Derbac M Liquid 50ml

  • Can be used from 6 months old.
  • Suitable for those with asthma.
  • Can be used for pubic lice and scabies also.
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Malathion 0.5% w/w.

Also contains methylhydroxybenzoate (E218) and propylhydroxybenzoate (E216).


Eradication of head lice, pubic lice and their eggs.

Treatment of scabies.


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

As this product does not contain alcohol, it may be more suitable for those with asthma or eczema.

Treatment of head lice:

Rub the liquid into the scalp until all the hair and scalp is thoroughly moistened.

Leave the hair to dry naturally in a warm but well ventilated room.

After 12 hours, or the next day if preferred, shampoo the hair in the normal way.

Rinse the hair and comb whilst wet to remove dead lice and eggs (nits) using the Derbac Nit Comb.

Treatment should be repeated after 7 days.

Treatment of crab (pubic) lice:

Apply Derbac-M Liquid 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 one hour before washing but preferably Derbac-M Liquid should be left on overnight.

Wash off in the usual manner.

Treatment should be repeated after 7 days.

Treatment of scabies:

Apply Derbac-M Liquid to the entire skin surface.

In adults it may not be necessary to apply above the neck but children under the age of 2 years should have a thin film of Derbac-M Liquid applied 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, the treatment must be reapplied to those areas immediately.

Treatment should be repeated after 7 days.

No special sterilisation of clothing is necessary, ordinary laundering or dry-cleaning with hot-iron pressing are sufficient.

The infestation is cleared by the treatment. However, the itching and rash may persist for up to 7 days. An anti-irritant cream, such as Eurax, can be applied if necessary.

Family members and close contacts should also be treated simultaneously.


  • Children under 6 months, use only under medical supervision only. 
  • Avoid contact with the eyes.
  •  For external use only. 
  • Do not use on broken or secondarily infected skin. 
  • Keep out of the reach of children. 
  • If inadvertently swallowed, a doctor or casualty department should be contacted at once.
  • Continued prolonged treatment with this product should be avoided.
  • It should be used not more than once a week and for not more than 3 consecutive weeks. 
  • There are no known effects in pregnancy and lactation. However, as with all medicines, use with caution.


Head Lice.


This information is provided for your reference only and it is not to be relied upon on its own as instructions for use of this medication. It is not a replacement for and should only be used in conjunction with full consultation with a licensed healthcare professional, the information provided by your pharmacist and the manufacturer of the medication. It may not contain all the available information you require and cannot substitute professional medical care, nor does it take into account all individual circumstances. Other than liability for death or personal injury arising out of our negligence, we shall not be held responsible or liable for any claims or damages arising from the use or misuse of the information contained herein, its contents or omissions, or otherwise.

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