###Human: Is it safe to take Sysron to stop prolonged period? ###Assistant: Hi. First get ultrasound gynecology done to know the endometrial thickness. If it is less than 5 to 6 mm, then this medicine, Sysron (Norethisterone) will not stop the bleeding, but instead, you need to take combination oral contraceptive pills to stabilize the lining. If the lining is quite thick then, Sysron will work. Also, get your thyroid profile and S prolactin, fasting blood sugar and fasting insulin, on empty stomach done.