Over 144 cannabinoids have been isolated within the cannabis plant but the main cannabinoids that are clinically used today are: Delta 9-tetrahydrocannabinol (THC) and Cannabidiol (CBD). CBD and THC have almost identical chemical makeup. Both cannabinoids have analgesic and anti-inflammatory properties. THC can have psychoactive  effects like euphoria.
CBD is non-intoxicating, is non-addictive and less potent than THC with very low toxicity.
Cannabis formulations have different ratios of THC to CBD. Each formulation:
Provides different therapeutic effects.Interacts differently with each person’s endocannabinoid system and biochemistry.Can have a different side effect profile in patients.