How many days after taking ciprofloxacin will my birth control pills become affective again. I am taking the placebos now due to period Starting soon.

Next package. Anything that effects the effectiveness of oral contraceptives pretty much does so only for the pack you are on while using it. If you simply continued your pack while taking the cipro, (ciprofloxacin) you should be protected when you start the new pack as long as you didn't miss any pills. Hope this helps.