The choice of drugs for treatment of fluid in the uterine cavity should be based on the nature of the fluid, which is mainly categorized into physiological fluid and pathological fluid. If it is physiological fluid, observation is enough, no need to use drugs; if it is pathological fluid, you can take oral ceftriaxone, metronidazole and other drugs to treat. 1. Physiological effusion: there will be a small amount of uterine fluid in the uterine cavity during or after ovulation, if there is no abdominal pain, fever and other uncomfortable symptoms, generally do not need special treatment, and can be rechecked in the next menstrual period within 3-5 days of the gynecological ultrasound, and usually disappears on its own. 2. Pathological fluid: when suffering from pelvic inflammatory disease, mostly manifested as abdominal pain, increased vaginal discharge, fever and other symptoms, gynecological ultrasound often suggests the presence of uterine fluid, oral antibiotics, such as ceftriaxone sodium, metronidazole and so on. All of the above drugs should be used under the guidance of a doctor, avoid self-medication.