Ornidazole, a nitroimidazole commonly used to treat toothache, does have some gastrointestinal reactions, but it is already the nitroimidazole with the fewest side effects compared to traditional nitroimidazoles. If you are afraid of a gastrointestinal reaction, consider taking Ornidazole with a meal. The commonly used nitroimidazoles are metronidazole, tinidazole, and ornidazole. Compared to metronidazole ornidazole, the gastrointestinal reaction is significantly reduced, and its effect is also the best. ornidazole can be applied together with cephalosporin for anti-inflammatory treatment, and the effect will be better. All anti-inflammatory drugs, in order to reduce the gastrointestinal reaction, can be considered to take after meals, will reduce the anti-inflammatory drugs on the gastrointestinal tract stimulation.