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Derbac M Liquid - 150ml

Based on 55 reviews
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Faye Bonnell - Medical Content Writer
Faye Bonnell
Medical Content Writer
21/10/2024
20/10/2026
James O'Loan - CEO & Superintendent Pharmacist
James O'Loan
CEO & Superintendent Pharmacist
2084549

Buy Derbac M Liquid

Derbac M Liquid is a treatment for head lice, pubic lice, and their eggs, as well as scabies, in adults and children over six months old.

 

How Derbac M Liquid works

Derbac M Liquid contains the active ingredient malathion, a medicine that belongs to a class of drugs known as organophosphates. It works by paralysing and killing live lice and eggs.

 

Directions

Always use Derbac M Liquid exactly as described in the patient information leaflet or as your doctor / Chemist4U pharmacist has told you. 

To treat head lice, apply the product to dry hair and ensure no part of the scalp is left uncovered. Work into the hair and spread the liquid evenly from root to tip, leaving it to dry naturally in a warm but well-ventilated room. 

To treat pubic lice, apply Derbac M to the entire surface of the skin, paying attention to all hairy areas, including beards and moustaches. Avoid any other areas above the neck. Leave it on for at least an hour before washing it off, or preferably leave it on overnight. 

To treat scabies, apply Derbac M to the entire skin surface. For children under the age of 2, apply the liquid to the scalp, face and ears, avoiding the eyes and mouth. This may not be necessary for adults. Do not wash or bathe for 24 hours. If you need to wash your hands, reapply Derbac M immediately. Repeat the treatment after 7 days. 

 

Side effects

Like all medicines, Derbac M Liquid may cause side effects in some people, but these won’t affect everybody. There are no known reported side effects of this product.

If you experience any side effects, including any not included in the patient information leaflet, you can report them using the MHRA Yellow Card Scheme.

 

Serious side effects

Seek emergency medical attention if you notice any signs of a severe allergic reaction, symptoms of which include swelling of the face and throat, skin rash, breathing difficulties and/or loss of consciousness. 

 

Warnings

Derbac M Liquid may be unsuitable for certain people. Do not use this product if you are allergic to any of the ingredients.

Talk to your doctor or Chemist4U pharmacist before using this product if you have asthma.

If you have sensitive skin, test the product on a small area of skin before use. Do not use it more than once a week and for no more than three consecutive weeks.

This product may cause skin irritation or chemical burns.

 

Using/taking other medicines

If you are taking or have recently taken any medication, including medication obtained without a prescription, talk to your GP or pharmacist before using this product.

 

Age restrictions 

This product is not suitable for babies under 6 months old.

 

Pregnancy and breastfeeding

If you are pregnant or breastfeeding, think you may be pregnant or are planning to have a baby, you must ask your doctor or Chemist4U pharmacist for advice before using any new medicine. 

 

Storage information

Store below 25°C in a cool, dry place out of sight and reach of children. Do not use after the expiry date, referring to the last day of the month stated on the packaging. Do not throw away any medicines via wastewater or household waste.

 

Important information

This product is a medicine; make sure to speak to your doctor or Chemist4U pharmacist before using this product if you have an underlying medical problem or are taking any other medicine or complementary therapy. If your symptoms get worse or continue after using this product, contact us or your doctor. For medical services in your area, please refer to https://www.nhs.uk

 

If you are pregnant, trying to become pregnant, or breastfeeding, speak to your doctor or Chemist4U pharmacist before using this product. If you suffer from any allergies, ask your doctor or Chemist4U pharmacist if this medicine is right for you.

Store all medicines out of sight and reach of children.

Please read the included leaflet carefully before using this product.

Please contact your GP if appropriate regarding this product.

 

Derbac M Liquid - 150ml Reviews

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By Jacob Powell,
November 04, 2025
I had the unfortunate luck of catching scabies. My GP prescribed me Derbac but then I needed to buy some more so my partner could treat themselves. The bottle recommends two applications a week apart. However, I had luck doing three treatments, each four days apart. My logic was that this would catch any eggs before they had chance to mature. It worked very well, and Derbac is much kinder on your skin than permethrin. Just make sure you have lots of moisturiser to hand for the recovery phase!
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By Karen Sumser-Lupson,
October 14, 2025
Wonderful
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By Guest,
August 27, 2025
Easy to apply and effective.
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By diane wilkinson,
August 15, 2025
Easily applied.
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By Wtbonser,
August 13, 2025
haven’t needed to come across this before

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