How many Levofloxacin tablets a day need to be taken under the guidance of a doctor according to the severity of the disease, the common dosage is 250 mg or 500 mg or 750 mg orally every 24 hours, the exact number of tablets need to refer to the specifications of the drug as well. Levofloxacin tablets of 0.5 g/tablet are usually taken as one tablet once a day for adults. The exact dosage can be adjusted up or down depending on the type of pathogen. For example, for hospital-acquired pneumonia, the dosage can be increased to 750 milligrams per dose, once a day. Levofloxacin tablets are mainly indicated for mild and moderate infections caused by sensitive bacteria, including infections of the respiratory tract, urinary tract, reproductive system, skin, soft tissues, intestines and other parts of the body. Its adverse reactions mainly include digestive system side effects such as nausea, vomiting, loss of appetite; at the same time, allergic symptoms such as rash, itching and erythema may occur; occasional neurological side effects such as tremor, numbness, tinnitus and hallucinations; occasional increase in blood urea nitrogen; there may be a transient abnormalities of hepatic function; and some patients may develop anemia and leukopenia, and other adverse reactions. Allergic to quinolones, pregnant and lactating women, patients under 18 years of age are prohibited. Avoid sunlight during the use of the drug. It is recommended to use the drug correctly under the guidance of a professional doctor.