The uterine cavity can be emptied in about 24 to 48 hours after the injection of uterotonics. If you find any residue in the uterine cavity, you can have an injection of IUD to induce uterine contractions, which will increase the likelihood of evacuating the residue. Most women have significant lower abdominal pain after the injection and the uterine cavity can be emptied within 24 to 48 hours. However, there are still some women who can’t cause effective uterine contraction even after the injection of uterotonin to expel the uterine residuals cleanly, and then we should consider to carry out removal surgery. If the uterine cavity remains for a long time in the clinic, it is necessary to carry out a purging operation under ultrasound monitoring or hysteroscopy to promote the removal of uterine cavity residues.