6. The participant is on any other medications other than antidepressants (except fluvoxamine), mood stabilizers (lithium, valproate, lamotrigine), or atypical antipsychotics (risperidone, lithium and/or valproate, the levels should be in the specified range: lithium (serum levels up to 1.2 mEq/L); valproate (serum levels up to 125 mcg/ml) at screening.