Coal tar shampoos have been trusted for decades in treating stubborn scalp conditions such as dandruff, psoriasis, and seborrheic dermatitis. They work by slowing down the rapid growth of skin cells, easing itching and scaling.
But while coal tar is effective, it isn’t without controversy. Concerns over side effects, long-term safety, and the availability of gentler alternatives have led many people to ask:
"Should I keep using coal tar shampoo, or is it time to switch?"
In this guide, we’ll cover everything you need to know about coal tar shampoos and safer alternatives, including:
What is coal tar shampoo and how does it work?
Coal tar shampoo is a medicated treatment derived from coal tar, a by-product of coal processing. Despite its industrial origins, it’s been used for over a century in dermatology.
It works by:
- Slowing skin cell growth - useful for psoriasis, where cells multiply too quickly.
- Reducing itching and inflammation - helps soothe flaky, irritated scalps.
- Controlling dandruff - tackles scaling and itch.
Coal tar shampoos remain available in the UK (e.g. Alphosyl, Exorex, Polytar, and Psoriderm or T/Gel), though certain strengths and formulations are restricted or discontinued due to safety regulations.
Common side effects of Coal Tar shampoo; potential risks and cautions
Coal tar shampoos are effective, but they come with potential drawbacks. According to the NHS and dermatology guidance:
- Scalp irritation → burning, redness, stinging.
- Hair discolouration → particularly on blonde, bleached, or grey hair.
- Photosensitivity → scalp and skin can burn more easily in the sun.
- Unpleasant smell and residue → coal tar has a strong, lingering odour.
- Staining → may stain clothing, towels, or bedding.
- Regulatory caution → some forms of coal tar have been linked to carcinogenic risk in industrial use (though medical shampoos are considered safe when used as directed).
Important: Coal tar shampoos are not designed for everyday, long-term use. They’re typically recommended for short courses or intermittent treatment under medical advice
When should you stop using Coal Tar shampoo?
Coal tar shampoo should not be your forever solution. Stop using and speak to a GP or dermatologist if:
- Irritation or redness worsens.
- You notice unusual hair thinning or breakage.
- You’re treating colour-treated or bleached hair and see discolouration.
- Your psoriasis/dandruff isn’t improving after 4–6 weeks.
- You experience allergic reactions (rash, swelling).
How to switch from Coal Tar shampoo
If you’ve been using coal tar shampoos but want to step back, the safest approach is to transition gradually:
- Alternate washes → Use coal tar only when flare-ups are severe, and swap in a gentler shampoo on other days.
- Hydrate the scalp → Choose shampoos free from unnecessary harsh irritants.
- Add dermatologist-approved alternatives → Some medicated shampoos contain salicylic acid, ketoconazole, or zinc pyrithione, which target dandruff without coal tar.
- Daily gentle care → Use a supportive, scalp-friendly shampoo to maintain balance between treatments.
Everyday alternatives for sensitive scalps
This is where Olsson Scandinavia® Sensitive Shampoo and STUHR® Mild Shampoo play an important role.
Olsson Scandinavia® Sensitive Shampoo
- Developed in Scandinavia to support sensitive scalps.
- Free from unnecessary harsh chemicals and irritants.
- Helps maintain a balanced, comfortable scalp during and after medicated treatment courses.
- Leaves hair healthy-looking, soft, and manageable.
- The Only Haircare Recommended by Allergy UK and Asthma Allergy Nordic. View Allergy UK Listing
STUHR® Mild Shampoo
- Designed for frequent use, even on delicate or reactive scalps.
- Gentle cleansing formula that avoids harshness.
- Ideal for alternating with medicated shampoos to reduce irritation build-up.
- Asthma Allergy Nordic approved.
Everyday tips for sensitive scalps
Coal tar shampoos still play a role in managing difficult scalp conditions, but they’re not without side effects or limitations. For many people, the key is balance - using medicated shampoos only when needed, and supporting scalp health every day with gentler alternatives.
That’s where Olsson Scandinavia® Sensitive Shampoo and STUHR® Mild Shampoo come in: offering reliable, irritant-conscious care designed to keep your scalp and hair healthy in between stronger treatments, ultimately with a goal to reduce the need for medicated treatments.
