Although we are uncertain about the efficacy of ustekinumab for induction of remission, moderate quality evidence suggests that ustekinumab may be effective for induction of clinical improvement in patients with moderate to severe CD. Due to small numbers of patients in dose subgroups the optimal dosage of ustekinumab is unclear. Briakinumab and ustekinumab appear to be safe. Due to sparse data we were unable to determine the risk of serious adverse events. Further studies are required to determine the efficacy and safety of ustekinumab in patients with moderate to severe CD. The results of three phase III trials that are currently underway will provide important new information.