abnormal uterine bleeding
"I switched to this primarily due to the appeal of having only 4 periods a year and stayed on it for 3 years. Generally it was uneventful: I didn't gain weight, it had no effect (positive or negative) on my acne, my breasts stayed the same size. However, it destroyed my libido. It was so gone I thought I was asexual. It wasn't until I couldn't get my script refilled  (I couldn't get an appointment that mixed in with my work schedule), so I had to get off the pill, which then led me to find out that I am not asexual and, in fact, had a libido. Another down point was the spotting I got in between periods and the effects of the period seem to have been compounded (i.e. compared to pills for monthly periods). I was sore, tired, and irritable."