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hedrin lotion 4% 50ml
  • Kills head lice; repeat after 7 days
  • Suitable for 6 months+
  • Safe in asthma and pregnancy
  • Odourless and easy to use
  • Works on insecticide-resistant lice

Hedrin Lotion 4%

£6.1950ml lotionincluding the pharmacist review
Pack size
  1. You answer a few questions.Two to three minutes, no appointment.
  2. A pharmacist reviews your answers.The same day for orders before 3pm.
  3. We dispense and post it.In plain packaging.

Order in the next

16h 8m 48s

10th October 2026

Works
Physical actionCoats lice and disrupts water balance
Applied
Leave 8 hoursRepeat after 7 days
Suitable for
Age 6 months+Head lice
Form
Lotion
From
£6.19
Dispatched
Same dayon working days before 3pm
HOW IT WORKS
Physically coats head lice and disrupts their water balance
WARNING
Flammable; keep away from flames while in the hair
PHARMACY
Pharmacy medicine, sold after consultation

What Is Hedrin 4% Lotion?

Hedrin 4% Lotion is a treatment for head lice. It contains dimeticone, a silicone-based ingredient that physically coats lice and disrupts their water balance, rather than using traditional pesticides. This makes it a great option for children and adults, even for those with sensitive skin or asthma.

Unlike some treatments that use harsh chemicals, Hedrin 4% Lotion is gentle, odourless, and easy to use. It is suitable for adults and children aged 6 months and over.

How Does Hedrin 4% Lotion Work?

Hedrin works by coating head lice in a physical layer of dimeticone, which blocks their ability to regulate water. This causes the lice to die without needing toxic insecticides. Since it doesn't rely on chemical poisons, its activity is not reduced by resistance to insecticides.

How to Use Hedrin 4% Lotion

Follow these steps for best results:

  • Apply the lotion evenly over dry hair, covering the scalp and all strands.
  • Work the lotion into the hair using your fingers or a comb.
  • Let the hair dry naturally. Do not use a hairdryer. Leave on for at least 8 hours or overnight.
  • Wash out thoroughly with shampoo (do not use conditioner first).
  • Repeat treatment after 7 days to kill any newly hatched lice.

Always read the instructions provided in the packaging before use.

Fire risk: keep treated hair away from cigarettes, naked flames and other ignition sources until the product has been washed out. Do not use a hairdryer on treated hair.

How Many Bottles of Hedrin 4% Lotion Will I Need?

The number of bottles you'll need depends on the length and thickness of the hair being treated. As a general guide:

  • Short hair: One 50ml bottle is usually enough for one application; the second application needs more lotion.
  • Shoulder-length hair: You may need up to 100ml per application.
  • Long or thick hair: You may require more than 100ml, or multiple bottles, to ensure full coverage.

Remember, a second treatment is needed after 7 days, so you may want to purchase enough for two full applications per person. It's always better to have a little extra to make sure every part of the scalp and hair is fully treated.

These quantities are approximate shopping estimates, not a measured dose. Use enough to cover all the hair and scalp, and allow for both applications seven days apart.

Who Can Use Hedrin Lotion?

Hedrin 4% Lotion is suitable for adults and children aged 6 months and over. It is safe to use in people with asthma and those with sensitive skin. It can also be used during pregnancy and breastfeeding.

Side Effects & Precautions

Hedrin is generally very well tolerated. Side effects are rare but may include:

  • Itching or irritation of the scalp
  • Flaking or dryness (mild and temporary)

If you notice any severe irritation or allergic reaction, stop using the product and speak to a healthcare professional.

Frequently Asked Questions

  • What is Hedrin 4% Lotion used for?

    It treats head lice by physical action. Complete both applications seven days apart, as the first application may not kill every egg.

  • Is Hedrin safe for children?

    Yes, Hedrin 4% Lotion is suitable for children aged 6 months and over, including those with asthma or sensitive skin.

  • How long should I leave Hedrin on?

    Hedrin should be left on the hair for at least 8 hours or overnight before washing out with shampoo.

  • Does Hedrin kill lice eggs?

    Hedrin 4% Lotion is less effective against eggs than against lice. A second application after seven days is required to kill lice that hatch after the first treatment.

  • Can I use Hedrin if I'm pregnant?

    Yes, Hedrin 4% Lotion is considered safe for use during pregnancy and breastfeeding.

Sources and further information

Reviews describe individual experiences of our pharmacy service and are not a guide to how a medicine will work for you. Reviews are collected and verified by Priorly and are published unedited. Suspected side effects should be reported through the MHRA Yellow Card scheme.

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