Medicated Oatmeal Shampoo A combination of active botanical ingredients which produce an amazing and truly potent anti-itch shampoo. E-Z Grooms Medicated Oatmeal Shampoo combines plant derived extracts combined with colloidal oatmeal and effective, anti-inflammatory essential oils. The herbal extracts have been derived form Chinese herbal medicine sources and are used extensively for the relief of skin disorders. May be used on Cats. 4:1 Conc.