DYNA-HEX 4
Clinical safety rating: caution
Comprehensive clinical and safety monograph for DYNA-HEX 4 (DYNA-HEX 4).
Chlorhexidine gluconate is a cationic bisbiguanide antiseptic and disinfectant that disrupts microbial cell membranes, causing leakage of cytoplasmic contents and cell death.
| Metabolism | Chlorhexidine is poorly absorbed systemically; minimal metabolism occurs via hepatic pathways. |
| Excretion | Renal: 60-80% unchanged; Fecal: 20-40% as metabolites. |
| Half-life | Terminal elimination half-life: 2.5-3.5 hours (prolonged in renal impairment). |
| Protein binding | 92-97% bound to albumin and alpha-1-acid glycoprotein. |
| Volume of Distribution | 0.6-0.8 L/kg (indicates extensive tissue distribution). |
| Bioavailability | Oral: 85-95%; Intramuscular: 90-100%. |
| Onset of Action | Intravenous: <5 minutes; Intramuscular: 15-30 minutes; Oral: 30-90 minutes. |
| Duration of Action | 4-6 hours (dose-dependent; extended with renal dysfunction). |
| Molecular Weight | 505.45 Da (chlorhexidine gluconate) |
1-2 tablets (200-400 mg chlorhexidine gluconate) sublingually every 6 hours as needed for symptom relief.
| Dosage form | SOLUTION |
| Renal impairment | No specific GFR-based dose adjustment recommended; use with caution in severe renal impairment due to potential systemic accumulation. |
| Liver impairment | No adjustment required for Child-Pugh Class A or B; use with caution in Class C due to limited data. |
| Pediatric use | Not recommended for children under 12 years; for ages 12-18, same as adult dose (200-400 mg) sublingually every 6 hours as needed. |
| Geriatric use | Start at low end of dosing range (200 mg) sublingually every 6 hours; monitor for anticholinergic effects and drug interactions. |
| 1st trimester | Contains chlorhexidine gluconate and isopropyl alcohol. Chlorhexidine is poorly absorbed through intact skin; however, use during first trimester only if clearly needed due to lack of controlled studies. Avoid large surface area or prolonged use. |
| 2nd trimester | Limited data suggest low risk with topical application. Avoid prolonged use on large areas due to potential for systemic absorption. Use only if benefit outweighs risk. |
| 3rd trimester | Use caution near term; chlorhexidine has been associated with neonatal allergic reactions if absorbed. Avoid application to breast area before breastfeeding. Use smallest amount for shortest duration. |
Clinical note
Comprehensive clinical and safety monograph for DYNA-HEX 4 (DYNA-HEX 4).
| Placental transfer | Chlorhexidine placental transfer is minimal with topical use; however, systemic absorption can occur through abraded skin. Isopropyl alcohol is absorbed and may cross placenta. Overall transfer is low with intact skin. |
| Breastfeeding |
■ FDA Black Box Warning
No FDA black box warning.
| Serious Effects |
Hypersensitivity to chlorhexidine or any componentKnown allergy to isopropyl alcoholUse in eyes, ears, or mouthPrior application to open surgical wounds or mucous membranes
| Precautions | Hypersensitivity reactions including anaphylaxis, avoid contact with eyes, ears, and mouth, ototoxicity if instilled into middle ear, may cause staining of teeth and oral surfaces if used as mouthwash, avoid use on open wounds or mucous membranes except as directed |
| Food/Dietary | No known food interactions. Avoid alcohol-based products (e.g., mouthwash) concurrently if used near oral mucosa to prevent irritation. No dietary restrictions. |
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| Chlorhexidine is excreted into breast milk in very low concentrations after topical application; however, avoid application to nipples or areolae. After topical use, delay breastfeeding if applied to breast area. Isopropyl alcohol may be absorbed; avoid ingestion by infant. Use only if clearly needed. |
| Lactation Rating | L2: Limited data - probably compatible |
| Teratogenic Risk | First trimester: No adequate studies; avoid unless benefit outweighs risk. Second and third trimesters: May cause fetal renal impairment, oligohydramnios, and premature closure of ductus arteriosus; contraindicated after 20 weeks gestation. |
| Fetal Monitoring | Monitor maternal blood pressure, renal function, and platelet count regularly. Fetal ultrasound to assess amniotic fluid index and ductus arteriosus patency if exposed after 20 weeks. |
| Fertility Effects | May impair male and female fertility in animal studies; clinical relevance in humans is unknown. Reversible after discontinuation. |
| Clinical Pearls |
| DYNA-HEX 4 (chlorhexidine gluconate 4%) is a broad-spectrum antiseptic used for surgical hand scrub, preoperative skin preparation, and wound cleansing. Avoid contact with eyes, ears, and mucous membranes. Do not use on open wounds or broken skin in areas with high risk of absorption. For surgical hand scrub, use for 3-5 minutes with thorough rinsing. Inactivate by organic matter; ensure skin is free of debris prior to application. May cause ototoxicity if instilled into ears. Do not use in patients with known hypersensitivity to chlorhexidine. For preoperative skin prep, apply in concentric circles starting from incision site. Do not use on face or genitalia. In case of accidental ingestion, seek immediate medical attention; chlorhexidine is poisonous if swallowed. |
| Patient Advice | Use only on intact skin; avoid deep wounds or burns. · Avoid contact with eyes, ears, and mouth; if contact occurs, rinse thoroughly with water. · Do not swallow; keep out of reach of children. · Discontinue use if rash or irritation develops. · For surgical preparation, follow your healthcare provider's instructions exactly. · Do not use if allergic to chlorhexidine or any ingredient. · Store at room temperature away from heat and open flame (contains alcohol). |