No. Even in 2012, ob/gyns are split on whether antibiotics affect birth control pills....Some say yes, some say no. However, the antibiotics most likely to affect birth control pill efficacy are the penicillins and the tetracyclines (doxycycline). Ceftin (cefuroxime) typically is in a class of antibiotics that will not affect your birth control pill.
I had intercourse without a condom during ovulation did the cephalexin cancel out my birth control pills?
No. This is a common myth. Antibiotics, except for one called rifampin, do not affect the efficacy of the birth control pill.
I had intercourse without a condom during ovulation and my boyfriend came in me, did the cephalexin cancel out my birth control pills?
No. Typical antibiotics do not decrease the normal effectiveness of birth control pills. This is a common myth.