After taking antibiotics, there is flocculation in the urine, which is mainly considered to be related to urinary system infection, prostatitis and urinary tract stones and other factors. 1. Urinary system infections: such as urethritis, cystitis, pyelonephritis and other diseases, can lead to the presence of bacterial metabolites and inflammatory secretions in the urine, and then the phenomenon of flocculent urine. After the application of antibiotics, the dosage is insufficient or not directed at the causative organisms, this symptom can also occur. 2. Prostatitis: It can also lead to the presence of inflammatory secretions and metabolites of pathogenic bacteria in the urine, and lead to the symptom of flocculent in the urine. If the medication is not appropriate, this symptom will persist. 3. Urinary stones: some fine stones mixed with urine, also can appear the above symptoms. In this case, the application of antibiotics does not have a therapeutic effect. The above symptoms should be taken seriously by the patients, and they should consult the doctor as soon as possible to confirm the diagnosis and give targeted treatment.