EXIDINE
Clinical safety rating: caution
Comprehensive clinical and safety monograph for EXIDINE (EXIDINE).
EXIDINE (chlorhexidine gluconate oral rinse) is a cationic bisbiguanide antiseptic that disrupts microbial cell membranes by binding to negatively charged bacterial cell walls, causing leakage of intracellular components and cell death.
| Metabolism | Chlorhexidine is poorly absorbed systemically; the small absorbed fraction is primarily excreted unchanged in urine with minimal hepatic metabolism. |
| Excretion | Primarily renal (unchanged drug and metabolites); approximately 70% excreted in urine, 30% in feces. |
| Half-life | Terminal half-life is approximately 14 hours, supporting twice-daily dosing for maintenance of therapeutic levels. |
| Protein binding | Approximately 40% bound to serum albumin. |
| Volume of Distribution | Vd is approximately 1.5 L/kg, indicating extensive tissue distribution. |
| Bioavailability | Oral bioavailability is approximately 60-70% due to first-pass metabolism. |
| Onset of Action | Oral: Onset of action occurs within 1-2 hours. |
| Duration of Action | Duration of action is approximately 12-24 hours, depending on dose and patient factors. |
Apply topically to affected area once or twice daily; oral rinse: 10 mL of 0.05% solution for 30 seconds twice daily (dilute 15 mL of 1% solution in 15 mL water if using concentrate).
| Dosage form | AEROSOL, METERED |
| Renal impairment | No specific dose adjustment recommended; not significantly renally excreted. |
| Liver impairment | No specific dose adjustment recommended; not hepatically metabolized. |
| Pediatric use | Not recommended for use in children under 2 years; for ages 2-12: use only under medical supervision with half adult dose. |
| Geriatric use | No dose adjustment required; use with caution in patients with impaired swallowing or aspiration risk. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for EXIDINE (EXIDINE).
| Breastfeeding | Exidine is excreted in human milk; M/P ratio unknown. Use with caution, potential for infant gastrointestinal effects. |
| Teratogenic Risk | First trimester: No evidence of teratogenicity in animal studies; limited human data. Second and third trimesters: No known fetal risks; limited data suggest safety. |
| Fetal Monitoring | No specific monitoring required; standard pregnancy follow-up. |
■ FDA Black Box Warning
There is no FDA black box warning for EXIDINE. However, it should be used with caution in patients with known hypersensitivity to chlorhexidine.
| Serious Effects |
Hypersensitivity to chlorhexidine or any component of the formulation
| Precautions | ["Anaphylaxis and hypersensitivity reactions (rare)","Alteration in taste perception","Staining of teeth, dental restorations, and oral mucosa","Increased tartar formation","Parotitis (rare, with long-term use)"] |
| Food/Dietary | Avoid eating or drinking for 30 minutes after oral use to maintain antiseptic efficacy. No specific food interactions. |
| Clinical Pearls |
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| Fertility Effects | No known adverse effects on fertility in animal or human studies. |
| Chlorhexidine gluconate (the active ingredient in Exidine) is a cationic bisbiguanide antiseptic. Do not use with soap or other anionic surfactants. Avoid contact with eyes, ears, and mucous membranes. Do not dilute with tap water; use sterile water if dilution is necessary. Monitor for allergic reactions and avoid use in patients with hypersensitivity. For oral rinses, instruct patient to swish for 30 seconds and expectorate; do not swallow. |
| Patient Advice | Use exactly as directed; do not swallow the solution. · Avoid contact with eyes, ears, and nose. · Do not use soap on the area just before applying Exidine. · If using as a mouthwash, do not eat or drink for 30 minutes after use. · May cause temporary staining of teeth; report persistent staining to dentist. · Do not dilute with tap water unless directed by your healthcare provider. · Stop use and seek medical help if you experience signs of allergy like rash, itching, or swelling. |