to the invention has the following advantages compared with conventional systems with photosensitive active ingredient content the protective effect provided by the hydroxyphenyltriazine compounds acting as uv absorber is enhanced the concentration of the hydroxyphenyitriazine compounds acting as uv absorber which is necessary to achieve a protective effect is reduced it is thus possible in particular to avoid or reduce the risk of possible skin irritation the invention is further illustrated and explained by the following examples two formulations 1 and 2 of a photosensitive active ingredient from the progestogens were prepared formulation 2 comprises an adhesive layer 4 and a separating layer 5 and the adhesive layer comprises 2 5 by weight of a uv absorbing substance from the hydroxyphenyltriazine compounds formulation 1 has no adhesive layer and no separating layer formulation 1 serves as comparative formulation both formulations comprise an active ingredient containing matrix 2 with a photosensitive progestogen and are equipped with a backing layer 1 of polyethylene resulting in a tts in each case formulation 2 has the following composition tinosorb u00ae s from ciba lampertheim is a uv absorber of the hydroxyphenyltriazine class to investigate the photo protective effect both formulations were irradiated with light having a uv spectrum of 300 800 nm for a period of up to 34 h the radiation source used was a xenon.