Nizoral anti dandruff shampoo contains a medicine called ketoconazole. This belongs to a group of medicines called 'antifungals'. Like other shampoos, it also contains ingredients to clean your hair. Nizoral shampoo is used for fungal infections on the scalp & body such as: • Dandruff • Dry or greasy scaling of the scalp & other parts of the body called ‘seborrhoeic dermatitis’ • White to brown patches on the body that sometimes appear after being in the sun called ‘tinea versicolor’ or ‘pityriasis versicolor’ These conditions can be itchy. They are caused by a fungus (yeast) called ‘ Malassezia’. This fungus is found on everyone’s skin, but sometimes it can overgrow & cause problems. Nizoral shampoo works by killing the fungus & stopping it from coming back. 2. What you need to know before