Study of a Single Dose of Danicopan in Healthy Participants

Inclusion Criteria: * Healthy defined as having no clinically relevant abnormalities identified by a detailed medical history, physical examination, blood pressure and pulse rate measurements, 12-lead electrocardiogram, and clinical laboratory tests. * Body mass index of 18 to 30 kilograms (kg)/meter squared with a minimum body weight of 50 kg. Exclusion Criteria: * History or clinically relevant evidence of significant cardiovascular, pulmonary, hepatic, renal, hematological, gastrointestinal, endocrine, immunologic, dermatologic, neurological, or psychiatric disease. * Any condition possibly affecting drug absorption (for example, gastrectomy), cholecystectomy to be considered acceptable. * Body temperature ≥ 38°Celcius on Day -1 or Day 1 Hour 0; history of febrile illness or other evidence of infection within 14 days prior to study drug administration. * Current tobacco/nicotine users; consumption of any alcohol within 72 hours before study drug administration or a history of regular alcohol consumption exceeding 21 drinks/week within 6 months of Screening; positive urine drug screen at Screening or Day -1. * Clinically significant laboratory abnormalities at either Screening or Day -1.