About Cetylpyridinium chloride A cationic quaternary ammonium compound with strong bactericidal and resistance to fungi, Antiseptic agent, antiplaque and antigingivitis. Mechanism of Action of Cetylpyridinium chloride Cetylpyridinium chloride is an antiseptic which exhibits antimicrobial properties against a number of oral bacteria and fungi. It possesses antiplaque and antigingivitis properties.