Introduction: bronchial asthma is a chronic respiratory disease, where Natural and Traditional Medicine is an option as an alternative therapy. Objective: to evaluate the effectiveness of an educational intervention on the level of knowledge of Natural and Traditional Medicine as a therapeutic in asthma. Method: a non-observational, quasi-experimental study was carried out, before-after without a control group, in patients from doctor´s office No. 5 of the “Jose Marti Perez” Teaching Polyclinic from January-June 2019. The universe consisted of 177. Results: the main source of information was that from health professionals (45,2 %). After applying the intervention, knowledge about bronchial asthma, Natural and Traditional Medicine (89,83 %), triggers (83,61 %) and knowledge about treatment (8,47 %) were adequate. Similarly, after the intervention, knowledge about the use of Natural and Traditional Medicine in asthma (96,04 %) and the evaluation of general knowledge (92,09 %) were adequate. Conclusions: there was an insufficient level of knowledge in asthmatic patients about the use of Natural and Traditional Medicine for their treatment. Health personnel must establish themselves as the main source of knowledge about the application of Natural and Traditional Medicine in the community. The use of educational interventions is useful and effective to raise the level of knowledge about the use of Natural and Traditional Medicine in the treatment of bronchial asthma