Pregnant women can take anti-allergy drugs, but use with caution, need to use anti-allergy drugs under the guidance of doctors in regular hospitals, common anti-allergy drugs are cetirizine, chlorpheniramine, benadryl and so on. 1. Cetirizine: special attention should be paid to the administration of drugs to pregnant women. It is not recommended for women in the first trimester of pregnancy. ADVERSE REACTIONS: Occasionally, mild and transient adverse reactions have been reported in patients. Such as headache, dizziness, drowsiness, agitation, dry mouth, abdominal discomfort. CONTRAINDICATIONS: Contraindicated in persons who are hypersensitive to the components of the product, hydroxyzine, or any other piperazine derivative; contraindicated in patients with severe renal impairment; the product contains lactose. Not to be taken by patients with rare hereditary galactose intolerance, Lapp lactase deficiency or glucose-galactose malabsorption syndrome. 2. Chlorpheniramine: Use with caution in pregnant and lactating women. The main adverse reactions are drowsiness, thirst, polyuria, sore throat, drowsiness, feeling of weakness, palpitations, skin ecchymosis, bleeding tendency. Contraindications are not clear. 3. Diphenhydramine: the use of this product during pregnancy, there is a possibility of increasing the incidence of cleft palate, inguinal hernia and genitourinary malformations in infants, pregnant women should be used with caution. Adverse reactions are common: central nervous system inhibition, ataxia, nausea, vomiting, loss of appetite. Contraindications: Myasthenia gravis, closed angle glaucoma, prostate hypertrophy is prohibited. It is prohibited for those who are allergic to this product. Contraindicated in neonates, premature infants. For pregnant women, the use of anti-allergy drugs must go to a regular hospital, under the guidance of the doctor to standardize the use of drugs.