terlipressin Mallinckrodt Receives a Complete Response Letter from the U.S. Food and Drug Administration (FDA) for Terlipressin for the Treatment of Hepatorenal Syndrome Type 1 (HRS-1) DUBLIN, Sept. 14, 2020 /PRNewswire/ — Mallinckrodt plc (NYSE: MNK), a global biopharmaceutical company, today announced that the U.S. Food and Drug Administration (FDA) has issued a Complete Response Letter (CRL) regarding the company’s New