These refer to different routes of Ketamine administration.  IV refers to giving the Ketamine intravenously, which an infusion nurse helps to prepare.  IM refers to giving an injection of Ketamine intramuscularly, usually into the arm.  PO refers to taking Ketamine in oral form, often a Ketamine lozenge which slowly dissolves in your mouth for 10-12 minutes.  Subcutaneous is an injection given right under the skin, often in the abdominal region.  Intranasal refers to a Ketamine spray given in the nostrils.  We are currently only offering IM and PO routes of administration.  We plan to offer IV and subcutaneous routes in the future. We will go over the unique aspects of each route of administration with you, and will recommend a specific treatment plan based on your needs and preferences.