Create a cartoon for this. Lithium, a common treatment for bipolar disorder with a therapeutic range of 0.6-1.2 mEq/L, can be remembered by associating "bi" with "two" nursing shift options. ½ day (6) vs 12 hours. Nurse John works at a bipolar clinic and they give him options to either work six-hour shifts or twelve-hour shifts. (You don't have to put all that writing, you can make it simpler. ) See more