Procaine Hydrochloride Powder CAS 1951-5-8

Procaine hydrochloride Powder (CAS:1951-5-8), chemically known as 2-diethylaminoethyl 4-aminobenzoate hydrochloride, is a foundational pharmaceutical compound that established the modern era of local anesthesia. It represents a critical milestone in medicinal chemistry. While its use in mainstream medical anesthesia has been largely superseded by longer-acting agents like lidocaine, Procaine hydrochloride Powder maintains significant and diverse applications in global markets. For pharmaceutical procurement specialists, it remains a vital API for specific formulations, a key intermediate in chemical synthesis, and a compound of interest in niche therapeutic and cosmetic areas. This profile provides a detailed technical and commercial analysis for informed sourcing decisions.

Like other local anesthetics, it works by reversibly blocking voltage-gated sodium channels on the nerve cell membrane. This blockade inhibits the generation and conduction of action potentials, leading to temporary loss of sensation (anesthesia) in the localized area. The sequence of sensory loss typically begins with pain, followed by temperature, touch, and deep sensation.

Advantages:​

• Relatively High Safety:​ Compared to cocaine, it has lower toxicity, a wider therapeutic index, and no addictive potential.
• Vasodilation:​ Procaine itself has a mild vasodilatory effect, which may increase local blood flow and accelerate its own absorption and removal from the site. This shortens its duration of action and increases the risk of systemic toxicity. Therefore, it is commonly combined with a small amount of a vasoconstrictor (such as epinephrine) in clinical use to constrict local blood vessels, slow absorption, prolong anesthesia duration, and reduce systemic toxicity.

Limitations:​

• Weak Anesthetic Potency: Its efficacy is lower than that of modern anesthetics like lidocaine.
• Slower Onset: It has relatively poor diffusibility and tissue penetration.
• Short Duration of Action: Even with the addition of epinephrine, its single-injection effect typically lasts only 45–60 minutes.
• Allergic Reactions:​ A small number of individuals may experience allergic reactions to its metabolite, para-aminobenzoic acid (PABA). PABA is also a structural component of some sulfonamide drugs, so caution is advised in patients allergic to sulfonamides.

For educational purposes only – not a substitute for professional medical advice.

Although procaine hydrochloride has largely been replaced by longer‑acting and more stable local anesthetics, it continues to be used in certain clinical settings, particularly where cost or historical practice remains a factor. Below is an overview of its traditional and limited contemporary applications.

Infiltration Anesthesia: Historically used for minor superficial procedures via subcutaneous or submucosal injection. In some regions, it may still be employed for small‑area infiltration.

Nerve Block Anesthesia: Previously common in dental procedures; its use in nerve blocks has diminished but can still be encountered in specific regions or clinical circumstances.

Spinal Anesthesia (Subarachnoid Block): Once utilized for short‑duration surgeries. Due to its brief duration of action, it has been largely replaced by longer‑acting agents.
Intravenous Regional Anesthesia (Bier Block): Occasionally used for limb surgeries, though this technique has declined with the availability of safer or more convenient alternatives.
 

Important Notice
Procaine hydrochloride is a prescription‑only drug. The information above is for educational and historical purposes only and does not constitute medical advice, diagnosis, or treatment  recommendations. Any use of this substance must be under the supervision of a licensed healthcare or veterinary professional.
 

Procaine hydrochloride Powder stands as a milestone in the history of local anesthetics. It ushered in an era of safe local anesthesia, and its chemical structure laid the foundation for the design of many subsequent ester-type anesthetics. Although its role in modern clinical practice has shifted from a "leading actor" to a "supporting character" in specific scenarios, it remains an indispensable classic drug in pharmacopoeias, an essential case study in medical education, and continues to hold value in veterinary medicine and certain specialized medical applications. Understanding procaine is not merely about learning about a single drug but also about revisiting the developmental journey of a pivotal technology in modern medicine.

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