| 摘要 |
What is disclosed is a transdermal therapeutic system for administration of an active ingredient through the skin, comprising: (a) a back layer, (b) a reservoir present on the back layer, comprising the active ingredient, polyisobutylene, a gel former and a plasticizer, a portion of the active ingredient in the reservoir being present in the form of undissolved particles and the content of gel formers in the reservoir being at most 4% by weight (based on the total weight of the reservoir), the active ingredient being fentanyl or an analog thereof.
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