Study Design:

This is a randomized, double-blind placebo-controlled Phase 1 single-dose dose-escalation study to assess the safety, tolerability and PK of oral inhalation of AHCQ in healthy participants.

Escalating single doses of AHCQ will be studied in healthy participants. The study drug will be administered by inhalation through the mouth, and participants will be encouraged to exhale through the nose. The study drug, AHCQ, will be administered starting at an initial dose of 20 mg (Cohort A1, 1 mL of 20 mg/mL AHCQ solution) with a proposed subsequent doses of 50 mg (Cohort A2, 1 mL of 50 mg/mL AHCQ).

Number of Participants (Planned):

Two dose levels are planned to be evaluated. Each cohort will comprise 8 participants (6 active, 2 placebo). Therefore, 16 participants will initially be planned to be enrolled in the study. Additional participants may be enrolled if one or more enrolled participants do not complete the study.