A participant will be eligible for study participation if the participant meets all of the following criteria:
1. Male and female participants aged between 18 to 65 years, inclusive.
2. Body weight ≥50 kg and body mass index (BMI) within the range of 18.0 to 30.0 kg/m2 (inclusive).
3. Participants must be healthy and without clinically significant abnormalities as assessed at screening and at first CRU admission visit.
4. No clinically significant abnormality on 12-lead ECG.
5. Normal blood pressures and pulse rate at screening and at first CRU admission visit.
6. If male, meets one of the following criteria:
1. Is able to procreate and agrees to use one of the accepted contraceptive regimens and not to donate sperm from the first study drug administration to at least 90 days after the last drug administration.
2. Is unable to procreate; defined as surgically sterile
7. If female, meets one of the following criteria:
1. Is of childbearing potential and agrees to use an acceptable contraceptive method.
2. Is of non-childbearing potential, defined as surgically sterile or is in a postmenopausal state.
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A participant will be excluded from the study if the participant meets any of the following criteria:
1. Female who is pregnant or plans to become pregnant, or who is lactating or plans to be lactating during the study.
2. Clinically significant cardiac, cardio- or cerebrovascular, respiratory, gastrointestinal, endocrine, hematologic, psychiatric, renal, hepatic, pulmonary, immunologic, dermatologic or nervous system disorders.
3. History of or current postural orthostatic tachycardia syndrome, or orthostatic hypotension at screening and at first CRU admission.
4. Current or history of psychiatric or psychotic diagnosis.
5. Evidence or history of suicidal ideation as per the C-SSRS administered at screening and at first CRU admission, violence, or homicidality.
6. Major surgery or open biopsy within 90 days prior to screening or expected/scheduled to have such procedure(s) performed during the study.
7. Any other conditions or unstable diseases/disorders which may affect the ability of the participant to comply with the protocol requirements, jeopardize the safety of the participant, or impact the interpretation of the study results.
8. Any clinical or laboratory measurements assessed by the Investigator as clinically relevant.
9. Positive blood screen for human immunodeficiency virus (HIV-1/2), hepatitis B surface antigen (HBsAg), or hepatitis C virus antibody (HCV Ab) at screening.
10. History of drug abuse or alcohol abuse within 12 months prior to Screening, and/or unwilling to refrain from such use throughout the study.
11. History of smoking or use of tobacco or other nicotine-containing products within 3 months prior to screening and unwilling to refrain throughout the study.
12. Use of medical or recreational cannabinoid use and unwilling to refrain throughout the study.
13. Positive drug screen for alcohol, cotinine, or illicit drug/substance of abuse.
14. Presence of acute conditions that could interfere with IN administration and drug absorption.
15. National Institute of Health (NIH) Toolbox Odor Identification test score of 0 at screening.
16. Current use of any drugs that may affect the absorption, metabolism, or elimination of study drugs, and that such treatment cannot be discontinued at least 4 weeks prior to screening and throughout the study.
17. Unwilling to refrain from intake of food or consumption of caffeine-containing drinks that affect CYP1A2 activity throughout the course of the study.
18. Use of any prescription medication within 14 days or 5 half-lives prior to the first dose of study drug or during the study unless approved by the Investigator. (Hormonal contraceptives or hormone replacement therapy are allowed.)
19. Use of any over-the-counter medications within 14 days or 5 half lives prior to Screening and throughout the study unless approved by the Investigator.
20. History of hypersensitivity or anaphylactic reactions to the active ingredient or any excipients of study drugs.
21. Received an investigational drug within 30 days or within 5 half-lives or twice the duration of the biological effect of the investigational drug in previous study prior to screening.
22. Inadequate or difficult venous access.
23. Donation of plasma in the 7 days prior to the first study drug administration, or donation of 500 mL or more of blood in the 56 days prior to the first study drug administration.
