MSFinals-4966
A 23-year-old man is brought to the emergency department by ambulance after being found shouting at shoppers in a corner of a supermarket. He claims that the shoppers were trying to kill him and he sees coloured halos around the shop shelves. He has no past medical history. His vital signs are as follows: heart rate of 120 bpm, respiratory rate of 20/min, blood pressure of 130/90 mmHg, and temperature of 38°C. He is agitated, clammy to touch, and has dilated pupils despite adequate lighting. Both hands show a fine tremor. What drug overdose is responsible for his symptoms?