Transdermal therapeutic system and method of use thereof for treating parkinsonism
View Patent ↗A substantially solvent-free matrix layer containing (−)-5,6,7,8-tetrahydro-6-[propyl-[2-(2-thienyl)ethyl]amino]-1-naphthalenol is produced by adding an active substance to an adhesive solution, coating the resultant active substance-containing adhesive solution onto a suitable sheet, and removing the solvents in a drying process to give said substantially solvent-free matrix layer.
1. A transdermal therapeutic system (TTS) comprising a self-adhesive matrix that comprises an acrylate-based or silicone-based polymer adhesive system having distributed therein (−)-5,6,7,8-tetrahydro-6-[propyl-[2-(2-thienyl)ethyl]amino]-1-naphthalenol free base in an amount of about 5% to 40% by weight of the matrix.
2. The TTS of claim 1 , wherein the matrix is substantially solvent-free.
3. The TTS of claim 1 , wherein the adhesive system is acrylate-based, comprising a polymer containing at least two types of monomer selected from the group consisting of acrylic acid, acrylamide, hexylacrylate, 2-ethylhexylacrylate, hydroxyethylacrylate, octylacrylate, butylacrylate, methyl-acrylate, glycidylacrylate, methacrylic acid, methacrylamide, hexylmethacrylate, 2-ethylhexylmethacrylate, octylmethacrylate, methylmethacrylate, glycidyl-methacrylate, vinylacetate and vinylpyrrolidone, at least one of said types being an acrylic or methacrylic acid derivative.
4. The TTS of claim 1 , said TTS being of sufficient size, when applied to skin of a subject, to administer a daily dose of the free base and to achieve thereby a therapeutic level of the free base.
5. The TTS of claim 4 , wherein the size of the TTS is 2 to 40 cm 2 .
6. The TTS of claim 4 , wherein the size of the TTS is approximately 20 cm 2 .
7. The TTS of claim 1 , wherein the free base is present in the matrix in an amount that makes available for transdermal delivery a 1-10 mg dose of the free base.
8. The TTS of claim 1 , wherein the matrix layer has a coat weight of approximately 50 g/m 2 .
9. The TTS of claim 1 , wherein the free base is present in the matrix layer in an amount of approximately 0.45 mg/cm 2 .
10. The TTS of claim 1 , wherein the adhesive system is silicone-based, comprising (a) an amine-resistant polydimethylsiloxane adhesive wherein methyl groups are optionally replaced by ethyl or phenyl groups, and (b) an additive having increased solubility for the free base, in an amount effective to increase dissolving capacity of the matrix for the free base.
11. The TTS of claim 1 , wherein the free base is present in an amount of about 5% to 25% by weight.
12. The TTS of claim 1 , wherein the free base is present in an amount of about 5% to about 15% by weight.
13. The TTS of claim 1 , wherein the free base is present in an amount of approximately 9% by weight.
14. The TTS of claim 1 , wherein the silicone adhesive is amine-resistant.
15. The TTS of claim 1 , wherein the silicone-based adhesive system comprises BIO-PSA Q7-4301 or BIO-PSA Q7-4201.
16. The TTS of claim 10 , wherein the additive comprises polyvinylpyrrolidone, a copolymer of vinylpyrrolidone and vinyl acetate, polyethylene glycol, polypropylene glycol, glycerol, a fatty acid ester of glycerol and/or a copolymer of ethylene and vinyl acetate.
17. The TTS of claim 10 , wherein the additive comprises polyvinylpyrrolidone in an amount of about 1.5-5% by weight of the matrix.
18. The TTS of claim 17 , wherein the polyvinylpyrrolidone is present in an amount of about 1.5% to 3% by weight of the matrix.
19. The TTS of claim 17 , wherein the polyvinylpyrrolidone is of type 90F.