Table III. Evidence base for combinations of antipsychotics with lithium or anticonvulsants. Evidence base: +, positive in at least one placebo-controlled trial;?, no evidence available from clinical trials; -, negative results in clinical trials so far.

Drug	Lithium	Valproate	Carbamazepine	Lamotrigine
Chlorpromazine	?	?	?	?
Haloperidol	+	+	?	?
Clozapine	?	?	?	?
Risperidone	+	+	-	?
Olanzapine	+	+	-	?
Quetiapine	+	+	?	?
Ziprasidone	-	-	?	?
Aripiprazole	+	+	?	?
Asenapine	?	?	?	?