After pregnancy, pregnant women have some changes in the enzyme, the metabolism of certain drugs have a certain impact. Drugs are not easy to detoxify and excretion, may accumulate poisoning, fetal organs in the early pregnancy, the formation of the fetus, the drug has a certain impact, it is best not to take a cold medicine. But everything is divided into two, pregnant women have a certain degree of risk, is not completely useless. Some diseases on the fetus, the impact of the mother far more than the impact of drugs, then, weighed against the pros and cons, under the guidance of a doctor, rational drug use.