Det er muligt, at samtidig anvendelse af andre fotosensibiliserende midler (f. eks. tetracycliner, sulfonamider, phenothiaziner, hypoglykæmika af sulfonylurea- typen, thiazid- diuretika, griseofulvin og fluoroquinoloner) kan øge fotosensibiliseringsreaktionen.
It is possible that concomitant use of other photosensitising agents (e. g., tetracyclines, sulphonamides, phenothiazines, sulphonylurea hypoglycaemic agents, thiazide diuretics, griseofulvin and fluoroquinolones) could increase the photosensitivity reaction.