Norfloxacin, also known as floxacin, is commonly used to treat intestinal infections. Especially in the summer and autumn, due to the rapid reproduction of bacteria, food is easy to deteriorate, and many people cause bacterial infectious diarrhea due to unclean diet. Norfloxacin is often a staple at home or on trips. Norfloxacin has high antibacterial activity against gram-negative bacteria such as Escherichia coli, dysenteriella, Salmonella, Proteus, Pseudomonas aeruginosa and other Chemicalbook bacteria. It also has good antibacterial activity against gram-positive bacteria such as Staphylococcus and Diplococcus pneumoniae. The main action site is the DNA spinase of bacteria, which causes the spiral cracking of bacterial DNA, rapidly inhibits the growth and reproduction of bacteria, kills bacteria, and has a strong penetration effect on the cell wall, so its bactericidal effect is stronger and the stimulation of gastric mucosa is small.