A Study to Assess the Pharmacokinetics, Safety, and Tolerability of Intranasally Administered Esketamine in Healthy Participants

1 spray of 14 percent of esketamine solution (14 mg of esketamine per 100 microlitre) will be administered intranasally by nasal spray pump in each nostril once (Treatment A-total dose: 28 mg), twice with 5 minutes interval (Treatment B-total dose: 56 mg), thrice with 5 minutes interval between each repeated sprays (Treatment C-total dose: 84 mg), thrice with 10 minutes interval between each repeated sprays (Treatment D-total dose: 84 mg) and 4 times with 10 minutes interval between each repeated sprays (Treatment E-total dose: 112 mg). Treatment A, B, C, D will be administered in Cohort 1; Treatment D will be administered in Cohort 2; and Treatment E will be administered in Cohort 3.

Single dose of oral placebo will be administered 5 minutes before the first intranasal spray of esketamine solution in the Treatment E of Cohort 3. Placebo solution (solution of water for injection with denatonium benzoate) will be administered intranasally solution by nasal spray pump in the Treatment F of Cohort 3.

Single 0.25-mg oral dose of triazolam will be administered 5 minutes before the first intranasal spray of placebo solution in the Treatment F of Cohort 3.