Dermax Therapeutic Shampoo Dermax Therapeutic Shampoo treats dry, scaly scalp conditions including seborrhoeic eczema, seborrhoeic dermatitis & severe dandruff (pityriasis capitis). It contains the active ingredient benzalkonium chloride which works in two ways: It loosens the scales from the scalp & lifting them from the hair. It acts as a mild antiseptic to combat the micro-organisms that can make these scalp conditions worse. It also contains coconut oil, a beneficial scalp conditioner. Dermax Therapeutic Shampoo can be used by adults, the elderly & children, including pregnant & breastfeeding women.