Tri-Sprintec
"I got Tri Sprintec as a birth control but I should have gone on it a long time ago to regulate periods. I love being able to predict when I'll start bleeding and I love that it has shortened my periods (Now it is six days). 
I had been on doxycycline for acne but it conflicted with the pill so I stopped. The first month of Tri Sprintec I was worried because I didn't stop bleeding. After the first month though, I've had no problems and no irregular bleeding. I've been on it for half a year."