"it is effective, i have had it for 11 months and at first i didn&#039;t have my period for the next 3 months after the first month of having it, i thought it was great. after that i had my period every 2 weeks if not every other, cramps, headaches, and mood swings. it had been a horrible experience. the weight gain since i have had it in was 30 pounds. i weighed 132 lbs. a year ago and now i weigh 165 lbs.! i haven&#039;t changed my eating habits or working out habits. i love to run and the weight gain has taken a negative toll on it. i definitely do not recommend. 5&#039;7 medium frame, always have been thin"