[Contact allergy due to the topical antiperspirant propantheline bromide (author's transl)].

After a treatment of 6 months with the antiperspirant Hydonan a contact dermatitis was found in the axillae of a 42 year-old soldier. Hydonan is a combination of 2 emphatic substances: aluminium hydrochloride and propantheline bromide. Aluminium hydrochloride is an adstringence substance, propantheline bromide is a topical active anticholinergic agent. As side-effect an irritation due to aluminium hydrochloride and a contact allergy due to propantheline bromide can occur. In our case there was a contact allergy to propantheline bromide 5% aq.