- Concurrent treatment with other medications that have CNS effects or that affect performance (e.g., antidepressants, antipsychotics, alpha-agonists, adrenergic blockers, lithium carbonate, sedating antihistamines, decongestant or sympathomimetics). Child should be off of previous psychotropic medications for a minimum duration of one week for stimulants, clonidine or guanfacine; two weeks for bupropion, tricyclic antidepressants, venlafaxine, SSRIs (except fluoxetine and citalopram), valproate; and three weeks for fluoxetine, citalopram, and neuroleptics.