A 30-year-old male patient, John, presents to the clinic with his wife. She reports that John has been experiencing periods of extreme energy and euphoria, followed by episodes of deep depression over the past several months. During his manic episodes, John engages in risky behaviors such as excessive spending and reckless driving. During his depressive episodes, he isolates himself and has expressed feelings of hopelessness. Based on this scenario, what is the priority nursing action for John?