Naloxone nasal spray vs. injection: new study aims to improve overdose rescue

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Healthy male or female volunteers according to physical examination, vital signs (blood pressure, heart rate and body temperature), ECG and safety laboratory parameters and results should be within normal ranges or considered as non-clinically relevant by the investigator. 2. Age ≥ 18 and ≤ 55 years. 3. Body mass index (BMI) ≥ 18 and ≤ 30. 4. Able/willing to be compliant with the study restrictions. 5. Able to read Spanish and adhere to study requirements. 6. Signed informed consent prior to any study-mandated procedure. Exclusion Criteria: 1. \- Life-time substance use disorders (SUD) according to the Diagnostic and Statistical Manual of Mental Disorders (DSM-5). 2. \- Consumption of prescribed opiates (in the last 6 months). 3. \- Smoking. 4. \- History of or ongoing clinically relevant diseases or conditions. 5. \- Being under any administrative or legal supervision. 6. \- Pregnancy and breastfeeding 7. \- Positive blood or urine test for drugs of abuse or alcohol breath test prior to study drug administration. 8. \- Life-time history of mental diseases. 9. \- History of anxiety or depression not completely recovered within 12 months prior to study drug administration, as assessed by the Dual Diagnosis Screening Interview (DDSI). 10. \- Any other clinically relevant disease or condition that in the judgment of the investigator might interfere with the subject's ability to comply with study procedures or requirements and/or bias the interpretation of the study results and/or jeopardize the subject's safety. 11. \- Ongoing gastrointestinal diseases or history of gastrointestinal surgery affecting absorption. 12. \- Subjects with a clinically significant disease within one month prior to study drug administration. 13. \- Any clinically relevant findings in physical examination, vital signs, 12-lead ECG and safety laboratory parameters. 14. \- Positive hepatitis or HIV test. 15. \- Known hypersensitivity to any drug or drug excipients. 16. \- Use of drugs known to induce or inhibit hepatic drug metabolism (e.g., cimetidine) within one month prior to study administration or during the study and use of citrus juice during the study. 17. \- Any prescription or over-the-counter (OTC) product including herbal, homeopathic, vitamins, minerals and nutritional supplements within one week prior to study drug administration. 18. \- Intake of foods or beverages containing xanthine (more than 5 units of coffee, tea or cola drinks per day). 19. \- Donation of blood or plasma within one month prior to study drug administration or transfusion of blood or plasma for medical/surgical reasons or intention to donate blood or plasma within one month after study drug administration. 20. \- History of inadequate venous access and/or experience of difficulty donating blood. * Subject included in a clinical study within 3 months prior to study drug administration.