A Study of Single Ascending Doses of IW-3300 in Healthy Volunteers

This is a Phase 1, single-center, randomized, double-blind, placebo-controlled, single-ascending-dose study assessing the safety, tolerability, and pharmacokinetics (PK) of IW 3300 administered rectally as a low-volume enema in healthy adult volunteers. This first-in-human study will assess participants for safety, tolerability, and PK. The study includes up to 6 treatments: placebo and up to 5 dose levels of IW-3300 which will be determined after safety reviews of previous cohorts. This study will enroll a maximum of 40 participants (up to 5 cohorts of 8 participants each). The 8 participants within each cohort will be randomized in a double-blind manner to receive a single dose of IW-3300 (6 participants) or placebo (2 participants), administered rectally as a low-volume \[20 mL\] enema. Each cohort will progress through a Screening Period, Clinic Period, and Follow-up Period. Treatment duration will be 1 day. Participants will remain in the Phase 1 unit for approximately 24 hours after dosing and will be contacted by phone for follow-up approximately 2 weeks after dosing. Total participation will be 22 to 45 days, including the Screening, Clinic, and Follow-up Periods.