Adverse events (AEs)
| Rituximab (n=16) | Placebo (n=8) | |
| Number of patients with any AE | 15 | 8 |
| Worsening of ulcerative colitis | 10 | 7 |
| Headache | 2 | 2 |
| Dizziness | 2 | 1 |
| Vasovagal syncope during infusion | 1 | 0 |
| Arthralgia | 1 | 2 |
| Iritis/conjunctivitis | 0 | 2 |
| Nausea/vomiting | 1 | 1 |
| Acne | 0 | 1 |
| Chest infection | 0 | 1 |
| Lethargy | 1 | 1 |
| Back pain | 1 | 1 |
| Tight throat during infusion | 2 | 0 |
| Clostridium difficile | 1 | 0 |
| Pulmonary embolism | 1 | 0 |