Science
Mechanism of Action
As a cationic bisbiguanide, chlorhexidine's positively charged cation binds to negatively charged bacterial cell walls. This binding causes membrane disruption and cell death, or a bacteriostatic effect at lower doses.
Research
Clinical Evidence
High confidence0.2%
Key findings
- 01 0.06-0.2% solutions significantly reduced plaque and bleeding indices for peri-implant mucositis.
- 02 A 0.2% mouthwash demonstrated superior dental plaque prevention compared to 0.06-0.12% solutions.
- 03 0.5% or higher concentrations (in alcohol) significantly lowered surgical site infection rates.
Transparency
Dusting Analysis
Chlorhexidine is an active ingredient and preservative, not typically used for 'dusting' purposes.
The Formula
Formulation
Stability
Optimal stability and antimicrobial activity are within pH 5.0-7.0. Activity deteriorates at high or acidic pH, and aqueous solutions decompose above 70 °C.
Conflicts
- Anionic materials (e.g., borates, phosphates, chlorides) can cause precipitation.
- Organic compounds (e.g., fatty acids) may reduce its activity.
- Incompatible with strong oxidizing agents and acids.
Safety
Safety Profile
FDA warns of rare but serious allergic reactions (anaphylaxis) and chemical burns from higher concentrations. Concentrations of 2-4% can irritate skin; *in vitro*, cytotoxicity was observed even at 0.002%.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Effective antimicrobial agent but necessitates careful formulation due to potential cytotoxicity, irritation, and allergic reactions, even at low concentrations.
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References
Sources