| abstract |
The invention relates to transdermal therapeutic systems (TTS) whose structure consists of a polymer matrix, which contains active substances, and of a backing layer. The inventive systems comprise a content of at least one photosensitive active substance and are characterized in that said TTS contain at least one colorless substance. The colorless substance absorbs light in the UV region, does not have any inherent pharmacological action, is dispersed or dissolved in the polymer matrix of the TTS, and/or is homogeneously distributed in the backing layer of the TTS. |