A Study to Assess the Effect of Phenytoin on the Drug Levels of Afimetoran and the Effect of Afimetoran on the Drug Levels of Midazolam

Inclusion Criteria: * Body mass index (BMI) of 19.0 kilograms per meter squared (kg/m\^2) to 32.0 kg/m2, inclusive, and body weight ≥ 55 kg, at screening. Exclusion Criteria: * Any significant acute or chronic medical illness or any other condition listed as a contraindication in the phenytoin (Part 1) or midazolam (Part 2) package inserts. * History of seizure (including simple febrile seizure), epilepsy, severe head injury (including concussion), multiple sclerosis, or other known neurological condition which the investigator considers to be clinically significant. * Current or recent (within 3 months of study intervention administration) GI disease that could impact upon the absorption of study intervention. Other protocol-defined inclusion/exclusion criteria apply.