It is well known that many medications, especially antibiotics, can decrease the effectiveness of birth control pills, or oral contraceptives. However, this downside does not apply to intrauterine devices, like Mirena ( Do Antibiotics Affect IUD, NuvaRing vs Mirena ).
The number of antibiotics that are thought to affect how well certain hormonal contraceptives work include Rifampicin (Rifadin, Rimycin) and rifabutin (Mycobutin). However, these antibiotics are only used to treat serious infections, such as tuberculosis and methicillin-resistant Staphylococcus aureus (MRSA). They are also used for preventing meningitis, which is an infection around the brain or spinal cord.
The reason these antibiotics can make these contraceptives less effective is that they can reduce the level of oestrogen and/or progestogen in the bloodstream, which are key hormones provided by the contraceptives to prevent conception. Decreasing them raises the likelihood of pregnancy.
In summary, antibiotics can affect forms of hormone contraceptives, which include:
- combined pill (containing oestrogen and progestogen)
- progestogen-only pill
- implants (e.g. Implanon, which is a thin, white, plastic rod designed to release progestogen when placed under the skin of upper arm).
- vaginal ring (e.g. NuvaRing; a soft plastic ring inserted into the vagina that releases oestrogen and progestogen).
However, antibiotics are UNLIKELY to affect the following forms of contraceptives:
- progestogen injection
- intrauterine device (IUD) (e.g. copper IUD devices, or Mirena, a small plastic device that releases progestogen)
- barrier methods (such as condoms or diaphragm).
Do Antibiotics Affect Mirena ? No !!!
As previously discussed, the Mirena, which is an intrauterine device, works primarily through its physical presence in the uterus, thus preventing pregnancy.
In addition to its presence, the Mirena device also releases hormones, which steadily change the uterine lining and decrease spotting and menstruation over a long time period.It is important to know, however, that these hormones are a backup function, and that it works just as effectively even without these hormones.
Many older intrauterine devices, such as the Paraguard or copper device, did not rely on hormones at all for their effectiveness. Therefore, if using the Mirena device you can feel safe in knowing you can take a full course of antibiotics without worrying about them increasing the risk of pregnancy.
I hope the above details about the interaction between Antibiotics and Mirena will help you a lot.