Ionis Pharmaceuticals, Inc. announced that the U.S. Food and Drug Administration has granted Orphan Drug Designation to IONIS-HTTRx for the treatment of patients with Huntington's disease (HD). IONIS-HTTRx is the first therapy to enter clinical development that is designed to directly target the cause of the disease by reducing the production of the protein responsible for HD. IONIS-HTTRx has also been granted orphan drug designation by the European Medicines Agency for the treatment of patients with HD.

