An antimicrobial peptide, named Bicarinalin [1], isolated from the venom of the ant Tetramorium bicarinatum showed remarkably strong activity against an ATCC strain and forty-four Peruvian patient strains of Helicobacter pylori isolated from stomach ulcer biopsies. Bicarinalin had a potent antibacterial activity (IC50= 0.98µM at the same magnitude as for four antibiotics: amoxicillin IC50 7), suggesting potential for development into an anti-infective agent for use against the causal agent of stomach ulcers. Bicarinalin is a promising lead compound in the search for more effective and specific H. pylori therapeutics.