<s>[INST] I have been on Yaz (contraceptive pill) for the last year and a half. My doctor prescribed it due to the shorter break between pills and it s low levels of oestrogen as I have always had fairly heavy periods. I had some problems in the middle, but am now very good. Unfortunately it is prescribed in Australia and it is getting too hard to have it sent to me so I need to change pills. I have access to 3 pills - Mercilon, Marvelon and Diane at my local pharmacy in south east asia and am hoping to choose the one that will be the most similar to avoid side effects. Thank you. [/INST] Hi, Looking at your requisition of a combined low estrogen containing contraceptive pill Marvelon would match with Yaz (you had been taking). I would suggest to get examined internally before starting new pill just to check personal suitability & take the medicine regularly, at same time of the day & without a break. Hope I have answered your query. Let me know if I can assist you further. Regards, Dr. Vasudha Jayant Athavale, General & Family Physician </s>