Wan Tong Tendon spray expired can no longer be used, any drug beyond the shelf life of drugs can no longer be used, this drug is no exception, in order to avoid irritation of the skin, or allergies and other adverse reactions, causing unnecessary trouble, or even not play a role in the delay of the disease. Drug expiration date refers to the period of time that a drug can maintain its quality under certain storage conditions, and Article 49 of the Drug Administration Law stipulates that expired drugs shall not be used. When a drug exceeds its expiration date, its intrinsic structure, composition and clinical potency will change, mostly for reduced efficacy, and a few highly toxic drugs will be more toxic as a result. The World Health Organization classifies expired drugs under the category of unwanted drugs, which means that they should be disposed of immediately as pharmaceutical waste and should not be reused, so the use of expired drugs is strictly prohibited.