[Peroral long-term treatment of psoriasis using fumaric acid derivatives].

Oral treatment of psoriasis on an outpatient basis, using a preparation containing fumaric acid derivatives, was evaluated as initial monotherapy (3 months) and as long-term basic therapy (12-14 months) in 13 and 11 patients, respectively. The course of the disease was analysed in each individual case. After completion of both parts of the trial, half of the patients that had only responded poorly to conventional antipsoriatic therapy showed a significant improvement which occurred after several weeks of treatment. In 4 patients the medication had to be stopped because of abdominal pain. No severe side effects, particularly of a renal, hepatic or haematological nature, could be established. Studies in mice and rats disclosed only a low acute toxicity of the fumaric acid derivatives used. In additional analyses, hypotheses were dealt with concerning the mechanism of action of fumaric acid in psoriasis. To establish fumaric acid derivatives in the treatment of psoriasis, studies on chronic toxicity and pharmacokinetics will have to be conducted. Further clinical trials should evaluate a single fumaric acid derivative instead of mixtures.