To date, therapies for multiple sclerosis (MS) focus on modifying or suppressing the immune system rather than on remyelination. Recent findings have pointed to the κ-opioid receptor (KOR) as a therapeutic target for remyelination, but several KOR agonists have undesired side effects that limit their use. Researchers from the Victoria University of Wellington have tested KOR agonists derived from U-50488 in the preclinical setting for the management of MS.