Chlorhexidine is an antibacterial used as an antiseptic and for other applications. Target: Antibacterial Chlorhexidine belongs to a group of medicines called antiseptic antibacterial agents. It is used to clean the skin after an injury, before surgery, or before an injection. Chlorhexidine is also used to clean the hands before a procedure. It works by killing or preventing the growth of bacteria on the skin.