The primary objective of the study is to determine the safety and tolerability of multiple doses of orally administered EDP-788. Secondary objectives of the study are to describe the pharmacokinetics of EDP-788 (and its metabolite EDP-322) after multiple doses of orally administered drug.

Three cohorts of subjects will be enrolled to receive either EDP-788 or placebo. The dose of EDP-788 will be increased with each successive cohort. In addition, a 4th cohort may be enrolled, depending on clinical findings (tolerability, safety, pharmacokinetics) observed in the first 3 cohorts. In each cohort, 8 subjects will receive a q12h oral dose regimen of EDP-788 (6 subjects) or placebo (2 subjects). All subjects receive multiple doses of study drug (EDP-788 or placebo).

Key Inclusion Criteria:

• In good general health
• BMI between 18 - 32 kg/m2
• Women must be of non-childbearing potential (surgically sterilized)
• Normal electrocardiogram
• Willing to abstain from strenuous physical exercise starting 3 days prior to admission to the study clinic through the 17 - 19 day post-dosing visit

Key Exclusion Criteria:

• Hypersensitivity to macrolide antibiotics
• Abnormal laboratory values
• Gastroenteritis within 1 week of study drug administration
• Use of any investigational drugs within 28 days of study drug administration
• History of gastrointestinal surgery which may interfere with drug absorption
• Active Hepatitis B, Hepatitis C, or HIV infection
• Use of prescription or non-prescription drugs within 14 days of study drug administration
• Use of nicotine within 3 months of study drug administration