Overview

Knotweed is an herb. The whole flowering plant is used to make medicine.

Knotweed is used for swelling (inflammation) of the main airways in the lung (bronchitis), cough, sore throat, a mild form of gum disease (gingivitis), and other conditions, but there is no good scientific evidence to support these uses.

How does it work ?

Knotweed might be able to reduce the swelling and bleeding that occur with gum disease.

Knotweed might be able to reduce the swelling and bleeding that occur with gum disease.

Uses & Effectiveness ?

Insufficient Evidence for

  • A mild form of gum disease (gingivitis). Early research suggests that a root extract of knotweed might be useful as a mouth rinse to treat gingivitis, decreasing bleeding and swelling of the gums.
  • Swelling (inflammation) of the main airways in the lung (bronchitis).
  • Cough.
  • Skin irritation.
  • Sore throat.
  • Stopping bleeding.
  • Tuberculosis.
  • Other conditions.
More evidence is needed to rate the effectiveness of knotweed for these uses.

Side Effects

When taken by mouth: Knotweed is POSSIBLY SAFE when taken by mouth short-term. Three to four cups of tea per day, each prepared with 1.5 grams of knotweed powder, have been used with apparent safety.

When applied to the skin: Knotweed is POSSIBLY SAFE when used in a mouthwash twice daily for up to 2 weeks.

Special Precautions and Warnings

When taken by mouth: Knotweed is POSSIBLY SAFE when taken by mouth short-term. Three to four cups of tea per day, each prepared with 1.5 grams of knotweed powder, have been used with apparent safety.

When applied to the skin: Knotweed is POSSIBLY SAFE when used in a mouthwash twice daily for up to 2 weeks.
Pregnancy and breast-feeding: There isn't enough reliable information to know if knotweed is safe to use when pregnant or breast-feeding. Stay on the safe side and avoid use.

Interactions ?

We currently have no information for KNOTWEED overview.

Dosing

The appropriate dose of knotweed depends on several factors such as the user's age, health, and several other conditions. At this time there is not enough scientific information to determine an appropriate range of doses for knotweed. Keep in mind that natural products are not always necessarily safe and dosages can be important. Be sure to follow relevant directions on product labels and consult your pharmacist or physician or other healthcare professional before using.
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CONDITIONS OF USE AND IMPORTANT INFORMATION: This information is meant to supplement, not replace advice from your doctor or healthcare provider and is not meant to cover all possible uses, precautions, interactions or adverse effects. This information may not fit your specific health circumstances. Never delay or disregard seeking professional medical advice from your doctor or other qualified health care provider because of something you have read on WebMD. You should always speak with your doctor or health care professional before you start, stop, or change any prescribed part of your health care plan or treatment and to determine what course of therapy is right for you.

This copyrighted material is provided by Natural Medicines Comprehensive Database Consumer Version. Information from this source is evidence-based and objective, and without commercial influence. For professional medical information on natural medicines, see Natural Medicines Comprehensive Database Professional Version.
© Therapeutic Research Faculty 2020.