Subjects were administered a single, daily oral dose of ST-246 (400 or 600 mg)and changes in safety parameteres were monitored. Safety parameters included adverse events, vital signs, physical examinations, laboratory tests (hematology, blood chemistry, and urinalysis) and electrocardiograms. The DAIDS AE grading table is a list of common terms and severity (intensity) of parameters used to describe adverse events occurring in NIAID-sponsored clinical studies/trials.

Evaluated safety parameters included: 1. physical examination/vital signs 2. electrocardiograms (heart rate, PR interval, QRS duration, QT interval, and QTc Bazett) 3. laboratory safety tests (hematology, chemistry, urinalysis) 4. adverse events (AEs) For a)-c), statistical values (mean, standard deviation, median, minimum, maximum) and changes from baseline (Day 1 pre-dose) to each time-point, were compared to laboratory normal reference ranges. If values for a)-d) were a Grade 3 or higher (in DAIDS AE Table)and ST-246-related, they were considered severe and significant, respectively.