A<unk>  is a drug that causes reversible local anesthesia and a loss of nociception.  When it is used on specific nerve pathways (nerve block), effects such as analgesia (loss of pain sensation) and paralysis (loss of muscle power) can be achieved.
Clinical<unk> s belong to one of two classes: aminoamide and aminoester<unk> s. synthetic<unk> s are structurally related to cocaine. They differ from cocaine mainly in that they have no abuse potential and do not act on the sympathoadrenergic system, i.e. they do not produce hypertension or local vasoconstriction, with the exception of Ropivacaine and Mepivacaine that do produce weak vasoconstriction.<unk> s vary in their pharmacological properties and they are used in various techniques of local anesthesia such as:
Topical anesthesia (surface)
Infiltration
Plexus block
Epidural (extradural) block
Spinal anesthesia (subarachnoid block)
The<unk>  lidocaine (lignocaine) is also used as a Class Ib antiarrhythmic drug.
Local anesthetic
General anaesthetic
Analgesic
Local anesthesia
Steroid
Detergent
Antimicrobial
Radionuclide