PYRETHRUM

OTHER NAME(S):

Chrysanth&egrave;me Insecticide, Chrysanthemum cinerariifolium, Dalmation Insect Flowers, Dalmation Pellitory, Pelitre, Piretro, Pyr&egrave;thre, Pyr&egrave;thre de Dalmatie, Pyrethrum cinerariifolium, Tanacetum cinerariifolium.<br/><br/>

Overview

Overview Information

Pyrethrum is a plant (Chrysanthemum cinerariifolium). Pyrethrum is also the name of the crude extract obtained from flowers of this plant.

Be careful not to confuse pyrethrum with pyrethrin. Pyrethrin refers to a more refined extract of pyrethrum. Pyrethrin is in body lice medicines such as A-200 Pyrinate, Barc, Lice-Enz, Licetrol, Pronto, R and C, RID, Tisit, Tisit Blue, and Triple X.

People apply pyrethrum directly to the skin as an insecticide, particularly for head lice, crab lice and their nits, and mites (scabies).

How does it work?

The active chemicals, the pyrethrins, are toxic to insect nervous systems.

Uses

Uses & Effectiveness?

Effective for

  • Head lice and crab lice. Applying pyrethrins to the skin in concentrations of 0.17% to 0.33% for 12-24 hours is effective for treating head lice and crab lice. Pyrethrins are usually combined with piperonyl butoxide (2% to 4%) to increase effectiveness.

Ineffective for

More evidence is needed to rate the effectiveness of pyrethrum for these uses.

Side Effects

Side Effects & Safety

The commercially available combination of pyrethrins (0.17-0.33%) and piperonyl butoxide (2-4%) seems to be safe when applied to the skin in a nonaerosol product.

Pyrethrum is POSSIBLY SAFE when used on the skin in amounts less than 2 grams. While pyrethrum has limited toxicity at low doses, it can cause some side effects such as headache, ringing of the ears, nausea, tingling of fingers and toes, breathing problems, and other nervous system problems.

Special Precautions & Warnings:

Pregnancy and breast-feeding: Not enough is known about the use of pyrethrum during pregnancy and breast-feeding. Stay on the safe side and avoid use.

Children: It’s UNSAFE to put pyrethrum on children less than two years old.

Asthma: Exposure to pyrethrin might make asthma worse. Avoid using pyrethrum or pyrethrin products if you have asthma.

Allergy to ragweed and related plants: The pyrethrum flower or pyrethrin extracted from it may cause an allergic reaction in people who are sensitive to the Asteraceae/Compositae family. Members of this family include ragweed, chrysanthemums, marigolds, daisies, and many others. If you have allergies, be sure to check with your healthcare provider before using pyrethrum.

Interactions

Interactions?

We currently have no information for PYRETHRUM Interactions.

Dosing

Dosing

The following doses have been studied in scientific research:

APPLIED TO THE SKIN:

  • For treating head lice and crab lice: An over-the-counter (OTC) product that combines pyrethrins (0.17% to 0.33%) and piperonyl butoxide (2% to 4%) is applied to the affected area and allowed to remain for at least 10 minutes. The product is then thoroughly washed off with warm water. Pyrethrins are extracted from pyrethrum, and kill lice by harming their nervous systems.

View References

REFERENCES:

  • Covington TR, et al. Handbook of Nonprescription Drugs. 11th ed. Washington, DC: American Pharmaceutical Association, 1996.
  • Drugs in Pregnancy and Lactation. 4th ed. Baltimore, MD: Williams & Wilkins, 1994.
  • Hardman JG, Limbird LL, Molinoff PB, eds. Goodman and Gillman's The Pharmacological Basis of Therapeutics, 9th ed. New York, NY: McGraw-Hill, 1996.
  • Wagner SL. Fatal asthma in a child after use of an animal shampoo containing pyrethrin. West J Med 2000;173:86-7. View abstract.

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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 2018.