Chlorhexidine Safety Guidelines

Introduction to Chlorhexidine Safety

The American Society of Anesthesiologists recommends allowing chlorhexidine to dry completely before performing any injection or skin puncture to prevent serious neurological complications while maintaining optimal antimicrobial efficacy 1, 2, 3
Chlorhexidine is neurotoxic at concentrations as low as 0.01% when it contacts neural tissue directly, and cases of permanent paraplegia from chronic adhesive arachnoiditis have occurred when chlorhexidine contaminated the cerebrospinal fluid 4, 5

Allowing complete drying of chlorhexidine minimizes the risk of liquid chlorhexidine being carried into deeper tissues on the needle, and the alcohol component evaporates during drying, further reducing the volume of potentially neurotoxic solution 4, 5
Mathematical modeling demonstrates that when antiseptic is allowed to dry fully, the concentration that could reach the neuraxis becomes extremely low and safe 4

The American College of Surgeons recommends checking gloves for chlorhexidine contamination before proceeding with a procedure, and keeping chlorhexidine well away from drugs and equipment to be used for the procedure 1, 2, 3
The World Health Organization suggests covering or protecting equipment while applying the antiseptic to prevent contamination 1, 2, 3

For neuraxial procedures, the American Society of Regional Anesthesia and Pain Medicine recommends using 0.5% chlorhexidine in alcohol rather than 2% concentration given clear neurotoxicity evidence and lack of superior antimicrobial benefit 1, 2, 3
The risk of neurotoxicity, though rare, results in devastating permanent neurological injury when it occurs, and the American Academy of Neurology emphasizes the importance of taking particular care to avoid contact with neural tissue 5, 4