The UV-stable solid transdermal therapeutic system (TTS) with UV absorber for photosensitive active pharmaceutical ingredients has a backing layer (1), at least one active ingredient-containing matrix (2), and a detachable protective film (3). Optionally an adhesive layer (4) and a separating layer (5) are introduced between the backing layer (1) and the at least one active ingredient-containing matrix (2). At least one hydroxyphenyltriazine compound acting as UV absorber is embedded in the backing layer (1), in the active it matrix (2), or in the adhesive layer (4). The TTS according to the invention achieves high stability at low concentrations of UV absorber, preferably 0.5 to 3% (m/m), so as to reduce or avoid skin irritation.
