My Mom Has Rheumatoid And Osteo Arthritis. She Has Been

My mom has rheumatoid and osteo arthritis. She has been taking Cymbalta 60mg for about three years now. (My dad was battling a terminal illness, and my mom was VERY, VERY stressed going through the process of his illness, and her doctor recommended Cymbalta.) She is in a lot of pain from the arthritis, and we suggested she take CBD oil. My mom wanted to be weaned off the Cymbalta, but we just found out about the side effects of doing so, and we are concerned. My question is: Can CBD oil and Cymbalta be taken together??