Selsun shampoo is an anti-dandruff shampoo that contains Selenium Sulphide. Selsun Shampoo helps to treat and control dandruff through its unique dual-action benefit. It kills the root cause of dandruff, i.e. certain types of fungi whose overgrowth on the scalp causes dandruff. It helps prevent the build-up of skin cells, preventing flaking and itching of the scalp. Selsun is an anti-dandruff shampoo for both men and women and comes with an improved fragrance. Selsun shampoo must be used twice weekly for two weeks and then only when necessary or as directed by the physician.