Subjects will be asked to take a pill (pseudoephedrine or placebo) between 45 and 120 minutes before hyperbaric oxygen therapy. Subjects' ears will be examined before and after therapy and be asked to assess ear pain. There will be no further tests or procedures after completion of therapy session and ear examinations.
The purpose of this research is to study whether the use of pseudoephedrine can help prevent middle ear trauma during HBOT. Pseudoephedrine is an approved drug that is used for temporary relief of nasal or sinus pain and pressure.