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Full Marks Head Lice Solution Spray With Comb - 150ml

Full Marks Head Lice Solution Spray With Comb - 150ml

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  • ✔️ Kills head lice and eggs without pesticides or insecticides
  • ✔️ Silicone formula works in just 10 minutes on dry hair
  • ✔️ Includes detection comb for thorough lice removal
  • ✔️ Suitable for adults and children aged two years and over
  • ✔️ Pesticide-free — no risk of insecticide resistance

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What Is Full Marks Head Lice Treatment Spray?

 

Head lice are a common problem, particularly among school-age children, and they spread easily through close head-to-head contact. According to the NHS, head lice do not discriminate — they affect people of all hair types and lengths, and having them is no reflection of poor hygiene. If you have spotted the telltale signs of an itchy scalp or tiny eggs (nits) attached to hair shafts, a reliable head lice treatment spray is usually the first step towards clearing an infestation quickly. Full Marks Head Lice Solution Spray 150ml comes with a detection comb, making it a practical, all-in-one option you can use at home without a prescription.

Available from our head lice collection at Cured Pharmacy, this product is designed for use on dry hair and works without the use of traditional insecticides. That matters, because resistance to older pesticide-based treatments has been reported in some lice populations across the UK.

 

How Does Full Marks Head Lice Solution Spray Work?

 

Full Marks uses a physical mode of action rather than a chemical one. The active ingredients — cyclomethicone and isopropyl myristate — are silicone-based compounds that work by coating the louse's body and blocking its ability to regulate water loss. This causes the louse to dehydrate and die. Because the mechanism is physical rather than neurotoxic, lice cannot develop resistance to it in the way they can with some older insecticide treatments.

  • Cyclomethicone penetrates the louse's respiratory system and disrupts water balance
  • Isopropyl myristate dissolves the waxy outer layer of the louse's exoskeleton
  • Together, they also act on lice eggs (nits), reducing the likelihood of re-infestation
  • No pesticides are involved, so there is no risk of insecticide resistance

 

Who Should Use Full Marks Head Lice Solution Spray?

 

This product is suitable for most people who have a confirmed head lice infestation. It is particularly useful for families who want to avoid pesticide-based treatments, or where previous treatments have not worked. The NHS recommends treating all affected household members at the same time to prevent re-infestation.

  • Children aged 2 years and over (under medical supervision for children under 2)
  • Adults with an active head lice infestation
  • Those who have not responded to other treatments
  • People who prefer a pesticide-free approach

 

How Does Full Marks Compare to Other Head Lice Treatments?

 

Feature Full Marks Solution Spray 150ml Hedrin Once Spray Gel 150ml
Active ingredient Cyclomethicone & isopropyl myristate Dimeticone 4%
Mode of action Physical (suffocation & dehydration) Physical (suffocation)
Application time 10 minutes 15 minutes
Comb included Yes No
Pesticide-free Yes Yes

 

Is Full Marks Head Lice Solution Spray Suitable for All Hair Types?

 

Full Marks is formulated to work across a range of hair types and lengths. The spray format makes it easier to distribute evenly through thick or curly hair compared to some lotion-based alternatives. For longer or thicker hair, you may need to use more of the product to ensure full coverage — the 150ml bottle is generally sufficient for one to two full applications on most hair lengths.

If you are also managing other scalp conditions or looking for complementary hair care products, it is worth speaking to your pharmacist before combining treatments. Store the product below 25°C, away from direct sunlight and heat sources, and keep it out of reach of children when not in use.

This product is a medicine. Speak to your doctor or pharmacist before using if you have an underlying medical condition or are taking other medicines.

Full Marks Head Lice Solution Spray With Comb - 150ml specifications
Treatment category Head lice (pediculosis capitis)
Mechanism of action Physical — suffocation and dehydration of lice and eggs
Effective against Head lice (Pediculus humanus capitis) and eggs (nits)
Suitable for Adults and children aged 2 years and over
Active ingredients Cyclomethicone, isopropyl myristate
Pack size 150ml
UK classification General Sale List (GSL)
Drug class Pediculicide (physical action)
Preparation Topical solution spray
Route of administration Topical (applied to hair and scalp)

Specifications of Full Marks Head Lice Solution Spray With Comb - 150ml

 

What Is Full Marks Head Lice Solution Spray and What Is It Used For?

 

Full Marks Head Lice Solution Spray is an over-the-counter topical treatment used to eliminate head lice infestations in adults and children. It contains cyclomethicone and isopropyl myristate, which work together by physical means to kill both live lice and their eggs. It is not a pesticide, which means it is suitable for people who have previously used insecticide-based treatments without success. The NHS advises that head lice are only passed on by direct head-to-head contact, so treating all affected members of a household simultaneously is important to prevent re-infestation.

 

What Do You Need to Know Before Using Full Marks Head Lice Solution Spray?

 

Before using this product, read the following contraindications and warnings carefully:

  • Do not use on children under 2 years of age without medical advice
  • Avoid contact with eyes — if contact occurs, rinse thoroughly with water
  • Do not use near open flames or heat sources; the product is flammable
  • Do not use if you are allergic to any of the ingredients
  • If you have a broken or inflamed scalp, seek medical advice before use
  • Consult your GP or pharmacist if you are pregnant or breastfeeding before use

There are no known significant drug interactions associated with Full Marks Head Lice Solution Spray when used as directed. However, avoid using other topical scalp products at the same time without pharmacist guidance.

  • No known interactions with oral medicines
  • Do not combine with other head lice treatments simultaneously unless advised

 

How Should You Use Full Marks Head Lice Solution Spray?

 

Always use this product on dry hair. Wet hair dilutes the formula and reduces its effectiveness. Follow these steps carefully for the best results:

  1. Ensure hair is completely dry before starting
  2. Spray the solution directly onto the scalp and throughout the hair, working from root to tip
  3. Make sure all areas of the hair are thoroughly saturated, paying particular attention to the nape of the neck and behind the ears
  4. Leave the product on the hair for 10 minutes
  5. Use the included detection comb to comb through the hair section by section, removing dead lice and eggs
  6. Shampoo the hair thoroughly to remove the product
  7. Repeat the full treatment after 7 days to kill any lice that may have hatched from eggs since the first application
Indication Age Group Dose Frequency
Head lice infestation Adults & children aged 2+ Sufficient to saturate hair and scalp Two applications, 7 days apart
Head lice infestation Children under 2 Only under medical supervision As directed by a healthcare professional

If you are treating multiple family members, our baby and toddler range may also be helpful for younger children who need age-appropriate care products alongside treatment.

 

What Are the Possible Side Effects of Full Marks Head Lice Solution Spray?

 

Side effects with Full Marks are uncommon, but as with any topical product, some people may experience a reaction. Stop using the product and seek medical advice if you develop a severe skin reaction.

Common side effects:

  • Mild scalp irritation or tingling during application
  • Temporary skin redness at the application site

Less common side effects:

  • Dry or flaky scalp following use
  • Eye irritation if product accidentally contacts the eyes
  • Allergic skin reaction (rash, itching, or hives) — stop use immediately if this occurs

If you experience any signs of a serious allergic reaction — including swelling of the face, lips, or throat, or difficulty breathing — stop use immediately and call 999 or go to your nearest A&E.

 

How Should You Store Full Marks Head Lice Solution Spray?

 

Correct storage helps maintain the product's effectiveness and keeps your household safe. Follow these guidelines:

  • Store below 25°C in a cool, dry place
  • Keep away from direct sunlight and heat sources
  • Do not store near open flames — the product is flammable
  • Keep out of reach and sight of children
  • Do not use after the expiry date printed on the packaging
  • Do not dispose of via household drains — take unused product to your local pharmacy for safe disposal

For other scalp and skin concerns, you may also find useful products in our skin care collection, which includes a range of topical treatments for common conditions.

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Your safety and success are our highest priorities. Our medical team rigorously evaluates every product and piece of advice we provide, ensuring you receive only the most effective, science-backed solutions available.

Frequently Asked Questions

Where can I buy Full Marks Head Lice Solution Spray online in the UK?

You can buy Full Marks Head Lice Solution Spray 150ml directly from Cured Pharmacy, a GPhC-registered UK online pharmacy. It is available without a prescription as an over-the-counter treatment. You can also browse our full head lice collection for other treatment options.

How does Full Marks Head Lice Solution Spray work in the body?

Full Marks does not work systemically — it acts entirely on the surface of the hair and scalp. The silicone-based ingredients cyclomethicone and isopropyl myristate coat the louse's body, blocking its ability to regulate water loss and causing it to dehydrate and die. Because this is a physical rather than chemical process, lice cannot develop resistance to it.

How do I use Full Marks Head Lice Solution Spray step by step?

Apply the spray to completely dry hair, saturating from root to tip and paying close attention to the nape of the neck and behind the ears. Leave on for 10 minutes, then comb through with the included detection comb before shampooing off. Repeat the full process after 7 days to catch any lice that have hatched from eggs since the first treatment.

How long does Full Marks Head Lice Spray take to work?

The spray needs to be left on the hair for a minimum of 10 minutes to be effective against live lice. A second application 7 days later is essential to eliminate any newly hatched lice, as no treatment can guarantee 100% destruction of all eggs in a single application. Following both steps gives you the best chance of clearing the infestation completely.

Is Full Marks Head Lice Spray safe for children?

Full Marks is suitable for children aged 2 years and over when used as directed. Children under 2 should only be treated under the supervision of a healthcare professional. Always keep the spray away from children's eyes and mouth during application, and ensure an adult applies the product to younger children.

Can I use Full Marks Head Lice Spray if I am pregnant or breastfeeding?

If you are pregnant or breastfeeding, it is advisable to speak to your GP or pharmacist before using Full Marks Head Lice Solution Spray. While the product works by physical action and does not contain traditional pesticides, professional guidance is always recommended during pregnancy and breastfeeding. Your pharmacist can help you weigh up the options and choose the most appropriate treatment.

What are the side effects of Full Marks Head Lice Solution Spray?

Side effects are uncommon but may include mild scalp irritation, temporary skin redness, or dryness at the application site. If the product accidentally contacts the eyes, rinse thoroughly with water. Stop use immediately and seek medical advice if you develop signs of an allergic reaction such as a rash, swelling, or difficulty breathing.

What happens if I only do one treatment and skip the second application?

Skipping the second treatment significantly increases the risk of re-infestation. Head lice eggs (nits) are harder to kill than live lice, and any eggs that survive the first application may hatch within 7–10 days. The second application 7 days after the first is specifically timed to kill these newly hatched lice before they can lay new eggs.

What are the alternatives to Full Marks Head Lice Spray?

Alternatives include dimeticone-based products such as Hedrin 4% Lotion and Hedrin Once Spray Gel, which also work by physical action. The NHS also recommends wet combing — using a fine-toothed detection comb with conditioner on wet hair — as a pesticide-free method. You can explore other options in our head lice treatment range.

Does Full Marks Head Lice Spray kill eggs as well as live lice?

Full Marks is effective against both live lice and eggs (nits), though no single treatment guarantees complete destruction of all eggs. This is why a second application after 7 days is always recommended. Using the included detection comb after each treatment helps to physically remove dead lice and loosened eggs from the hair shaft.

How long can you keep using Full Marks Head Lice Spray?

Full Marks is intended for use as a two-application course — once on the day of diagnosis and again 7 days later. If lice are still present after completing both applications, consult your pharmacist before repeating the course. Prolonged or repeated use beyond the recommended course should only be done on professional advice.

Can Full Marks Head Lice Spray be used on colour-treated or chemically processed hair?

There is no specific evidence that Full Marks damages colour-treated or chemically processed hair, but if you have concerns, speak to your pharmacist or hairdresser before use. The silicone-based formula is generally considered gentle, but individual hair types and treatments vary. Always perform a small patch test if you are unsure about any topical product on treated hair.

Do I need to treat everyone in the household at the same time?

The NHS recommends checking all household members for head lice and treating anyone who has a confirmed infestation at the same time. Treating only one person while others remain infested will almost certainly lead to re-infestation. Close contacts such as classmates or friends should also be informed so they can check and treat if necessary.

Is Full Marks Head Lice Spray a pesticide-free treatment?

Yes — Full Marks does not contain any traditional insecticides or neurotoxic pesticides. It works entirely by physical means, using silicone-based ingredients to suffocate and dehydrate lice. This makes it a suitable option for families who prefer to avoid pesticide-based treatments or where resistance to older insecticide products has been a concern.

What are the latest findings on silicone-based head lice treatments like Full Marks?

Research published in clinical literature supports the effectiveness of silicone-based treatments such as cyclomethicone and isopropyl myristate against head lice, particularly given the growing evidence of resistance to traditional insecticide treatments in the UK. The NHS and BNF both recognise physical-action treatments as a first-line option for head lice management. These products continue to be widely recommended by pharmacists and healthcare professionals across the UK.

How Should You Use Full Marks Head Lice Solution Spray?

Always apply Full Marks Head Lice Solution Spray to completely dry hair — applying it to wet hair will dilute the formula and reduce its effectiveness. Make sure you work in a well-ventilated area and keep the spray away from the eyes and mouth throughout the process.

What Is the Correct Dose of Full Marks Head Lice Solution Spray?

There is no fixed measured dose for this product — you should use enough spray to fully saturate the hair and scalp. For longer or thicker hair, you may need to use more of the product to ensure complete coverage. The 150ml bottle is generally sufficient for one to two full applications depending on hair length and thickness.

When Is the Best Time to Use Full Marks Head Lice Solution Spray?

There is no specific time of day required for this treatment, but many people find it easiest to apply in the evening when there is more time to complete the full process without rushing. Applying the spray before a bath or shower makes the rinse-off step straightforward. Whichever time you choose, ensure the hair is fully dry before you begin.

It is also worth timing the second application carefully — mark the date 7 days after your first treatment so you do not miss it. Consistency between the two applications is key to breaking the lice lifecycle effectively.

How Long Can You Use Full Marks Head Lice Solution Spray For?

Full Marks is designed as a two-application course: one treatment on the day of diagnosis and a second treatment exactly 7 days later. This two-step approach is specifically designed to kill any lice that hatch from eggs after the first application. If lice are still present after completing both applications, do not simply repeat the course without first speaking to your pharmacist, as they can advise on whether a different treatment approach is needed.

Routine preventative use is not recommended. The product should only be used when a confirmed infestation is present. Regular wet combing with a detection comb is a better approach for ongoing monitoring.

Do not exceed the recommended dose. If in doubt, speak to your pharmacist.

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What Are the Most Common Side Effects of Full Marks Head Lice Solution Spray?

Full Marks Head Lice Solution Spray is generally well tolerated. Because it works by physical rather than chemical action, it tends to cause fewer side effects than older insecticide-based treatments. That said, as with any topical product applied to the scalp, some people may notice mild reactions.

  • Mild scalp tingling or irritation during or shortly after application
  • Temporary redness or warmth at the application site
  • Slight greasiness or heaviness of the hair immediately after use

These effects are usually short-lived and resolve once the product is shampooed out. They do not typically require any treatment.

What Are the Less Common Side Effects of Full Marks Head Lice Solution Spray?

Less commonly, some individuals may experience more noticeable reactions, particularly those with sensitive skin or a history of scalp conditions. If any of the following persist or worsen, stop using the product and seek advice from your pharmacist.

  • Dry or flaky scalp following use
  • Itching that worsens rather than improves after treatment
  • Eye irritation if the spray accidentally contacts the eyes — rinse immediately with plenty of water
  • Skin rash or hives on the scalp, neck, or forehead

What Are the Serious Side Effects of Full Marks Head Lice Solution Spray?

Serious side effects are rare but can occur. A severe allergic reaction (anaphylaxis) is uncommon but possible with any topical product. You should be aware of the signs and act quickly if they occur.

Stop using Full Marks immediately and call 999 or go to your nearest A&E if you experience any of the following:

  • Swelling of the face, lips, tongue, or throat
  • Difficulty breathing or swallowing
  • Sudden widespread skin rash or severe hives
  • Dizziness or feeling faint

What Should You Do If You Experience Side Effects of Full Marks?

For mild side effects such as scalp irritation or redness, simply rinse the product off with water and shampoo. Avoid scratching the scalp, as this can worsen irritation and increase the risk of secondary skin infection. If symptoms do not settle within 24 hours of rinsing, contact your pharmacist for advice.

You can also report suspected side effects from any medicine or medical device to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk. This helps the MHRA monitor the safety of products available in the UK.

Can Full Marks Head Lice Solution Spray Interact With Other Medicines?

No significant drug interactions have been identified for Full Marks Head Lice Solution Spray when used as directed. The product is applied topically and is not absorbed into the bloodstream in meaningful amounts, so interactions with oral medicines are not expected. However, avoid using other topical scalp treatments at the same time unless your pharmacist has confirmed it is safe to do so. If you are using any prescription scalp treatments, always check with your GP or pharmacist before adding any over-the-counter product.

If you are concerned about any side effects, contact your pharmacist or GP immediately.

Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Written and reviewed by our qualified team

GPhC Number: 2233073
Tarun Kumar

Reviewed by:

Tarun Kumar

Superintendent/ Clinical Lead

📖 Find out more about our team of medical content authors and how we ensure the accuracy of our content with our content guidelines.

Content last updated: 31 Mar 2025

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