In what concentration is Benzalkonium chloride normally used for preoperative skin preparation and treatment of minor wounds?
Answer: (c) 1:750. Benzalkonium chloride is indicated for prophylaxis and treatment of skin infections. It is antimicrobial against a wide variety of bacteria, fungi and protozoa. A 1:750 concentration of benzalkonium chloride is used for preoperative skin preparation, treatment of minor wounds, and lacerations, as a surgical scrub, and for sterilizing metallic instruments. The antimicrobial action of benzalkonium chloride is attributed to its ability to inactivate bacterial enzyme.