Which of the following is an IV medication that has a narrow therapeutic index and requires close monitoring?

Rationale

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

Vancomycin is an antibiotic used to treat severe infections caused by Gram-positive bacteria. It has a narrow therapeutic index, meaning there is a small margin between effective and toxic doses, necessitating careful monitoring of drug levels in the bloodstream to avoid adverse effects.

A (Varenicline) YOUR ANSWER

Varenicline is a medication used to help people quit smoking by reducing cravings and withdrawal symptoms. It is not classified as an intravenous medication and does not have a narrow therapeutic index, making it unsuitable for this question.

B (Venlafaxine) YOUR ANSWER

Venlafaxine is an antidepressant belonging to the serotonin-norepinephrine reuptake inhibitor (SNRI) class. While it does require monitoring for side effects, it is typically administered orally rather than intravenously, and its therapeutic index is not considered narrow compared to vancomycin.

C (Valacyclovir) YOUR ANSWER

Valacyclovir is an antiviral medication used to treat infections caused by certain viruses, such as herpes. It is primarily administered orally and does not have a narrow therapeutic index, which distinguishes it from the closely monitored nature of vancomycin therapy.

D (Vancomycin) CORRECT

Vancomycin is an antibiotic that is typically administered intravenously for serious infections, particularly those caused by methicillin-resistant Staphylococcus aureus (MRSA). Its narrow therapeutic index necessitates regular monitoring of serum drug levels to prevent toxicity and ensure therapeutic efficacy.

Conclusion

In summary, vancomycin stands out as the only intravenous medication among the choices that possesses a narrow therapeutic index and requires close monitoring. This characteristic is critical in managing potential toxic effects while ensuring effective treatment of severe bacterial infections. Other listed medications either lack the intravenous route, do not have a narrow therapeutic index, or are used for different therapeutic purposes.

Which of the following is an IV medication that has a narrow therapeutic index and requires close monitoring?

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

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