Safety and Pharmacokinetic Study of Inhaled Esketamine in Healthy Volunteers

Participants will receive different number of consecutive Esketamine DPI inhalations, consider as a single dose. There will be dose escalation between cohorts.

"Participants will receive different dosing sequences of Esketamine DPI inhalations, consider as a single dose. There will be dose escalation between cohorts. Number of Esketamine DPI inhalations within a dosing sequence will be defined based on results from PART A of the study.~Dose: very low, low, medium, high."

"Participants will receive different cycle of treatment consisting of 4 dosing sequences administered within 2 weeks. There will be dose escalation between cohorts. Participants in this part will be randomized to receive Esketamine DPI or placebo in 3:1 ratio. Number of Esketamine DPI inhalations within a dosing sequence will be defined based on results from PART A and PART B of the study.~Dose: very low, low, medium, high."

"Participants will receive different cycle of treatment consisting of 4 dosing sequences administered within 2 weeks. Participants in this part will be randomized to receive Esketamine DPI or placebo in 3:1 ratio.~In each cohort, number of placebo inhalations within a dosing sequence will correspond to number of Esketamine DPI inhalations."