Our study is a rewiew of Methotrexate therapy in obstetrica? diseases such us: hydatidiform mole, and medical abortion. In the medical world, methotrexate is a citostatic drug used in neoplastic diseases. The clinical pharmacology data regarding methotrexate is presented, alongside route of administration and therapeutic effects in malignant disease, hydatiform mole, and medical abortion. The use of methotrexate in medical abortion and ectopic pregnancy is a great accomplishment, as it replaces a surgical intervention marred by characteristic side effects, with similar results.