228 Citations
38 Claims
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1. A stabilized sustained release oral solid dosage form containing tramadol as the active agent, comprising an effective amount of tramadol or a pharmaceutically acceptable salt thereof dispersed in a matrix of a hydrophobic material comprising a substance which was melted or softened during the preparation of said matrix, said substance being selected from the group consisting of hydrogenated vegetable oil, hydrogenated castor oil, paraffin, higher aliphatic alcohols, higher aliphatic acids, long chain fatty acids, fatty acid esters, and mixtures thereof, said solid dosage form being subjected to a separate curing step at a temperature from about 35 °
- C. to about 65 °
C. for a sufficient time such that an endpoint is reached at which said solid dosage form provides a stable dissolution profile, said endpoint being determined by comparing the dissolution profile of said solid dosage form immediately after curing to the dissolution profile of said solid dosage form after eposure to accelerated storage conditions of at least one month at 40°
C. and 75% relative humidity. - View Dependent Claims (2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 24, 25, 26, 27, 34, 35)
- C. to about 65 °
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7. The stabilized sustained release oral solid dosage form of claim wherein said hydrophilic polymer is a cellulose ether.
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14. A process for prepaing a stabilized sustained release oral solid dosage form containing tramadol as the active agent, comprising:
preparing a matix comprising tramadol or a pharmaceutically acceptable salt thereof dispersed in a matrix of a hydrophobic material comprising a substance which is melted or softened during the preparation of said matrix, said substance being selected from the group consisting of hydrogenated vegetable oil, hydrogenated castor oil, paraffin, higher aliphatic alcohols, higher aliphatic acids, long chain fatty acids, fatty acid esters, and mixtures thereof; and
thereafter curing said matrix at a temperature from about 35°
C. to about 65°
C. for a sufficient time such that an endpoint is reached at which said matrix provides a stable dissolution profile, said endpoint being determined by comparing the dissolution profile of said matrix immediately after curing to the dissolution profile of said matrix after exposure to accelerated storage conditions of at least one month at 40°
C. and 75% relative humidity.- View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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28. A stabilized sustained release tablet containing tramadol as an active ingredient, comprising an effective amount of tramadol or a pharmaceutically acceptable salt thereof dispersed in a matrix of a hydrophobic material comprising a substance which was melted or softened during the preparation of said matrix, said substance being selected from the group consisting of hydrogenated vegetable oil, hydrogenated castor oil, paraffin, higher aliphatic alcohols, higher aliphatic acids, long chain fatty acids, fatty acid esters, and mixtures thereof, said tablet being cured at a temperature from about 35 °
- C. to about 65°
C. for a sufficient time such that an endpoint is reached at which said solid dosage form provides an in-vitro dissolution profile after said dosage form is subjected to accelerated storage conditions of at least one month at 40°
C. and 75% relative humidity in which the total amount of tramadol released does not vary at any given dissolution time point by more than about 20% of the total amount of tramadol released at that dissolution time point prior to subjecting said dosage form to accelerated storage conditions. - View Dependent Claims (29, 30, 31, 32, 33)
- C. to about 65°
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36. A stabilized sustained release oral solid dosage form containing tramadol as the active agent, comprising an effective amount of tramadol or a pharmaceutically acceptable salt thereof dispersed in a matrix of a hydrophobic material comprising a substance which was melted or softened during the preparation of said matrix, said substance being selected from the group consisting of a natural wax, a natural oil, a synthetic wax, a synthetic oil, and mixtures of any of the foregoing, said solid dosage form being subjected to a sepaate curing step at a temperature from about 35°
- C. to about 65°
C. for a sufficient time such that an endpoint is reached at which said solid dosage form provides a stable dissolution profile, said endpoint being determined by comparing the dissolution profile of said solid dosage form immediately after curing to the dissolution profile of said solid dosage form after exposure to accelerated storage conditions of at least one month at 40°
C. and 75% relative humidity.
- C. to about 65°
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37. A process for preparing a stabilized sustained release oral solid dosage form containing tramadol as the active agent, comprising
preparing a matrix comprising tramadol or a pharmaceutically acceptable salt thereof dispersed in a matrix of a hydrophobic material comprising a substance which is melted or sofened during the preparation of said matrix said substance being selected from the group consisting of a natural wax, a natural oil, a synthetic wax, a synthetic oil, and mixtures of any of the foregoing; - and thereafter curing said matrix at a temperature from about 35°
C. to about 65°
C. for a sufficient time such that an endpoint is reached at which said matrix provides a stable dissolution profile, said endpoint being determined by comparing the dissolution profile of said matrix immediately after curing to the dissolution profile of said matrix after exposure to accelerated storage conditions of at least one month at 40°
C. and 75% relative hmidity.
- and thereafter curing said matrix at a temperature from about 35°
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38. A stabilized sustained release tablet containing tramadol as an active ingredient, comprising an effective amount of tramadol or a phabmaceutically acceptable salt thereof dispersed in a matrix of a hydrophobic materal comprising a substance which was melted or softened during the preparation of said matrix, said substance being selected from the group consisting of a natural wax, a natural oil, a synthetic wax, a synthetic oil, and mixtures of any of the foregoing, said tablet being cured at a temperature from about 35°
- C. to about 65°
C. for a sufficient time such that an endpoint is reached at which said solid dosage form provides an in-vitro dissolution profile after said dosage form is subjected to accelerated storage conditions of at least one month at 40°
C. and 75% relative humidity in which the total amount of tranadol released does not vary at any given dissolution time point by more than about 20% of the total amount of tramadol released at that dissolution time point prior to subjecting said dosage form to accelerated storage conditions.
- C. to about 65°
Specification