<prompt> Which of the following serum levels of lithium is therapeutic ?0.1-0.4 mmolL0.5-0.7 mmolL0.8-1.1 mmolLL2-1.5 mmolL  <response>: Ans. is c i.e., 0.8-1.1 mmolL Prophylactic level of lithium in bipolar disorder is 0.5-0.8 mEqL and therapeutic level in acute mania is 0.8-1.2 mEqL. 