Question 52

Vancomycin is an IV medication that has a narrow therapeutic index and requires close monitoring.

Vancomycin is known for its narrow therapeutic index, which necessitates careful monitoring of drug levels to avoid toxicity and ensure efficacy. This characteristic makes it essential for healthcare providers to closely oversee its administration and patient response.

A) Varenicline

Varenicline is primarily used as a smoking cessation aid and does not have a narrow therapeutic index. Its monitoring requirements are less stringent compared to medications like vancomycin, which is why it is not the correct answer.

B) Venlafaxine

Venlafaxine is an antidepressant that can have side effects requiring monitoring, but it does not possess a narrow therapeutic index. Its therapeutic range is broader than that of vancomycin, making it an inappropriate choice for this question.

C) Valacyclovir

Valacyclovir is an antiviral medication used for various viral infections and does not have a narrow therapeutic index. Monitoring is not as critical as with vancomycin, thus it does not fit the criteria outlined in the question.

D) Vancomycin

Vancomycin is an intravenous antibiotic with a narrow therapeutic index, meaning that the difference between effective and toxic doses is small. This necessitates close monitoring of drug levels in patients to prevent adverse effects and ensure therapeutic effectiveness.

Conclusion

Vancomycin is the only medication listed that has a narrow therapeutic index and requires close monitoring, distinguishing it from the other options provided. The other medications—varenicline, venlafaxine, and valacyclovir—either do not have the same level of monitoring requirements or do not fall within the definition of having a narrow therapeutic index. Thus, vancomycin is definitively the correct answer.