What is Derbac M Liquid 150ml – Scabies Treatment?

Derbac M Liquid is a topical treatment used to manage scabies. It contains permethrin, an effective insecticide that kills the mites responsible for scabies and helps stop the spread of the condition.

How Does It Work?

Permethrin targets the nervous system of the scabies mites, killing them and their eggs. When applied over the whole body, it clears the infestation and prevents re-infestation when used correctly.

When to Consider Derbac M Liquid

You should consider treatment with Derbac M Liquid if you have been diagnosed with scabies, or if close contacts such as family members or partners are affected. Early treatment reduces the risk of spreading scabies to others.

Who Should Use It

Adults and children over 2 months old (under medical advice for infants).
People who have confirmed scabies or have been in close contact with someone diagnosed with scabies.
Those advised by a healthcare professional after diagnosis.

Who Should Not Use It

Infants under 2 months unless directed by a doctor.
Anyone allergic to permethrin or any other ingredient in the product.
People with widespread skin conditions (eczema, psoriasis) should seek medical advice before use.
Pregnant or breastfeeding women should consult a doctor first.

Alternative Treatments

Other treatment options for scabies include:

Lyclear Dermal Cream (permethrin cream)
Benzyl benzoate lotion (less commonly used)
Oral ivermectin (available on prescription for resistant cases or when topical treatment is unsuitable)

Can You Buy Derbac M Liquid Over the Counter?

Yes, Derbac M Liquid is available as a pharmacy medicine in the UK. This means you can buy it without a prescription, but a pharmacist will check it is suitable for you before sale.

Directions for Use

1. Ensure skin is clean, cool, and dry before application.
2. Apply the liquid over the whole body from the neck down, including arms, legs, feet, soles, between fingers and toes, and under nails.
3. In infants and young children, apply to the scalp, face, ears, and neck, avoiding the eyes and mouth.
4. Leave the treatment on for 8–12 hours, then wash off thoroughly with soap and water.
5. Reapply to any areas (such as hands) that are washed during the treatment period.
6. Repeat the application after 7 days to ensure complete eradication.
7. All household members and close contacts should be treated at the same time, even if they do not have symptoms.
8. Wash all bedding, clothing, and towels used in the past few days at 50°C or higher. Items that cannot be washed should be sealed in a bag for at least 72 hours.

Active Ingredient

Permethrin 0.5% w/w

Inactive Ingredients

Industrial methylated spirits
Terpineol
Pine oil
Titanium dioxide
Hypromellose
Purified water

Always check the patient information leaflet (PIL) in your pack for the full ingredient list — especially if you have skin allergies or sensitivities.

Common side effects

Mild burning, stinging, or itching after application
Temporary redness of the skin
Tingling or numbness where applied

Less common side effects

Rash or dry skin
Irritation of the eyes if contact occurs
Flaking or peeling of the skin

Rare side effects

Allergic reaction such as swelling, severe itching, or difficulty breathing (seek medical help immediately)

Most side effects are mild and temporary. Itching can continue for up to 2–3 weeks after treatment, even if the scabies mites are killed. This does not always mean the treatment has failed.