Fluparic acid generally refers to haloperidol, or norfloxacin, and is recommended to be taken orally with meals. Norfloxacin belongs to a kind of quinolone antibacterial drug, which has strong bactericidal effect on Escherichia coli, Proteus mirabilis, Salmonella, Serratia, gonococcus and so on. Patients take the drug orally after meals can reduce the stimulation of the drug on the gastrointestinal mucosa, so it is generally recommended to take the drug orally after meals. Gastrointestinal reactions are more common among the adverse reactions of norfloxacin, which can be manifested as abdominal discomfort or pain, diarrhea, nausea or vomiting; central nervous system reactions can be dizziness, headache, somnolence or insomnia; allergic reactions include rash, itchy skin and so on, and occasionally oozing erythema multiforme and angioneurotic edema can occur. A few patients have photosensitive reaction. Patients are advised to use this drug correctly under the guidance of a doctor, not blindly, so as not to cause adverse reactions.