Procaine hydrochloride, also known as Novocain or Procaine HCl, is a local anesthetic drug commonly used in various medical procedures to numb specific areas of the body. In the pharmaceutical industry, it can be referred to as 2-diethylaminoethyl 4-aminobenzoate hydrochloride or 4-amino-benzoic acid-2-(diethylamino) ethyl ester hydrochloride. Other synonyms for Procaine hydrochloride include dioctanoylcystine, procainamide, and procaine penicillin. Despite its many names, Procaine HCl remains a crucial element in modern medicine's local anesthesia toolkit, providing safe and effective pain relief to patients undergoing various medical or dental procedures.