iv tigan??

Another nurse and I were covering patients for a nurse who was late for work. One of her patients was ordered iv Tigan . The patient was retching loudly and had already received a prn dose of zofran a few hours earlier as well as phenergan a few hours before that. She had a new order for Tigan which had not yet been given since ordered.(This patient had history of gastroparesis and had chronic nausea). I've never given Tigan IV or heard of it given intravenously--only PR. The other nurse who was covering was trying to be helpful and drew it up and handed me the syringe and said "here". I said " I've never given that--I don't know how fast or if it gets diluted. She said-"oh, I've given it-it can be given straight undiluted as a push." As we learned in nursing school--Don't give a drug that you don't know about--how to give, side effects,etc. or that you didn't draw up. The patient received the dose and within 30 minutes was confused for the remainder of the night. I later found the vial that the other nurse used and it said for IM USE ONLY! I called pharmacy and he said that it can also be used for IV. I still didn't feel right after reading that label. I looked up the literature and EVERY REFERENCE listed administration routes as IM or ORAL!! The physician was informed and proceded to order mental status change work-up (ABG, Chem 7 ) despite being told about IV Tigan given. I spoke to our floor's unit pharmacist in the morning and she said it should not be given IV. It was ordered as IV, transcribed as IV by pharmacy on the CMAR and delivered to our floor with computerized label that indicated IV route (the vial itself said IM use only as I said before). Luckily the patient's confusion gradually wore off over the course of the night. Don't rely on another person to tell you about a drug that you don't know about-- Remember-the person giving the drug has the ultimate responsibility!! Take the time and look up the drugs!!