Infusion or intramuscular injection during pregnancy itself will not affect the fetus, but it needs to be analyzed according to the drugs used and the week of pregnancy, etc. Usually, the effects of drugs of grades A and B are relatively mild, those of drugs of grades C and D are more significant, and those of drugs of grade X will cause serious harm. 1. Grade A: These drugs have not been found to be harmful to the fetus in a large number of clinical trials and studies, and no evidence of harmful effects on the fetus has been found in subsequent long-term follow-up, so the effects on the fetus are minimal. Common medications include small doses of vitamin A and small doses of folic acid. 2. Grade B: These drugs have been found to have a certain effect on the embryo in animal experiments, but there has not been any related harm in human beings, and no evidence of harmful effects on the fetus has been found in the follow-up after the use of the drugs. Common drugs such as penicillin, cephalosporin antibiotics such as cephalosporin. 3. Grade C: These drugs have a certain probability of causing fetal birth deformities or death and abortion in animal experiments. These drugs should only be used after weighing the advantages and disadvantages and determining that the benefits to the pregnant woman outweigh the harm to the fetus. 4. Grade D: These drugs have been shown to pose a risk to the fetus and should be used only when the pregnant woman is in a life-threatening situation or has a serious medical condition for which there is no alternative drug or regimen. 5. Class X: These drugs pose a serious risk to the fetus and are absolutely contraindicated during pregnancy. Consultation with a clinician is recommended prior to the use of any drug during pregnancy and unauthorized use is prohibited.