A nurse is reinforcing teaching with a client who has schizophrenia and a new prescription for haloperidol. The nurse should instruct the client to avoid taking which of the following medications?

Choice A rationale Docusate sodium is a stool softener that works by increasing water and fat absorption into the stool, making it softer and easier to pass. There is no known significant pharmacokinetic or pharmacodynamic interaction between docusate sodium and haloperidol that would necessitate avoiding its use. Choice B rationale Bupropion is an antidepressant that acts as a norepinephrine-dopamine reuptake inhibitor. Combining bupropion with haloperidol, a dopamine receptor antagonist, can be problematic. Bupropion lowers the seizure threshold and can exacerbate dopamine-blocking effects, potentially increasing the risk of adverse neurological events or reducing haloperidol's efficacy. Choice C rationale Diphenhydramine is an anticholinergic medication that can exacerbate the anticholinergic side effects of haloperidol, such as dry mouth, constipation, blurred vision, and urinary retention. This combination increases the risk of anticholinergic toxicity, which can manifest as confusion, delirium, and increased intraocular pressure. Choice D rationale Glucosamine is a naturally occurring amino sugar that supports cartilage health and is often used for osteoarthritis. There is no documented significant drug interaction between glucosamine and haloperidol. Their mechanisms of action are entirely different, and co-administration is generally considered safe without adverse interactions.