Medicinal use of evening primrose oil stems from the presence of a fatty acid called gamma-linolenic acid in the plant. The oil is derived from the wildflower's seeds and then packaged in capsules. Medicinal uses have included treating skin conditions such as eczema, symptoms related to menopause and certain types of arthritis. However, studies have not shown it to be effective for most uses, according to the National Institutes of Health. Evening primrose oil is generally well tolerated when used as directed. However, always consult your medical practitioner before using evening primrose oil to improve your health.
Seizures
Seizures have been reported in several people using evening primrose oil. These reports include people with previously diagnosed seizure disorders, as well as people taking evening primrose oil and anesthetic medications, according to the National Institutes of Health. Because of this risk, people with seizure disorders and those taking drugs such as thioridazine, fluphenazine, chlorpromazine and trifluoperazine to treat mental illnesses should not take evening primrose oil. People scheduled to undergo surgery involving anesthesia should stop taking EPO two weeks before the procedure. Always speak with a medical professional before using evening primrose oil supplements.
Gastrointestinal Distress
Some users of evening primrose oil have experienced gastrointestinal distress, such as nausea, abdominal pain and loose stools. These side effects are generally mild, but loose stools and stomach pain could mean your dosage is too high and must be lowered, according to the University of Maryland Medical Center. Always consult a medical professional before taking evening primrose oil.
Headaches
In people who develop headaches, they are usually mild and only occasional, according to the National Center for Complementary and Alternative Medicine.
Blood Pressure
The presence of gamma-linolenic acid in evening primrose oil may cause a decrease in blood pressure in some users. This effect has been demonstrated though animal studies, but no human testing has conclusively demonstrated this effect, according to the National Institutes of Health. Because of the potential risks associated with its use, speak with your medical practitioner before taking evening primrose oil.
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