Taking St. John's Wort With Ibuprofen

The pharmacist discusses whether or not there is a potential interaction between St. John's wort and ibuprofen.

Question

I am wondering if it is safe to take St. John's wort with ibuprofen?

Asked by Sandra76 On Dec 13, 2018

Answered by
Medical Content Reviewed By PharmacistAnswers Staff

On Dec 13, 2018

St. Johns Wort Flower On White BackgroundSt. John's Wort and ibuprofen (brand names Advil, Motrin) are considered safe to take together. There are no known drug interactions.

While it can often be difficult to assess potential drug interactions with herbal products due to the lack of available information, St. John's Wort is one of the most studied in regard to efficacy, side effects and potential drug interactions.

There have even been several studies that have specifically evaluated the effects of combined use of ibuprofen and St. John's Wort.

One such study, 'Effects of St. John's Wort Supplementation on Ibuprofen Pharmacokinetics' concluded the following:

St. John's wort administration for 21 days had no apparent clinically important impact on the single-dose pharmacokinetic parameters of S(+)- and R(-)-ibuprofen.

There are other studies that indicate St. John's Wort can inhibit the activity of a variety of CYP metabolizing enzymes, particularly CYP 2C9. This has been shown to lead to potentially serious interactions with drugs metabolized by this enzyme, notably warfarin, an anticoagulant.

I mention this because ibuprofen is metabolized by CYP 2C9 as well. Nevertheless, the studies that have evaluated St. John's Wort effect on ibuprofen have not shown any clinically significant interactions or need for dose adjustment.

The next sections provide additional information regarding St. John's Wort and ibuprofen.

Answer Summary

Although studies show that St. John's Wort could potentially affect the metabolism of ibuprofen, there have been no clinically significant drug interactions reported, even in studies in which both were given together.

About St. John's Wort

St. John's wort is a flowering plant and is among the most popular, and well studied, herbal products used for medicinal purposes. It is used for a range of indications including:

It has many active constituents, notably hypericin, which is thought to be primarily responsible for its effects. Other related compounds found in the plant are medicinally active as well. These include:

  • Hyperforin
  • Adhyperforin

Although St. John's wort has been well studied and has a large body of evidence purporting its effects, it must be used cautiously due to the high number of potentially serious drug interactions as it can inhibit a variety of metabolizing enzymes in the body.

Just a small sampling of known drug interactions include:

Prior to starting therapy with St. John's wort, it is extremely important to consult your doctor or pharmacist regarding potential drug interactions.


Drug interactions aside, St. John's wort is generally well tolerated. The most commonly reported side effects include:

  • Insomnia
  • Vivid dreams
  • Restlessness
  • Irritability
  • Nausea
  • Dry mouth
  • Headache

In fact, several studies report that St. John's wort in many cases is better tolerated than conventional antidepressants.

About Ibuprofen

Ibuprofen is a NSAID (non-steroidal anti-inflammatory drug) that is available both over the counter (200 mg), or via prescription (400 mg, 600 mg, 800 mg). It is also available in liquid dosage forms.

The onset of action of ibuprofen is generally 15 to 30 minutes, with peak effects occurring within 1 to 2 hours. It has a duration of action around 4 to 6 hours per dose.

It should be taken with food to minimize GI discomfort. Long term use of ibuprofen should only be done under the supervision of your doctor due to the risk of gastrointestinal and cardiovascular side effects.

About the Pharmacist

Dr. Brian Staiger Pharm.D

Dr. Brian Staiger is a licensed pharmacist in New York State and the founder of PharmacistAnswers.com. He graduated from the University At Buffalo with a Doctor Of Pharmacy degree in 2010. He has been featured in several publications including the Huffington Post as well as a variety of health and pharmacy related blogs. Please feel free to reach out to him directly if you have any questions or want to connect! [email protected]; Office: 716-389-3076

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