Which of the following should be monitored if linezolid is given for more than 14 days?
**Core Concept**
Linezolid is an antibiotic that inhibits protein synthesis by binding to the 50S subunit of the bacterial ribosome. Prolonged use of linezolid can lead to side effects related to its mechanism of action and metabolism.
**Why the Correct Answer is Right**
Linezolid is a monoamine oxidase inhibitor (MAOI) by virtue of its mechanism of action, which involves the inhibition of mitochondrial complex I. This inhibition can lead to the accumulation of catecholamines, resulting in a condition known as serotonin syndrome or a hypertensive crisis. Monitoring for thrombocytopenia is also crucial, as linezolid has been associated with a dose-dependent decrease in platelet count. Regular monitoring of the patient's platelet count and blood pressure is essential to prevent these complications.
**Why Each Wrong Option is Incorrect**
**Option A:** Thrombocytopenia is a known side effect of linezolid, but it is not the only concern with prolonged use.
**Option B:** While linezolid can interact with other medications, it is not the primary concern with prolonged use.
**Option C:** Renal function monitoring is not specifically indicated for linezolid use beyond 14 days.
**Clinical Pearl / High-Yield Fact**
When prescribing linezolid for more than 14 days, it is essential to consider the potential for thrombocytopenia and serotonin syndrome. Regular monitoring of platelet count and blood pressure can prevent these complications.
**Correct Answer: C. Renal function monitoring is not specifically indicated for linezolid use beyond 14 days.**