Hedrin Once


Available size:

60 ml 100 ml

Price £7.49

In stock


- +

Delivery Time


Expected delivery date:

Wednesday, 13 December 2023

If you order within:


Next Day Delivery

Next Day

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UK Registered Pharmacy

UK Registered

Discreet & Confidential

Discreet &

  • Overview
  • FAQ
  • Side Effects
  • Patient Information Leaflet
  • Reviews

What is Hedrin Once

Hedrin Once Spray Gel is a fast-acting solution for lice eggs and head lice. It contains dimeticone as an active ingredient which seals in the lice that is attached to the hair shaft, thus preventing movement. Owing to hunger the lice die in place. Penetrol is also another ingredient which helps the lice eggs penetrate.

How long do I take Hedrin Once spray gel for before I notice a difference? 

Hedrin Once Spray Gel is a fast-acting treatment against head lice. It contains an active ingredient known as dimeticone, which is a type of silicone that works by smothering the lice and thus killing them. Hedrin Once Spray Gel work in 15 minutes all because of the ingredient Penetrol that aids the product in penetrating the lice eggs and hence preventing further reproduction.

What dose should I choose?

Hedrin Once Spray Gel comes in a 100ml spray bottle as a medication designed to kill lice and eggs within 15 minutes of application. It is a new formula and clinically proven to provide relief due to the ingredients, such as dimeticone and Penetrol, which help eradicate the lice and eggs with one application. The medication can be used as often as needed without the lice developing a resistant to it. 

How Effective Is Hedrin Once Spray Gel?

Hedrin Once Spray Gel is a new formula and is clinically proven to kill lice and lice eggs within a one 15 minute application. The gel comes in a spray bottle to help you get the product in any hard to reach area. The treatment is designed for children over six months and adults, and it can be reapplied as required without lice developing a resistance to it.

Can I buy Hedrin Once spray gel online? 

Hedrin Once Spray Gel does not require a prescription, although you are very welcome to book an appointment with a health expert at Click Pharmacy to discuss how best to use this product. Each bottle of Hedrin Once sprays gel contains 100ml of product, and it can be purchased online in a 1, 2 or 3-month pack to be sent directly to you by Next Day Delivery.

How should I take Hedrin Once spray gel?

With a towel or any rug placed under your shoulders, hold the spray bottle containing Hedrin Once Spray gel 10 cm away from you.

Ensuring that you do not inhale the gel or spray on your eyes, carefully spray the gel onto dry hair. Coat each strand of hair and scalp generously. Your hair should be saturated with the gel.

Work the product into your hair, ensuring that you coat each hair shaft from root to tip. Use your fingers or an ordinary tooth comb to distribute the gel on your hair. 

Leave the gel for 15 minutes or longer if convenient, then prepare to wash it off.

Hedrin Once Spray Gel contains an anti-foam ingredient, which makes it harder for shampoo to lather. Therefore, wash as follows;

Start by applying shampoo on dry hair. Work it then wash thoroughly rinse the shampoo off. Repeat the process and apply the conditioner. Rinse and dry the hair with a towel or any cloth. 

Always remember to apply shampoo on dry hair instead of wet hair. 

Treat all family members who’ve been infested with the lice on the same day. 

How does Hedrin Once Spray Gel work? 

Hedrin Once Spray is a gel that comes in a spray format to help you get the medication on the affected areas generously. The treatment works by smothering the lice, which attach themselves on the hair shaft, making it difficult to kill them by use of water only. After 15 minutes upon application, you can wash your hair with shampoo, rinse and condition as desired.

This medication can be reused as often as needed without the lice becoming resistant to it. 

It is for external use only, and it should not be applied to infants under six months. 

What are the side effects of Hedrin Once Spray Gel?

Like other lice treatments, the main side effect of Hedrin Once Spray Gel may be flaking of the scalp, itching or irritation around the eyes. 

Side effects may vary from patient to patient hence speak to your doctor or consult our specialists at Click Pharmacy should you require any further advice. Also, should you notice any other side effects that are not mentioned on the medication, seek immediate medical attention from your GP or hospital.

When shouldn’t I take Hedrin Once spray gel?

Do not begin this treatment if you are allergic to dimeticone or any other ingredient listed on the product. In case a skin rash or any other signs of an allergic reaction occur, stop using the medication, wash it off with soap and water and seek medical assistance. Do so also if you experience any other side effects that are not mentioned on the patient leaflet enclosed. It is always advisable to consult your doctor in case you are pregnant or breastfeeding, and yet you need to use the medication. 

Do not apply this medication on broken skin or on children under six months. 

What is the difference between Hedrin Once Spray Gel and Hedrin lotion/Hedrin Liquid Gel?

The active ingredient in all of the above medications is dimeticone. However, while Hedrin Once Spray Gel and Hedrin Liquid Gel are fast-acting reliefs for head lice, Hedrin Lotion takes an overnight first and second application for the treatment to be effective.  

Hedrin Once Spray Gel also contains an ingredient known as Penetrol, which is responsible for shortening the amount of time it takes for the treatment to work by killing the lice eggs. Hedrin, once sprays gel, comes in a spray format.

Can I reuse Hedrin Once Spray Gel?

Yes, it is safe to reuse Hedrin Once Spray Gel a few days after application, although this is not necessary.

Like all medicines used for the treatment of head lice, you are likely to experience side effects from using Hedrin Once Spray Gel. common side effects include the following:

  • Flaky scalp
  • Itching scalp
  • Irritation
  • Heat like feeling
  • Burning like sensation

If any of these side effects worsen you should stop using Hedrin Once Spray Gel and seek medical advice as soon as possible.

Always read the patient information leaflet before starting your treatment. The patient information can be found here.

Authored by

Last reviewed 11 April 2023

Superintendent Pharmacist GPhC No.2220953

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