A Study Evaluating Deucravacitinib Concentrations in the Breast Milk and Plasma of Healthy Lactating Female Participants

Inclusion Criteria

• Healthy female participants without, in the opinion of the investigator, clinically significant deviation from normal in medical history, physical examination, ECGs, vital signs, and clinical laboratory determinations.
• Body mass index (BMI) of 18.0 kg/m2 to 35.0 kg/m2, inclusive, and body weight ≥ 50 kg (110 lb), at screening. Given participants are postpartum, BMI accommodation up to 35.0 kg/m2 may be expected.
• Has well-established lactation (ie, at least 4 weeks postpartum) and can produce stable milk product (ie, approximately 3 oz per 3 hours at screening) using the methods required for the study.
• Is willing to exclusively pump breast milk for the 72-hour post dose period of milk collection during CRU confinement, and not to breastfeed or provide milk to infant until after CRU discharge (72 hours post dose).

Exclusion Criteria

• Presence or history of any clinically relevant abnormality, condition, or disease (such as liver disease or abnormal liver function tests, or cardiovascular or pulmonary diseases) that, in the opinion of the investigator, may affect absorption, distribution, metabolism, or elimination of the study intervention, that would prevent the participant from participating in the study, or which places the participant at unacceptable risk if she were to participate in the study.
• Current or recent (within 3 months of study intervention administration) clinically significant gastrointestinal disease that, in the opinion of the investigator, could impact upon the absorption of study intervention.
• Presence or history of mastitis, breast surgery or trauma, or other breast conditions, which are considered clinically significant by the investigator and/or, in the investigator's opinion, may significantly impact breastfeeding or collection of milk from one or both breasts.
• History of biliary disorders, including Gilbert's syndrome or Dubin-Johnson disease, except for isolated gallbladder issues, which are not by themselves exclusionary.
• Other protocol-defined Inclusion/Exclusion criteria apply.