 On the first and second visit days when you receive the nasal spray you will be advised to drink no more than 1 glass of fluid approx. 8 oz to prevent excess water retention in response to AVP, and refrain from caffeine consumption two hours before coming to the experiment. On each return visit you will be asked about any medications you may have taken since the last visit. If you have taken any new prescription medication or recreational substances you will not be able to proceed with the study. You will have your blood pressure and temperature measured at baseline, before administration of study drug pre-dose, again at 5 minutes after study drug administration post-dose, 20 minutes post dose and 60 minutes post dose. Although it is unlikely, if there are any changes in your blood pressure or body temperature Dr. Price will facilitate the need for any medical attention. If you are feeling well and there are no changes in your blood pressure, pulse or body temperature, you will be able to leave approximately one hour after study drug administration. 