Resorcinol injection can be used to protect the fetus and relieve symptoms such as uterine smooth muscle spasm. Resorcinol injection is a new type of antispasmodic analgesic, can act directly on the body of the genitourinary tract, gastrointestinal tract smooth muscle, can inhibit uncoordinated, ineffective acute contraction, reduce the oxygen consumption of uterine smooth muscle, injection during pregnancy has a protective effect on the fetus, will not cause a drop in blood pressure, and has no effect on the cardiovascular function of pregnant women. Some people may have an allergic reaction, rash, urticaria and other symptoms, should avoid the simultaneous use of its derivatives, these drugs have antispasmodic effect, the simultaneous use of may have antagonistic effect, the people who are allergic to resorcinol injection need to be prohibited, pregnancy, breastfeeding, young children, the elderly should be used with caution under the guidance of a doctor.