Acutely ill patients in a manic or depressed episode are randomly assigned to either individual psychotherapy or medication clinic visits in addition to appropriate pharmacotherapy (lithium carbonate). Patients who stabilize (HRSD and Bech-Rafaelsen < 7 for four weeks) are then randomly assigned to preventative treatment with either individual psychotherapy or medication clinic visits in addition to pharmacotherapy. Thus, patients in this study receive one of four possible treatment strategies: 1) preliminary phase psychotherapy followed by preventative phase psychotherapy; 2) preliminary phase medication clinic visits followed by preventative phase psychotherapy; 3) preliminary phase psychotherapy followed by preventative phase medication clinic visits in addition to psychotherapy; or 4) preliminary phase medication clinic visits followed by preventative phase medication clinic visits in addition to psychotherapy. Those patients who experience a relapse (during the initial twelve weeks of the preventative phase) or a recurrence (after week 12 of the preventative phase) are treated with appropriate pharmacotherapy and continued in psychotherapy or medication clinic visits as dictated by their original randomization assignment. These patients are then followed for the remainder of what would have been their time in the protocol had they remained well.