Her husband was on penicillin, but the doctor couldn't imagine any way that his antibiotics could affect her.

As antibiotics could adversely affect the babies, she declines treatment, and gives birth to Steffy and Phoebe before recovering.

"Narrow-spectrum" antibacterial antibiotics target specific types of bacteria, such as Gram-negative or Gram-positive bacteria, whereas broad-spectrum antibiotics affect a wide range of bacteria.

First, antibiotics affects the gut microbiota because of their differential effect on different types of bacteria.

Antibiotics (Aminoglycoside antibiotics) interacts with MAGNESIUM Some antibiotics can affect the muscles.

However, new research shows that antibiotics, with the exception of rifampin and rifabutin, do not affect the effectiveness of hormonal contraceptives, such as the pill, patch or vaginal ring.

This change in advice comes because to date there is no evidence which conclusively demonstrates that antibiotics (other than rifampicin or rifabutin) affect these contraceptives.

However, since most antibiotics non-specifically target bacteria and do not affect fungi, oral antibiotics can lead to an "overgrowth" of fungi and cause conditions such as a vaginal candidiasis (a yeast infection).

Although most antibiotics probably do not affect hormonal birth control such as pills, patch or ring, some antibiotics may decrease their effectiveness.

Not all antibiotics affect birth control pills.