However, lamotrigine used for bipolar disorder in that study did have higher VT risk than commonly used antipsychotics (HR 1.243, P=0.02), with an absolute risk difference of about 0.09% at 1 year ...

In the case of bipolar disorder, the negative unpublished data made available on lamotrigine provide an important context for clinical practice and research.

lamotrigine, to examine the impact of those results on clinical interpretation of the utility of that agent in bipolar disorder.