Two patients on quinidine Durettes medication developed a photosensitive reaction 48 h after sun exposure. The reaction started with a pronounced oedema, followed by a reticulate daik blue discolouration; purpura developed in the discoloured areas. Patch tests and photo patch tests with quinidine sulphate and with quinidine Durettes were negative. As yet it has not been decided whether the quinidine or another constituent of the quinidine Durettes has caused the reaction.