Ohio State University Extension Bulletin

Head Lice

Bulletin 893-01

Prescription-Only Insecticidal Treatments

Trade Name
(Company)		 Active
Ingredient
and Percent
Concentration		 Type of
Product		 "Claims"a and
Additional Package
Contents
Ovide® (Genderm) Malathion 0.5% Lotion
  • Effectiveness is very dependent on inert ingredients (excipients).
  • Flammable.
  • Very strong odor.
  • Resistance has developed in many regions of the world.
Kwell®
(Reed and Carnick)		 Lindane 1% Shampoo
  • Can be obtained only by prescription for 2nd-line treatment.
  • Seldom recommended because of health concerns.
  • Potential neurotoxicity to humans.
  • Has been associated with seizures, convulsions, etc.
  • Readily absorbed by human skin.
  • Head lice have developed various levels of resistance throughout the world.
  • May not kill nits (eggs).

aBeware of any false advertising. Carefully read the label and all directions before purchasing a product. It is not necessary or advisable to apply insecticides to clothing, mattresses, or other places in the environment for head lice control.

bPlastic nit combs typically are not useful because the teeth tend to bend and spread apart and thereby bypass nits and head lice; they also tend to break easily. Short-toothed combs, whether plastic or metal, are ineffective in combing through many types of hair.

cPiperonyl butoxide included as a synergist to increase insecticidal activity.

dBe aware of potential for an allergic reaction. Immediately consult a physician if an allergic response is indicated, and avoid future use.

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