Levothyroxine is a common agent which is used in thyroid replacement therapy. It has a large scale of symptoms in patients which expose to high doses. Most of the patients remains asymptomatic and only a small amount comes up with symptoms. There haven't been any established trade protocols for levothyroxine intoxication in adults. In this case, we report a 19 year old levothyroxin intoxication patient, required intensive care treatment. Patient had gastrointestinal lavage, activated charcoal, propylthiouracil, propranolol and prednisolone therapy. Patient didn't have any thyrotoxicosis symptoms and discharced.