Which finding denotes an adverse effect of haloperidol?

Haloperidol is an antipsychotic medication known for its potential to cause a range of adverse effects, particularly extrapyramidal symptoms. Akathisia is characterized by a feeling of inner restlessness and an uncontrollable need to be in constant motion. This condition is a common side effect associated with the use of typical antipsychotics like haloperidol, indicating a maladaptive response to the medication.

Paresthesia, anxiety, and excess tear production can occur due to various reasons, but they are not specifically tied to haloperidol's profile of adverse effects. Specifically, while anxiety could be a symptom seen in a patient with psychotic disorders or as part of a reaction to the medication, it is not a direct adverse effect of haloperidol. Paresthesia typically relates to neurological conditions or other types of pharmacological interactions, and excess tear production isn’t commonly related to haloperidol treatment. In contrast, akathisia specifically highlights the motor-related side effects that are well-documented for haloperidol, making it the most accurate indicator of an adverse effect in this context.