The side effects of levofloxacin hydrochloride are mainly as follows: if patients take it with non-steroidal anti-inflammatory analgesic drugs, such as aspirin, ibuprofen, etc., it may cause generalized muscle twitching; if it is used together with oral hypoglycemic drugs, it may cause blood glucose disorders of the patients, including hyperglycemia and hypoglycemia. Some patients may have gastrointestinal reactions, such as nausea, vomiting, diarrhea, dyspepsia, etc. Some patients may also have allergic reactions, such as generalized swelling, urticaria, rash, itching, erythema, maculopapular rash, etc. Some patients may also have neurological reactions. Some patients may also experience neurological reactions, such as muscle tremor, numbness, visual abnormalities, and drowsiness, and some patients also experience headache and dizziness. Long-term use of this drug can also occur in patients with elevated urea nitrogen in the urine or transient hepatic impairment. This type of drug is prohibited for patients younger than 18 years of age because it can affect the growth and development of patients.