My Husband Has Parkinson's Disease And Is On Azilect And

My husband has Parkinson's disease and is on Azilect and a pain doctor put him on Fentanyl 25mcg for pain from spinal stenosis. He had a heart attack Dec. 27, 2016 and is now in rehab and the doctor there has raised concern about the interaction between these two drugs. I don't want my husband in pain so he will stop the Azilect and continue the Fentanyl. I need help.