"i was previously on tri-sprintec for years, when my pharmacy started carrying tri-previfem. i switched thinking it would affect me the same. however, i started getting headaches often, feeling weak, my face broke out, and i had spotting. i know that these effects may come when switching brands, but when i switched from ortho tricyclen lo to its generic, then back to brand, then to tri-sprintec i have never had any problems. i am a pharmacy technician and i have had several customers that have had trouble when switching to previfem or tri-previfem. i will be switching back to tri-sprintec once the pharmacy special orders it."