First of all, potassium permanganate is a drug that can easily be made into a narcotic and is now a national security level drug. Pharmacies are not qualified to buy and sell it. Secondly, potassium permanganate has strong oxidizing property, and the high concentration of potassium permanganate solution has certain corrosive property. In addition, potassium permanganate solution has an antibacterial effect, but the scope of use is small, and it is generally not used in the clinical aspect. Potassium permanganate, an inorganic compound with the molecular formula KMnO₄, is commonly known as gray manganese oxide, and has the shape of purple-black needle-like crystals. First of all, potassium permanganate is a strong oxidizing agent and can be made into dangerous products such as explosives. It is reduced when it encounters ethanol (alcohol) and oxidized in acidic environments. Secondly, higher concentrations of potassium permanganate solutions are corrosive and can also damage the mucous membranes of the skin. In addition, potassium permanganate has been recognized as a Class III vulnerable chemical, which belongs to the state-controlled products, therefore, the sale of potassium permanganate is prohibited in ordinary pharmacies. It needs to be approved by the relevant departments before it can be bought and sold, so it is said that pharmacies are not qualified to deal with potassium permanganate nowadays.