A Pharmacokinetic Study of Intravenous and Intranasal Oxytocin in Healthy Subjects

The main purpose of this study is to sample blood and model the plasma pharmacokinetics (PK) of a single dose of intravenous (IV) oxytocin and a single dose of intranasal (i.n.) oxytocin.This is an unblinded study of subjects, all of whom will receive an intravenous (IV) infusion and intranasal (i.n.) dose of oxytocin (a naturally occurring hormone that is made in the brain) with blood samples taken thereafter in order to create a formula to describe the concentrations of oxytocin in the blood over time (pharmacokinetics).In this study healthy volunteers and people are recruited for a two day study. Each study participant will have 2 IV catheters placed (one in each arm) for the day of IV oxytocin dosing and 1 IV catheter on the day of i.n. oxytocin dosing. After placement of the IV catheters, an infusion of oxytocin will be given over a 30 minute period. Blood samples will be taken after the infusion begins and several times during and after the infusion. The blood will be drawn through the IV catheter not used for the oxytocin infusion. For the intranasal oxytocin administration day, 1 IV catheter will be placed and several blood samples will be taken after administration.

Inclusion Criteria:Male or female > 18 and < 75 years of age, Body Mass Index (BMI) <40.Generally in good health as determined by the Principal Investigator based on prior medical history, American Society of Anesthesiologists physical status 1 or 2.For healthy volunteers, normal blood pressure (systolic 100-140 mmHg; diastolic 60-90 mmHg) resting heart rate 45-90 beats per minute) without medication. For those with hypertension, blood pressure controlled with anti-hypertensive medication and with a resting heart rate 45-100 beats per minute.Female subjects of child-bearing potential and 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 total abstinence from heterosexual intercourse for a minimum of 1 full cycle before study drug administration.Exclusion Criteria:Hypersensitivity, allergy, or significant reaction to any ingredient of Pitocin®Any disease, diagnosis, or condition (medical or surgical) that, in the opinion of the Principal Investigator, would place the subject at increased risk (active gynecologic disease in which increased tone would be detrimental e.g., uterine fibroids with ongoing bleeding), compromise the subject's compliance with study procedures, or compromise the quality of the dataWomen who are pregnant (positive result for urine pregnancy test at visit 1), women who are currently nursing or lactating, women that have been pregnant within 2 yearsSubjects with neuropathy, chronic pain (being treated on a daily basis), diabetes mellitus, or taking benzodiazepines or pain medications on a daily basis.Subjects with current or history of ventricular tachycardia, atrial fibrillation or prolonged QT interval.Subjects 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, Selective serotonin reuptake inhibitors (SSRI's) , Monoamine oxidase inhibitors (MAOI), or the recreational drug ecstasy.Subjects with a known latex allergy.History of chronic nasal obstruction or local pathology in nostril pathway which, in the opinion of the investigator, would prevent appropriate nasal administration of the study drug.Use of over the counter nasal products (ie. Saline spray, Neti-Pot, etc.) or intranasal corticosteroid medications during the study.