Which of the following drugs should not be refrigerated?

Nadolol (Corgard) is a beta-blocker used to treat hypertension and chest pain. It is stored tightly closed at room temperature between 59 to 86 ºF (15 and 30 ºC) away from heat, moisture, and light. Humulin N is a form of insulin. After being opened, it is stored in the refrigerator or at room temperature below 86 ºF. Humulin N must be discarded 31 days after opening. Ampicillin is a penicillin antibiotic. The liquid suspension form should be stored in the refrigerator for up to 7 days. Epoetin alfa IV is used for patients undergoing chemotherapy or with anemia from serious chronic diseases. It is stored in the refrigerator and should be protected from light.