text: how does antibiotics affect birth control?   health care providers, clinicians, and researchers have been debating the potential of antibiotics hindering the effectiveness of oral contraceptives for quite some time. there have been several research studies that concluded that some antibiotics do indeed decrease the effectiveness of the pill. hence, it becomes more likely that an unintended pregnancy could occur.  the general recommendation when taking antibiotics for a short amount of time is to use an additional backup contraceptive method such as a latex condom during the treatment time and for one week afterward. when taking antibiotics for a long period of time, the general recommendation is to use an additional backup method for the first two weeks of the antibiotic use.  it also is important to remember that you should continue using the pill unless directed otherwise by your health care provider. he/she may provide more specific instructions based on your individual situation, medication, or health status.