birth control
"I had Implanon fitted 6 years ago after an unwanted pregnancy.  I've had no side effects until now.  My second implant is now at an end.  I only realized it was running out because in the last couple of months I've had really irregular periods so went to the doctor.  I've got to wait a week until they can remove it and put a new one in, but the stomach cramps are now really unbearable.  But I will still be having another put in since the cramps are apparently down to it running out. 
Also, some confusion with the medicine Modafinil.  This site says it is not compatible.  But both my doctor and gyno say it's okay."