The role and efficacy of Ornidazole are mainly the following two points: 1, treatment of protozoal infections, Trichuris infection, amoebic protozoal infections (intestinal and hepatic amebiasis, amoebic dysentery, amoebic abscess). 2, treatment of anaerobic bacterial infections, such as septic meningitis, peritonitis, post-operative wound infection, postpartum sepsis, septic abortion, endometritis and other infections caused by sensitive bacteria, prevention of various surgical Post-operative anaerobic bacterial infections. The main usage and dosage are: in the treatment of anaerobic infections, 500mg/d twice daily for adults; 10mg/kg for 12 hours for children. in the treatment of amebiasis, 500mg twice daily for adults and 25mg/kg/d for children. in the treatment of trichomoniasis, 1-1.5g once daily for adults and 25mg/kg/d for children.