Valerian is likely safe for most people when used in medicinal amounts short-term. Clinical studies have reported safe use of valerian for medicinal purposes in over 12,000 people in trials lasting up to 28 days. The safety of long-term use is unknown. Some information suggests that valerian might also be safe when taken by children for 4-8 weeks.
Valerian can cause some side effects such as headache, excitability, uneasiness, and even insomnia in some people. A few people feel sluggish in the morning after taking valerian, especially at higher doses. It is best not to drive or operate dangerous machinery after taking valerian. The long-term safety of valerian is unknown. To avoid possible side effects when discontinuing valerian after long-term use, it is best to reduce the dose slowly over a week or two before stopping completely.
Special Precautions & Warnings:
Pregnancy or breast-feeding: There is not enough information about the safety of valerian during pregnancy or breast-feeding. Stay on the safe side and avoid use.
Surgery: Valerian slows down the central nervous system. Anesthesia and other medications used during surgery also affect the central nervous system. The combined effects might be harmful. Stop taking valerian at least two weeks prior to a scheduled surgery.