Etonogestrel
"Live in the UK. Got this because naturally my mood swings were crazy (very extreme & hormonally-driven) & I wanted to stabilise them a bit. I didn't take it for birth-control, happy with condoms. Took the same drug in pill form for 3 months to see what it would do to my moods. Naturally, I suffer from my hormones: grumpiness, sex drive and appetite are erratic, hated it. The pill did seem to stabilise my moods, so I had the implant put in. It has been 3 years, only side affect may be weight gain, unable to say if that's just me getting older (30 now). If you're not sure if you'll like it, why not try the pill version first before you get the implant?"