These drugs inhibit the passage of nerve impulse from preganglionic neurons to postganglionic neurons
Classification depend upon of the mode of action
1. Competitive blockers
A. Quaternary ammonium compounds
Hexamethonium
Pentolinium
B. Amines
Mecamylamine
Pempidine
C. Monosulfonium compound
Trimethaphan camforsulfonate
11. Non competitive agents
Nicotine
Procaine
Hemicholinium
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