Estimation of the Effect of Multiple Dose Ritlecitinib (PF-06651600) on the Pharmacokinetics of a Single Dose of Caffeine in Healthy Participants

Study Overview
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Brief Summary
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This will be a Phase 1, 2 period, fixed sequence, multiple-dose, open-label study of the effect of ritlecitinib on caffeine PK in healthy participants. Approximately 12 healthy male and/or female participants will be enrolled in the study.

Official Title
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A PHASE 1, 2-PERIOD, FIXED-SEQUENCE, MULTIPLE-DOSE, OPEN-LABEL STUDY TO ESTIMATE THE EFFECTS OF RITLECITINIB (PF-06651600) ON THE PHARMACOKINETICS OF A SINGLE DOSE OF CAFFEINE IN HEALTHY PARTICIPANTS

Conditions
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Healthy Participants

Intervention / Treatment
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* Drug: Caffeine
* Other: Ritlecitinib


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: -Male and female participants must be 18 to 55 years of age, inclusive, at the time of signing the ICD. -BMI of 17.5 to 30.5 kg/m2; and a total body weight >50 kg (110 lb). - Male and female participants who are healthy as determined by medical evaluation including medical history, physical examination, laboratory tests, and 12-lead ECG. Participants who are willing and able to comply with all scheduled visits, treatment plan, laboratory tests, lifestyle considerations, and other study procedures. Exclusion Criteria: Participants are excluded from the study if any of the following criteria apply: Evidence or history of clinically significant hematological, renal, endocrine, pulmonary, gastrointestinal, cardiovascular, hepatic, psychiatric, neurological, dermatological, or allergic disease (including drug allergies, but excluding untreated, asymptomatic, seasonal allergies at the time of dosing). History of febrile illness within 5 days prior to the first dose of investigational product. History of any lymphoproliferative disorder such as EBV related lymphoproliferative disorder, history of lymphoma, history of leukemia, or signs or symptoms suggestive of current lymphatic or lymphoid disease. Known presence or a history of malignancy other than a successfully treated or excised non metastatic basal cell or squamous cell cancer of the skin or cervical carcinoma in situ. Other medical or psychiatric condition including recent (within the past year) or active suicidal ideation/behavior or laboratory abnormality that may increase the risk of study participation or, in the investigator's judgment, make the participant inappropriate for the study. Participants who, according to the information provided on Drugs.com, would be at increased safety risk if dosed with caffeine. History of hypersensitivity to caffeine.

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 55 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
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Caffeine and Ritlecitinib<br>In Period 1 Day 1, participants will be dosed with a single oral administration of caffeine 100 milligram (mg) tablet. In Period 2 Day 1 to Day 7, participants will be dosed with a single oral administration of ritlecitinib 200 milligram (mg) tablet. On Day 8, participants will be dosed with caffeine 100 milligram (mg) tablet within 5 minutes after administration of a 200 milligram (mg) dose of ritlecitinib on the morning of Day 8. Dosing with oral 200 milligram (mg) ritlecitinib QD will continue until Day 9. | Drug: Caffeine<br>* 100milligram (mg) tablet taken orally in period 1 and period 2<br>Other: Ritlecitinib<br>* 200 milligrams (mg) taken orally once a day(QD) for 8 days<br>* Other names: PF-06651600;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Area under the plasma concentration-time profile from time 0 extrapolated to infinity (AUCinf) of caffeine |  | Day1 and Day8: Hour 0, 0.5, 1, 1.5, 2, 3, 4, 6, 8, 10, 12, 16, and 24. Day 8: Hour 36 and 48 | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Incidence of treatment-emergent adverse events |  | Baseline through Day 28 | 
| Incidence of clinically significant abnormalities in vital signs |  | Baseline through Day 11 | 
| Incidence of clinically significant abnormalities in clinical laboratory values |  | Baseline through Day 11 |