Aceclofenac is a non-steroidal anti-inflammatory drug (NSAID) used to treat pain and inflammation in conditions such as arthritis. Aceclofenac impurities refer to any unwanted substances that may be present in the drug, either as a result of the manufacturing process or during storage. These impurities can affect the efficacy and safety of the drug and therefore must be monitored and controlled to ensure the quality of the medication.