This study examines the pharmacokinetic profile of Armstrong's proposed Epinephrine Inhalation Aerosol USP, an HFA134a propelled Metered Dose Inhaler (MDI) (E004), using a stable isotope deuterium-labeled epinephrine (epinephrine-d3) to differentiate the administered drug from the endogenous epinephrine, in healthy male and female adult volunteers.

The current study is designed to complement and expand the previous PK studies, API-E004-CL-B and API-E004-CL-B2, with emphasis on lower E004 dose strengths (at 90 and 100 mcg per inhalation), for a more thorough evaluation of the E004 PK profiles. Safety of E004 will also be evaluated, under augmented dose conditions.

Inclusion Criteria:

• Generally healthy at screening;
• Body weight ≥ 50 kg for men and ≥ 45 kg for women;
• Sitting blood pressure ≤ 135/90 mmHg;
• Demonstrating negative hIV, HBsAG and DCV-Ab screen tests;
• Women of child-bearing potential must be non-pregnant, non-lactating, and practicing a clinically acceptable form of birth control;
• Properly consented
• Other criteria apply

Exclusion Criteria:

• A smoking history of ≥10 pack-years, or having smoked within 6 months prior to Screening;
• Upper respiratory tract infections within 2 wk, or lower respiratory tract infection within 4 wk, prior to Screening;
• Any current or recent respiratory conditions that might significantly affect pharmacodynamic response to the study drugs;
• Known intolerance or hypersensitivity to the study MDI ingredients;
• Having been on other investigational drug/device studies, or donated blood, in the last 30 days prior to Screening;
• Other criteria apply