"this completely broke me out in fluid filled hives all over my heck, chest, shoulders, back, etc. i assume i am allergic to one of the hormones in it. as soon as i stopped taking it, the acne and hives went away. as for a time frame, i took it for 3 days when the acne started. stopped after a month. took another month for the acne to completely go away. this could just be me, because i tried the iud next and was the 1% of women that it didn&#039;t work for - my body expelled it and wouldn&#039;t allow it to stay in place. however, i would not recommend this pill to a friend."