 Patients will be randomly assigned to receive a single dose injection of either Ranitidine 50 mg or placebo normal saline. Independently of the study injection, the patient will continue to receive the usual standard medical care for their stroke. The patient will be cared for by a team of doctors in the stroke service. Some of these doctors and nurses are investigators for this study and will assess the patients neurological status to see how much the stroke has affected the patient. They will also determine by the patients symptoms and the results of a chest x-ray if that test becomes necessary due to fever whether the patient has developed chemical pneumonitis They will also administer a questionnaire to the patient or their relative prior to discharge about their thoughts on doing clinical studies while being transported by the helicopter and to collect any thoughts they may have had about improving this process. Completing the questionnaire is voluntary, and the patient is free to skip any question that they would prefer to not answer. 