Source:http://linkedlifedata.com/resource/umls/id/C0683140
GO: The chemical reactions and pathways involving a drug, a substance used in the diagnosis, treatment or prevention of a disease; as used here antibiotic substances (see antibiotic metabolism) are considered to be drugs, even if not used in medical or veterinary practice. [GOC:cab2],CSP: the buildup and breakdown of drugs for utilization by the organism.,NCI: A series of chemical modifications of a drug compound by enzymatic activity that make the substrate (drug) more water soluble to allow its clearance from the body. Drug metabolism occurs in two phases: Phase I (biotransformation) involves oxidation, hydroxylation reduction, and hydrolysis. Phase II (conjugation) involves synthesis and conjugation.