"i have been on errin norethindrone tablets for almost five months now and have liked it a lot more than regular birth control tablets.  i gained a lot of weight on birth control with estrogen and have not on errin, which i liked. but, it has not helped acne like my old birth control.  i also haven&#039;t had a period since the first week i took errin, which is somewhat concerning, but i&#039;m not pregnant, so i assume it is just my body getting used to the medication.  errin has not effected my mood or mentality."