Study to Evaluate the Effect of Multiple-Dose Ritlecitinib on the Pharmacokinetics (PK) of Tolbutamide

A total of approximately 12 healthy male and/or female participants will be enrolled in the study to obtain at least 10 evaluable participants who complete the study. This is an open-label study not requiring an assessment of efficacy or pharmacodynamics markers, but it will include pharmacokinetic estimation drug-drug interactions.

Inclusion criteria

• Male and/or female participants who are healthy as determined by medical evaluation including medical history, full physical examination (including BP and pulse rate measurements), clinical laboratory tests, and 12-lead ECG.
• BMI of 17.5 to 30.5 kg/m2; and a total body weight >50 kg (110 lb).

Exclusion criteria

• Past/present clinically significant hematological, renal, endocrine, pulmonary, GI, CV, hepatic, psychiatric, neurological, dermatological or allergic disease (including drug allergies).
• Any condition possibly affecting drug absorption (eg, gastrectomy, cholecystectomy).
• Infection with hepatitis B or C viruses.
• Participants with any of the following acute or chronic infections or infection history: any infection requiring treatment within 2 weeks prior to the start of study participation; any infection requiring hospitalization or parenteral antimicrobial therapy within 60 days of the first dose of investigational product; any infection judged to be an opportunistic infection or clinically significant within the past 6 months of the first dose of investigational product; known active or history of recurrent bacterial, viral, fungal, mycobacterial or other infections; history of recurrent localized dermatomal herpes zoster, or history of disseminated (single episode) herpes simplex or disseminated herpes zoster.
• 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.