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'''药物治疗'''指一切用作诊断、治疗、预防疾病或减轻痛楚的药物或[[化学]]物质。[http://www.fda.gov/opacom/laws/fdcact/fdcact1.htm US Federal Food, Drug, and Cosmetic Act, SEC. 210., (g)(1)(B).] Accessed 17 August 2008.[http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32004L0027:EN:HTML Directive 2004/27/EC of the European Parliament and of the Council of 31 March 2004 amending Directive 2001/83/EC on the Community code relating to medicinal products for human use. Article 1.] Published March 31, 2004. Accessed 17 August 2008.。可能是单一的活性成份，或是由多种活性成份组合而成[http://www.pharmacistspharmajournal.org/2010/11/definitions-of-drug-radioactive-drug_11.html Definition and classification of Drug or Pharmaceutical Regulatory aspects of drug approval] Accessed 30 Dec 2013.[http://www.fda.gov/opacom/laws/fdcact/fdcact1.htm US Federal Food, Drug, and Cosmetic Act, SEC. 210., (g)(1)(B).] Accessed 17 August 2008.[http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=CELEX:32004L0027:EN:HTML Directive 2004/27/EC of the European Parliament and of the Council of 31 March 2004 amending Directive 2001/83/EC on the Community code relating to medicinal products for human use. Article 1.] Published March 31, 2004. Accessed 17 August 2008.。物质。。可能是单一的活性成份，或是由多种活性成份组合而成。

药物治疗可以依多种方法分类www.epgonline.org database of prescription pharmaceutical products including drug classifications [http://www.epgonline.org/class.cfm]，其中最常见的是以化学性质、功效、受影响身体部位或者是分类。药物治疗可以依多种方法分类，其中最常见的是以化学性质、功效、受影响身体部位或者是分类。[[世界卫生组织]]（[[WHO]]）在1976年[[推出]]的[[解剖学治疗学及化学分类系统]]（[[ATC]]）受广泛应用，同时该组织还发布了一份[[世界卫生组织基本药物标准清单|基本药物]]列表。