A client who has been taking haloperidol for several weeks presents with restlessness, constant pacing, and inability to sit still. What is the most likely extrapyramidal symptom the client is experiencing?

Choice A reason: Tardive dyskinesia, an extrapyramidal symptom from long-term antipsychotic use like haloperidol, involves involuntary, repetitive movements such as grimacing, lip smacking, or tongue protrusion. These are caused by dopamine receptor hypersensitivity in the nigrostriatal pathway. The client’s restlessness and pacing do not match these motor tics, making tardive dyskinesia an unlikely explanation for the symptoms. Choice B reason: Dystonia, another extrapyramidal symptom, involves sustained muscle contractions causing abnormal postures, such as neck twisting (torticollis) or ocular deviation. It results from dopamine receptor blockade in the basal ganglia. The client’s symptoms of pacing and inability to sit still do not align with dystonia’s characteristic spasms, making it an incorrect choice for this presentation. Choice C reason: Akathisia is an extrapyramidal symptom characterized by subjective restlessness, constant movement, and inability to remain still, often described as an inner urge to move. Caused by dopamine receptor blockade in the nigrostriatal pathway from antipsychotics like haloperidol, it precisely matches the client’s pacing and restlessness, making it the most likely diagnosis requiring management. Choice D reason: Pseudoparkinsonism, induced by antipsychotics, mimics Parkinson’s disease with symptoms like tremor, rigidity, and bradykinesia, resulting from dopamine depletion in the basal ganglia. The client’s hyperactive pacing and restlessness contrast with the slowed movements of pseudoparkinsonism, making this an unlikely extrapyramidal symptom in this case, as the presentation is more dynamic.