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Which of the following are natural local anesthetics?

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Which of the following are natural local anesthetics?

(a) Cocaine

(b) Benzocaine

(c) Benzyl alcohol

(d) Clove oil

The question was asked by my school principal while I was bunking the class.

Origin of the question is Mechanism of Action of Local Anesthetic in chapter Local & General Anesthetics, Opioid Analgesics, Drug Addiction and Drug Abuse of Drug Biotechnology

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Right answer is (a) Cocaine

The best I can explain: Natural anesthetic is cocaine. Due to its uses in drug abuse, this is not used anymore in practices. Synthetic nitrogenous local anesthetics are procaine, benzocaine, lignocaine, cinchocaine, bucricaine. Synthetic non-nitrogenous will be benzyl alcohol and propanediol. Clove oil, phenol, chlorpromazine can also be used as a local anesthetic.

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