"i&#039;ve been on the shot for about 9 years on and off. what i mean by on and off is that i take about 3 shots instead of 4 shots a year. i started doing this because after the 1st year of being on the shot i found out i had precancerous cells in my cervix. not positive that the shot caused this but i give my body a break for several months before i start again. every time i start the cycle again i get a different side-effects. i usually have a very high sex drive during the 1st month and 1/2, i always have acne, always have mood swings and depression, sometimes i get headaches, and i gain weight continuously regardless of diet and exercise."