I have been taking Humira injections and Prednisone for psoriatic arthritis for a few months. I just found out I have an infected root canal and I started on penicillin ... So I was told to discontinue my Humira until I'm done with penicillin.. I am due for a shot in a couple of days.. So in addition to my root canal procedure tomorrow (yikes) I am worried about a flare-up... Any one ever have to stop taking Humira and not flare-up?