CBD +/- THC can be very useful in certain conditions. There are now many published studies on this topic. Recently I read an article in the HerbalGram of the American Botanical Council describing its benefits
Cannabis (Cannabis sativa, Cannabaceae) has been validated in clinical trials for chronic pain in adults. Its > 100 phytocannabinoids (pCBs) interact with the endocannabinoid system (ECS), affecting pain, stress, mood, and sleep.
The authors concluded in the Brazilian Health Centers that THC with CBD was very effective in fibromyalgia patients. I would encourage patients to seek this low cost treatment instead of other drugs Full article below
Chaves C, Bittencourt PCT, Pelegrini A. Ingestion of a THC-rich cannabis oil in people with fibromyalgia: a randomized, double-blind, placebo-controlled clinical trial. Pain Med. October 1, 2020;21(10):2212-2218. doi: 10.1093/pm/pnaa303.