Katrine,
I can shed a little personal experience here. I have been on entocort and pentasa for about a year. kept me from dying but did not get me to remission. I can no longer take biologics due to some major issues I had with Remicade. I am now on: Pentasa, Entocort, LDN, and CBD Tinctures as well as wax that I vaporize. The LDN helps a bit, then I added the wax which helped but seemed to just cover up symptoms temporarily. I added in the tinctures and sure enough. Things got much much better. So much better that I feel like I finally found the combination to completely control my Crohn's. I would not worry about the CBD interfering or counteracting your entocort. I recommend you try it and I hope everything works out!
Best,
James