A Study to Evaluate the Safety, Tolerability and Absorption to the Blood After Administration of Single and Multiple Doses of AZD8154 in Healthy Participants.

SAD Part 1; 6 cohorts which receive single dosing. One cohort is invited back for large particle administration. Part 2; 1 cohort which receives IV dose and then inhaled administration of AZD8154. MAD Part 3; 3 cohorts will receive inhaled multiple dosing. Additional doses are provisional and could be adjusted based on the emerging data from the previous dose by the safety review committee (SRC).