A nurse is assisting with the care of a client who has methicillin-resistant Staphylococcus aureus and is receiving linezolid IV. For which of the following adverse effects should the nurse monitor?

This clinical scenario involves monitoring a patient receiving linezolid for an infection. The nurse must apply knowledge of oxazolidinone antibiotic pharmacology and adverse effect profiles to identify specific physiological complications associated with this therapy. Choice A rationale Linezolid disrupts normal intestinal flora, which can lead to antibiotic-associated diarrhea or Clostridioides difficile overgrowth. Gastrointestinal disturbances are a well-documented adverse effect requiring close monitoring during therapy. Choice B rationale Sedation is not a recognized adverse effect of linezolid therapy. Linezolid functions as a reversible monoamine oxidase inhibitor, meaning it can cause central nervous system excitation or serotonin syndrome, rather than sedation. Choice C rationale Dry mouth is not a characteristic adverse effect linked to linezolid use. This manifestation is typically associated with anticholinergic agents rather than oxazolidinone antibiotics, which primarily impact protein synthesis and bacterial ribosome assembly. Choice D rationale Polyuria is not caused by linezolid administration. Linezolid is not nephrotoxic in a manner that induces diabetes insipidus or osmotic diuresis, so excessive urination is not an anticipated adverse outcome.