SAR443820

Single & Multiple Ascending Dose Study of SAR443820 in Healthy Adult Participants

A Study in Healthy Adult Male & Female Participants to Assess the Amount of the Study Medicine (SAR443820) Absorbed by the Body, When Given Orally in Fasted Condition as a Tablet Versus as a Capsule (Part 1) and When Given Orally as a Tablet in Fasted Condition Versus as a Tablet After Food (Part 2)

A Study to Assess the Effect of Erythromycin on the Test Medicine (SAR443820) When Given Orally as Tablets to Healthy Adult Male and Female Participants (Part A); and the Effect of Itraconazole on the Test Medicine (SAR443820) When Given Orally as Capsules to Healthy Adult Male Participants (Part B)

A Phase 1, open-label, single-center study to determine the absorption, distribution, metabolism, and excretion of a single oral dose of SAR443820 containing microtracer [14C]-SAR443820 in healthy male participants

Phase 2 Study for SAR443820 in Participants With Amyotrophic Lateral Sclerosis (ALS)

A Study to Evaluate the Effect of SAR443820 on Serum Neurofilament Levels in Male and Female Adult Participants With Multiple Sclerosis

A Phase 2 double blind, randomized, placebo controlled study evaluating the effect of SAR443820 on serum neurofilament levels in participants with multiple sclerosis, followed by an open-label long-term extension period