The use of medicinal plants for curative purposes is a practice that has been used since time immemorial, medicinal plants were the main and even the only resource available to physicians. To determine the effectiveness of a community intervention on the knowledge and use of phytotherapy. A quasi-experimental study was carried out with the population of a medical office belonging to the polyclinic of Manacas, Santo Domingo municipality in the period from September 2021 to June 2023. A predominance of low and medium level of knowledge about phytotherapy was observed, being more frequent the patients with medium superior level (53.75%). The (97%) referred knowledge acquired by family tradition, the plants most used by patients were Garlic and Caña Santa, likewise the empirical form predominated as motivation for patients in the use of phytotherapy (57.50%), after the measures implemented, the cultivation of medicinal plants in the homes and the level of knowledge about green medicine increased considerably, achieving satisfaction on the part of the patients who participated in the study.