Side Effects of Valerian Root Teas

Teas brewed from the root of the valerian plant, embraced for centuries as a mild tranquilizer, are a popular natural remedy. According to the National Institutes of Health (NIH), based on studies on humans and animals, valerian (Valeriana officinalis) contains properties scientifically proven to treat insomnia and ease anxiety. Other scientifically unproven uses listed by NIH include valerian root's purported ability to relieve depression, stomach and menstrual cramps, high blood pressure, digestion, headaches, angina, nervous tension, muscle pain and arthritis. Although valerian is listed on the U.S. Food and Drug Administration's Generally Regarded as Safe (GRAS) list and is considered safe by the American Herbal Products Association, those who drink valerian root tea may encounter side effects, which vary based on occasional or chronic use, and other factors, such as pregnancy and breastfeeding and liver disease.

Side Effects for Occasional Drinkers

Although Valerian root tea most often is well-tolerated with occasional use, minor side effects may include headache, upset stomach, low body temperature, and feeling edgy, dizzy, unsteady and excitable.

Side Effects for Chronic Drinkers

Drinking Valerian root tea for two or more months sometimes reverses its original intended effects and may cause depression and insomnia, as well as night terrors and stomach pain. Chronic use may also diminish concentration and critical thinking. Valerian extracts are highly concentrated; when used in tea brews, they can cause a drug "hangover" effect when used incorrectly or for too long. When you stop drinking the tea suddenly, the effect is described as "Valerian withdrawal," which includes confusion and rapid heart beat.

Pregnant/Breatsfeeding or Liver Disease

The safety of valerian root tea is not clear for pregnant or breastfeeding women.

Valerian root teas are a no-no for women who are pregnant or breastfeeding because its safety during pregnancy is undetermined and it is unknown whether it passes through breast milk. People who have liver disease or damage also are discouraged from taking Valerian, especially with medications that metabolize the liver.

Drug Interactions

Little is known about the effect Valerian may have with other drugs or herbs.

Little research exists to assess the side effects of ingesting any combination of herbs, supplements, drugs and food. The NIH suggests valerian may increase the drowsiness effect inherent in some prescription and over-the-counter drugs and when valerian is mixed with alcohol and recreational drug use. The NIH also reports incidences of confusion, agitation and anxiety when taken with some prescription medications and concern over valerian's affect on anti-seizure medications and those metabolized by the liver. When combined with other herbs and dietary supplements, valerian root has led to sweating, nausea, weakness, increased pulse and blood pressure, and muscle cramps.