Drug – bio-affecting and body treating compositions – Preparations characterized by special physical form – Web – sheet or filament bases; compositions of bandages; or...
Patent
1984-06-29
1987-11-03
Griffin, Ronald W.
Drug, bio-affecting and body treating compositions
Preparations characterized by special physical form
Web, sheet or filament bases; compositions of bandages; or...
424DIG14, 604897, 514953, 514965, A61K 922, A61K 926
Patent
active
047042826
ABSTRACT:
A transdermal therapeutic system using a subsaturated matrix is provided having improved approved release characteristics. Reinforcing means preferably in the form of a fabric are embedded in the upper surface of the subsaturated matrix. At least a portion of the reinforcing means is selected such that the active agent to be delivered to the skin has a solubility, C.sub.r therein which is lower than the initial solubility C.sub.o of the agent in the matrix. In addition, the relationship between the diffusion coefficients of the agent in the matrix D.sub.m and the portion of reinforcing means D.sub.r and the solubilities is given by the relationship: D.sub.r .multidot.C.sub.r <D.sub.m .multidot.C.sub.o. In operation the agent dissolved in the reinforcing means acts as a secondary reservoir improving the release characteristics of the system. Specific embodiments of the invention are particularly adapted for scrotal and labial delivery of drugs such as testosterone and progesterone.
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Campbell Patricia S.
Eckenhoff James B.
ALZA Corporation
Griffin Ronald W.
Mandell Edward L.
Precivale Shelley
Stone Steven F.
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