Single-Dose Pharmacokinetics and Safety of Oral Lofexidine in Hepatically-Impaired Subjects

This is a Phase 1, open-label, parallel-group, single-dose study of lofexidine in 6 adult
subjects with mild hepatic impairment (Child Pugh score of 5 6), 6 adult subjects with
moderate hepatic impairment (Child Pugh score 7 9), 6 adult subjects with severe hepatic
impairment (Child Pugh score 10 15), and 6 control subjects with normal hepatic function with
mean age, body mass index (BMI), and gender distribution targeted to be similar to the
impaired hepatic function cohorts. Subjects will be confined to an inpatient facility from
the evening before dosing to 144 hours after dosing.

Subjects who successfully complete screening will report to the inpatient facility at an
appropriate time the evening before study drug administration (Day 1) to ensure a minimum 10
hour fast. The next morning (Day 1) while still fasting, subjects will receive a single, oral
dose of 400 µg lofexidine HCl (two 200 µg tablets). Blood samples will be collected for
pharmacokinetic (PK) analysis at multiple time points over the next 144 hours (Day 7). Pooled
urine samples will be collected at 0 3 hours, 3 6 hours, 6 12 hours, 12 24 hours, 24 48
hours, 48 96 hours, 96 120 hours and 120 144 hours post-dose. Safety will be assessed by
recording adverse events (AEs), measuring vital signs (blood pressure and pulse rate) and
clinical laboratory tests (chemistry, hematology, and urinalysis), recording 12 lead safety
and Holter electrocardiograms (ECGs), and performing physical exams.

Inclusion Criteria:

Site will evaluate each subject for criteria in detail, which will include:

1. Between ages of 18 to 65 years at enrollment with a BMI between 19 and 38 kg/m2,
inclusive.

2. Subject is eligible to enter the study if:

- Matched control subject: normal hepatic function and free from other clinically
significant illnesses or disease, and medical history, physical examination,
laboratory results, and other tests consistent with health, as determined by the
Investigator.

- Subject with mild hepatic impairment: Child-Pugh hepatic dysfunction staging
system score of 5-6 Points (Stage A) and medical history, physical examination,
laboratory results, and other tests consistent with their hepatic impairment, as
determined by the Investigator.

- Subject with moderate hepatic impairment: Child-Pugh hepatic dysfunction staging
system score of 7 9 Points (Stage B) and medical history, physical examination,
laboratory results, and other tests consistent with their hepatic impairment, as
determined by the Investigator.

- Subject with severe hepatic impairment: Child-Pugh hepatic dysfunction staging
system score of 10-15 Points (Stage C) and medical history, physical examination,
laboratory results, and other tests consistent with their hepatic impairment, as
determined by the Investigator.

Exclusion Criteria:

Site will evaluate each subject for criteria in detail, which will include:

1. The matched control subject has a history of clinically significant disease, including
cardiovascular, gastrointestinal (GI), renal, hepatic, pulmonary, endocrine,
hematologic, vascular, immunologic, metabolic, or collagen disease or the
hepatically-impaired subject has a history of clinically significant disease including
cardiovascular, GI, renal, pulmonary, endocrine, hematologic, vascular, immunologic,
metabolic, or collagen disease.

2. Abnormal cardiovascular exam at Screening, including any of the following:

- clinically significant abnormal ECG (e.g., second or third degree heart block,
uncontrolled arrhythmia, QTcF (Fridericia's correction) interval >450 msec for
males and >470 msec for females).

- heart rate <45 bpm or symptomatic bradycardia;

- systolic blood pressure <90 mmHg or symptomatic hypotension;

- blood pressure >160/100 mmHg; or

- prior history of myocardial infarction.

3. Subjects with hepatic impairment will not be eligible to participate in the study if
any of the following exclusion criteria also apply:

- Significant bleeding diathesis or esophageal bleeding within the last 8 weeks.

- Evidence of hepatic function deterioration within the last 4 weeks as indicated
by liver transaminases, alkaline phosphatase, and gamma-glutamyl transpeptidase
or a ≥50% worsening of serum bilirubin or prothrombin time.

- History of surgical portosystemic shunt.

- Prothrombin time >18 seconds.