Ubrogepant is a novel, oral calcitonin geneârelated peptide receptor antagonist currently under US Food and Drug Administration (FDA) review for the acute treatment of migraine attacks. This doubleâblind, fourâperiod crossover study compared the cardiac repolarization effect of therapeutic (100Â mg) and supratherapeutic (400Â mg) ubrogepant doses vs. placebo in healthy adults. Moxifloxacin 400Â mg was used as an openâlabel active control, and the primary end point was change from baseline in Fridericiaâcorrected QT intervals (ÎQTcF). Assay sensitivity was demonstrated via statistically significant QTcF prolongation with moxifloxacin vs. placebo. After single oral doses of ubrogepant, the least squares mean placeboâcorrected ÎQTcF (ÎÎQTcF) and 90% confidence intervals (CIs) did not exceed the 10âmillisecond regulatory threshold at any timepoint. The 90% CI upper bounds were 2.46Â milliseconds and 2.69Â milliseconds for ubrogepant 100 and 400Â mg, respectively. Categorical and concentrationâbased analyses were consistent with the primary result, showing no significant impact of ubrogepant on cardiac repolarization.