Difficulty: Hard

Average Score: 33%

Which of the following products should remain stable until the manufacturer's printed expiration date?

Rationale

An unreconstituted bottle of clarithromycin stored at room temperature should remain stable until the manufacturer’s printed expiration date.

Clarithromycin in its unreconstituted form is stable at room temperature and can maintain its efficacy until the expiration date indicated by the manufacturer, provided it is stored correctly and not exposed to excess moisture or heat.

A (An unreconstituted bottle of clarithromycin stored at room temperature) CORRECT

This option is correct because unreconstituted clarithromycin is stable at room temperature, allowing it to retain its potency until the expiration date specified by the manufacturer. Proper storage conditions are essential for ensuring the medication's effectiveness.

B (A vial of Humalog stored in the freezer) YOUR ANSWER

Humalog, an insulin product, should never be frozen, as freezing can cause it to lose potency and efficacy. Insulin is sensitive to temperature variations, and its stability is compromised when exposed to freezing conditions, making this option incorrect.

C (A vial of Varivax stored under refrigeration) YOUR ANSWER

While Varivax (the varicella vaccine) must be stored under refrigeration, it is typically stable only until its expiration date when properly handled. However, since it requires specific storage conditions and has a limited shelf life, it cannot be considered stable indefinitely, making this option incorrect.

D (An open bottle of doxazosin that has been exposed to moisture) YOUR ANSWER

Doxazosin is sensitive to moisture, and exposure can lead to degradation and reduced effectiveness. Once opened, the stability of doxazosin is compromised further if it has been exposed to moisture, rendering this option incorrect.

Conclusion

Stability of pharmaceuticals is crucial for their effectiveness, and the correct choice, an unreconstituted bottle of clarithromycin, is designed to remain stable until the printed expiration date under proper storage conditions. In contrast, the other options involve improper storage or conditions that lead to instability, highlighting the importance of following manufacturer guidelines for medication storage.

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