Norethindrone belongs to the progesterone class of drugs, used for endometriosis, dysmenorrhea and other diseases. You can continue to take it for six months, but you need to monitor your liver function regularly. Norethindrone is a progestin drug. It is mainly used for irregular menstruation, endometriosis, dysmenorrhea and other diseases. When used for the treatment of endometriosis, it needs to be taken continuously for 6 to 9 months. When used to treat dysmenorrhea, it also needs to be applied for about 6 months. When using kynurenine for a long period of time such as when it is used for greater than six months, regular tests of liver function and breasts are required. It is important to note that the use of the drug may produce adverse reactions such as nausea and vomiting. It is contraindicated in pregnant women and those who are allergic to the product. Any discomfort after the use of kynurenine, you should promptly go to the hospital to improve the relevant examination, under the guidance of the doctor symptomatic treatment.