© Healthline Media UK Ltd, Brighton, Diabextan Philippines UK, a Red Ventures Company. Any medical information published on this website is not intended as a substitute for informed medical advice and you should not take any action before consulting with a healthcare professional. Studies indicate that CBD is useful for a variety of ailments, and oil is one of several ways people can consume it. Although studies report few side effects with CBD use, its effectiveness for various medical conditions requires further research. In some countries, doctors can prescribe Sativex, a drug that contains THC and CBD, to relieve spasticity in people with MS. Scientists are not sure how it works.