About chlorhexidinea bisbiguanide antimicrobial agent, anti-infective, antiseptic.mechanism of action of chlorhexidinethis drug has positive charge so it attach to the negative charge cell wall. this destabilizes and destroys the integrity and penetrates bacterial cell membranes. it results precipitation of the cytoplasm and interferes with membrane function by inhibiting oxygen utilization leading to a decrease in cellular atp levels and cell death. in gram-negative bacteria, chlorhexidine affects the outer membrane allowing the release of periplasmic enzymes. the inner membrane of these organisms is not ruptured but the uptake of small molecules is impaired. at low concentrations chlorhexidine exhibits a bacteriostatic effect while at high concentrations it is bactericidal.