Safety and Tolerability, PK, and PD Study of Single and Multiple ALXN2080 Doses in Healthy Participants

Inclusion Criteria: * Healthy is defined as having no clinically relevant abnormalities identified by a detailed medical history, physical examination, blood pressure and heart rate measurements, 12-lead ECG, and clinical laboratory tests. * Body mass index (BMI) of 18 to 30 kg/m2 with a minimum body weight of 50 kg. BMI max is 32 kg/m2. * Male or female; female of childbearing potential and male participants agreed to follow protocol specified contraception guidance. Exclusion Criteria: * Significant history of or current cardiovascular, respiratory, hepatic, renal, gastrointestinal, endocrinological, hematological, or neurological disorders. * History of hypersensitivity to any ingredient contained in the study intervention. * Evidence of active infections, history of meningococcal infection, unexplained, or recurrent infection. * Known or suspected history of drug or alcohol abuse or dependence. * Current tobacco users or smokers. * Diseases or conditions or previous procedures known to interfere with the absorption, distribution, metabolism, or excretion of drugs. * For females: pregnant, breastfeeding, or intending to conceive during the course of the study.