Final answer:
A patient on sulfasalazine for an inflammatory bowel disease should be supplemented with vitamin B12.
Step-by-step explanation:
A patient on sulfasalazine for an inflammatory bowel disease should be supplemented with vitamin B12.
Patients with inflammatory bowel disease such as Crohn's disease may develop poor absorption of vitamin B12, leading to pernicious anemia. Sulfasalazine, a commonly used medication for inflammatory bowel disease, can further deplete vitamin B12 levels. Therefore, it is recommended to supplement patients on sulfasalazine with vitamin B12 to prevent deficiency.