Ved behandling af arthritis psoriatica var Arava mere effektivt end placebo, idet 59% af de patienter, der fik Arava, responderede på behandlingen sammenlignet med 30% for de patienter, der fik placebo.
In psoriatic arthritis, Arava was more effective than placebo, with 59% of the patients taking Arava responding to treatment, compared with 30% of those taking placebo.