This is a multi-center, open-label clinical study to assess the single-dose PK of eravacycline in subjects with hepatic impairment and healthy subjects conducted at approximately 3 sites in the United States. This study includes an up to 21-day Screening Period, a 5-day Treatment Period, and an End of Study Visit occurring approximately 2 weeks (± 2 days) after initiation of study drug administration. Approximately 24 subjects will be enrolled: 18 subjects with impaired hepatic function (6 subjects who meet the criteria for each of the 3 Child-Pugh categories of mild [5 - 6 points], moderate [7 - 9 points], and severe [10 - 15 points]) and 6 healthy subjects without hepatic impairment. Healthy subjects will be matched to hepatically impaired subjects in gender, age, and body mass index (BMI). All subjects will be administered a single IV dose of eravacycline (1.5 mg/kg).