Which of the following medications is commonly prescribed for anemia?

The medication that is commonly prescribed for anemia is erythropoiesis-stimulating agents, which includes drugs like epoetin alfa (often referred to by trade names similar to Neupogen). These medications are specifically used to stimulate the production of red blood cells in patients with anemia, particularly in cases related to chronic kidney disease or certain chemotherapy treatments.

In contrast, the other medications listed serve different purposes: Phenergan is primarily an antihistamine used to treat allergies, nausea, and motion sickness; Azithromycin is an antibiotic used for treating various bacterial infections; and Warfarin is an anticoagulant used to prevent blood clots. None of these other medications address the underlying issues related to anemia or support red blood cell production. Therefore, the association of Neupogen with anemia treatment is based on its role in stimulating red blood cell production.