Pregabalin showed no clear difference in hospital admissions compared with placebo (low certainty).
Azathioprine or 6‐mercaptopurine may leads to higher maintenance of remission (sensitivity analysis excluding Candy 1995) compared with placebo (low certainty).
It is very uncertain whether azathioprine changes withdrawals due to adverse events compared with budesonide (very low certainty).
It is very uncertain whether azathioprine changes serious adverse events compared with budesonide (very low certainty).
It is very uncertain whether azathioprine and infliximab changes maintenance of remission compared with infliximab (very low certainty).
It is very uncertain whether azathioprine and infliximab changes adverse events compared with infliximab (very low certainty).
It is very uncertain whether azathioprine and infliximab changes withdrawals due to adverse events compared with infliximab (very low certainty).
It is very uncertain whether azathioprine and infliximab changes serious adverse events compared with infliximab (very low certainty).
It is very uncertain whether 6‐Mercaptopurine changes maintenance of remission compared with methotrexate (very low certainty).
It is very uncertain whether 6‐Mercaptopurine changes adverse events compared with methotrexate (very low certainty).
It is very uncertain whether 6‐Mercaptopurine changes withdrawals due to adverse events compared with methotrexate (very low certainty).
It is very uncertain whether 6‐Mercaptopurine changes serious adverse events compared with methotrexate (very low certainty).
Azathioprine or 6‐mercaptopurine may leads to higher adverse events compared with placebo (low certainty).
It is very uncertain whether azathioprine or 6‐mercaptopurine changes withdrawals due to adverse events compared with placebo (very low certainty).
It is very uncertain whether azathioprine or 6‐mercaptopurine changes serious adverse events compared with placebo (very low certainty).
Azathioprine or 6‐mercaptopurine showed no clear difference in maintenance of remission compared with mesalazine or sulfasalazine (low certainty).
It is very uncertain whether azathioprine or 6‐mercaptopurine changes adverse events compared with mesalazine or sulfasalazine (very low certainty).
It is very uncertain whether azathioprine or 6‐mercaptopurine changes withdrawals due to adverse events compared with mesalazine or sulfasalazine (very low certainty).
It is very uncertain whether azathioprine or 6‐mercaptopurine changes serious adverse events compared with mesalazine or sulfasalazine (very low certainty).
Azathioprine may leads to higher maintenance of remission compared with budesonide (low certainty).