Archives of General Psychiatry
Both lamotrigine and lithium were superior to placebo at prolonging the time to intervention for any mood episode (lamotrigine vs placebo, P =.02; lithium vs placebo, P =.006).
Lithium was superior to placebo at prolonging the time to a manic, hypomanic, or mixed episode (P =.006).
Lamotrigine was superior to placebo at prolonging the time to a depressive episode (P =.02).