Prehospital Use of Forced Air Warming

Inclusion Criteria: * Age: Participant must be over 18 and under 45 years of age at the time of signing the informed consent. * Type of Participant and Disease Characteristics: Participants who are overtly healthy as determined by their medical history. The participants will be asked to fill out a health report stating to be healthy, using no relevant medication, and having no relevant allergies or hypersensitivity to the active substances or to any of the excipients of the medications used. * Weight: BMI under 30 kg/m2 * Sex and Contraceptive/Barrier Requirements: Both male and female participants can be included. Female participants of childbearing potential will be asked to take a pregnancy test to confirm the absence of pregnancy prior to study drug administration on both visit 1 and 2. * Informed Consent: Capable of giving signed informed consent which includes compliance with the requirements and restrictions listed in the informed consent form (ICF) and in this protocol. Exclusion Criteria: * Drugs: Concomitant use of sedatives, MAO-inhibitors, SSRI, ritonavir, cimetidine, chlorpromazine, phenytoin, erythromycin, itraconazole, platelet inhibitors, Apomorphine, alcohol (during the trial period) or other opioids or opioid antagonists (during the trial period). * History of drug dependency: Recent head injury (last. 12 months), known increased ICP, seizures or epilepsy * Other: Known reduced liver- or kidney function, reduced respiratory drive, known supraventricular t…