Which of the following is a possible side effect of haloperidol?

• A. Weight gain
• B. Akathisia
• C. Impotence
• D. Dry mouth

Answer: (B)

Haloperidol is an antipsychotic medication commonly used to manage symptoms of schizophrenia and acute psychosis. One of the known side effects of haloperidol is akathisia, which is a condition characterized by a feeling of inner restlessness and an uncontrollable need to be in constant motion. This side effect arises from the drug's antagonistic action on dopamine receptors in the brain, especially in pathways associated with movement and motor control.

Akathisia typically presents as an inability to sit still, an urge to move, and can be distressing for patients. It is particularly important for healthcare providers to monitor for signs of akathisia in patients who are on haloperidol, as it can impact their overall quality of life and adherence to treatment.

Other side effects of haloperidol may include those mentioned in the question, but akathisia is especially notable as it directly relates to the pharmacological characteristics of how the medication interacts within the central nervous system.