Drug reaction with eosinophilia and systemic symptoms after ocrelizumab therapy.

We report here on a young woman with multiple sclerosis, who developed a condition with eosinophilia and swelling of limbs seven weeks after initiation of ocrelizumab treatment. We consider her drug reaction to be compatible with a drug reaction with eosinophilia and systemic symptoms (DRESS), also called drug-induced hypersensitivity syndrome. She was treated with antihistamine and corticosteroid treatments, and recovered fully within three months of symptom onset. Ocrelizumab was not re-initiated. We are not aware of other DRESS-like cases related to ocrelizumab treatment.