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Local Anesthetic: Lidocaine works by blocking nerve signals in the area where it is applied, providing temporary numbness and pain relief. It is commonly used to numb specific regions of the body during medical procedures, such as dental work, minor surgeries, and dermatological procedures.

Antiarrhythmic Medication: Lidocaine is also used intravenously as an antiarrhythmic medication. It helps to stabilize irregular heart rhythms and is often used in emergency situations or during cardiac procedures.

Duration of Action: Lidocaine provides temporary anesthesia when used as a local anesthetic, typically lasting for about one to two hours, depending on the dosage and the specific area being treated. When used as an antiarrhythmic medication, the effects may vary depending on the individual and the specific cardiac condition being treated.