I have used exclusive enteral nutrition (liquid diet) right now Peptamen 1.5, I have used Nutren 1.5/2.0 also. Exclusive EN got me into remission but for me some inflammation came back after I started eating again.
Currently I also use VSL#3, a very strong probiotic undergoing clinical trials, and Primadophilus reuteri, another probiotic.
Xifaxan, a non-absorbed antibiotic, shows promise and is in clinical trials right now. You might consider that drug, it is expensive but works well for some. That needs to be used in combination with a probiotic like VSL#3.
Other possibilities are Cimzia, Humira (both are similar to remicade in terms of mechanism), Tysabri, or the anti-MAP antibiotic cocktail.
Also possible is diet modification--SCD, Maker's, or just eliminating carbs/dairy/etc.
Could he possibly be considered for a clinical trial, epecially Prochymal (stem cells) if it is still recruiting?
July 2007 Drug-Induced Liver Injury
January 2008 Crohn's Ileitis
Entocort, Enteral Nutrition, Omega-3 (Flax Oil and Fish Oil), VSL#3, Vitamin E