Which of the following medications is typically stored in the refrigerator?

Insulin is typically stored in the refrigerator to maintain its efficacy and prolong its shelf life. Insulin is a sensitive medication that can be adversely affected by extreme temperatures. Storing it in the refrigerator helps to preserve its potency, ensuring that patients receive the correct dosage for their conditions.

In contrast, ibuprofen and aspirin can be stored at room temperature and do not require refrigeration. As for amoxicillin, while some forms may need refrigeration once reconstituted, the standard capsules or tablets are stable at room temperature. Hence, insulin stands out as the medication that specifically requires refrigeration for optimal storage.