Free Delivery Over £30
Discreet Delivery Always
Regulated Pharmacy
  • Home
  • Derbac M Liquid, 50ml
Derbac M Liquid, 50ml_30

Derbac M Liquid, 50ml

Availability: In stock

£4.99 RRP £5.99
add to basket
in stock
Free Delivery
Over £30
Discreet Delivery
Derbac M Liquid treats head lice, pubic lice and scabies. The active ingredient, malathion, is an insecticide which is highly effective against lice and their eggs. Derbac M Liquid is suitable for adults, the elderly, and children aged 6 months and over.
 To Buy This Product You Must Answer the Below Questions

Pharmacy medicines are sold at the professional discretion of our pharmacist. Please answer the following questions accurately to allow our pharmacist to check that this product is suitable for the intended user(s). All information provided will be treated confidentially and will only be available to pharmacy staff processing your order.

Important: Our pharmacists only have access to the details you provide in this form. They don't have access to patient information provided online on previous occasions. If your previous responses are shown below, please check that your answers are still correct.

Pharmacy Badge

GPhC Registered Premises: 1103628 * Answer Required

* Answer Required
  • no-option-u.png
  • yes-option.png

(Please describe typical symptoms even if you are not currently suffering from them)

* Required Fields

£4.99 RRP £5.99
Warning Maximum Product Quantity of 3

Derbac M Liquid, 50ml


What is Derbac M?

Derbac M is a treatment for head lice and nits which can also be used to treat pubic lice and scabies. It can be used by anyone over the age of 6 months old, making it ideal for all the family. Derbac M does not contain alcohol, which may make it more suitable for those who suffer with asthma or eczema.


What are headlice and nits?

Head lice and their eggs (which are also known as nits) are a common problem that often affects young children. Head lice are tiny insects which cling to the hair, where they lay their eggs. If you have head lice, your scalp may feel itchy and you may be able to feel something moving in your hair. You may also be able to see the lice and nits in your hair.


How does Derbac M treat head lice or nits?

Derbac M uses the active ingredient malathion, which kills head lice, nits, pubic lice and scabies mites. It blocks a natural enzyme in the nit or mite, stopping it from growing and leading to their death.


How to use Derbac M to treat head lice.

If you are treating head lice, apply enough Derbac M liquid to dry hair that no part of the scalp is left uncovered. Work the liquid into the hair with your fingers, making sure it is spread evenly from root to tip. Leave hair to dry naturally in a warm, well ventilated room. After 12 hours, shampoo the hair as you usually would, then rinse the hair and comb with a nit comb while wet. This should remove head lice and nits. Repeat treatment after 7 days if necessary.

For information about how to treat scabies or pubic lice using Derbac M, please see the patient information leaflet.


When should Derbac M not be used?

Derbac M is not suitable for use on children under the age of 6 months. Use Derbac M only on your skin and avoid getting into contact with eyes. Do not use this product on broken or infected skin. If you have asthma, speak to your doctor or Chemist 4 U pharmacist before using this product. Do not use Derbac M if you are allergic to Malathion or any of the other listed ingredients.

Like any medication, Derbac M can have side effects, although not everyone will ger them. These side effects include:

  • Skin irritation.
  • Severe allergic reactions (including difficulty breathing, dizziness, swelling of face, throat and eyes).
  • Chemical burns.

If you experience these or any other side effects, stop using Derbac M and speak to your doctor or Chemist 4 U pharmacist immediately.


Important Information.

This product is a medicine; make sure to speak to your doctor or Chemist-4-U pharmacist before taking 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 taking this product, contact us or your doctor. For medical services in your area, please refer to

If you are pregnant, trying to become pregnant, or breastfeeding, speak to your doctor or our pharmacist before taking this product. If you suffer from any allergies, ask your doctor or our 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.

For Head Lice: Shake the bottle. Apply sufficient LIQUID to dry your hair to ensure that no part of the scalp is left uncovered. Work into the hair spreading the LIQUID evenly from the roots to the tips. Allow the hair to dry naturally in a ventilated room. You should make sure that you carefully read all product packaging and labels prior to use.
Active ingredient: Malathion .5% w/w. Also contains Preservatives Methylhyroxybenzoate (218) and Propylhydroxybenzoate (216), Emlsifying Wax, Potassium Citrate Acid, Perfume HT52, Purified Water.
Keep out of the reach and sight of children. For external use only. Prolonged and repeated use should be avoided. It should not be used more than once a eek and for not more than three consecutive weeks. Protect eyes at all times by covering the eye area with a towel. If liquid enters the eyes rinse thoroughly with water. If there is persistent irritation seeks medical advice.

Shipping Costs

Free UK Delivery on all orders over £30 - Tracked 48

Standard UK Delivery - £2.95 - Tracked 48

Next Working Day Delivery (UK Mainland) - £4.99 - Tracked 24

Please Note: These prices are shown as a guide only. All delivery times are approximate but have been obtained in good faith.


Discreet Delivery

All our items are sent completely discreet for your peace of mind.

This means the packaging is plain, there is no mention of what product is inside your package and there is no mention of Chemist 4 U either.

We respect that many of our products are of a sensitive nature - this is why we take every step to keep your purchases private.