The course gives the student an adequate understanding of the interaction between the drug and the body that determine the therapeutic effects. It discusses the fundamentals of the pharmacological (drug-receptor interaction and mechanism of action, absorption, biotransformation and elimination; idiosyncratic reactions) of drugs, divided into therapeutic classes, we explore the following aspects: a) the main molecular mechanisms responsible for their action, b) evaluating the efficacy and safety in the therapeutic field and the ability to prevent certain diseases or alleviate symptoms, c) adverse effects and side effects that may limit the use d) interactions.