Allergan Touts Ubrogepant Phase III Success, But Liver Tox Concerns Overhang

Questions loom as to whether Allergan's pair of CGRP antagonists will face the liver toxicity issues that previously plagued oral CGRP drugs. The firm is counting on the migraine therapies to help offset revenues lost to generics.

Profile of a human head with a colorful symbol of neurons in the brain

Allergan PLC tried to focus on the positive Phase III data released for its acute migraine candidate ubrogepant during the firm's quarterly earnings call Feb. 6, but analysts and investors seem concerned about elevated liver enzyme cases seen in the study that Allergan maintains are not drug-related.

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