The purpose of this clinical research study is to learn more about the use of the investigational study drug, volixibat, for the treatment of pruritus (itching) associated with primary sclerosing cholangitis or PSC. Volixibat is a drug that is designed to lower circulating bile acid levels may lead to the itching in patients with PSC. Eligible patients will be randomly assigned to volixibat or to placebo for 28 weeks. This is a double-blind study, so the study doctors and participants will not know to which arm the participants are assigned. After completing 28 weeks of treatment, if eligible...
