Fennel

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Are there any interactions with medications?



Birth control pills (Contraceptive drugs)
Interaction Rating: Moderate Be cautious with this combination.
Talk with your health provider.

Some birth control pills contain estrogen. Fennel might have some of the same effects as estrogen. But fennel isn't as strong as the estrogen in birth control pills. Taking fennel along with birth control pills might decrease the effectiveness of birth control pills. If you take birth control pills along with fennel, use an additional form of birth control such as a condom.

Some birth control pills include ethinyl estradiol and levonorgestrel (Triphasil), ethinyl estradiol and norethindrone (Ortho-Novum 1/35, Ortho-Novum 7/7/7), and others.



Ciprofloxacin (Cipro)
Interaction Rating: Moderate Be cautious with this combination.
Talk with your health provider.

Ciprofloxacin (Cipro) is an antibiotic. Fennel might decrease how much ciprofloxacin (Cipro) the body absorbs. Taking fennel along with ciprofloxacin (Cipro) might decrease the effectiveness of ciprofloxacin (Cipro). To avoid this interaction, take fennel at least one hour after ciprofloxacin (Cipro).



Estrogens
Interaction Rating: Moderate Be cautious with this combination.
Talk with your health provider.

Large amounts of fennel might have some of the same effects as estrogen. But fennel isn't as strong as estrogen pills. Taking fennel along with estrogen pills might decrease the effects of estrogen pills.

Some estrogen pills include conjugated equine estrogens (Premarin), ethinyl estradiol, estradiol, and others.



Tamoxifen (Nolvadex)
Interaction Rating: Moderate Be cautious with this combination.
Talk with your health provider.

Some types of cancer are affected by hormones in the body. Estrogen-sensitive cancers are cancers that are affected by estrogen levels in the body. Tamoxifen (Nolvadex) is used to help treat and prevent these types of cancer. Fennel seems to also affect estrogen levels in the body. Taking fennel along with tamoxifen might decrease the effectiveness of tamoxifen (Nolvadex). Do not take fennel if you are taking tamoxifen (Nolvadex).

Dosing considerations for Fennel.

The following doses have been studied in scientific research:

BY MOUTH:
  • For colic in breast-fed infants: a specific multi-ingredient product containing 164 mg of fennel, 97 mg of lemon balm, and 178 mg of German chamomile (ColiMil) twice daily for a week.

Therapeutic Research Faculty copyright

Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


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