This is a very good question with direct clinical practice implications. I do not check or follow anti-drug antibodies when using TNF inhibitors for the treatment of rheumatoid arthritis or psoriatic arthritis. There are reports that suggest, on a group level, that these antibodies, if present, impa...

I agree with Dr. @Yusuf Yazici, as we have good clinical measures of disease activity and once response is reduced or lost, other alternative medications to use. Therapeutic drug monitoring is more important in IBD where clinical measures are not as easily obtained. Further, as already discussed, an...