I have been on Microgestin for 4 months. I take it at the exact time everyday. I am not on any oral antibiotics. When I started my new pack just now I decided to read the drug info it came with, (I should have read it when I first got it but I thought the doctor went over it pretty well) it said that a drug interaction it had was with salicylic acid.. I use a face wash for my acne that has 0.5% salicylic acid in it. I'm very confused because i'm not sure my topical face wash can lower my birth control's effectiveness?