Selsun Shampoo is a medicated anti-dandruff shampoo designed to provide medical treatment for itchy flaky scalps. This shampoo has a double-action formula which helps to soothe the scalp reduce dandruff and prevent flakes from reappearing. It can also help treat seborrhea dermatitis. It works to reduce and remove dandruff in two ways: gently drying the scalp to reduce greasiness whilst slowing down the growth of skin cells which can lead to dandruff. It leaves hair soft and clean and is suitable for sensitive scalps. It contains 2.5%wv Selenium Sulphide to help stop problems with irritated scalps and dandruff working to reduce flakiness and itchiness from the first wash.