Fentanyl Sublingual Spray in Opioid Naive Participants

For all cycles, blood will be drawn according to the following schedule:

The 0 time (pre-dose) blood sample will be collected within 60 minutes prior to first study drug administration.

Cohort l: 0 (pre-dose), 5, 15 and 30 minutes after the first dose and at 1, 2, 4 (prior to second-dose), 4.083, 4.25, 4.5, 5, 6, 8 (prior to third-dose), 8.083, 8.25, 8.5, 9, 10, 12, 16 and 24 hours after the first dose.

Cohort 2: 0 (pre-dose), 5, 15 and 30 minutes after the first dose and at 1, 2 (prior to second-dose), 2.083, 2.25, 2.5, 3, 4 (prior to third-dose), 4.083, 4.25, 4.5, 5, 6, 8, 10, 12, 16 and 24 hours after the first dose.

Cohort 3: 0 (pre-dose), 5, 15, 30 and 45 minutes after the first dose and at 1 (prior to second-dose), 1.083, 1.25, l.5, 1.75, 2 (prior to third-dose), 2.083, 2.25, 2.5, 2.75, 3, 4, 8, 12, 16 and 24 hours after the first dose.

Cohort 4: 0 (pre-dose), 5, 15, 30 (prior to the second-dose), 35, and 45 minutes after the first dose and at I (prior to the third-dose), 1.083, 1.25, 1.5, 1.75, 2, 2.25, 2.5, 2.75, 3, 4, 8, 12, 16 and 24 hours after the first dose.

Inclusion criteria

• Meets protocol-specified criteria for qualification and contraception
• Willing and able to remain confined in the study unit for the entire duration of each treatment period and comply with restrictions related food, drink and medications
• Voluntarily consents to participate and provides written informed consent prior to any protocol-specific procedures

Exclusion criteria

• History or current use of over-the-counter medications, dietary supplements, or drugs (including nicotine and alcohol) outside protocol-specified parameters
• Signs, symptoms or history of any condition that, per protocol or in the opinion of the investigator, might compromise:

• the safety or well-being of the participant or study staff
• the safety or well-being of the participant's offspring (such as through pregnancy or breast-feeding)
• the analysis of results