The 7-year-old male patient was given 0.2 g of cefaclor granules tid for bronchitis.He developed blurred vision 3 hours after oral administration.He was discontinued in time.No serious adverse consequences occurred after symptomatic treatment,and the prognosis is good.This case of adverse reaction is clinically rare.It is recommended that when using cefaclor granules and other antibacterial drugs,patients should pay attention to whether they have symptoms related to vision changes,color weakness,and other discomforts and promptly report the discomfort symptoms to the clinic.