T/Gel is a medicated shampoo that uses coal tar as its active ingredient to treat itchy, flaky scalp conditions like dandruff, psoriasis, and seborrheic dermatitis. Originally made by Neutrogena, it contains 0.5% coal tar and has been one of the most widely recognized over-the-counter treatments for persistent scalp problems. If regular dandruff shampoos haven’t worked for you, T/Gel is the type of product that sits one step up in strength.
How T/Gel Works
Coal tar belongs to a class of treatments called keratoplastics, which also includes ingredients like salicylic acid and benzoyl peroxide. Your scalp conditions like psoriasis and seborrheic dermatitis involve skin cells turning over too quickly, piling up into visible flakes, scales, or plaques. Coal tar slows that rapid cell growth, which reduces scaling, flaking, and itching over time. It doesn’t cure the underlying condition, but it controls the symptoms effectively enough that many people use it as a long-term maintenance treatment.
The shampoo works on three specific conditions: ordinary dandruff, seborrheic dermatitis (a more stubborn, inflammatory form of dandruff that causes greasy yellowish scales), and scalp psoriasis (thick, silvery plaques that can extend beyond the hairline). All three involve excessive skin cell buildup, which is why a single active ingredient can address all of them.
How to Use It
T/Gel isn’t meant to be used like a regular shampoo where you lather and rinse immediately. You apply it to wet hair, work it into a lather, and then leave it on the scalp for several minutes before rinsing. That contact time matters because the coal tar needs to stay on the skin long enough to have an effect. Most people use it two to three times per week rather than daily, alternating with a regular shampoo on other days.
One thing that catches people off guard is the smell. Coal tar has a strong, distinctive odor that lingers after washing. The formulation minimizes it somewhat, but you’ll notice it, especially when your hair is still damp.
Side Effects and Precautions
The most common side effect is a mild stinging or burning sensation where the shampoo contacts your scalp. This is more likely if your skin is already irritated or broken from scratching. For most people it’s brief and tolerable, but if you have very sensitive skin, it’s worth paying attention to how your scalp reacts during the first few uses.
Coal tar makes your skin noticeably more sensitive to UV light for up to 24 hours after use. This means sunburns can happen faster and more severely on exposed skin, particularly around your hairline, forehead, and neck. If you’ll be outdoors after washing with T/Gel, wearing a hat or applying sunscreen to exposed areas around your scalp is a practical step.
If you have light-colored hair, there’s a small chance coal tar can cause temporary discoloration. It’s uncommon, but if you’re concerned, testing the product on a few strands before applying it to your whole head is a reasonable precaution.
Is Coal Tar Safe?
This question comes up because coal tar is technically classified as a carcinogen in some industrial contexts. The concentrations used in shampoos like T/Gel (0.5%) are far lower than those associated with occupational exposure. In the 1980s, some coal tar hair dye products were found to cause cancer in animals, prompting the FDA to require warning labels for specific ingredients. The cosmetic industry reformulated those products, and those particular ingredients are no longer used. The FDA continues to monitor coal tar product safety and currently states there is no reliable evidence linking coal tar shampoos on today’s market to cancer.
That said, coal tar shampoos are meant for intermittent, targeted use on your scalp, not prolonged full-body application. Using them as directed for a specific scalp condition is well within established safety guidelines.
Availability and Discontinuation
One important thing to know: Neutrogena has discontinued T/Gel Therapeutic Shampoo in the UK and Ireland. The Psoriasis Association confirmed the news, and Neutrogena’s consumer care team stated the product is no longer being distributed in those markets. Availability varies by country, so depending on where you live, you may still find it on shelves or you may need to look at alternatives. Store-brand versions with the same 0.5% coal tar concentration exist in some markets and work the same way.
Alternatives Worth Knowing About
If T/Gel isn’t available where you are, or if coal tar doesn’t agree with your skin, several other active ingredients treat the same conditions through different mechanisms.
- Ketoconazole shampoos (sold under brand names like Nizoral) work by targeting the fungus that contributes to dandruff and seborrheic dermatitis. They’re one of the most common direct alternatives and are available over the counter in most countries.
- Salicylic acid shampoos help by softening and loosening scales so they wash away more easily. They work well for heavy flaking but don’t address inflammation on their own.
- Ciclopirox shampoos are antifungal treatments sometimes prescribed for seborrheic dermatitis that hasn’t responded to over-the-counter options.
For scalp psoriasis specifically, prescription-strength options like topical steroids may be necessary if over-the-counter coal tar or ketoconazole shampoos aren’t controlling your symptoms. The right choice depends on which condition you’re treating and how your scalp responds, so it’s worth trying one alternative at a time and giving it a few weeks to show results before switching.