Side effects from levofloxacin usually resolve in 2 to 3 days after stopping the drug. Levofloxacin, one of the quinolones, has a broad-spectrum antibacterial effect. The antibacterial effect is strong, but there are also some side effects, such as abdominal discomfort, painful diarrhea, nausea and vomiting. Adverse reactions can also occur in the central nervous system, which is characterized by dizziness, headache, insomnia or drowsiness. Levofloxacin may also appear after taking allergic reactions, the skin surface will appear varying degrees of rash, oozing erythema, local itching and angioneurotic edema, etc., photoallergic reaction although there is, but this situation is rare. A very small number of patients after taking the serum aminotransferase elevation, blood urea nitrogen and so on, basically will not be persistent, and will occasionally occur once. Also Levofloxacin should not be used for a long period of time or in high doses, and needs to be used in the amounts prescribed by the doctor. If the side effects persist, you need to stop taking it immediately.