Anti-Dandruff or Regular Shampoo: What Makes It 'Medicated'?

White flakes on a dark sweater — and the first thought is "I'm not rinsing well" or "my skin is dry." So you wash more often, pick a gentler shampoo — and the flakes multiply. Because dandruff isn't about cleanliness. It's about a fungus.

How it works

Malassezia lives on nearly everyone's scalp — it feeds on sebum and usually behaves. But in some people, its metabolic byproducts irritate the skin, which then panics: cells renew several times faster than normal, don't mature properly, and shed as large oily flakes. Sound familiar?

Regular shampoo washes away flakes and oil — things improve for a day or two. But the fungal colony stays put, fresh sebum keeps arriving, and the cycle repeats. Washing more often is pointless: it's raking leaves while the tree keeps dropping them.

A medicated shampoo carries an active ingredient: zinc pyrithione (Zinc Pyrithione), ketoconazole (Ketoconazole 1–2% — the pharmacy classic), selenium sulfide (Selenium Sulfide), piroctone olamine (Piroctone Olamine) or coal tar. All of them shrink the fungal population. The usage rule labels stay quiet about: leave the lather on the scalp for 3–5 minutes — the antifungal agent needs contact time.

Choose medicated if

• flakes are regular, the scalp itches, roots get oily fast;
• a month of ordinary "gentle" shampoos changed nothing;
• dandruff returned after you stopped — the course was incomplete.

Regular is enough if

• the "dandruff" turned out to be dryness from a harsh shampoo or coloring;
• your treatment course is done — maintain results using the medicated one weekly;
• there are no flakes — antifungals "for prevention" aren't a thing.

Common mistake. Lathering the medicated shampoo and rinsing immediately, like a regular one. Ketoconazole and zinc need minutes of skin contact — instant rinsing turns treatment into expensive foam. Lather up — and go wash your shoulders while you wait.

Fun fact: Malassezia is so picky it only grows on oily surfaces — which is why dandruff favors oily scalps, and children rarely have it before puberty: not enough sebum on the menu yet.