The duration of the study for a participant will be up to approximately 7 weeks and include:~Screening period: up to 4 weeks (Day -28 to Day -2).~Institutionalization period at each period of treatment: 4 days (Day -1 to Day 3, single SAR443820 administration on Day 1).~Wash-out period: at least 5 days between each dosing.~End-of-study visit: Period 3/ Day 6±1 day.
Primary Objective:~To assess the pharmacokinetic parameters of SAR443820 after ascending single oral doses in healthy East Asian (Chinese and Japanese) adult participants.~Secondary Objective:~To assess the tolerability and safety of SAR443820 after ascending single oral doses in healthy East Asian (Chinese and Japanese) adult participants