 Ischemic or hemorrhagic stroke patients transferred by Air Care helicopters to the University of Iowa Hospitals and Clinics UIHC for further care will be invited to participate in a research study testing the following: 1 feasibility of beginning a research study while the patient is in transit to UIHC, and 2test efficacy of a low risk medication called, Ranitidine, to help lower the chances of developing chemical pneumonitis in patients that have had a stroke. 