Ceanel concentrate should only be used externally on the scalp and afflicted regions of skin. It must not be taken orally. You should take care not to get shampoo in your eyes. When treating your scalp, shut your eyes or cover your eyes with a towel while using the shampoo. This will prevent any possible eye irritation. The chemical compound cetrimide is toxic to humans. It may cause skin irritation when applied to open wounds or skin diseases such as eczema or psoriasis. Use caution not to get cetrimide in your eyes when applying it to your scalp. Cetrimide is classified as an alkylating agent that works by attaching itself to DNA inside cells and preventing them from functioning properly. This can lead to death of healthy cells and allows cancer cells to survive. The drug should not be taken by women who are or may become pregnant because it can cause birth defects or miscarriage. Women of child-bearing age should be warned about the risks of taking cetrimide if they plan to get pregnant. Use protection when handling chemicals and waste materials. Wear protective gloves, boots, and goggles when working with hazardous substances. Keep children away from dangerous chemicals. In case you feel ill after use, expose not eat, drink, smoke cigarettes; call a doctor immediately.