The use of natural products in conventional therapeutics has been gaining highlight in recent years relative to the antimicrobial activity due to the high rate of toxic effects and the excessive growth of the number of multiresistant strains to he conventional antimicrobials used in practice. Among the new therapeutic screenings for bacterial diseases, infections caused by Helicobacter pylori deserve special attention, since they are directly related to severe clinical conditions, such as chronic gastritis, peptic ulcer and gastric cancer. Casearia sylvestris Swartz is a plant popularly known as guaçatonga or erva-de-bugre, used in popular medicine to the treatment of gastric disorders that in recent years has gained the interest of the scientific community due to its important properties with therapeutic potential as an anti-inflammatory, antiofidic, healing, cytotoxicity against tumor cells and mainly antiulcerogenic. In this context, an excellent alternative for the improvement of the bioavailability parameters of the vegetal extracts that is used today is the incorporation of these in nanotechnological systems of drug release so that the active product has a better action. Thus, the aim of this study was to evaluate the in vitro antibacterial potential of the ethanolic extract, aqueous extract, fraction and subfractions of the leaves of Casearia sylvestris Swartz, and incorporate into a drug delivery system the most active derivatives and from these results carry out the in vivo experiment against the H. pylori ATCC strain. The extracts were prepared by infusion and maceration. For the biological analyzes we use the microdilution technique to determine the minimum inhibitory concentration and the formed biofilm. The study was developed applying in vitro and in vivo methodologies to elucidate the antibacterial profile. From the results, we can conclude that the C. sylvestris derivatives showed statistically antibacterial activities both in vitro and in vivo. Most of the vegetal derivatives with the exception of aqueous extracts, fractions 1 and 3 and subfraction 17, had some activity against to the microorganism. This activity is probably related to clerodan diterpenes that are abundant in C. sylvestris derivatives. The incorporation into the nanostructured system did not potentiate the activity of the vegetable derivatives as expected in most tests, this is perhaps due to the fact that the composition of the plant derivatives and the system are not chemically compatible. Since the literature shows an antiulcerogenic activity of C. sylvestris derivatives, they could be used both for wound healing and for H. pylori eradication.