Evaluation of the Safety and Pharmacokinetics of a Single Oral Dose of EDP-788

Subjects are enrolled in successive cohorts and are randomized to receive either EDP-788 or placebo capsules. If the safety profile of the drug is acceptable, based upon review of blinded data, the cohort receiving the next higher dose will be treated. Up to 8 cohorts will be recruited. All subjects receive a single dose of study drug (EDP-788 or placebo).

Subjects in Cohort C will receive a second single dose of study drug (EDP-788 or placebo) approximately 2 weeks after the first dose. The second dose will be administered as a liquid suspension rather than as a capsule formulation. The purpose of the second dose is to estimate the bioavailability of the capsule formulation relative to the suspension.

Subjects in Cohort E will receive a second single dose of study drug (EDP-788 or placebo) approximately 2 weeks after the first does. The second dose will be administered with a standard test meal. The purpose of the second dose is to estimate the effect of food on absorption of EDP-788.

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 8 - 10 day post-dosing visit

Key Exclusion Criteria:

• Hypersensitivity to macrolide antibiotics
• Abnormal laboratory values
• 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