General information about the qualitative and quantitative composition of medicines. Scheme of sistematic identification of organic products. Qualitative Elemental Analysis (Lassaigne). General assays: combustion; Beilstein, FeCl3, thermal decomposition by KOH, Le Rosen and Friedl-Craft, oxidation reactions, CHCI3 reaction. Solubility. Melting point, boiling point, refractive index and specific rotation. Functional group reactions. Identification of medicines recorded in the European Pharmacopeia 7th Edition.