de Groot A C, Conemans J
Contact Dermatitis. 1986 Apr;14(4):209-14. doi: 10.1111/j.1600-0536.1986.tb01226.x.
A case of an urticarial rash from delayed-type allergy to orally administered codeine is presented. The literature on contact allergy to codeine is reviewed, and the rôle of patch testing in drug eruptions discussed.