In this course formula, nomenclature, general physicochemical properties, general synthetic pathways, metabolism, stability, general chemical analysis, structure-activity relationships of pharmaceutical active ingredients used in diagnosis and treatment of some diseases are given. Within this general topic introduction to medicinal chemistry, metabolism, structure-activity relationships, transport systems, chemical bonding, narcotic analgesics, non steroidal antiinflammatory drugs, sedative and hypnotic drugs, tranquilizing drugs, neuroleptics, anticancer drugs, general anesthetics, local anesthetics, antidepressants, myorelaxant drugs, anticonvulsants, antiepileptics, antihistamines are taught.