The CBD to THC ratio is an important factor when choosing a cannabis strain or product. However it is not the only parameter, as other components of the plant will also contribute to the unique effects. Depending on the patient and their lifestyle, many different strains of cannabis and products would be appropriate. Many patients start by trying a high CBD ratio (30:1 or 20:1) and adjust the ratio depending on the effects. Each individual patient is unique and the best method is to experiement and "be your own doctor", and decide what works best through the process of trial and error.