Transdermal delivery system

Abstract

The invention relates to transdermal therapeutic system for the transdermal administration of buprenorphine, comprising a buprenorphine-containing self-adhesive layer structure comprising A) a buprenorphine-impermeable backing layer, and B) a buprenorphine-containing pressure-sensitive adhesive layer on said buprenorphine-impermeable backing layer, the adhesive layer comprising a) at least one polymer-based pressure-sensitive adhesive, b) an analgesically effective amount of buprenorphine base or a pharmaceutically acceptable salt thereof, c) a viscosity-increasing substance in an amount of about 0.1% to about 8% of said buprenorphine-containing pressure-sensitive adhesive layer, and d) a carboxylic acid selected from the group consisting of oleic acid, linoleic acid, linolenic acid, levulinic acid and mixtures thereof, in an amount sufficient so that said analgesically effective amount of buprenorphine is solubilized therein to form a mixture including said viscosity-increasing substance, and wherein the carboxylic acid-, buprenorphine- and viscosity-increasing substance-containing mixture forms dispersed deposits in the said pressure-sensitive adhesive, and wherein said buprenorphine-containing pressure-sensitive adhesive layer is the skin contact layer.

1 . A transdermal therapeutic system for transdermal administration of buprenorphine, comprising a buprenorphine-containing self-adhesive layer structure comprising
 A) a buprenorphine-impermeable backing layer, and   B) a buprenorphine-containing pressure-sensitive adhesive layer on said buprenorphine-impermeable backing layer, said adhesive layer comprising
 a) at least one polymer-based pressure-sensitive adhesive based on polysiloxanes or polyisobutylenes, 
 b) an analgesically effective amount of buprenorphine base or a pharmaceutically acceptable salt thereof, 
 c) a viscosity-increasing substance in an amount of about 0.1% to about 8% of said buprenorphine-containing pressure-sensitive adhesive layer, and 
 d) a carboxylic acid selected from the group consisting of oleic acid, linoleic acid, linolenic acid, levulinic acid and mixtures thereof, in an amount sufficient so that said analgesically effective amount of buprenorphine is solubilized therein to form a mixture including said viscosity-increasing substance, and wherein said carboxylic acid-, buprenorphine- and viscosity-increasing substance-containing mixture forms dispersed deposits in said pressure-sensitive adhesive, and 
   
       wherein said buprenorphine-containing pressure-sensitive adhesive layer is the skin contact layer. 
     
     
         2 . The transdermal therapeutic system of  claim 1 , wherein said buprenorphine is present in the form of buprenorphine base and/or wherein said carboxylic acid is levulinic acid. 
     
     
         3 . The transdermal therapeutic system of  claim 1 , wherein said buprenorphine is present in the form of buprenorphine base, said carboxylic acid is levulinic acid and said polymer-based pressure-sensitive adhesive is based on polysiloxanes. 
     
     
         4 . The transdermal therapeutic system of  claim 1 , wherein said viscosity-increasing substance is present in an amount of about 0.1% to about 7%, or of about 0.5% to about 5%, or of about 1% to about 4%, or of about 2% to about 3% of said buprenorphine-containing pressure-sensitive adhesive layer. 
     
     
         5 . The transdermal therapeutic system of  claim 1 , wherein said viscosity-increasing substance comprises one or more cellulose derivatives selected from the group consisting of methylcellulose, ethylcellulose, hydroxyethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, carboxymethylcellulose, sodium carboxymethylcellulose or microcrystalline cellulose. 
     
     
         6 . The transdermal therapeutic system of  claim 1 , wherein said viscosity-increasing substance comprises one or more high molecular mass polyacrylic acids, salts thereof or derivatives thereof. 
     
     
         7 . The transdermal therapeutic system of  claim 1 , wherein said viscosity-increasing substance comprises one or more of polyvinylpyrrolidone, colloidal silicone dioxide, sodium alginate, tragacanth, xanthan gum, bentonite, carageenan or guar gum. 
     
     
         8 . The transdermal therapeutic system of  claim 1 , wherein the viscosity-increasing substance is polyvinylpyrrolidone. 
     
     
         9 . The transdermal therapeutic system of  claim 8 , wherein the polyvinylpyrrolidone has a K-Value of at least about 80. 
     
     
         10 . The transdermal therapeutic system of  claim 1 , wherein said buprenorphine is present in the form of buprenorphine base, said carboxylic acid is levulinic acid, said polymer-based pressure-sensitive adhesive is based on polysiloxanes and said viscosity-increasing substance is soluble polyvinylpyrrolidone in an amount of about 1% to about 4%. 
     
     
         11 . The transdermal therapeutic system of  claim 1 , wherein said amount of said buprenorphine contained in the transdermal therapeutic system
 ranges from   about 1 mg to about 4 mg buprenorphine base or an equimolar amount of a pharmaceutically acceptable salt thereof, or   about 3.5 mg to about 8 mg buprenorphine base or an equimolar amount of a pharmaceutically acceptable salt thereof, or   about 6.5 mg to about 16 mg buprenorphine base or an equimolar amount of a pharmaceutically acceptable salt thereof, or   about 11.5 mg to about 24 mg buprenorphine base or an equimolar amount of a pharmaceutically acceptable salt thereof, or   about 15 mg to about 32 mg buprenorphine base or an equimolar amount of a pharmaceutically acceptable salt thereof.   
     
     
         12 . The transdermal therapeutic system of  claim 1 , wherein said buprenorphine-containing pressure-sensitive adhesive layer has a size that provides an area of release ranging from
 about 1 cm 2  to about 4.8 cm 2 , or   about 3 cm 2  to about 9.5 cm 2 , or   about 6 cm 2  to about 19 cm 2 , or   about 12 cm 2  to about 28.5 cm 2 , or   about 16 cm 2  to about 38 cm 2 .   
     
     
         13 . The transdermal therapeutic system of  claim 1 , wherein said buprenorphine-containing pressure-sensitive adhesive layer has a size that provides an area of release ranging from about 1 cm 2  to about 4.8 cm 2  and said amount of said buprenorphine contained in the transdermal therapeutic system ranges from about 1 mg to about 4 mg buprenorphine base or an equimolar amount of a pharmaceutically acceptable salt thereof,
 wherein said transdermal therapeutic system provides a nominal mean release rate of about 5 μg/hr over about 168 hours of administration.   
     
     
         14 . The transdermal therapeutic system of  claim 1 , wherein said buprenorphine-containing pressure-sensitive adhesive layer has a size that provides an area of release ranging from about 3 cm 2  to about 9.5 cm 2 , and said amount of said buprenorphine contained in the transdermal therapeutic system ranges from about 3.5 mg to about 8 mg buprenorphine base or an equimolar amount of a pharmaceutically acceptable salt thereof,
 wherein said transdermal therapeutic system provides a nominal mean release rate of about 10 μg/hr over about 168 hours of administration.   
     
     
         15 . The transdermal therapeutic system of  claim 1 , wherein said buprenorphine-containing pressure-sensitive adhesive layer has a size that provides an area of release ranging from about 6 cm 2  to about 19 cm 2  and said amount of said buprenorphine contained in the transdermal therapeutic system ranges from about 6.5 mg to about 16 mg buprenorphine base or an equimolar amount of a pharmaceutically acceptable salt thereof,
 wherein said transdermal therapeutic system provides a nominal mean release rate of about 20 μg/hr over about 168 hours of administration.   
     
     
         16 . The transdermal therapeutic system of  claim 1 , wherein said buprenorphine-containing pressure-sensitive adhesive layer has a size that provides an area of release ranging from about 12 cm 2  to about 28.5 cm 2 , and said amount of said buprenorphine contained in the transdermal therapeutic system ranges from about 11.5 mg to about 24 mg buprenorphine base or an equimolar amount of a pharmaceutically acceptable salt thereof,
 wherein said transdermal therapeutic system provides a nominal mean release rate of about 30 μg/hr over about 168 hours of administration.   
     
     
         17 . The transdermal therapeutic system of  claim 1 , wherein said buprenorphine-containing pressure-sensitive adhesive layer has a size that provides an area of release ranging from about 16 cm 2  to about 38 cm 2 , and said amount of said buprenorphine contained in the transdermal therapeutic system ranges from about 15 mg to about 32 mg buprenorphine base or an equimolar amount of a pharmaceutically acceptable salt thereof,
 wherein said transdermal therapeutic system provides a nominal mean release rate of about 40 μg/hr over about 168 hours of administration.   
     
     
         18 . The transdermal therapeutic system of  claim 1 , wherein said buprenorphine is present in the form of buprenorphine base and said system provides a mean cumulative skin permeation rate measured in a Franz diffusion cell with dermatomed human skin of more than 1.3 μg/cm 2 -hr over a 168 hours test and/or provides a cumulative release of buprenorphine base as measured in a Franz diffusion cell with dermatomed human skin of 220 μg/cm 2  to 640 μg/cm 2  over a time period of 168 hours. 
     
     
         19 . The transdermal therapeutic system of  claim 1 , wherein said buprenorphine is present in the form of buprenorphine base and said system provides a non-cumulative release of buprenorphine base as measured in a Franz diffusion cell with dermatomed human skin of
 2 μg/cm 2  to 10 μg/cm 2  in the first 8 hours,   20 μg/cm 2  to 80 μg/cm 2  from hour 8 to hour 24,   20 μg/cm 2  to 80 μg/cm 2  from hour 24 to hour 32,   30 μg/cm 2  to 120 μg/cm 2  from hour 32 to hour 48,   40 μg/cm 2  to 150 μg/cm 2  from hour 48 to hour 72,   100 μg/cm 2  to 300 μg/cm 2  from hour 72 to hour 144, and   30 μg/cm 2  to 100 μg/cm 2  from hour 144 to hour 168.   
     
     
         20 . The transdermal therapeutic system of  claim 1 , wherein said transdermal therapeutic system provides a mean AUCt per area of release of more than 1,700 pg·hr/ml-cm 2  over about 168 hours of administration after a single-dose administration to a subject population. 
     
     
         21 . The transdermal therapeutic system of  claim 1 , wherein said buprenorphine base-containing pressure-sensitive adhesive layer comprises an anti-oxidant selected from the group consisting of ascorbyl palmitate, tocopherol and esters thereof, ascorbic acid, butylhydroxytoluene, butylhydroxyanisole, propyl gallate and mixtures thereof. 
     
     
         22 . The transdermal therapeutic system of  claim 21 , wherein said anti-oxidant is ascorbyl palmitate and is present in an amount of from about 0.01 to about 0.5% of said buprenorphine-containing pressure-sensitive adhesive layer. 
     
     
         23 . A method of treating pain in a patient comprising applying a transdermal therapeutic system for transdermal administration of buprenorphine to the skin of said patient, wherein said transdermal therapeutic system comprises a buprenorphine-containing self-adhesive layer structure comprising
 A) a buprenorphine-impermeable backing layer, and   B) a buprenorphine-containing pressure-sensitive adhesive layer on said buprenorphine-impermeable backing layer, said adhesive layer comprising
 a) at least one polymer-based pressure-sensitive adhesive based on polysiloxanes or polyisobutylenes, 
 b) an analgesically effective amount of buprenorphine base or a pharmaceutically acceptable salt thereof, 
 c) a viscosity-increasing substance in an amount of about 0.1% to about 8% of said buprenorphine-containing pressure-sensitive adhesive layer, and 
 d) a carboxylic acid selected from the group consisting of oleic acid, linoleic acid, linolenic acid, levulinic acid and mixtures thereof, in an amount sufficient so that said analgesically effective amount of buprenorphine is solubilized therein to form a mixture including said viscosity-increasing substance, and wherein said carboxylic acid-, buprenorphine- and viscosity-increasing substance-containing mixture forms dispersed deposits in said pressure-sensitive adhesive, and 
   
       wherein said buprenorphine-containing pressure-sensitive adhesive layer is the skin contact layer. 
     
     
         24 . The method  claim 23 , wherein said transdermal therapeutic system is applied on the skin of the patient for about 168 hours. 
     
     
         25 . The method of  claim 23 , wherein said buprenorphine is present in the form of buprenorphine base and/or wherein said carboxylic acid is levulinic acid 
     
     
         26 . The method of  claim 23 , wherein said buprenorphine is present in the form of buprenorphine base, said carboxylic acid is levulinic acid and said polymer-based pressure-sensitive adhesive is based on polysiloxanes. 
     
     
         27 . The method of  claim 23 , wherein the viscosity-increasing substance is polyvinylpyrrolidone 
     
     
         28 . The method of  claim 27 , wherein the polyvinylpyrrolidone has a K-Value of at least about 80. 
     
     
         29 . The method of  claim 23 , wherein said buprenorphine is present in the form of buprenorphine base, said carboxylic acid is levulinic acid, said polymer-based pressure-sensitive adhesive is based on polysiloxanes and said viscosity-increasing substance is soluble polyvinylpyrrolidone in an amount of about 1% to about 4%. 
     
     
         30 . The method of  claim 23 , wherein said transdermal therapeutic system provides a mean AUCt per area of release of more than 1,700 pg·hr/ml-cm 2  over about 168 hours of administration after a single-dose administration to a subject population.