Transdermal therapeutic systems having improved stability and their production
This invention provides for, inter alia, a transdermal therapeutic system comprising at least one therapeutically active substance, which is oxidizable by hydroperoxides, wherein the amount of oxidative degradation of said active substances(s) and the corresponding formation of oxidative degradation products is reduced, which comprises one or more constituents of said transdermal therapeutic system being in contact with said active substance(s), wherein the sum of the peroxide number(s) (PON) of each of said constituents related to their percentage of the whole amount of said constituents as expressed by the formula ##EQU1## where N is the percentage content of the whole amount of said constituents in the TTS, n is the number of said constituents in the TTS, i is the running number PON is the peroxide number of each of the constituents, is not greater than 20.
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