local anesthetic + saline

A combination of a local anesthetic and saline refers to a solution in which a local anesthetic agent (such as lidocaine, procaine, or similar) is diluted or mixed with sterile saline (sodium chloride solution). This mixture is commonly used for injection to achieve localized numbness during minor surgical, dental, or diagnostic procedures. The mechanism of action involves the local anesthetic blocking sodium channels on nerve fibers at the site of administration, thereby preventing the propagation of pain signals. Saline serves as an isotonic diluent that can help adjust the concentration and volume for safe and effective delivery[1][3][7]. In some cases, saline alone has been shown to provide mild anesthesia for superficial skin procedures[5]. The specific choice of local anesthetic determines additional pharmacological properties.