I take a birth control pill called Norimin (I live in New Zealand so odd brands to most, but its your typical 21 days on, 7 days off kind of pack) but I have been stacking my packs for about 5 months now - my doctor told me that it was fine to do but I have since read differing opinions on the matter. I have terrible periods so like to avoid them as much as possible but since I have been stacking I feel like I have put on quite a bit of weight and have a loooooooow sex drive. So, VP, what I'd like to know is: can stacking pills amplify the normal side effects of birth control pills? And is there any proven medical advantage/disadvantage in stacking pills long term? I've read so much different stuff trying to prove each side of the story.