amoxicillin + metronidazole + tetracycline

This is a combination of three antibiotics—amoxicillin, metronidazole, and tetracycline—used primarily in the treatment of *Helicobacter pylori* (H. pylori) infection and associated peptic ulcer disease. Amoxicillin is a beta-lactam antibiotic that inhibits bacterial cell wall synthesis, leading to cell lysis and death. Metronidazole is a nitroimidazole antibiotic effective against anaerobic bacteria and certain protozoa; it disrupts DNA synthesis in susceptible organisms. Tetracycline is a broad-spectrum bacteriostatic antibiotic that inhibits protein synthesis by binding to the 30S ribosomal subunit of bacteria. While these agents are often used as part of multi-drug regimens (typically with bismuth compounds and proton pump inhibitors), the specific triple combination of amoxicillin + metronidazole + tetracycline without additional agents is not standard but may be considered in certain clinical scenarios where resistance patterns or patient allergies dictate alternative regimens[4][5][8]. The rationale for combining these drugs lies in their complementary mechanisms and low rates of resistance for amoxicillin and tetracycline[4]. However, some studies suggest possible antagonism between bactericidal (amoxicillin) and bacteriostatic (tetracycline) actions when used together[4].

Other names

Amoxicillin, metronidazole and tetracyclin