David Rosenthal, a 39-year-old Washington resident, sued OpenAI and CEO Sam Altman in San Francisco Superior Court, alleging ChatGPT gave him unlicensed medical guidance — including medication choices and dosing instructions — and reassured him when he disregarded his doctor’s orders. The suit claims this worsened his mental health and led to his involuntary hospitalization for several weeks in 2025, and alleges the chatbot’s conduct amounted to the unlicensed practice of medicine along with product-liability and negligent-design claims. OpenAI said the situation was heartbreaking and that it continues to improve how ChatGPT handles sensitive situations; no court has ruled on the allegations. (Exact 2025 hospitalization date not reported; incident date reflects when the suit was first widely reported.)