Duration of treatment and oral administration of antibiotics in community acquired pneumoniaCommunity acquired pneumonia (CAP) is an important cause of morbidity and mortality around the world, with high treatment costs due to hospitalization and complications (adverse events due to medications, antibiotic resistance, healthcare associated infections, etc.).It has been proposed administration of short courses and early switch of intravenous administration to oral therapy to avoid costs and complications.There are recommendations about these topics in national and international guidelines, based on clinical trials which do not demonstrate differences in mortality and complications when there is an early change from intravenous administration to the oral route.There are no statistically significant differences in safety and resolution of the disease when short and long treatment schemes were compared.In this review we present the most important guidelines and clinical studies, taking into account the pharmacological differences between different medications.It is considered that early switch from intravenous to oral administration route and use of short cycles in CAP is safe and brings benefits to patients and institutions.