A Study of Baricitinib and Omeprazole in Healthy Participants

Study Overview
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Brief Summary
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The main purpose of this study is to find out how the body will react to a study drug called baricitinib when taken with another drug called omeprazole. For each participant, this study will include 2 periods in fixed order. The study will last approximately 25 days, not including screening.

Official Title
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Evaluation of the Impact of Increased Gastric pH Following Omeprazole Administration on the Absorption of Baricitinib in Healthy Subjects

Conditions
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Healthy Volunteers

Intervention / Treatment
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* Drug: Baricitinib
* Drug: Omeprazole


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Overtly healthy as determined by medical history and physical examination Women not of childbearing potential due to surgical sterilization (at least 3 months after surgical hysterectomy, bilateral oophorectomy with or without hysterectomy, or bilateral tubal occlusion/ligation) confirmed by medical history, or menopause Have a body mass index of 18 to 29 kilograms per square meter (kg/m^2), inclusive, at screening Exclusion Criteria: Have known allergies to baricitinib, omeprazole, related compounds, or any components of the baricitinib or omeprazole formulations, or history of significant atopy Have a history of or current cardiovascular, respiratory, hepatic, renal, gastrointestinal, endocrine, hematological (including clotting disorders), or neurological disorders capable of significantly altering the absorption, metabolism, or elimination of drugs; of constituting a risk when taking the study medication; or of interfering with the interpretation of data Have an absolute neutrophil count (ANC) less than 2 × 10^9 cells per liter (L) [2000 cells/microliter (μL)] at screening or Day -1. For abnormal values, a single repeat will be allowed Intend to use over-the-counter or prescription medication (including drugs and substances known to alter gastric potential hydrogen (pH), such as proton pump inhibitors or over-the-counter antacid remedies and/or herbal supplements within 14 days prior to dosing and during the study (with the exception of hormone replacement therapy (HRT) and occasional paracetamol, which will be permitted at the discretion of the investigator), or intended use of vitamin supplements from Day 1 until discharge from the clinical research unit (CRU) Have used or intend to use any drugs or substances that are known to be substrates, inhibitors, or inducers of cytochrome P450 3A4 (CYP3A4) within 30 days prior to dosing and throughout the study Are unable to tolerate or unwilling to undergo insertion of a nasogastric pH probe for assessment of gastric pH during the study

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Baricitinib<br>Baricitinib - 10 milligram (mg) tablet administered orally, once, on Day 1. | Drug: Baricitinib<br>* Administered orally<br>* Other names: LY3009104;|
| Experimental: Baricitinib + Omeprazole<br>Baricitinib - 10 mg tablet administered orally, once, on Day 10. Omeprazole - 40 mg capsule administered orally once daily (QD) for 8 days (Days 3 through 10). | Drug: Baricitinib<br>* Administered orally<br>* Other names: LY3009104;Drug: Omeprazole<br>* Administered orally<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Pharmacokinetics (PK): Maximum Concentration (Cmax) of Baricitinib |  | Days 1 and 10: predose of baricitinib, 0.5, 0.75, 1, 2, 3, 4, 6, 12, 24, 36 and 48 hours postdose | 
| PK: Time of Maximum Observed Drug Concentration (Tmax) of Baricitinib |  | Days 1 and 10: predose of baricitinib, 0.5, 0.75, 1, 2, 3, 4, 6, 12, 24, 36 and 48 hours postdose | 
| PK: Area Under the Plasma Concentration-Time Curve From Time 0 Hour to Infinity [AUC(0-∞)] of Baricitinib |  | Days 1 and 10: predose of baricitinib, 0.5, 0.75, 1, 2, 3, 4, 6, 12, 24, 36 and 48 hours postdose |