Side effects of Cloxacin include gastrointestinal symptoms, neurological symptoms, allergic symptoms, and abnormal blood system indicators. 1. Gastrointestinal symptoms: diarrhea, nausea, vomiting, abdominal pain are relatively common, and individual patients may also experience temporary liver discomfort and cholestatic jaundice. 2. Neurological symptoms: relatively rare, mainly nervousness, excitement, insomnia, mental abnormality, increased muscle tone, dizziness and drowsiness can also occur. 3. Allergic symptoms: itchy skin, flushing, maculopapular rash, some patients may have high fever, chills and so on. The drug should be stopped in time if there is accelerated heart rate and so on. 4. Abnormal blood system indexes: occasional thrombocytopenia, rare hemolytic anemia, temporary leukopenia/lymphocytosis, and so on. 5. Others: reversible interstitial nephritis, vaginitis, genital itching, Stephens-Johnson syndrome, etc. Contraindicated in patients with a history of hypersensitivity to cephalosporin antibiotics or bromhexine. It should be used with caution in pregnant women and is contraindicated in lactating women. When side effect symptoms occur, the drug should be stopped immediately, seek medical attention in time, and make drug adjustments and consultations under the guidance of a physician.