Source:http://linkedlifedata.com/resource/umls/id/C0007681
MSH: A very loosely defined group of drugs that tend to reduce the activity of the central nervous system. The major groups included here are ethyl alcohol, anesthetics, hypnotics and sedatives, narcotics, and tranquilizing agents (antipsychotics and antianxiety agents).,CSP: loosely defined group of drugs that tend to reduce the activity of the central nervous system.