Which medication is indicated for anxiety disorders and does not have a sedative effect?

Buspirone is the appropriate choice for treating anxiety disorders while not producing a sedative effect. It belongs to the class of anxiolytics that act differently than traditional benzodiazepines, which are commonly associated with sedation. Buspirone primarily works as a serotonin receptor agonist, specifically impacting serotonin receptors in the brain, which helps to alleviate anxiety without causing drowsiness or sedation.

In contrast, other options like haloperidol, mirtazapine, and venlafaxine can have varying degrees of sedative effects. Haloperidol is an antipsychotic that can lead to sedation as a side effect. Mirtazapine is an antidepressant that has significant sedative properties, making it less suitable for someone needing anxiety relief without sedation. Venlafaxine is an antidepressant and can have some sedative effects, especially at higher doses, although it is effective for anxiety. Thus, buspirone's unique profile as an anxiolytic without sedation makes it the correct choice for managing anxiety disorders.