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Derbac-M Liquid 200ml

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Derbac-M Liquid 200ml

Derbac M Liquid is used for the eradication of head lice, pubic lice, and their eggs and also treats scabies.
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Derbac M Liquid is used for the eradication of head lice, pubic lice, and their eggs and also treats scabies. Malathion has been used to treat head lice since the 1960's. It acts by disrupting the metabolic processes of the lice and killing them. It is suitable for children from the age of 6 months as well as sufferers of asthma and those with sensitive skin.


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Active ingredient: Malathion 0.5% w/w Derbac-M Liquid also contains the following inactive ingredients: Methyl Hydroxybenzoate, Propyl Hydroxybenzoate, Lanette Wax SX, Potassium Citrate, Citric Acid, Perfume HT 52, Water.


Treatment of Head Lice: Apply sufficient Derbac-M liquid to dry hair to ensure that no part of the scalp is left uncovered. Work Derbac-M into the hair spreading the liquid from the roots to the tips. 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 whilst wet to remove dead lice and eggs (nits). 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 way. Treatment of Scabies: Apply Derbac-M Liquid to the entire skin surface. In adults it may not be necessary to apply Derbac-M Liquid 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 Derbac-M Liquid off, or bathe for 24 hours. If hands or any other parts must be washed during this period, the Derbac-M Liquid treatment must be reapplied to those areas immediately. Family members and close contacts should also be treated with Derbac-M Liquid simultaneously.


Not to be used on infants less than 6 months except on medical advice. Avoid contact with the eyes. Keep out of the reach of children. 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.

Delivery & Returns

Standard Delivery

Standard UK delivery is £3.49* 

We aim to deliver orders within 3-5 working days to the shipping address provided by you in your order if the shipping address is in the UK.  For orders being delivered outside mainland UK, this will be longer and we cannot give a guaranteed delivery time due to the differences between carriers. Delivery timescales are estimates only. If you do not receive your order within 14 days of us confirming your order has been sent you must notify us and we will investigate the non-delivery provided. Orders from outside the UK have varied delivery charges, depending on the particular country.  Please note that in some instances you may be required to answer product related questions from our Pharmacist as part of the checkout process.  Failiure to answer these will cause delays.  Please allow extra time for Pharmacy approved products.  Please note that Bank Holidays do not count as working days.

Delivery charges for orders outside the UK will vary. *Northern Ireland delivery charges different

Express UK Delivery

Express UK delivery is £6.95*

Please note that Express delivery is only available on orders placed before 1pm (GMT) Monday to Friday in the UK.  After 1pm we cannot guarantee express delivery, even if it has been selected.  Please note that this is not a guaranteed next day service, but is an expedited delivery option.  Products which need to be approved by a pharmacist are not suitable for express delivery.

*Northern Ireland delivery charges different

Free Delivery on orders over £40*

This applies to orders delivered to UK addresses only.  *Exclusions may apply.


We hope you will be happy with any items you’ve ordered from us, but if you’re not entirely satisfied, you’ll find details of our returns policy on the link below.

Delivery outside of the EU

Please note that certain medicines and medical devices sold on this website cannot be purchased if you live outside of the European Union.


Please visit our Delivery & Returns page for more information.