Olanzapine overdose may cause side effects in the cardiovascular system, nervous system, psychiatric system, and other systems. Overdose of olanzapine may result in breathlessness, shortness of breath, chest tightness, and possibly even respiratory depression symptoms. Delirium, irritability, convulsions, and even psychiatric symptoms such as aggressive behavior may also occur when olanzapine is taken in overdose. Olanzapine overdose may also cause neurological reactions such as fidgeting, slowed movement, tremors, and corns. Cardiovascular system manifestations in olanzapine overdose are mainly increased or decreased blood pressure, arrhythmia, and even cardiac arrest leading to death. Therefore, once the above symptoms occur, patients should immediately go to the local regular medical institutions.