During early pregnancy, 99% of the drugs apply to the “all or nothing” theory I mentioned earlier. It may not cause harm to the fetus, However, There are indeed several special drugs that do not apply to this theory. These drugs include ribavirin and isotretinoin (formerly known as: Isoretinoic acid) and vaccines against measles, rubella and mumps. Due to the long clearance half-life of these special drugs in the human body, It takes a long time, sometimes even several months, for the body to completely expel the drugs from the body. At the same time, these drugs are clearly teratogenic, so not only pregnant mothers but also pregnant women must not contact them. Otherwise, drug residues in the body will Read More …