Soma (carisoprodol) is a relaxer of the muscle and helps alleviate pain. It blocks pain sensations between the nerve and the brain. The drug should only be used as prescribed as it can be habit-forming. Soma is not good for those who have a history of drug addiction or abuse. Since Soma is the drug that produces the most drowsiness and has the most potential to be abused, it is an FDA-scheduled drug.