> We clearly don't actually understand why some medications work for some people but not others. There are plenty of psychoactive drugs where we have no unders

> We clearly don't actually understand why some medications work for some people but not others. There are plenty of psychoactive drugs where we have no understanding of why they work at all. Lithium is one of the oldest, most successful, and best known medications for bipolar disorder, major depression, and schizophrenia, and we have no idea which of the many effects it has on the body actually contribute to stabilizing mood.