RA Initially 3 mg/kg IV infusion over 2 hr followed w/ 3 mg/kg administered 2 & 6 wk after 1st infusion then every 8 wk thereafter. After 22 wk, may be increased up to 5-10 mg/kg every 8 wk if necessary. Should be given in combination w/ methotrexate. Moderate to severe Crohn's disease Induction regimen: 5 mg/kg as single IV infusion over 2 hr at 0, 2 & 6 wk. Maintenance regimen: 5 mg/kg every 8 wk thereafter. Ped Crohn's disease 5 mg/kg as IV infusion followed by additional 5 mg/kg infusion doses at 2 & 6 wk after the 1st infusion then every 8 wk thereafter. In incomplete response, dose may be adjusted up to 10 mg/kg. Ankylosing spondylitis 5 mg/kg IV infusion over 2 hr followed by 5 mg/kg doses administered at 2 & 6 wk after 1st infusion then every 6-8 wk thereafter. Psoriasis, psoriatic arthritis, ulcerative colitis 5 mg/kg IV infusion over 2 hr followed by additional 5 mg/kg infusion at 2 & 6 wk after the 1st infusion then every 8 wk thereafter. Re-administration for Crohn's disease & RAMay be re-administered w/in 16 wk following last infusion if signs & symptoms recur. Fistulizing Crohn's disease 5 mg/kg IV infusion over 2 hr followed w/ 5 mg/kg dose at wk 2 & 6 after 1st infusion. Maintenance: 5 mg/kg every 8 wk if the patient responds after these 3 doses.