<s>[INST] iam 30 yrs and going thru infertility treatment recently my doctor adviced me to take cetapin as my father is diabetic . but after starting with this med first month was ok but second month i skipped my periods .so is it possible it could be due to this med.preg is not there.my dosage(1000mg/day). [/INST] Hello, Cetapin which contains metformin can not cause skipped periods. It is also true that during the course of infertility treatment, irregular periods are not unusual so I do not think there is a need to worry. Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr. Prabhash Verma, General & Family Physician </s>