Question 12

Toprol XL 50 mg substituted with metoprolol tartrate 50 mg is a wrong drug error.

Substituting Toprol XL, an extended-release formulation, with metoprolol tartrate, an immediate-release formulation, constitutes a wrong drug error. This substitution can lead to significant differences in drug absorption and efficacy, potentially compromising patient safety.

A) wrong drug error

This option is correct because Toprol XL and metoprolol tartrate, while both containing the same active ingredient, differ fundamentally in their release mechanisms. Toprol XL is designed for once-daily dosing due to its extended-release properties, whereas metoprolol tartrate typically requires multiple doses throughout the day. The incorrect substitution could lead to therapeutic failure or adverse effects.

B) administration error

This option is incorrect because an administration error refers to mistakes made during the actual delivery of a medication, such as giving the wrong dose at the wrong time. The issue in question pertains specifically to the substitution of one medication for another, rather than an error in how the drug is administered.

C) incorrect time error

This option is also incorrect as it refers to the timing of medication administration. The problem here is not about when the medications are given, but rather that the wrong formulation of the drug was used, which could affect the overall treatment plan.

D) not an error

This option is incorrect since the substitution of Toprol XL with metoprolol tartrate constitutes a significant error in medication management. Given the differences in drug release and dosing schedules, this substitution could lead to serious health implications for the patient.

Conclusion

The substitution of Toprol XL with metoprolol tartrate is a clear example of a wrong drug error due to the differences in their pharmacokinetic profiles. All other options fail to accurately describe the nature of the error, which specifically involves the incorrect interchange of two different formulations of the same medication. Proper medication management is crucial for ensuring patient safety and therapeutic effectiveness.