Pendular nystagmus associated with venlafaxine overdose: a forme fruste of the serotonin syndrome?

We describe a case of pendular nystagmus as a previously unreported side effect of venlafaxine, and speculate to its importance in the recognition of the serotonin syndrome. In particular, we discuss the importance of identifying incomplete forms of the syndrome, such as those presenting with predominantly ocular manifestations, as is in our case.