There is no single toxic dose for valerian root. The safe amount depends on the product, including whether it contains dried root, a concentrated extract, tea, tincture, or a combination of herbs.
For most healthy adults, research has used 300 to 600 mg of valerian extract daily for up to six weeks. That does not establish a safe higher dose. Follow the product label and do not take more than directed.
If you have taken more than recommended, call Poison Control at 1-800-222-1222 in the United States. Call 911 immediately if the person collapses, has a seizure, has trouble breathing, or cannot be awakened.
Valerian Root Dosage at a Glance
| Product or situation | What is known |
|---|---|
| Typical short-term adult research dose | 300 to 600 mg of a valerian preparation daily |
| Dried valerian root | Often measured in grams, so it cannot be directly compared with extract milligrams |
| One accidental extra dose | Often does not cause serious toxicity, but individual advice is still appropriate |
| Repeatedly exceeding the label dose | Not recommended because long-term safety and toxicity thresholds are uncertain |
| Valerian mixed with alcohol or sedatives | Greater risk of excessive drowsiness and impaired judgment |
Check what the product's milligram amount refers to. It may describe the amount of whole valerian root or a concentrated extract. A 500 mg extract is not necessarily equivalent to 500 mg of dried root.
What Dose of Valerian Is Reasonable for Adults?
For most healthy adults, 300 to 600 mg daily for up to six weeks is the short-term range most clearly supported by safety research. The long-term safety of valerian remains unknown.
European Medicines Agency guidance for certain regulated valerian medicines lists individual doses of 450 to 600 mg of dry extract, equivalent to approximately 2 to 3 grams of herbal substance, depending on the preparation. These figures apply to specific medicinal products and should not automatically be used for every dietary supplement.
What Happens If You Take Too Much Valerian?
Too much valerian may cause:
- Excessive sleepiness or daytime sedation
- Dizziness or impaired coordination
- Mental dullness or confusion
- Headache
- Stomach upset, nausea, or abdominal cramps
- Vivid dreams
- Excitability or uneasiness
Poison Control describes valerian as generally well tolerated, but product strength can vary. A one-time accidental extra dose often does not cause serious harm in an otherwise healthy adult. The right response still depends on the product, amount, age, symptoms, and other substances taken.
When Is Valerian More Dangerous?
The risk is higher when valerian is combined with substances that also cause drowsiness, including:
- Alcohol
- Prescription sleeping pills
- Benzodiazepines such as diazepam or lorazepam
- Opioid pain medicines
- Sedating antihistamines
- Other sleep or relaxation supplements
- Products containing kava, passionflower, melatonin, or other sedatives
NCCIH advises avoiding valerian with alcohol or sedatives because valerian may increase sleepiness. Ask a doctor or pharmacist before using valerian with any prescription or over-the-counter medicine.
What Should You Do After Taking Too Much Valerian?
If you have taken more valerian than directed:
- Do not take another dose.
- Do not drink alcohol or take other sedatives.
- Keep the product container nearby and note how much you took and when.
- In the United States, call Poison Control at 1-800-222-1222 for product-specific advice.
- Call 911 for difficulty breathing, a seizure, collapse, severe confusion, or an inability to wake the person.
Do not induce vomiting unless a poison specialist or medical professional tells you to do so.
Who Should Avoid Valerian or Seek Medical Advice First?
Ask a healthcare professional before using valerian if you:
- Are pregnant or breastfeeding
- Are under 12
- Have liver disease
- Take prescription or over-the-counter medicines
- Use alcohol or sedative drugs regularly
- Need to drive or operate machinery
Valerian has rarely been linked with liver injury, particularly when used with other herbal products. Its long-term effects on the liver are not established.
Bottom Line
There is no universal maximum safe dose for every valerian product. For adults, 300 to 600 mg daily for up to six weeks is the short-term range most clearly supported by safety research. Taking more than the label recommends, combining valerian with alcohol or sedatives, or using it for longer periods increases uncertainty and risk.
If you took too much, contact Poison Control instead of judging the situation from the milligram number alone.