Pharmacokinetics (PK) and Safety of Multiple Doses of Intranasal Naloxone in Healthy Adults

Inclusion Criteria: * Are able to consent and freely provide informed consent. * Females and males 18-55 years of age, inclusive. * Have a body mass index (BMI) less than or equal to 34.0 kg/m2. * Generally healthy, in the opinion of the Investigator, based on medical history, physical examination, vital signs, screening laboratory assessments and 12-lead ECG evaluation. * If female: 1. Have a negative pregnancy test at Screening (serum pregnancy test) and before dosing at Day -1 (urine pregnancy test) 2. Female subjects of non-childbearing potential must be: * Post-menopausal (spontaneous amenorrhea for at least 12 months prior to dosing) with confirmation by documented FSH levels ≥40 mIU/mL; or * Surgically sterile (bilateral oophorectomy, bilateral salpingectomy, hysterectomy, or tubal ligation) at least 3 months prior to dosing. 3. Women of childbearing potential who are not planning to be pregnant during the study period and who are using one of the following effective methods of contraception during the study period and for at least 30 days after last study visit: * Simultaneous use of hormonal contraceptive (e.g. oral, patch, depot injection, implant, vaginal ring, intrauterine device) or non-hormonal intrauterine device for at least 4 weeks prior to dosing (must agree to use the same contraceptive throughout the study) and condom for the male partner. * Simultaneous use of diaphragm or cervical cap with spermicide and condom for the male partner, started at least 21 days prior to dosing. Exclusion Criteria: * Subjects planning to become pregnant during the study or currently breastfeeding. * Any acute condition, in the opinion of the Investigator, that is not fully resolved at least 4 weeks prior to baseline. * Subject has a deviated septum, previous rhinoplasty, abnormal nasal anatomy, other nasal symptoms (i.e., blocked and/or runny nose), or other nasal surgeries (i.e., polyp removal) within 1 year, or needs to use another nasal spray product during study. * Subject with current upper respiratory infection (URI) or has had URI within 7 days prior to screening. * Subject has had an episode of epistaxis within 30 days prior screening or has experienced recurrent episodes of epistaxis within 1 year prior to screening. * Subject has used any prescription or nonprescription drugs/supplements with increased risk of bleeding within 28 days or 5 half-lives (whichever is longer) or complementary and alternative medicines within 28 days before the first dose of study drug with exception of oral contraceptives. All other prescription medications, over-the-counter, and natural health products within 14 days or 5 half-lives prior to the first dosing. * Subject is currently participating in another clinical study of an investigational drug or has been dosed with any investigational drug within 30 days or 5 half-lives (whichever is longer) of the compound.