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Derbac-M Liquid (150ml)

Derbac-M Liquid (150ml)

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Total: £14.99

Product Summary

Derbac M Liquid is a liquid emulsion containing the active ingredient malathion.

It is used to eradicate head lice, pubic lice and their eggs; and for the treatment of scabies in adults, the elderly and children aged 6 months and over.

As Derbac-M does not contain alcohol, it may be more suitable for those with asthma or eczema.


Adults, the elderly and children aged 6 months and over:

For the treatment of head lice:

  • Apply sufficient liquid to dry hair, ensuring that no part of the scalp is left uncovered.
  • Work into the hair, spreading the liquid evenly from root to tip.
  • Leave the hair to dry naturally in a warm but well-ventilated room.
  • After 12 hours, or the next day if preferred, shampoo hair in the normal way.
  • Rinse the hair and comb while wet to remove dead lice and eggs (nits) using a nit comb.

The treatment should be repeated after 7 days.

For treatment of crab (pubic) lice:

  • Apply to the entire skin surface.
  • Pay particular attention to all hairy areas, including beards and moustaches.
  • Avoid any other areas above the neck.
  • Leave on for at least 1 hour before washing, but preferably leave on overnight.
  • Wash off in the usual manner.
  • Repeat the treatment after 7 days.

For the treatment of scabies:

  • Apply to the entire skin surface.
  • For adults, it may not be necessary to apply above the neck.
  • If used on children under the age of 2 years, apply a thin film of the liquid to the scalp, face and ears, avoiding the eyes and mouth.
  • Do not wash off or bathe for 24 hours.
  • If hands or any other parts must be washed during this period, reapply the treatment to those areas immediately.
  • Repeat the treatment after 7 days.


Malathion 0.5% w/w, methyl hydroxybenzoate, propyl hydroxybenzoate, Lanette wax SX, potassium citrate, citric acid, perfume HT 52, Water

Warnings and Restrictions

  • Avoid prolonged or repeated use of this product.
  • Do not use this product more than once a week.
  • Do not use this product for more than 3 consecutive weeks.
  • If you are a healthcare professional treating a large number of patients, wear protective plastic or rubber gloves.
  • Avoid contact with the eyes.
  • Use this medicine only on your skin.
  • Do not use on broken or secondarily infected skin.
  • This product should not be swallowed. If ingested, contact a doctor or hospital immediately.
  • This product contains methyl hydroxybenzoate (E218) and propyl hydroxybenzoate (E216), which may cause allergic reactions (possibly delayed).
  • If you have sensitive skin, test a small area before use.

If you suffer from asthma, consult a doctor or pharmacist before use.

Pregnancy and breastfeeding

If you are pregnant or breastfeeding, think you may be pregnant or are planning to have a baby, ask your doctor or pharmacist for advice before using this product.

Children under 6 months:

Do not use on children under 6 months unless your doctor tells you to.

Do not use Derbac M liquid:

  • If you are allergic to malathion or any of the other ingredients of this medicine listed in Section 6 of the information leaflet.
  • Do not use on infants less than 6 months old unless your doctor tells you to.

Taking other medication

This product is unlikely to interact with other medication. However, please speak to your pharmacist or doctor if you are using any other medication for skin conditions.

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