I'm not sure, but since I have started taking Yasmin 3 weeks ago, I am perspiring like crazy! The weather is changing towards summer, and there's been a lot of rain and humidity, but my perspiration is beading down my forehead all the time, it's gotten to be quite embarrassing. I don't see perspiration as a side-effect, however, I don't know what else could be contributing to it but Yasmin. I used to take ortho-tricyclen-lo, but I experienced a lot of break-through bleeding - for instance, last month, my period spotted along for 2 weeks! So, now I'm on Yasmin and I hope to get my period soon so I can see what it's all about.