Many people develop allergies when applying antibiotics, and there are many people who are allergic to Ornidazole. For allergic symptoms when applying Ornidazole, the milder ones will be localized skin itching, rash, redness, etc. If mild symptoms occur, the drug can be temporarily discontinued and will gradually ease 1-2 hours after discontinuation. However, if serious allergic symptoms occur, such as difficulty in breathing, tightness in the throat, or severe allergic conditions such as large erythema and skin peeling all over the body, it is recommended to go to the hospital for timely treatment. If necessary, intravenous anti-allergic drugs and hormonal drugs should be applied for treatment. Allergies to drugs must be prevented and the next application of the drug must be avoided in the case of a clear previous history of allergy.