Hello i am taking penicillin for 10 days for strep throat and i am taking loestrin 24fe birth control.i will be finshed taking the penicillin tomorrow but today is the last day of my active/white pill. I start my new cycle on sunday.how long do i have to use a backup metho to avoid pregnancy?
Hi there, You need not use back up method anymore.Moreover, penicillin is a non-enzyme inducing antibiotic, that is, it is not required to take back up method when taking penicillin when on contraceptive pills, the pills are protective in themselves. Since you are starting your new cycle on Sunday, you can start it without feeling the need to take back up, as you have already finished your antibiotic dose as well. Hope this helps. Regards.