Irregular period. For this long yrs?

My periods were irregular for a very long time, i have consulted many doctors and finally consulted a doctor in Apollo and she said one of my hormone is not secreting properly and due to that i am getting irregular periods. Irregular in the sense i wont get periods for many month like more than 5 months and one day i will get period and the bleeding wont stop even after one and half months then i would consult doc and have medicine then only it will stop. This was the problem. The Apollo doctor prescribed a medicine Familone. I am taking the medicine for more than 7 yrs now. I take the medicine for 21days and stop. I will get periods on the 7th day from stoping the medicine. Then again i will start taking the medicine from 5th day from the day i got periods. Now my question is, is it good taking a medicine for this long yrs? I dont see any visible side effects but everyone is saying that taking a medicine for prolonged time is not at all good for health.