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Kelnor Drug Interactions

Kelnor Interactions Explained

The following sections explain in detail the potentially negative interactions that can occur when Kelnor is combined with any of the drugs listed above. It is important to note that if a backup method of contraception is necessary, you may need to use it for quite a while (often an entire cycle). Anytime a backup method of birth control is recommended, make sure to ask your healthcare provider about how long you should use it.
If you do not know what to do about any particular Kelnor drug interaction, make sure to use a backup method of birth control until you can check with your healthcare provider, just to be safe.
Aminoglutethimide (Cytadren)
Taking aminoglutethimide and Kelnor together increases the risk of pregnancy. Do not use these medications together without first talking to your healthcare provider. You may need to use a backup method of contraception, such as condoms.
Aprepitant (Emend)
Aprepitant can make Kelnor less effective, perhaps increasing your chance of pregnancy. Talk with your healthcare provider before using these medications together. You may need to use a backup method of contraception. People who are undergoing chemotherapy commonly use aprepitant, and it is often important for women having chemotherapy to avoid pregnancy.
Barbiturates
Barbiturate medications may cause your body to metabolize the hormones in Kelnor too quickly, possibly increasing your risk of pregnancy. Ask your healthcare provider if you should use a different method of contraception while taking a barbiturate.
Certain Antibiotics
There have been reports of accidental pregnancy occurring in women taking birth control pills with certain antibiotics. However, the significance of this interaction is still uncertain. Some antibiotics are more likely to cause problems than others. If you are taking an antibiotic, ask your healthcare provider if you need to use a backup method of contraception.
Last reviewed by: Kristi Monson, PharmD
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