Source:http://linkedlifedata.com/resource/umls/id/C0003139
CSP: antagonist is any agent which blocks, inhibits, or attenuates the pharmacological action of another agent; can be indexed with other agent or receptor terms to cover specific antagonist types when a specific precoordinated term is not available.,MSH: Used with chemicals, drugs, and endogenous substances to indicate substances or agents which counteract their biological effects by any mechanism.