Study of Inhaled Epinephrine and Intramuscular Epinephrine Administered to Healthy Adults

1. Male or female and ≥ 18 to ≤ 45 years of age at time of signing the Informed Consent Form.
2. BMI is between ≥18.00 to 29.00 kg/m2 with a minimum body weight of 45.0 kg.
3. Participant who is in good health based on the results of medical history, physical examination, vital sign measurements, and clinical laboratory evaluations, as assessed by the Investigator (or designee) with a resting heart rate of ≤ 90 beats per minute and systolic blood pressure of ≤ 130/90 mmHg and diastolic blood pressure of ≤ 90/50 mmHg.
4. Has normal lung function assessed using spirometry and defined by FVC ≥ lower limit of normal (LLN), FEV1/FVC ≥ LLN, and PIF ≥ LLN. (FVC- Functional Vital Capacity; FEV- Forced Expiratory Volume)
5. Has no history of anaphylaxis or severe allergy requiring the use of epinephrine.
6. Who is a non-smoker; or social smoker who only used nicotine on ≤ 5 occasions within 30 days prior to Screening, a negative cotinine test at Screening, and ability and willingness to refrain from tobacco products for the duration of the study (from 7 days prior to the first dose through to EOS [Visit 5]).

Exclusion Criteria:

1. Participant who is pregnant or lactating at Screening or planning to become pregnant (self or partner) at any time during the study (through Visit 5/EOS).
2. Participant has a history of significant hypersensitivity or intolerance to lactose.
3. Participant has a history or clinical manifestation of any metabolic, allergic, dermatological, hepatic, renal, haematological, pulmonary, cardiovascular, gastrointestinal, neurological, respiratory, endocrine, or psychiatric disorder, as determined by the Investigator (or designee) except for fully resolved childhood asthma.
4. Participant has a positive urine drug screen (including cotinine) at Screening and at Baseline (Visit 2/Day -1).
5. Participant has a positive COVID-19 test at Screening and prior to Baseline (Visit 2/Day -1)
6. Participant took part a clinical study involving administration of an investigational drug (new chemical entity) in the past 30 days or 5 half-lives prior to Baseline (Visit 2/Day -1).
7. Participant used or intends to use any prescription or non-prescription medications/products within 14 days prior to dosing through to Follow-up (Visit 5), with the exception of Oral contraceptive pill (OCPs) and paracetamol/acetaminophen (1 therapeutic dose [1g] three times per week) at the discretion of the Investigator, and contraceptives.
8. Participant has a history of alcoholism, substance or drug abuse-related disorders deemed significant by the Investigator (or designee) (ie, > 14 drinks/week for women or > 21 drinks/week for men [1 drink = 150 mL of wine or 360 mL of beer or 45 mL of hard liquor]) within the last 3 months prior to dosing, must not have consumed more than 14 drinks per week in any week or have a history of alcohol abuse within the last 12 months.
9. Participant has a positive alcohol breath test at Screening and prior to dosing with Investigational Product (IP) at Visit 2, Visit 3, and Visit 4.
10. Female participant has a positive urine pregnancy test prior to dosing with IP at Visit 2, Visit, 3, and Visit 4.
11. Participant has a positive test for HIV, hepatitis B surface antigen (HBsAg), or hepatitis C virus antibody (anti-HCV) with HCV RNA detected at Screening or Day 1 and hepatitis B core antibody (HBcAb) at Screening only.
12. Participant has presence of any physical or psychological medical condition that, in the opinion of the Investigator, would make it unlikely that the participant will comply with the protocol or complete the study per protocol.

13. Participant has received any of the following vaccinations:

    1. Live vaccine(s) within 1 month prior to Screening or plans to receive such vaccines during the study.
    2. Killed vaccine 1 week prior to Screening.
    3. COVID-19 vaccine Day -7 through to Visit 4.
14. Participant had surgery of the nose/paranasal sinuses/mouth/throat within 8 weeks prior to Screening.
15. Participant has any clinically relevant respiratory (especially with reduction of respiratory capacity) or cardiovascular abnormality (eg, high blood pressure, myocardial infarction in previous 3 months, etc), or any other abnormality that in the opinion of the Investigator may pose a safety risk to a participant in this study, may confound the clinical performance or safety assessment, or may interfere with study participation.