birth control
"This has worked so well for me! After it was implanted I noticed my moods were more balanced (I had previously been taking the daily pills) and I haven't had a menstrual cycle whatsoever for three months (so far). It has been AMAZING. I love it. 
I have noticed infrequent mild acne and slight weight gain (3 pounds in 3 months while I'm actually on a diet) but nothing to the point where I'd consider removing the implant."