Does chlamydia medicine affect birth control pills?

Chlamydia: Medication used in the treatment of chlamydia has no effect on birth control pills

Antibiotics: Antibiotics can affect birth control and possibly decrease their effectiveness to 97 or 98% from 99. So even though they are still very effective, I always recommend adding condoms to sex when on antibiotics as you do not want to be in the 1%. Best wishes.