My Husband Is Seriously Subject To Side Effects. One That

My husband is seriously subject to side effects. one that I had a hard time convincing doctors of is that his is sensitive to the red dye in medications. It causes joint swelling similar to arthritis and extreme pain. They finally figured out he could not take generic tegretol for this reason. He is now retired from the military and it takes forever for the VA to do things. The medications he takes now are due to a heart condition and the ones that I feel could have the same type of dye are crestor, plavix, tradjenta and B12 that the doctor reccommended. Am I looking too hard or is this a possibility?