This was a single ascending dose, randomized, double-blind study assessing the safety, tolerability, pharmacokinetics, and pharmacodynamics of danicopan in healthy participants. Four different doses (200 milligrams [mg], 600 mg, 1200 mg, 2400 mg) and dose-matched placebo were administered under fasted and fed conditions.

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.