Study of the Efficacy, Safety, and Tolerability of Serlopitant for Pruritus (Itch) in Atopic Dermatitis

This is a double-blind, randomized, placebo-controlled study. Approximately 450 subjects will
be randomized in a 1:1:1 ratio to receive daily oral doses of serlopitant 1 mg, 5 mg, or
placebo for 6 weeks. During the screening period, subjects will be provided with an
electronic device for recording electronic diary (eDiary) assessments throughout the study.
This eDiary will be used to capture efficacy endpoint data and treatment information. At the
Baseline visit, eligible subjects will be randomized, and study drug dispensed beginning with
a loading dose of 3 tablets to be taken at bedtime that same day. Starting on Study Day 2,
subjects will take one tablet per day at bedtime. Treatment will continue for 6 weeks. The
primary efficacy endpoint will be assessed during Week 6. After completion of the 6-week
treatment period, all subjects will enter a 4-week follow-up period.

Inclusion Criteria:

- Male or female, age 13 years or older

- Pruritus prior to and during the initial screening period

- Diagnosis of atopic dermatitis

- Judged to be in good health in the investigator's opinion

Exclusion Criteria:

- Prior treatment with study drug or similar drug

- Pruritus due to another reason besides atopic dermatitis

- Presence of any medical condition or disability that could interfere with study

- History of hypersensitivity to serlopitant or any of its components

- Currently pregnant or male partner of pregnant female

- Females of childbearing potential who are unable or unwilling to use adequate
contraception or who are breast feeding