Haloperidol is frequently used as first-line treatment for delirium. The Swiss Smarter medicine campaign recommends to favor non-pharmacological interventions and treatment of the underlying causes, in order to limit the use of haloperidol. When antipsychotics are necessary, they should be prescribed cautiously, taking into account contraindications and potential side effects. This article emphasizes the importance of history taking in patient with delirium before prescribing haloperidol.