What are common side effects of valerian root?

Published: September 24, 2025
Updated: September 24, 2025

Valerian root is mostly well tolerated; however, there are possible mild side effects, especially with first-time use or high dosing. Most reactions are transient and wear off as your body becomes accustomed to them. As such, knowing what potential reactions look like will help you maximize the safe use of this herb while also knowing when to seek medical attention.

Drowsiness and Fatigue

  • Occurs when exceeding 600mg doses
  • Most noticeable during morning hours
  • Resolves with dosage reduction
  • Avoid driving or operating machinery

Digestive Discomfort

  • Includes nausea and stomach cramps
  • Typically happens without food intake
  • Mitigated by taking with meals
  • Rarely progresses to vomiting

Neurological Reactions

  • Vivid dreams or nightmares
  • Mild headaches during first week
  • Dizziness upon standing quickly
  • Usually subsides within 3-5 days
Side Effect Comparison: Valerian vs Alternatives
Side EffectMorning DrowsinessValerian Frequency
Low (12%)
Pharmaceutical Frequency
High (68%)
Side EffectGastrointestinal IssuesValerian Frequency
Moderate (22%)
Pharmaceutical Frequency
Moderate (31%)
Side EffectHeadachesValerian Frequency
Low (15%)
Pharmaceutical Frequency
High (47%)
Side EffectDependency RiskValerian Frequency
Very Low (3%)
Pharmaceutical Frequency
High (59%)
Based on clinical trial reports

Controlling Side Effects is mostly done by adjusting your intake with a few easy steps. If you find yourself feeling fatigued in the mornings, consider reducing your valerian dosage. Take valerian with food to prevent stomach upsets. Drink ample water to minimize headaches. Side effects are unlikely to require stopping valerian as long as you take the necessary steps to manage them. For the most part, they resolve within the week after using valerian consistently.

Seek medical advice if the side effects do not decrease within two weeks, or become more pronounced. Severe dizziness, vomiting that lasts more than a day, or any allergic reactions should be promptly consulted with a doctor. If your urine is dark or you have jaundice, you should seek medical attention as soon as possible. Your healthcare professional will be able to determine if valerian is appropriate for your unique health situation.

Read the full article: Key Benefits Valerian Root Unveiled

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