Very low-dose neuroleptic treatment in two patients with agitation associated with Alzheimer's disease.

Two agitated patients with Alzheimer's disease who either failed to respond or worsened with conventional low-dose neuroleptic and other pharmacologic treatment are described. Both patients demonstrated sustained improvement with very low-dose neuroleptics, one with haloperidol 0.125 mg and the other with thioridazine 5 mg. Clinical, pharmacokinetic, and pharmacodynamic factors that may have accounted for this response are discussed.