Which of the following medications is known to have a narrow therapeutic index?

Rationale

Tacrolimus is known to have a narrow therapeutic index.

Tacrolimus is an immunosuppressant medication that requires careful monitoring of blood levels due to its narrow therapeutic index, meaning that the range between effective and toxic doses is small. This necessitates regular blood tests to ensure patient safety and drug efficacy.

A (Tacrolimus) CORRECT

Tacrolimus is indeed recognized for its narrow therapeutic index, which means that small changes in dosage or blood concentration can lead to significant adverse effects or therapeutic failures. Clinicians must monitor drug levels closely to avoid toxicity, making it critical to manage in clinical settings.

B (Tolterodine) YOUR ANSWER

Tolterodine is an antimuscarinic agent used primarily for overactive bladder. It does not have a narrow therapeutic index; rather, it has a wider safety margin, allowing for more flexible dosing without a high risk of toxicity.

C (Travoprost) YOUR ANSWER

Travoprost is a prostaglandin analog used in the treatment of glaucoma and ocular hypertension. This medication also does not exhibit a narrow therapeutic index; it is generally considered safe with a broader range of effective doses, making it easier to prescribe without stringent monitoring.

D (Tadalafil) YOUR ANSWER

Tadalafil is a phosphodiesterase type 5 inhibitor used to treat erectile dysfunction and pulmonary hypertension. It has a relatively wide therapeutic window, and while it may have side effects, its dosing is not as critical as that of drugs with a narrow therapeutic index.

Conclusion

The concept of a narrow therapeutic index is critical in pharmacology, as it highlights the need for careful dosing and monitoring of certain medications. Tacrolimus exemplifies this category, requiring vigilant oversight to prevent toxicity and ensure therapeutic effectiveness. In contrast, the other medications listed offer greater dosing flexibility and safety margins, underscoring the significance of understanding therapeutic indices in clinical practice.

Which of the following medications is known to have a narrow therapeutic index?

Tacrolimus is known to have a narrow therapeutic index.

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