INDICATIONS : PROCAINE
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Procaine is a local anesthetic drug of the amino ester group. It is used primarily to reduce the pain of intramuscular injection of penicillin, and it was also used in dentistry. Owing to the ubiquity of the trade name Novocain, in some regions procaine is referred to generically as novocaine. It acts mainly by being a sodium channel blocker.
Procaine is used less frequently today since more effective (and hypoallergenic) alternatives such as lidocaine (Xylocaine) exist. Prior to the discovery of procaine, cocaine was the most commonly used local anesthetic. Like other local anesthetics (with the exception of cocaine), mepivacaine, and prilocaine, procaine is a vasodilator, and is often coadministered with epinephrine for the purpose of vasoconstriction. Vasoconstriction helps to reduce bleeding and prevents the drug from reaching systemic circulation in large amounts. Also unlike cocaine, procaine does not have the euphoric and addictive qualities that put it at risk for abuse.
Procaine , an ester anesthetic, is metabolized in the plasma by the enzyme pseudocholinesterase through hydrolysis into para-amino benzoic acid (PABA), which is then excreted by the kidneys into the urine. Allergic reactions to procaine are usually not in response to procaine itself, but to PABA. About 1 in 3000 people have an atypical form of pseudocholinesterase, which does not hydrolyze ester anesthetics such as procaine, resulting in a prolonged period of high levels of the anesthetic in the blood and increased toxicity.
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What is Anesthesia? An anesthetic (anaesthetic), is a drug that causes anesthesia — reversible loss of sensation. They contrast with analgesics (painkillers), which relieve pain without eliminating sensation. These drugs are generally administered to facilitate surgery. A wide variety of drugs are used in modern anesthetic practice. Many are rarely used outside of anesthesia, although others are used commonly by all disciplines. Anesthetics are categorized in to two classes: general anesthetics, which cause a reversible loss of consciousness, and local anesthetics, which cause a reversible loss of sensation for a limited region of the body while maintaining consciousness. Combinations of anesthetics are sometimes used for their synergistic and additive therapeutic effects, however, adverse effects may also be increased.