Oxytocin's nerve effects under the microscope in healthy volunteers

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

Inclusion Criteria: * In good health as determined by the Principal Investigator (PI) or co-investigators based on prior medical history, current psychiatric assessment, and clinical assessment of lab tests. * Female participants of child-bearing potential including those \< 1 year post-menopausal, must be practicing highly effective methods of birth control such as hormonal methods (e.g., combined oral, implantable, injectable, or transdermal contraceptives), double barrier methods (e.g., condoms, sponge, diaphragm, or vaginal ring plus spermicidal jellies or cream), or abstinence from heterosexual intercourse for a minimum of 1 full cycle before study drug administration. * Normal blood pressure (systolic 90-140 mmHg; diastolic 50-90 mmHg) resting heart rate 45-100 beats per minute) without medication. * Proficient in Swedish or English Exclusion Criteria: * Hypersensitivity, allergy, or a history of significant reaction to any ingredients of the active drug (Oxytocin Grindeks® 8.7 microgram/ml solution) or the placebo (Sodium Chloride , ATC code: V07AB). * Any disease, diagnosis, or condition (medical or surgical) that, in the opinion of the PI, would place the participant at increased risk (active gynecologic disease in which increased uterine tone would be detrimental e.g., uterine fibroids with ongoing bleeding), compromise the participant's compliance with study procedures, or compromise the quality of the data. * Women who are pregnant (positive result for urine pregnancy test at screening visit), women who are currently nursing or lactating, women that have been pregnant within 2 years. * Body Mass Index (BMI) \> 30 * Participants with neuropathy, chronic pain, diabetes mellitus, or taking benzodiazepines or pain medications on a daily basis. * Participants with current or history of ventricular tachycardia, atrial fibrillation or prolonged QT interval. * Participants with past or current history of hyponatremia or at risk for hyponatremia; anyone taking thiazide diuretics, loop diuretics, combination diuretics, lithium, carbamazepine, enalapril, ramipril, celecoxib, temazepam, gliclazide, glimepiride, glibenclamide, glipizide, omeprazole, pantoprazole, desmopressin, antidepressants (SSRI's or MAOI), or the recreational drug ecstasy. * Participants with a known latex allergy. * Participants with substances use disorders or any other psychiatric disorder(s). * Participant with high risk of fainting episodes.