For bipolar depression, the first-line therapy is lithium or _____

Fill in the blank(s) with correct word

lamotrignine: Bipolar depression can be difficult to recognize and distinguish from generalized depression. For bipolar depression, the first-line therapy is lithium or lamotrignine. Antidepressant monotherapy is not recommended due to the chance of starting a manic episode or inducing a pattern of rapid cycling. The evidence of long-term effectiveness of antidepressant therapy is weak.