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Selsun Anti Dandruff Shampoo 100ml

Selsun Anti Dandruff Shampoo 100ml

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  • ✔️ Targets Malassezia yeast, the root cause of dandruff
  • ✔️ Reduces visible flaking and scalp itching effectively
  • ✔️ Selenium sulphide 2.5% clinically established for seborrhoeic dermatitis
  • ✔️ Suitable for adults and children aged five and over
  • ✔️ Works as both a treatment and long-term maintenance shampoo

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Is Selsun Anti Dandruff Shampoo Right for You?

 

Dandruff affects roughly half of all adults at some point in their lives, and for many people it can be persistent, embarrassing, and frustrating to manage. Selsun anti dandruff shampoo is a clinically established, medicated shampoo containing selenium sulphide 2.5% — an active ingredient with a long track record of tackling dandruff and seborrhoeic dermatitis of the scalp. Available without a prescription, it offers a straightforward option for people who want something more targeted than a standard cosmetic shampoo. If you're exploring your options, you'll find a range of related products in our hair care collection.

Seborrhoeic dermatitis is a common skin condition that causes flaky, scaly patches, most often on the scalp. It's linked to an overgrowth of a naturally occurring yeast called Malassezia, and it can cause itching, redness, and visible flaking. Selsun shampoo addresses this at the source rather than simply masking symptoms.

 

How Does Selsun Anti Dandruff Shampoo Work?

 

Selenium sulphide, the active ingredient in Selsun, works through two main mechanisms. It reduces the rate at which scalp skin cells multiply and shed — a process that's accelerated in dandruff — and it has antifungal properties that help suppress the Malassezia yeast responsible for triggering the condition.

  • Slows excessive skin cell turnover on the scalp
  • Reduces Malassezia yeast activity, which is linked to dandruff and seborrhoeic dermatitis
  • Decreases visible flaking and associated scalp itching
  • Provides both treatment and maintenance when used as directed

It's worth noting that selenium sulphide is a cytostatic agent — it doesn't kill the yeast outright but rather creates an environment where it can't thrive as easily. This is why consistent, regular use matters more than a single application.

 

Who Should Use Selsun Anti Dandruff Shampoo?

 

Selsun is suitable for adults and children aged 5 and over who are experiencing dandruff or seborrhoeic dermatitis of the scalp. It's particularly useful when over-the-counter cosmetic shampoos haven't provided adequate relief. That said, it's not appropriate for everyone.

  • Adults with persistent or recurrent dandruff
  • People with seborrhoeic dermatitis of the scalp
  • Those who haven't responded to standard cosmetic anti-dandruff shampoos
  • Individuals aged 5 and over (not recommended for younger children)

If you have an inflamed, broken, or infected scalp, you should speak to your GP before using this product. Similarly, if you have a known sensitivity to selenium compounds, this shampoo is not appropriate for you.

 

How Does Selsun Compare to Other Dandruff Shampoos?

 

Feature Selsun Anti Dandruff Shampoo Nizoral Anti-Dandruff Shampoo
Active ingredient Selenium sulphide 2.5% Ketoconazole 1%
Mechanism Cytostatic + antifungal Antifungal only
Suitable for children Age 5 and over Age 12 and over (OTC)
UK classification General Sale / Pharmacy Medicine Pharmacy Medicine

 

How Should You Store Selsun Anti Dandruff Shampoo?

 

Store Selsun anti dandruff shampoo below 25°C, away from direct sunlight and heat. Keep the bottle tightly closed when not in use, and always store it out of the reach and sight of children. Do not use the product after the expiry date printed on the bottle.

If you're managing a scalp condition alongside other skin concerns, it may be worth browsing our skin care collection for complementary products. Always check with your pharmacist if you're unsure whether Selsun is appropriate alongside any other topical treatments you're currently using.

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.

Selsun Anti Dandruff Shampoo 100ml specifications
Treatment category Dandruff / Seborrhoeic dermatitis
Active ingredient Selenium sulphide 2.5%
Mechanism of action Cytostatic agent; reduces skin cell turnover and suppresses Malassezia yeast
Suitable for Adults and children aged 5 and over
Pack size 100ml
UK classification Pharmacy Medicine (P)
Drug class Antifungal / cytostatic scalp treatment
Preparation Medicated shampoo
Route of administration Topical (scalp)

Specifications of Selsun Anti Dandruff Shampoo 100ml

 

What Is Selsun Anti Dandruff Shampoo and What Is It Used For?

 

Selsun Anti Dandruff Shampoo 100ml is a medicated scalp treatment containing selenium sulphide 2.5% as its active ingredient. It is used to treat dandruff and seborrhoeic dermatitis of the scalp — two closely related conditions characterised by flaking, itching, and sometimes redness of the scalp. Dandruff is one of the most common scalp complaints in the UK, and while it isn't harmful, it can significantly affect confidence and quality of life. Selsun works by targeting the underlying causes rather than simply washing away visible flakes.

Seborrhoeic dermatitis can also affect other areas of the face and body, but this shampoo is specifically formulated for scalp use only. It is available over the counter and does not require a prescription for adults.

 

What Do You Need to Know Before Using Selsun Anti Dandruff Shampoo?

 

Before using this shampoo, read the following carefully. There are situations where Selsun may not be suitable, and it's important to be aware of them.

Do not use Selsun if you:

  • Are allergic to selenium sulphide or any other ingredient in the shampoo
  • Have broken, inflamed, or infected skin on your scalp
  • Are under 5 years of age
  • Have acutely inflamed seborrhoeic dermatitis — seek medical advice first

Warnings and precautions:

  • Avoid contact with eyes — rinse immediately with water if contact occurs
  • Do not use on bleached, tinted, grey, or permed hair without first consulting a pharmacist, as discolouration may occur
  • Do not use more frequently than directed — overuse can increase the risk of scalp irritation
  • Speak to your GP or pharmacist before use if you are pregnant or breastfeeding
  • Keep out of reach of children

Drug interactions:

  • No clinically significant interactions are known when selenium sulphide is used topically as directed
  • If you are using other scalp treatments or medicated products, check with your pharmacist before combining them

 

How Should You Use Selsun Anti Dandruff Shampoo?

 

Always use Selsun exactly as described in the patient information leaflet or as directed by your pharmacist. Do not exceed the recommended frequency of use.

  1. Wet your hair and scalp thoroughly with warm water
  2. Apply a small amount of Selsun shampoo directly to the scalp
  3. Massage gently into the scalp, working into a lather
  4. Leave the shampoo on the scalp for 2 to 3 minutes
  5. Rinse thoroughly — ensure no residue remains on the scalp or skin
  6. Repeat the application if desired, then rinse again
  7. Wash hands thoroughly after use
Indication Age Group Dose Frequency
Dandruff treatment Adults & children ≥5 years Small amount to wet scalp Twice weekly for 2 weeks
Dandruff maintenance Adults & children ≥5 years Small amount to wet scalp Once weekly or once every 2 weeks
Seborrhoeic dermatitis Adults Small amount to wet scalp As directed by pharmacist or GP

 

What Are the Possible Side Effects of Selsun Anti Dandruff Shampoo?

 

Like all medicines, Selsun can cause side effects, although not everyone experiences them. Most side effects are mild and localised to the scalp or hair.

Common side effects:

  • Scalp irritation or a mild burning sensation
  • Dryness or increased oiliness of the scalp or hair
  • Temporary hair loss with prolonged use (usually reversible)
  • Discolouration of hair, particularly in lighter or chemically treated hair

Less common side effects:

  • Skin rash or allergic reaction at the site of application
  • Systemic absorption is very low with topical use, but avoid applying to broken skin to minimise any risk

If you notice any signs of a serious allergic reaction — such as swelling of the face, lips, or throat, or difficulty breathing — stop using the product immediately and seek urgent medical attention. For people managing hair thinning alongside dandruff, our female hair loss collection may offer additional support options.

 

How Should You Store Selsun Anti Dandruff Shampoo?

 

  • Store below 25°C in a cool, dry place
  • Keep away from direct sunlight and sources of heat
  • Keep the cap tightly closed after each use
  • Store out of the 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 Selsun anti dandruff shampoo online in the UK?

You can buy Selsun anti dandruff shampoo 100ml directly from Cured Pharmacy, a GPhC-registered UK online pharmacy. It is available without a prescription as an over-the-counter product. Simply add it to your basket and it will be dispatched to your door.

How does Selsun shampoo work on dandruff?

Selsun contains selenium sulphide 2.5%, which works by slowing the excessive rate of scalp skin cell turnover that causes visible flaking. It also has antifungal properties that help suppress the Malassezia yeast closely associated with dandruff and seborrhoeic dermatitis. Together, these two actions address both the symptoms and the underlying trigger.

How do I use Selsun anti dandruff shampoo step by step?

Wet your hair thoroughly, apply a small amount of Selsun to the scalp, and massage gently into a lather. Leave it on for 2 to 3 minutes before rinsing thoroughly — make sure no residue is left on the scalp or surrounding skin. Wash your hands after use and avoid getting the shampoo in your eyes.

How often should I use Selsun anti dandruff shampoo?

For the initial treatment of dandruff, Selsun is typically used twice a week for two weeks. After that, once weekly or once every two weeks is usually sufficient for maintenance. Always follow the directions on the label or the advice of your pharmacist.

What are the side effects of Selsun anti dandruff shampoo?

The most commonly reported side effects include scalp irritation, dryness, and temporary discolouration of lighter or chemically treated hair. Some people notice increased oiliness or, with prolonged use, temporary hair shedding — though this is usually reversible once use is stopped. If you experience a rash or signs of an allergic reaction, stop using the product and speak to your pharmacist.

Can I use Selsun shampoo if I have coloured or bleached hair?

Selenium sulphide can cause discolouration in bleached, tinted, grey, or permed hair, so caution is advised. It's best to speak to your pharmacist before using Selsun if your hair has been chemically treated. They can help you weigh up the benefits against the risk of colour change.

Is Selsun anti dandruff shampoo safe during pregnancy?

There is limited clinical data on the use of selenium sulphide during pregnancy, so it's important to consult your GP or pharmacist before using Selsun if you are pregnant or breastfeeding. Topical absorption is generally low, but professional guidance is always the safest approach during pregnancy.

Who is eligible to use Selsun anti dandruff shampoo?

Selsun is suitable for adults and children aged 5 and over who have dandruff or seborrhoeic dermatitis of the scalp. It is not recommended for children under 5, or for anyone with broken, inflamed, or infected scalp skin. If you have an underlying skin condition, speak to your GP before starting treatment.

What happens if I use Selsun shampoo too often?

Using Selsun more frequently than recommended can increase the risk of scalp irritation, dryness, and hair discolouration. It may also lead to temporary hair shedding with prolonged overuse. Stick to the recommended frequency — twice weekly for two weeks initially, then reduce to a maintenance schedule.

What are the alternatives to Selsun anti dandruff shampoo?

Alternatives include ketoconazole shampoos (such as Nizoral), zinc pyrithione-based shampoos, coal tar preparations, and salicylic acid shampoos. The right choice depends on the severity of your dandruff and whether you have an underlying condition like seborrhoeic dermatitis — your pharmacist can advise. You can also explore our skin care collection for related products.

How long does it take for Selsun shampoo to work?

Many people notice a reduction in flaking and itching within the first two weeks of twice-weekly use. However, seborrhoeic dermatitis can be a chronic condition, and some people need ongoing maintenance use to keep symptoms under control. If there's no improvement after four weeks, speak to your GP.

How long can you use Selsun anti dandruff shampoo for?

Selsun can be used for an initial two-week treatment course, followed by a maintenance phase of once weekly or once every two weeks. Long-term continuous use at high frequency is not recommended without medical supervision. If your symptoms persist or worsen, consult your GP or dermatologist.

Can Selsun shampoo cause hair loss?

Temporary hair shedding has been reported with prolonged or frequent use of selenium sulphide shampoo, but this is generally reversible once use is reduced or stopped. If you're concerned about hair thinning alongside dandruff, our female hair loss collection includes additional options worth exploring. Always speak to your pharmacist if you notice significant hair loss.

Can Selsun shampoo be used for seborrhoeic dermatitis?

Yes — Selsun anti dandruff shampoo is indicated for both dandruff and seborrhoeic dermatitis of the scalp. Seborrhoeic dermatitis is a more persistent inflammatory condition linked to Malassezia yeast overgrowth, and selenium sulphide's dual cytostatic and antifungal action makes it a suitable treatment option. If your seborrhoeic dermatitis is severe or affects areas beyond the scalp, see your GP.

What are the latest findings on selenium sulphide for dandruff?

Selenium sulphide has been used as a dandruff treatment for decades and remains a well-established option supported by clinical evidence. Current NHS and BNF guidance continues to recommend it as an effective treatment for dandruff and seborrhoeic dermatitis of the scalp. Research consistently supports its antifungal and cytostatic properties as the basis for its effectiveness.

How Should You Use Selsun Anti Dandruff Shampoo?

Using Selsun correctly makes a real difference to how well it works. Always apply it to wet hair and scalp — never to dry hair — and make sure you rinse thoroughly afterwards to avoid any residue sitting on the scalp or running onto the skin.

What Is the Correct Dose of Selsun Anti Dandruff Shampoo?

There is no fixed measured dose for Selsun — a small amount applied to the wet scalp is sufficient for each use. The key variable is frequency, not quantity. Using more product per application does not improve results and may increase the risk of scalp irritation.

When Is the Best Time to Use Selsun Anti Dandruff Shampoo?

There is no specific time of day that is clinically superior for using Selsun — morning or evening use is equally effective. What matters most is that you leave the shampoo on the scalp for the full 2 to 3 minutes before rinsing, so factor that into your routine. Many people find it easiest to incorporate it into their regular shower or bath schedule on their designated treatment days.

Avoid using Selsun immediately before or after applying other scalp treatments unless your pharmacist has confirmed it is safe to do so. If you colour or style your hair, apply Selsun before any chemical treatments, not after.

How Long Can You Use Selsun Anti Dandruff Shampoo For?

The initial treatment course is two weeks, using the shampoo twice weekly. After that, most people move to a maintenance schedule of once weekly or once every two weeks to keep dandruff under control. Dandruff and seborrhoeic dermatitis are often chronic conditions, so ongoing maintenance use is common and generally well tolerated at the recommended frequency.

If your symptoms have not improved after four weeks of use, or if they worsen at any point, stop using the product and consult your GP or pharmacist. Prolonged use at higher-than-recommended frequency is not advised without medical supervision.

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 Selsun Anti Dandruff Shampoo?

Most people tolerate Selsun well when used as directed, but some side effects can occur. These are usually mild and affect the scalp or hair rather than the body as a whole. If you experience any of the following, they will often resolve on their own once you reduce the frequency of use or stop treatment.

  • Scalp irritation or a mild burning or stinging sensation after application
  • Dryness of the scalp or hair
  • Increased oiliness of the scalp in some individuals
  • Discolouration of hair — particularly in bleached, tinted, grey, or permed hair

What Are the Less Common Side Effects of Selsun Anti Dandruff Shampoo?

Less commonly, some people may experience side effects that are slightly more noticeable or persistent. These are still generally mild and localised, but they're worth being aware of before you start using the product.

  • Temporary hair shedding or thinning with prolonged or frequent overuse — this is usually reversible once use is reduced
  • Skin rash or contact dermatitis at the site of application
  • Scalp flaking that temporarily worsens before improving — this can happen in the first few days of treatment

What Are the Serious Side Effects of Selsun Anti Dandruff Shampoo?

Serious side effects from topical selenium sulphide are rare when the product is used correctly. However, you should be aware of the signs of a serious allergic reaction (hypersensitivity), which — though uncommon — can occur with any medicine.

Seek urgent medical attention if you experience any of the following after using Selsun:

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

Systemic absorption of selenium sulphide through intact skin is very low. However, avoid applying the shampoo to broken, cracked, or inflamed skin, as absorption may be higher in these areas.

What Should You Do If You Experience Side Effects of Selsun Shampoo?

If you notice mild scalp irritation or dryness, try reducing the frequency of use and see whether symptoms settle. Make sure you are rinsing the shampoo off thoroughly, as residue left on the scalp can contribute to irritation. If side effects are persistent or troublesome, stop using the product and speak to your pharmacist or GP.

You can also report suspected side effects directly to the MHRA through the Yellow Card scheme at yellowcard.mhra.gov.uk. This helps regulators monitor the safety of medicines used in the UK.

Can Selsun Anti Dandruff Shampoo Interact With Other Medicines?

No clinically significant drug interactions have been identified for selenium sulphide when used topically as directed. Because the shampoo is applied to the scalp and rinsed off, systemic absorption is minimal and the risk of interactions with oral medicines is very low. That said, if you are using other medicated scalp treatments at the same time — such as topical corticosteroids or antifungal preparations — check with your pharmacist before combining them, as this could affect tolerability.

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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