The primary CAS number for Lidocaine Hydrochloride, a widely utilized local anesthetic, is 73-78-9. This specific anhydrous form of Lidocaine Hydrochloride is predominantly employed in various pharmaceutical applications due to its effectiveness in blocking nerve signals in the body, which makes it invaluable in medical procedures that require localized pain relief. It is particularly noted for its rapid onset of action and relatively short duration of effect, which allows for precise control in surgical and diagnostic settings.

However, it is important to note that Lidocaine also exists in a monohydrate form, which is frequently utilized in topical and oral formulations. This monohydrate version has a different CAS number: 6108-05-0. The monohydrate form is often preferred for certain applications because it can enhance the solubility and stability of the drug in various formulations, making it suitable for creams, gels, and solutions designed for direct application to the skin or mucous membranes. This form is particularly beneficial in treating conditions such as localized pain, itching, and inflammation, and is commonly found in over-the-counter products as well as prescription medications.

In summary, while both forms of Lidocaine Hydrochloride serve crucial roles in the medical field, their differing physical characteristics and formulations allow healthcare professionals to choose the most appropriate version based on the specific needs of the patient and the intended route of administration. Understanding the distinction between the anhydrous and monohydrate forms, as indicated by their respective CAS numbers, is essential for pharmacists, clinicians, and researchers involved in the development and application of anesthetic therapies.

Key Identification Details:

• CAS Number (Anhydrous): 73-78-9

• CAS Number (Monohydrate): 6108-05-0

• Molecular Formula:

  (Anhydrous)

• Molecular Weight: 270.80 g/mol

• Formula (Monohydrate):