Elon Musk has defended his use of ketamine under a doctor's prescription, stating it helps manage his mental health and supports his demanding work at Tesla and SpaceX. In an interview, he emphasized that he takes a small dose biweekly to combat depression, which he believes may be genetic. Musk also addressed his late-night social media activity, asserting he is "almost always" sober while posting, and discussed the challenges facing X, including advertising struggles and content moderation policies.