| Medication | Perioperative complications |
| Prednisone | Addisonian crisis |
| Depression | |
| Adrenal insufficiency | |
| Sulfasalazine | Neutropenia |
| Blood dyscrasias | |
| Hypersensitivity | |
| Azathioprine and 6-mercaptopurine | Leukopenia |
| Thrombocytopenia | |
| Macrocytic anemia | |
| Bone marrow suppression | |
| Hepatotoxicity | |
| Mesalamine | Diarrhea |
| Nausea/vomiting | |
| Headache | |
| Metronidazole | Convulsive disorders |
| Peripheral neuropathy | |
| Cyclosporine | Nephrotoxicity |
| Hepatotoxicity | |
| TNF-alpha inhibitors | Injection site reactions |
| Infusion reactions | |
| Infections | |
| Demyelinating disease | |
| Heart failure | |
| Malignancy | |
| Induction of autoimmunity |
