This was an open-label study to evaluate the absorption, distribution, metabolism, and excretion of radioactivity in healthy male participants following a single 150-milligram (mg) oral dose of carbon-14 ([14C])-ACH-014447 ([14C])-danicopan) containing approximately 100 microcuries (µCi) of [14C].

Key Inclusion Criteria:

• Healthy was defined as having no clinical relevant abnormalities identified by a detailed medical history, physical exam, blood pressure and pulse rate measurements, 12-lead electrocardiogram, and clinical laboratory tests.
• Body mass index of ≥ 18 and ≤ 30 kilograms (kg)/meter squared and weight of ≥ 50 kg and ≤ 100 kg.
• Regular daily bowel movements (that is, production of at least 1 stool per day).
• Non-smoker or ex-smoker who had not used tobacco or nicotine products for ≥ 3 months prior to screening.

Key Exclusion Criteria:

• History or clinically relevant evidence of significant cardiovascular, pulmonary, hepatic, renal, hematological, gastrointestinal, endocrine, immunologic, dermatologic, neurological, or psychiatric disease.
• History of conditions or procedures possibly affecting drug absorption or excretion. A history of appendectomy, cholecystectomy, and hernia repair was allowed if they were not associated with complications.
• Active bacterial infection or clinically significant active viral infection, a body temperature > 38°Celcius, or other evidence of infection on Day 1, or with a history of febrile illness within 7 days prior to Day 1.
• Healthy participants who had been exposed to significant radiation levels of > 5 millisieverts in the last year prior to screening.
• Clinically significant laboratory abnormalities at screening or Day -1, as well as absolute neutrophil counts, platelets, and hemoglobin outside of reference ranges.