Can i take b vitamins with doxycycline or will the vitamins stop the doxy from working ? thanks

Don't take together: B Vitamins can decrease effectiveness of Doxycycline. It is considered a minor interaction. Hold off on the supplements while taking the antibiotic unless your doctor has prescribed the supplement. In that case discuss this with that doctor. Seehttp://umm.edu/health/medical/altmed/supplement-interaction/possible-interactions-with-vitamin-b12-cobalamin

No problem: Vitamins don't interfere with doxycycline or any other antibiotics. Don't owrry about it.