Shampoo is a type of topical medication delivery system used for the treatment of various scalp and hair conditions. It is a liquid or semi-liquid preparation that is applied to the hair and scalp, usually after wetting the hair, and is massaged into the skin. The active ingredients in shampoo can include a wide range of substances, such as antifungals, antimicrobials, and medicated moisturizers, depending on the specific condition being treated. Shampoo is commonly used to treat conditions such as dandruff, dry scalp, and seborrheic dermatitis, as well as to provide a general clean and nourishment to the hair and scalp. It is important to always follow the instructions of a healthcare professional when using medicated shampoos to ensure proper dosing and to avoid any adverse reactions. Additionally, it is important to use the shampoo as directed, typically leaving it on the scalp for a certain amount of time before rinsing it off.