Controlled-Release Tolterodine Compositions and Methods
Controlled-release tolterodine compositions, including controlled-release particles, pellets, granules, and spheres, comprising an inert core, a first layer disposed on the inert core, and a second layer disposed on the first layer are described. Methods for preparing such compositions and methods of treating a variety of disorders are also disclosed.
1 . A controlled-release composition, comprising:
(i) an inert core comprising a water insoluble polymer;
(ii) a first layer disposed on the inert core, wherein the first layer comprises tolterodine or a pharmaceutically acceptable salt thereof and a binder; and
(iii) a second layer disposed on the first layer, wherein the second layer comprises a water insoluble polymer, a plasticizer, and a pore-forming agent.
2 . The controlled-release composition of claim 1 , wherein the first layer is disposed directly onto the inert core.
3 . The controlled-release composition of claim 1 , wherein the controlled-release composition exhibits a dissolution profile such that after 1 hour, about 1 to about 30% of the tolterodine is released; after 3 hours, about 40 to about 85% of the tolterodine is released; and after 7 hours, about 50 to about 100% of the tolterodine is released, wherein the dissolution is performed with 900 ml of pH 6.8 phosphate buffer at 37° C. in USP Type 1 Apparatus (USP, <711> Dissolution), at a paddle speed of 100 rpm.
4 . The controlled-release composition of claim 1 , wherein the controlled-release composition exhibits a dissolution profile that is substantially the same as that of DETROL® LA.
5 . The controlled-release composition of claim 1 , wherein the water insoluble polymer in the inert core is microcrystalline cellulose.
6 . The controlled-release composition of claim 1 , wherein the binder in the first layer is hydroxypropyl cellulose, hydroxypropylmethyl cellulose, carboxymethyl cellulose, methyl cellulose, hydroxyethyl cellulose, carboxyethyl cellulose, carboxymethylhydroxyethyl cellulose, polyvinyl pyrrolidone, polyethylene glycol, polyvinyl alcohol, polymethacrylates, or a combination comprising at least one of the foregoing polymers.
7 . The controlled-release composition of claim 1 , wherein the binder in the first layer is hydroxypropyl cellulose.
8 . The controlled-release composition of claim 1 , wherein the weight ratio between tolterodine and the binder in the first layer is about 5:1 to about 2:1.
9 . The controlled-release composition of claim 1 , wherein the weight ratio between tolterodine and the binder in the first layer is about 4:1 to 2:1.
10 . The controlled-release composition of claim 1 , wherein the water insoluble polymer in the second layer is ethyl cellulose, ethyl acrylate, methyl methacrylate, hydroxypropylmethyl cellulose phthalate, cellulose acetate phthalate, cellulose acetate trimellitate, or a combination comprising at least one of the foregoing polymers.
11 . The controlled-release composition of claim 10 , wherein the water insoluble polymer in the second layer is ethyl cellulose.
12 . The controlled-release composition of claim 1 , wherein the plasticizer in the in the second layer is diethyl phthalate, dibutyl phthalate, dibutyl sebacate, tributyl citrate, acetyl tributyl citrate, castor oil, mineral oil, glyceryl monostearate, and a combination comprising at least one of the foregoing plasticizers.
13 . The controlled-release composition of claim 12 , wherein the plasticizer is diethyl phthalate.
14 . The controlled-release composition of claim 1 , wherein the pore-forming agent is polyvinyl pyrrolidone, polyvinyl alcohol, hydroxyethyl cellulose, hydroxypropylmethyl cellulose, hydroxypropyl cellulose, methyl cellulose, carboxymethylcellulose, polyethylene glycol, or a combination comprising at least one of the foregoing polymers.
15 . The controlled-release composition of claim 14 , wherein the pore-forming agent is polyvinyl pyrrolidone.
16 . The controlled-release composition of claim 1 , wherein the second layer comprises a combination of ethyl cellulose, diethyl phthalate, and polyvinyl pyrrolidone.
17 . The controlled-release composition of claim 1 , wherein the amounts of the water insoluble polymer, the plasticizer, and the pore-forming agent in the second layer are about 65 wt % to about 75 wt %, about 3 wt % to 10 wt %, and about 10 wt % to 30 wt %, respectively, based on the total weight of the second layer coating.
18 . The controlled-release composition of claim 1 , wherein the amount of the second layer is about 5 wt % to about 20 wt % based on the total weight of the controlled-release composition.
19 . The controlled-release composition of claim 1 , wherein the amount of the second layer is about 9 wt % to 11 wt %, based on the total weight of the controlled-release composition.
20 . A controlled-release composition, comprising:
(i) an inert core consisting essentially of a water insoluble polymer;
(ii) a first layer coated on the inert core, wherein the first layer consists essentially of tolterodine or a pharmaceutically acceptable salt thereof and a binder; and
(iii) a second layer coated on the first layer, wherein the second layer consists essentially of a water insoluble polymer, a plasticizer, and a pore-forming agent.
21 . A method of producing a controlled-release composition of claim 1 , wherein the method comprises:
a) providing an inert core of a water insoluble polymer;
b) applying a first layer comprising tolterodine or a pharmaceutically acceptable salt thereof and a binder onto the inert core; and
c) applying a second layer comprising a water insoluble polymer, diethyl phthalate, and optionally a water soluble polymer onto the first layer;
wherein the tolterodine or a pharmaceutically acceptable salt thereof and the binder in step (b) are dissolved in a solvent comprising an alcohol and water for application.
22 . The method of claim 21 , wherein the alcohol and the water are present in a weight ratio of about 86:14 to about 94:6.