CHLORAPREP ONE-STEP
Clinical safety rating: caution
Comprehensive clinical and safety monograph for CHLORAPREP ONE-STEP (CHLORAPREP ONE-STEP).
Chlorhexidine gluconate disrupts microbial cell membrane integrity and precipitates cytoplasmic contents, providing rapid bactericidal activity against a broad spectrum of gram-positive and gram-negative bacteria, as well as some fungi and viruses. Isopropyl alcohol denatures proteins and disrupts cell membranes, enhancing antimicrobial activity.
| Metabolism | Chlorhexidine is not significantly metabolized; it is excreted primarily unchanged in feces (via bile) and urine, with minimal systemic absorption following topical application. Isopropyl alcohol is metabolized by alcohol dehydrogenase to acetone, which is excreted renally and via exhalation. |
| Excretion | Chlorhexidine is primarily excreted unchanged in feces (>90%) after oral administration, with minimal renal excretion (<1%). After cutaneous application, negligible systemic absorption occurs, and any absorbed chlorhexidine is excreted renally as unchanged drug (<1% of dose). |
| Half-life | Chlorhexidine has a terminal elimination half-life of approximately 1-2 hours in plasma after intravenous administration in animal studies; however, after topical application, systemic levels are undetectable, making half-life clinically irrelevant. |
| Protein binding | Chlorhexidine is highly protein-bound (>80%), primarily to serum albumin and other plasma proteins, reducing free drug concentration. |
| Volume of Distribution | Due to negligible systemic absorption after topical use, Vd is not clinically relevant; after IV administration in animals, Vd is approximately 0.5-1.0 L/kg, indicating distribution into extracellular fluid. |
| Bioavailability | Topical (intact skin): <0.1% systemic bioavailability due to minimal percutaneous absorption; oral: 2-3% bioavailability due to poor gastrointestinal absorption; buccal: 30-40% via mucosal absorption. |
| Onset of Action | Topical: Immediate antimicrobial effect upon application, with rapid reduction of skin flora within 15 seconds to 2 minutes. |
| Duration of Action | Topical: Persistent antimicrobial activity for up to 6 hours on the skin; residual activity declines over 24 hours, with sustained suppression of bacterial regrowth for several days with repeated use. |
Apply chlorhexidine 2% and isopropyl alcohol 70% solution to the surgical site as a single preoperative skin preparation; no additional scrubbing or rubbing required.
| Dosage form | SPONGE |
| Renal impairment | No adjustment required for renal impairment; topical application results in negligible systemic absorption. |
| Liver impairment | No adjustment required for hepatic impairment; negligible systemic absorption. |
| Pediatric use | Apply same solution as a single preoperative application; no weight-based dosing needed; use sparingly and avoid pooling in neonates and infants due to risk of skin irritation and systemic absorption. |
| Geriatric use | No specific dose adjustment; use standard application; caution in thin/frail elderly to avoid excessive wetting and potential irritation. |
| 1st trimester | Consult provider |
| 2nd trimester | Consult provider |
| 3rd trimester | Consult provider |
Clinical note
Comprehensive clinical and safety monograph for CHLORAPREP ONE-STEP (CHLORAPREP ONE-STEP).
| Breastfeeding | Systemic absorption after topical application is minimal; excretion into breast milk is unlikely. The M/P ratio is not calculable due to negligible maternal plasma levels. Considered compatible with breastfeeding; avoid application to the breast area. |
| Teratogenic Risk | Chlorhexidine gluconate and isopropyl alcohol, the active components of CHLORAPREP ONE-STEP, are not systemically absorbed in significant amounts following topical application. Placental transfer is negligible. No teratogenicity observed in animal studies; fetal risk is not expected during any trimester. |
■ FDA Black Box Warning
WARNING: Do not use on open wounds, mucous membranes, or for lumbar puncture (risk of chemical meningitis). Avoid contact with eyes, ears, and mouth. Hypersensitivity reactions including anaphylaxis have been reported. For external use only.
| Serious Effects |
["Known hypersensitivity to chlorhexidine gluconate or isopropyl alcohol.","Use on open wounds, mucous membranes, or for lumbar puncture.","Use in eyes, ears, or mouth."]
| Precautions | ["Avoid contact with eyes, ears, and mucous membranes.","Do not use on open wounds or surgical wounds.","Can cause ototoxicity if instilled into the ear.","Hypersensitivity reactions (including anaphylaxis, urticaria, angioedema) may occur.","Fire hazard: flammable, keep away from open flame or heat sources.","Not for use in premature infants or neonates due to risk of skin irritation and systemic absorption.","Do not allow pooling of solution under patient (risk of chemical burns)."] |
| Food/Dietary | No known food interactions. Chlorhexidine and alcohol are not absorbed systemically in significant amounts. |
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| Fetal Monitoring | No specific maternal or fetal monitoring is required for topical use. Standard precautions for skin antisepsis apply. |
| Fertility Effects | No adverse effects on fertility or reproductive performance have been reported. Animal studies show no impact on fertility indices. |
| Clinical Pearls | CHLORAPREP ONE-STEP contains 2% chlorhexidine gluconate and 70% isopropyl alcohol. Apply using a back-and-forth motion for at least 30 seconds on intact skin. Allow to dry completely (approximately 3 minutes) before puncturing the skin. Do not use on mucous membranes, open wounds, or in contact with the brain, meninges, or middle ear. Avoid pooling of solution beneath the patient or in skin folds to prevent chemical burns. Do not use in patients with known hypersensitivity to chlorhexidine or alcohol. |
| Patient Advice | Do not apply to open wounds, eyes, ears, or mouth. · Allow the area to dry completely before any procedure. · Inform your healthcare provider if you have ever had an allergic reaction to chlorhexidine or alcohol. · Do not use if you are allergic to any ingredient in the product. · Keep away from heat and flame until dry. |