Mycoplasma treatment drugs include erythromycin and azithromycin, which may cause gastrointestinal reactions and allergic reactions in pregnant women. 1. Gastrointestinal reaction: when using antibiotic treatment, it may cause gastrointestinal flora disorders, which may lead to gastrointestinal reactions such as nausea, vomiting and diarrhea. At the same time, as the drug is metabolized by the liver, abnormal liver function tests and liver dysfunction may occur. 2. Allergic reaction: pregnant women may have hives, erythema multiforme and so on due to allergic reaction during the use of the drug. If pregnant women are allergic to this type of drugs should be prohibited such drugs. Note that if pregnant women have abnormal liver function, the dosage should be reduced. Liver function should be checked regularly during the use of the drug. In addition, since the drug can pass through the placental barrier and enter the fetal circulation, pregnant women should use it under the guidance of a doctor and avoid unauthorized use of the drug to avoid adverse effects.