Herbs that have the ability to soothe or reduce pain by lessening the sensitivity of the nervous system and the brain. It is analgesic and is often applied topically.
Merriam-Webster Online Dictionaryanodyne (adjective)
serving to alleviate pain
not likely to offend or arouse tensions - innocuous
something that soothes, calms, or comforts - the anodyne of bridge, a comfortable book, or sport Harrison Smith
a drug that allays pain