Should I continue to use aczone or differin after my acne has cleared and I'm satisfied with results?

I use aczone in the morning and Differin in the evening. I take spironolactone am/pm. I have been doing this routine since summer 2014. When I have stopped the routine, I have had breakouts in the past. I'm wondering if these medications are preventative or if I don't need to continue taking some topicals due to improved results.