Men are not allowed to have children while taking entecavir medication. Entecavir is an antiviral drug that is mainly used to treat hepatitis B. If a woman wants to get pregnant and have a baby, it is best to prepare for pregnancy only after three months of entecavir discontinuation. If she gets pregnant while taking the drug, it is easy to adversely affect the development of the embryo and can also lead to malformations. Therefore, from the point of view of eugenics, women should adjust their bodies during the preparation period and should not take drugs indiscriminately. It is also important to avoid the adverse effects of bacteria, viruses and radiation, to stay relaxed, to exercise and to strengthen the body to prepare for pregnancy. It is also necessary to take small doses of folic acid tablets during pregnancy preparation to prevent fetal malformations.