The purpose of the study is to assess the efficacy and safety of ravulizumab for the treatment of adult participants with ALS.
Key Inclusion Criteria:
1. A diagnosis of sporadic or familial ALS, defined by the El Escorial criteria
(possible, laboratory-supported probable, probable, or definite ALS).
2. ALS onset ≤ 36 months from Screening.
3. Documented meningococcal vaccination not more than 3 years prior to, or at the time
of, initiating study treatment.
4. Upright slow vital capacity ≥ 65% predicted at Screening.
5. If on riluzole, participant must be on a stable dose for 30 days; if on edaravone,
participant must be on a stable dose for 60 days (2 cycles).
6. Body weight ≥ 40 kilograms at Screening.
7. Contraceptive use by men or women should be consistent with local regulations
regarding the methods of contraception for those participating in clinical studies.
Key Exclusion Criteria:
1. History of Neisseria meningitidis infection.
2. Human immunodeficiency virus (HIV) infection (evidenced by HIV 1 or HIV 2 antibody
titer).
3. Dependence on invasive or non-invasive mechanical ventilation.
4. Previously or currently treated with a complement inhibitor.
5. Exposure to an investigational drug or device within 30 days of Screening or 5 half
lives of the study drug, whichever is greater.