A patient is prescribed Risperidone oral tablets to be taken twice daily. The prescription states the desired dose is 4 mg daily divided into two doses. The available tablet strength is 1 mg per tablet. How many tablets should the patient take per dose?

Choice A reason: Involuntary lip-smacking and facial grimacing are classic signs of tardive dyskinesia, not pseudoparkinsonism. These symptoms result from dopamine receptor supersensitivity in the nigrostriatal pathway after prolonged blockade and are often irreversible, unlike the symptoms associated with drug-induced parkinsonism.

Choice B reason: Acute muscle spasms, particularly those that result in abnormal posturing of the head or trunk, indicate acute dystonia. This is a rapid-onset extrapyramidal reaction that requires immediate intervention with anticholinergic medications like benztropine, whereas pseudoparkinsonism involves more generalized rigidity and slow movement patterns.

Choice C reason: The subjective and objective need to move, or the inability to remain seated, defines akathisia. While both are extrapyramidal symptoms caused by dopamine blockade, akathisia is a disorder of movement urgency, whereas pseudoparkinsonism mimics the motor deficits of idiopathic Parkinson’s disease.

Choice D reason: Pseudoparkinsonism is characterized by a constellation of symptoms including "lead-pipe" muscle stiffness, a shuffling gait with a narrowed base, and a mask-like facial expression. These symptoms are caused by the blockade of dopamine D2 receptors in the basal ganglia by antipsychotic medications.

Choice A reason: Taking 8 tablets per dose would mean the patient receives 8 mg twice a day, totaling 16 mg daily. This is 4 times the prescribed 4 mg daily amount. Such a high dose would place the patient at extreme risk for severe extrapyramidal symptoms, sedation, and significant metabolic disturbances.

Choice B reason: If the patient took 4 tablets per dose, they would receive 4 mg twice daily, totaling 8 mg per day. This is double the prescribed daily dose. While 8 mg is within the therapeutic range for some patients, the nurse must strictly follow the 4 mg total daily order as written.

Choice C reason: To calculate the dose per administration, the total daily dose (4 mg) must be divided by the number of doses per day (2). This equals 2 mg per dose. Since the tablets are 1 mg each, the calculation is 2 mg / 1 mg = 2 tablets per dose to achieve the correct amount.

Choice D reason: Taking 6 tablets per dose would result in a total daily intake of 12 mg (6 mg per dose). This is 3 times the prescribed dose. Overdosing on risperidone can lead to life-threatening complications such as QTc interval prolongation, which can progress to dangerous cardiac arrhythmias like Torsade de Pointes.