Go low and slow. Start with 5 to 10mg of CBD in sublingual form twice a day. If relief is inadequate after one week, increase the dose by that same amount. If needed, go up in small increments over several weeks. If you find relief, continue taking that dose twice daily to maintain a stable level of CBD in the blood. If CBD alone doesn’t work and you are in a state where medical or recreational marijuana is legal, talk to your doctor about taking CBD with a very low-dose THC product. Be aware that THC, even at low levels, may get you high, creating cognitive, motor and balance issues. Try THC-containing products at home or at night first, so you can sleep off any unwanted effects. After several weeks, if you don’t find relief with CBD alone or with a combination of CBD and very low THC, CBD may not be right for you. If you experience any unwanted side effects when using a CBD product, immediately discontinue use and inform your doctor. 

Source: Arthritis Foundation CBD Guide