Pain constitutes the predominant motive prompting individuals to seek emergency medical attention, accounting for 80% of admissions to emergency departments. Presently, it is imperative to employ expeditious and efficacious analgesia-sedation methodologies, obviating the necessity for intravenous administration, while ensuring the secure delivery of pharmaceutical agents. The objective of this study is to assess the feasibility and comfort of nebulized intranasal or facial aerosol administration of Fentanyl through the implementation of a pharmacokinetic/pharmacodynamic (PK/PD) study