What is the optimal time window for medical abortion? Medical abortion is the use of drugs early in pregnancy to interrupt pregnancy. Medical abortion is safe and effective, especially under the two-child policy encouraged by national policies, medical abortion has become more widely used. But what is the optimal time window for medical abortion? ) Principle of Medical Abortion Medical abortion interrupts pregnancy by using drugs to interfere with the function of progesterone. Specifically, the drug interferes with the release of progesterone from the placenta to the uterus, preventing the fertilized egg from developing. Medical abortion should be performed early in pregnancy. If the medication is delayed, it will