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Dermax Therapeutic Shampoo 250ml

Dermax Therapeutic Shampoo 250ml

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  • ✔️ Contains selenium sulphide 2.5% to target dandruff at source
  • ✔️ Reduces Malassezia yeast growth linked to seborrhoeic dermatitis
  • ✔️ Slows scalp cell turnover to visibly reduce flaking
  • ✔️ Suitable for adults and children over five years
  • ✔️ 250ml bottle provides multiple weeks of treatment

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What Is Dermax Therapeutic Shampoo and How Does It Help?

 

If you've been dealing with persistent flaking, an itchy scalp, or the tell-tale signs of seborrhoeic dermatitis, you're not alone. These conditions are incredibly common in the UK, and finding something that actually works can feel like a long road. Dermax therapeutic shampoo is a medicated scalp treatment containing selenium sulphide 2.5%, a clinically recognised active ingredient used to tackle dandruff and seborrhoeic dermatitis at the source. Available from our hair care collection at Cured Pharmacy for just £9.79, it's an accessible, pharmacy-grade option you can use at home.

Dandruff affects up to half of the adult population at some point in their lives, according to NHS guidance. It's not a sign of poor hygiene — it's a skin condition, and it often needs a targeted treatment rather than a standard cosmetic shampoo. Dermax Therapeutic Shampoo 250ml is designed specifically for that purpose.

 

How Does Dermax Therapeutic Shampoo Work on the Scalp?

 

The active ingredient, selenium sulphide 2.5%, works through two main mechanisms. It's both antifungal and cytostatic — meaning it slows down the excessive skin cell turnover that causes visible flaking, while also targeting the Malassezia yeast species that plays a key role in seborrhoeic dermatitis.

  • Reduces the rate at which scalp skin cells shed, minimising flaking
  • Inhibits the growth of Malassezia yeast, a known trigger for dandruff and seborrhoeic dermatitis
  • Helps restore a more balanced scalp environment with regular use
  • Provides relief from itching and irritation associated with these conditions

It's worth noting that selenium sulphide works best when left on the scalp for a few minutes before rinsing — giving the active ingredient time to do its job properly.

 

Who Should Use Dermax Therapeutic Shampoo?

 

This shampoo is suitable for adults and children over five years of age who are experiencing scalp conditions that haven't responded to standard cosmetic anti-dandruff shampoos. It's particularly useful if your dandruff is persistent, recurring, or accompanied by redness and scaling that suggests seborrhoeic dermatitis.

  • Adults with moderate to severe dandruff
  • People diagnosed with seborrhoeic dermatitis of the scalp
  • Those whose symptoms haven't improved with regular anti-dandruff shampoos
  • Children over five years, under adult supervision

It is not suitable for use on broken, inflamed, or infected skin. If you're unsure whether this product is right for you, speak to your pharmacist before purchasing.

 

How Does Dermax Therapeutic Shampoo Compare to Other Medicated Shampoos?

 

Feature Dermax Therapeutic Shampoo Ketoconazole Shampoo (e.g. Nizoral)
Active ingredient Selenium sulphide 2.5% Ketoconazole 2%
Primary action Antifungal + cytostatic Antifungal
Suitable for dandruff Yes Yes
Suitable for seborrhoeic dermatitis Yes Yes
OTC availability in UK Yes Yes (1% strength)
Price (250ml) £9.79 Typically £7–£12

 

Is Dermax Therapeutic Shampoo Suitable for Long-Term Use?

 

Dermax therapeutic shampoo is generally used as a short-term treatment — typically twice weekly for two weeks — followed by a maintenance phase of once weekly or fortnightly applications. Long-term daily use is not recommended, as prolonged exposure to selenium sulphide can occasionally cause scalp dryness or temporary changes in hair texture. If your symptoms persist beyond four weeks of use, it's worth speaking to your GP, as you may need further investigation or a different treatment approach. You might also find it helpful to explore our skin care collection for complementary products that support scalp and skin health.

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.

Dermax Therapeutic Shampoo 250ml specifications
Treatment category Scalp conditions — dandruff, seborrhoeic dermatitis
Active ingredient Selenium sulphide 2.5%
Mechanism of action Antifungal and cytostatic — reduces Malassezia yeast growth and slows scalp cell turnover
Suitable for Adults and children over 5 years
Pack size 250ml
UK classification General Sale / Pharmacy (P)
Drug class Antifungal / Cytostatic scalp treatment
Preparation Medicated shampoo
Route of administration Topical (scalp)

Specifications of Dermax Therapeutic Shampoo 250ml

 

What Is Dermax Therapeutic Shampoo and What Is It Used For?

 

Dermax Therapeutic Shampoo 250ml is a medicated scalp treatment containing selenium sulphide 2.5% as its active ingredient. It is used to treat dandruff (pityriasis capitis) and seborrhoeic dermatitis of the scalp — two related conditions that cause flaking, itching, and sometimes redness of the scalp. Seborrhoeic dermatitis is a common inflammatory skin condition that can affect the scalp, face, and other areas where sebaceous glands are concentrated. The NHS notes that dandruff and seborrhoeic dermatitis are among the most frequently encountered scalp complaints in adults.

 

What Do You Need to Know Before Using Dermax Therapeutic Shampoo?

 

Before using this shampoo, read the following carefully. There are some situations where this product should not be used, and others where extra caution is needed.

Do not use Dermax Therapeutic Shampoo if you:

  • Are allergic to selenium sulphide or any other ingredient in the formulation
  • Have broken, inflamed, or infected skin on the scalp
  • Are applying it to areas other than the scalp (unless directed by a doctor)
  • Are under five years of age

Use with caution if you:

  • Have chemically treated, permed, or colour-treated hair — selenium sulphide may cause discolouration
  • Are pregnant or breastfeeding — speak to your GP or pharmacist before use
  • Have a history of sensitive skin or eczema

Known drug interactions:

  • No significant systemic drug interactions are currently documented for topical selenium sulphide at this concentration
  • Avoid using alongside other medicated scalp treatments unless advised by a healthcare professional

 

How Should You Use Dermax Therapeutic Shampoo?

 

Always use this shampoo exactly as directed on the label or as advised by your pharmacist. Do not use more than recommended, and avoid contact with your eyes, nose, and mouth. If accidental contact occurs, rinse thoroughly with water.

  1. Wet your hair and scalp thoroughly with warm water
  2. Apply a small amount of Dermax Therapeutic Shampoo directly to the scalp
  3. Massage gently into the scalp using your fingertips
  4. Leave the shampoo on the scalp for 2–3 minutes
  5. Rinse thoroughly with clean water
  6. Repeat the application if necessary, then rinse again
  7. Wash hands after use
Indication Age Group Frequency Duration
Dandruff treatment Adults & children over 5 Twice weekly 2 weeks initially
Dandruff maintenance Adults & children over 5 Once weekly or fortnightly As needed
Seborrhoeic dermatitis Adults Twice weekly As directed by pharmacist or GP

 

What Are the Possible Side Effects of Dermax Therapeutic Shampoo?

 

Like all medicines, Dermax Therapeutic Shampoo can cause side effects, although not everyone will experience them. If you notice anything unusual or concerning, stop use and speak to your pharmacist or GP. You may also find useful information about managing skin reactions in our creams and ointments collection.

Common side effects:

  • Scalp irritation or a mild burning sensation
  • Dryness or increased oiliness of the scalp
  • Temporary hair discolouration, particularly in lighter or chemically treated hair

Less common side effects:

  • Hair loss or increased hair shedding (usually temporary)
  • Skin rash or allergic reaction at the site of application
  • Unpleasant smell on the hair or scalp

Serious allergic reactions to selenium sulphide are rare but possible. Signs include swelling of the face, lips, or throat, difficulty breathing, or a widespread skin rash. If you experience any of these, seek emergency medical attention immediately.

 

How Should You Store Dermax Therapeutic Shampoo?

 

Correct storage helps maintain the effectiveness of this product. If you're managing multiple healthcare products at home, it's worth keeping all medicines stored safely and separately. For other scalp and skin health products, browse our skin care collection for further options.

  • Store below 25°C in a cool, dry place
  • Keep out of direct sunlight
  • Keep the cap tightly closed when not in use
  • Keep out of reach and sight of children
  • Do not use after the expiry date printed on the bottle
  • Do not dispose of medicines via wastewater or household waste — return unused product to your pharmacy

Written and reviewed by our qualified team

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 Dermax Therapeutic Shampoo online in the UK?

You can buy Dermax Therapeutic Shampoo 250ml directly from Cured Pharmacy, a GPhC-registered UK online pharmacy, for just £9.79. It's available without a prescription and can be ordered from our hair care collection. No GP visit is required — simply add it to your basket and check out.

How does Dermax Therapeutic Shampoo work in the body?

Dermax Therapeutic Shampoo contains selenium sulphide 2.5%, which acts as both an antifungal and a cytostatic agent on the scalp. It slows down the excessive shedding of scalp skin cells that causes visible flaking, while simultaneously inhibiting the growth of Malassezia yeast — a key driver of dandruff and seborrhoeic dermatitis. The result is a calmer, less flaky scalp with regular use.

How do I use Dermax Therapeutic Shampoo step by step?

Wet your hair thoroughly, apply a small amount of the shampoo to your scalp, and massage it in gently with your fingertips. Leave it on for 2–3 minutes before rinsing thoroughly — this contact time is important for the active ingredient to work effectively. Repeat the application if needed, then rinse again and wash your hands afterwards.

How often should I use Dermax Therapeutic Shampoo?

For the initial treatment of dandruff or seborrhoeic dermatitis, use Dermax Therapeutic Shampoo twice a week for two weeks. After that, a maintenance frequency of once weekly or once a fortnight is usually sufficient to keep symptoms under control. Always follow the directions on the label or the advice of your pharmacist.

What are the side effects of Dermax Therapeutic Shampoo?

The most commonly reported side effects include mild scalp irritation, dryness, or a temporary increase in scalp oiliness. Some people notice a slight change in hair colour, particularly if their hair is light or chemically treated — this is usually temporary. If you experience a rash, swelling, or difficulty breathing, stop use immediately and seek medical advice.

Can I use Dermax Therapeutic Shampoo on coloured or chemically treated hair?

Selenium sulphide can interact with chemically treated, permed, or colour-treated hair and may cause temporary discolouration. If your hair has been dyed or chemically processed, it's advisable to speak to your pharmacist before starting treatment. In some cases, an alternative medicated shampoo may be more appropriate.

Is Dermax Therapeutic Shampoo safe to use during pregnancy?

There is limited clinical data on the safety of selenium sulphide shampoos during pregnancy or breastfeeding. As a precaution, you should speak to your GP or pharmacist before using Dermax Therapeutic Shampoo if you are pregnant, planning to become pregnant, or currently breastfeeding. They can advise on the safest option for your situation.

Who is eligible to use Dermax Therapeutic Shampoo?

Dermax Therapeutic Shampoo is suitable for adults and children aged five years and over who have dandruff or seborrhoeic dermatitis of the scalp. It is not suitable for use on broken, inflamed, or infected skin, and should not be used by anyone with a known allergy to selenium sulphide. If you're unsure whether it's right for you, ask your pharmacist.

What happens if I accidentally get Dermax Therapeutic Shampoo in my eyes?

If the shampoo comes into contact with your eyes, rinse them immediately and thoroughly with clean, lukewarm water for several minutes. Selenium sulphide can cause irritation to the eyes and mucous membranes. If irritation persists after rinsing, seek advice from a pharmacist or visit your nearest eye care service — you can find related products in our eye care collection.

What are the alternatives to Dermax Therapeutic Shampoo?

Common alternatives include ketoconazole 2% shampoo (such as Nizoral), zinc pyrithione-based shampoos, coal tar preparations, and salicylic acid shampoos. Each works through a slightly different mechanism, and the best choice depends on the severity of your condition and any sensitivities you may have. Your pharmacist can help you compare options and choose the most suitable one.

How long does it take for Dermax Therapeutic Shampoo to work?

Many people notice a reduction in flaking and itching within the first two weeks of twice-weekly use. However, the full benefit is usually seen after completing the initial treatment course. If there is no improvement after four weeks of consistent use, it's worth speaking to your GP, as further investigation may be needed.

How long can you use Dermax Therapeutic Shampoo for?

Dermax Therapeutic Shampoo is not intended for continuous daily long-term use. After the initial two-week treatment phase, it should be used on a maintenance basis — typically once a week or once a fortnight. If you find you need to use it more frequently to keep symptoms at bay, consult your GP or dermatologist for further assessment.

Can Dermax Therapeutic Shampoo be used on the face or body?

Dermax Therapeutic Shampoo is formulated specifically for scalp use and should not be applied to the face or body unless a doctor has specifically directed you to do so. Seborrhoeic dermatitis can affect other areas such as the face and chest, but these areas may require different formulations. Speak to your GP if you need treatment for seborrhoeic dermatitis beyond the scalp.

Does Dermax Therapeutic Shampoo interact with other medicines?

No significant systemic drug interactions have been documented for topical selenium sulphide at the concentration found in Dermax Therapeutic Shampoo. However, you should avoid using it alongside other medicated scalp treatments at the same time unless advised by a healthcare professional. If you are taking any prescription medicines, it's always worth mentioning new products to your pharmacist.

What are the latest findings on selenium sulphide for dandruff treatment?

Selenium sulphide has been used as a medicated scalp treatment for several decades and remains a well-established option recommended in UK clinical guidance for dandruff and seborrhoeic dermatitis. Published literature continues to support its antifungal and cytostatic properties as effective mechanisms for reducing scalp flaking. It is listed in the British National Formulary (BNF) as a recognised treatment for these conditions.

How Should You Use Dermax Therapeutic Shampoo?

Using Dermax Therapeutic Shampoo correctly makes a real difference to how well it works. The key is allowing the active ingredient — selenium sulphide 2.5% — adequate contact time with the scalp before rinsing. Always read the label before use and follow these steps carefully.

What Is the Correct Dose of Dermax Therapeutic Shampoo?

There is no fixed measured dose for this shampoo — a small amount applied to the scalp is sufficient for each use. Using more than needed does not improve results and may increase the risk of scalp irritation. The table below outlines the recommended usage frequency by indication and age group.

When Is the Best Time to Use Dermax Therapeutic Shampoo?

There is no strict time of day requirement for using this shampoo — morning or evening use is equally effective. Many people find it most convenient to use during their regular shower or bath routine. What matters most is consistency: using it at the same intervals each week helps maintain the antifungal and cytostatic effect on the scalp.

If you have colour-treated hair, consider using the shampoo before any planned hair colouring appointments, as selenium sulphide may affect dye uptake. Allow adequate time between application and any chemical hair treatments.

How Long Can You Use Dermax Therapeutic Shampoo For?

Dermax Therapeutic Shampoo is not intended for continuous daily use over an extended period. The standard approach is an initial treatment phase of twice-weekly use for two weeks, followed by a maintenance phase of once weekly or once a fortnight as needed to prevent recurrence. If your symptoms have not improved after four weeks of consistent use, or if they worsen at any point, stop using the product and consult your GP or pharmacist for further advice.

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

What Are the Most Common Side Effects of Dermax Therapeutic Shampoo?

Most people tolerate Dermax Therapeutic Shampoo well when used as directed. However, as with any medicated product, some side effects can occur. The most frequently reported ones are localised to the scalp and are generally mild.

  • Mild scalp irritation or a slight burning sensation during or after application
  • Dryness of the scalp or hair
  • Increased oiliness of the scalp in some individuals
  • Temporary discolouration of light-coloured, bleached, or chemically treated hair
  • Unpleasant odour on the hair or scalp after use

What Are the Less Common Side Effects of Dermax Therapeutic Shampoo?

Less commonly, some people may experience more noticeable reactions. These are not typical but are worth being aware of before you start using the product.

  • Increased hair shedding or temporary hair loss — usually reversible once treatment is stopped
  • Skin rash or redness at the site of application
  • Scalp tenderness or sensitivity that persists beyond the first few uses
  • Dryness or brittleness of the hair shaft with prolonged use

What Are the Serious Side Effects of Dermax Therapeutic Shampoo?

Serious reactions to topical selenium sulphide are rare but can occur, particularly in people with a known sensitivity or allergy to the ingredient. You should stop using the product immediately and seek urgent medical attention if you notice any of the following:

  • Swelling of the face, lips, tongue, or throat
  • Difficulty breathing or swallowing
  • A widespread skin rash or hives
  • Severe scalp inflammation or blistering

These symptoms may indicate a serious allergic reaction (anaphylaxis) and require emergency treatment. Do not wait to see if symptoms resolve on their own.

What Should You Do If You Experience Side Effects of Dermax Therapeutic Shampoo?

For mild side effects such as scalp dryness or irritation, reducing the frequency of use often helps. Make sure you are rinsing the product off thoroughly, as residue left on the scalp can increase irritation. If side effects are persistent or worsening, stop use and speak to your pharmacist or GP before continuing treatment.

You can also report suspected side effects directly to the MHRA via the Yellow Card scheme at yellowcard.mhra.gov.uk. This helps improve the safety monitoring of medicines available in the UK.

Can Dermax Therapeutic Shampoo Interact With Other Medicines?

No clinically significant systemic drug interactions have been identified for topical selenium sulphide at the concentration used in Dermax Therapeutic Shampoo. Because it is applied to the scalp and rinsed off, systemic absorption is minimal under normal conditions. However, you should avoid using it at the same time as other medicated scalp treatments unless a healthcare professional has specifically advised this, as combining active ingredients on the scalp may increase the risk of irritation.

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

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Content last updated: 31 Mar 2025

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