Soluprep (Chlorhexidine Gluconate 2% + Isopropyl Alcohol 70%)

What Is Soluprep and What Is It Used For?

Soluprep is a medicinal antiseptic solution presented in a sterile, single-use applicator. It combines two complementary antimicrobial agents: chlorhexidine gluconate, a cationic bisbiguanide antiseptic that binds to the outer layers of the skin and continues to kill microorganisms for hours after application, and isopropyl alcohol, a volatile solvent that rapidly denatures bacterial and fungal proteins and destroys many enveloped viruses within seconds. Together, they produce the combination of fast kill and persistent activity that modern surgical guidelines recommend for pre-operative skin preparation.

The applicator format has become the clinical standard because it delivers a consistent volume of solution, minimises cross-contamination between patients, reduces dripping and pooling, and incorporates a sponge head that gently exfoliates the stratum corneum and allows the antiseptic to reach the hair follicles and sebaceous glands, where commensal skin bacteria such as Staphylococcus epidermidis and Cutibacterium acnes reside. Many formulations contain a tint so that the treated area is clearly visible to the operating team, supporting aseptic technique and reducing the chance of missed sites.

Soluprep is not a therapeutic medicine in the traditional sense: it is not absorbed systemically in meaningful amounts from intact skin and it is not used to treat infections once they have occurred. Instead, it is an infection-prevention product whose clinical value is measured in the reduction of surgical site infections (SSI), catheter-related bloodstream infections (CRBSI) and peripheral line contamination. Large randomised trials and meta-analyses have shown that 2% chlorhexidine gluconate in 70% alcohol outperforms aqueous povidone-iodine for clean and clean-contaminated surgery and for central vascular access.

Approved Medical Uses

Soluprep is indicated for the disinfection of intact skin prior to a wide range of invasive procedures, including:

• Surgical skin preparation: Pre-operative antisepsis of the operative field before general, orthopaedic, cardiothoracic, vascular, gynaecological, obstetric and plastic surgery procedures.
• Central venous catheter (CVC) insertion: Skin antisepsis before insertion and at dressing changes of internal jugular, subclavian and femoral central lines, tunnelled catheters and implantable ports.
• Peripheral intravenous (PIV) access: Disinfection of the skin at peripheral cannulation, arterial line insertion, and venepuncture for blood sampling or blood culture collection.
• Regional and neuraxial anaesthesia: Skin preparation before peripheral nerve blocks. (For lumbar puncture and spinal or epidural anaesthesia, the choice of antiseptic and technique is strictly governed by local neuraxial protocols to avoid neurotoxic exposure of chlorhexidine to the meninges.)
• Minor procedures: Skin antisepsis before intra-articular and soft-tissue injections, skin biopsies, excision of cysts and lesions, and placement of subcutaneous devices.
• Interventional radiology and cardiology: Skin preparation before angiography, percutaneous drainage, pacemaker insertion and other image-guided interventions.
• Obstetric procedures: Skin disinfection before caesarean section, assisted delivery procedures and insertion of epidural catheters (in accordance with local neuraxial protocols).

Outside the operating theatre, similar chlorhexidine-alcohol formulations are used in intensive care units, emergency departments, outpatient clinics and pre-hospital care. The specific indications for Soluprep may vary by country and by the marketing authorisation held in each jurisdiction; healthcare professionals should always follow the product information approved in their region and their local infection-prevention policy.

What Should You Know Before Using Soluprep?

Soluprep is a potent antiseptic intended for controlled use on intact skin. Before application, the operator must assess the patient, identify any risk factors for adverse effects, and select an appropriate alternative where necessary. The patient or a responsible carer should be asked specifically about previous reactions to chlorhexidine, alcohol-based preparations, iodine and latex, since chlorhexidine allergy is increasingly recognised and can be severe.

Contraindications

Soluprep must not be used in the following circumstances:

• Known hypersensitivity: A documented allergy or previous hypersensitivity reaction to chlorhexidine (including chlorhexidine used in mouthwash, wound dressings, urinary catheters, impregnated central lines or over-the-counter antiseptics), to isopropyl alcohol, or to any of the other listed excipients such as the colouring agent.
• Pre-term neonates and newborns under 2 months: Routine use on extremely immature skin is not recommended unless specifically authorised by local neonatal protocol, because of the risk of chemical burns, contact dermatitis and significant percutaneous absorption.
• Use inside body cavities: Soluprep must not be used in the middle or inner ear, in the eye, on the meninges or inside the mouth, nose, urethra, vagina or rectum, where chlorhexidine and/or alcohol may cause severe tissue damage.
• Application to large burns, major wounds or deep open injuries: Broken skin and exposed tissues may allow significant systemic absorption of chlorhexidine and severe local irritation from the alcohol component.

When a patient has a documented chlorhexidine allergy, an alternative antiseptic (typically povidone-iodine 10% or, where appropriate, octenidine-alcohol) should be selected, and the allergy should be clearly recorded in the patient's medical notes, medication chart and allergy wristband.

Warnings and Precautions

Several clinically important precautions must be observed when using Soluprep:

• Flammability and surgical fire risk: Isopropyl alcohol 70% is highly flammable. Surgical fires have been reported when electrocautery, laser, fibre-optic light sources, drills or defibrillators have been used before the solution has fully evaporated. Allow at least 3 minutes drying time on dry, hairless skin, and longer on hairy or moist sites. Never allow solution to pool on, around or beneath the patient or on drapes. Remove any alcohol-soaked swabs and gauze before the procedure starts.
• Chemical burns from pooling: Prolonged contact between wet Soluprep and the skin, particularly under occlusive drapes, tourniquets, diathermy plates, gel pads or the patient's own body weight, can produce painful first- to third-degree chemical burns. This risk is higher in neonates and in lengthy procedures. Ensure the solution has completely dried and that no pooling has occurred before draping.
• Neurotoxicity: Chlorhexidine is neurotoxic when it contacts the meninges, the middle/inner ear, or the eye. Use during neuraxial procedures (spinal, epidural, lumbar puncture) must follow strict local protocols that limit the volume applied, allow full drying, and prevent dripping or aerosol contamination of equipment or gloves that will touch the sterile field.
• Eye and ear exposure: Chlorhexidine can cause serious corneal injury and permanent visual impairment. Accidental exposure of the eye requires immediate, prolonged irrigation and urgent ophthalmological review. Exposure to the middle or inner ear (for example following a perforated tympanic membrane) has been associated with ototoxicity.
• Open wounds and mucous membranes: Do not apply to genitalia, mucous membranes, or through perforated eardrums. Chlorhexidine exposure of genital mucosa has been associated with irritation and sensitisation.
• Anaphylaxis: Although uncommon, IgE-mediated anaphylactic reactions to chlorhexidine have been well documented, particularly when chlorhexidine is absorbed through mucosa or through prior sensitisation (for example from impregnated central venous catheters). Always check history and keep resuscitation equipment available.
• Neonates and pre-term infants: The immature stratum corneum of neonates, particularly those below 32 weeks gestational age, absorbs chlorhexidine more readily and is more prone to chemical burns. Where chlorhexidine-alcohol is used in neonatal intensive care, it is used sparingly, not allowed to pool, and often removed with sterile water after the procedure.
• Interference with laboratory and imaging tests: Soluprep may contain a colouring agent that can temporarily stain the skin, drapes and theatre linen. The residue does not typically interfere with wound healing but should be wiped off after the procedure in paediatric patients.
• Infants' protective equipment: Take care to protect the patient's eyes and ears with sterile gauze or plastic drapes when prepping the face and head.
• Anionic incompatibility: Do not use simultaneously with anionic soaps, hypochlorite bleach, iodine-based products or hydrogen peroxide on the same area, because these agents inactivate chlorhexidine and may produce skin staining or irritation.

Pre-Procedure Allergy Check

Chlorhexidine is one of the most rapidly growing causes of perioperative allergic reactions. Before Soluprep is applied, the pre-operative checklist should explicitly ask the patient about previous reactions to any chlorhexidine-containing product, including antiseptic hand rubs and wipes, mouthwashes, oral sprays, dental gels, wound dressings and impregnated catheters. A documented chlorhexidine allergy must be communicated to the entire operating team, labelled clearly in the medical record, and the product replaced with an approved alternative.

Children and Adolescents

Soluprep is typically considered appropriate for children aged 2 months and older, in line with the specific national marketing authorisation. In infants younger than 2 months, in preterm infants, and in neonates with significant skin fragility (for example infants with epidermolysis bullosa), the risks of chemical burns, contact dermatitis and systemic absorption are higher, and alternative agents or reduced volumes are often chosen. Where Soluprep is used in paediatric practice, careful attention must be paid to minimising the volume applied, avoiding pooling, and removing residue after the procedure.

Pregnancy and Breastfeeding

If you are pregnant, breastfeeding, think you may be pregnant, or are planning to have a baby, tell the clinical team before the procedure. Topical application of Soluprep to intact adult skin leads to negligible systemic absorption of chlorhexidine, and the isopropyl alcohol component evaporates almost entirely before it can be absorbed. Consequently, Soluprep is considered compatible with pregnancy and breastfeeding when used on intact skin for its intended purpose.

Pregnancy: Clinical use of chlorhexidine-alcohol for skin antisepsis before caesarean section is routine and is supported by large randomised trials showing reduced post-caesarean surgical site infections compared with povidone-iodine. The product should not be applied to the vaginal mucosa or used for vaginal cleansing during labour unless a specifically approved chlorhexidine vaginal preparation is indicated.

Breastfeeding: Soluprep should not be applied to the breasts or nipples immediately prior to breastfeeding. If surgical skin preparation is required in the breast area, the residue should be wiped away with sterile water before the infant feeds to avoid oral exposure.

Driving and Operating Machinery

Soluprep does not affect the ability to drive or operate machinery. However, if Soluprep is used in connection with a procedure performed under sedation or general anaesthesia, the anaesthetic itself — not the antiseptic — will determine when driving and operating machinery is safe again. Follow the specific discharge instructions from your anaesthetist or surgical team.

Important Information About Excipients

Isopropyl alcohol: 70% v/v isopropyl alcohol is the solvent and a major antimicrobial component. It is highly flammable, has a characteristic odour, and may transiently sting when applied to skin that has been shaved, waxed or abraded. Extensive or prolonged skin exposure may cause local drying and irritation.

Colouring agent: Many formulations of Soluprep contain a tint that temporarily stains the skin to indicate the treated area. This staining usually fades within 24 hours after washing with soap and water. Rarely, colouring agents may cause localised irritation.

How Does Soluprep Interact with Other Drugs and Products?

Unlike orally or intravenously administered medicines, Soluprep does not enter the systemic circulation in meaningful amounts after use on intact skin, so it does not have the hepatic metabolism- or transporter-based drug interactions seen with systemic drugs. Its interactions are predominantly chemical incompatibilities — substances that neutralise or displace chlorhexidine from its target on the skin — and physical interactions with other topical products, adhesives or equipment used at the application site.

Major Interactions (Chemical Incompatibilities)

Other Notable Interactions

Healthcare professionals should nonetheless take a thorough history of all topical products the patient has been using on the planned application site, including over-the-counter antiseptics, dressings, moisturisers, herbal topical preparations and home remedies. Any product that might inactivate chlorhexidine, form a physical barrier, or trigger allergic reactions should be cleansed from the skin before Soluprep is applied.

What Is the Correct Way to Apply Soluprep?

Soluprep is always applied by a trained healthcare professional in a clinical setting. Unlike oral or injectable medicines, it does not have a "dose" expressed in milligrams; instead it is dosed by application technique, contact time and surface area. The single-use applicator is designed to deliver the correct volume (typically 10.5 mL, 26 mL or other approved sizes depending on the applicator) for a defined preparation area. Using more applicators than required increases the risk of pooling and adverse effects without improving antiseptic efficacy.

Standard Application Technique

The following is a general technique based on international skin-prep guidelines. Always follow the instructions for use of the specific Soluprep product and your local infection-prevention protocol.

1. Prepare the skin: Ensure the skin is clean, dry and free of visible dirt, debris, exudate or skin products. Clip (do not shave) excess hair as needed. Cover adjacent mucous membranes, eyes and ears.
2. Activate the applicator: Hold the applicator sponge-side down and squeeze the wings of the chamber to release the solution into the sponge. Gently press the sponge against the skin to initiate flow.
3. Apply to dry sites (e.g. abdomen, chest, extremities): Using gentle back-and-forth strokes, prep the area for at least 30 seconds. Cover the target area plus a margin sufficient for any planned extension of the incision.
4. Apply to moist sites (e.g. inguinal fold, axilla, perineum): Prep for a full 2 minutes to account for the higher natural microbial load.
5. Allow to dry completely: Do not wipe, blot, fan or accelerate drying with any device. Wait a minimum of 3 minutes on dry, hairless skin and longer on hair-bearing skin. Confirm that no solution has pooled in skin folds, under the patient or on drapes.
6. Verify before proceeding: As part of the surgical safety checklist, confirm the skin is dry and flammable residue is absent before using electrosurgery, lasers, drills or defibrillators.

Adults

In adults, the choice of applicator size is determined by the planned preparation area:

Children

In children aged 2 months and above, Soluprep is applied using the smallest applicator appropriate for the surgical field. The volume used should be the minimum required to achieve an even film over the target area; excess solution should be prevented from pooling under the child or under drapes. Full drying time must be strictly observed before draping or any use of electrosurgical devices.

Neonates and Preterm Infants

Use in neonates (under 2 months of age) and especially in preterm infants (less than 32 weeks gestational age) requires particular care and is governed by local neonatal intensive care protocols. Routine application of chlorhexidine-alcohol to extremely premature skin is not recommended, and many units use dilute (0.5%) chlorhexidine, octenidine or povidone-iodine alternatives. Where Soluprep or an equivalent chlorhexidine-alcohol product is used, the minimum effective volume is applied, excess is blotted or removed, and the skin is typically rinsed with sterile water after the procedure. Close observation for chemical burns and contact dermatitis is mandatory.

Elderly

No specific dose adjustment is required for elderly patients. However, older skin may be more fragile, and prolonged contact with alcohol-based preparations can cause dryness, irritation or chemical burns, particularly under occlusive drapes. Avoid pooling and ensure complete drying before draping.

Special Sites

Preparation of the face, ears, periorbital area, perineum and genitalia demands additional precautions:

• Face and eyes: Protect the eyes with sterile gauze, drapes or watertight seals. If Soluprep enters the eye, irrigate immediately with copious sterile saline or water for at least 15 minutes and seek ophthalmology review.
• Ears: Plug the ear canal with cotton or gauze. Chlorhexidine in the middle or inner ear may cause ototoxicity.
• Neuraxial procedures: Follow a strict "apply, dry, discard" technique; remove solution from the fingertips before handling needles. Do not drip solution into epidural or spinal equipment.
• Perineum and genitalia: Use a designated vaginal or perineal chlorhexidine preparation where appropriate; Soluprep is not indicated for intra-vaginal use.

Missed Dose

Because Soluprep is applied immediately before an invasive procedure, missed doses are not a relevant concept. If skin preparation has been inadequate (too brief, interrupted by contamination, or wiped off before drying), repeat the application with a fresh applicator using the full recommended technique.

Overdose

Overdose in the traditional sense is rare with topical application to intact skin. However, excessive volumes, repeated applications, prolonged wet contact, or pooling under drapes or tourniquets can produce local chemical burns, contact dermatitis and, rarely, significant percutaneous absorption. In neonates, excessive volumes may cause hypothermia from rapid alcohol evaporation as well as chemical burns. Treatment is primarily supportive: the skin should be rinsed with sterile water, burns dressed according to burn-care principles, and allergic reactions managed as any other acute hypersensitivity reaction.

Accidental ingestion of Soluprep can cause alcohol intoxication and chlorhexidine irritation of the oropharynx and gastrointestinal tract. Do not induce vomiting; seek urgent medical advice and, where available, contact your regional poison-information centre.

What Are the Side Effects of Soluprep?

Soluprep is applied once, briefly, to intact skin, which means that the majority of patients do not experience any adverse effects. The side-effect profile is therefore very different from that of systemically administered medicines. The most common adverse effects are localised skin reactions; the most concerning but rare adverse effects are chemical burns, eye injury and chlorhexidine hypersensitivity reactions. Frequency categories below follow the standard European Medicines Agency (EMA) scheme for medicinal products.

Chlorhexidine Hypersensitivity

Chlorhexidine is now recognised as one of the most important causes of intraoperative anaphylaxis. Sensitisation usually occurs through prior exposure, often from seemingly innocuous sources such as oral hygiene products, chlorhexidine-impregnated central venous catheters, urinary catheters and wound dressings. Once sensitised, patients may react within minutes of skin, mucosal or intravenous exposure. Reactions during surgery are particularly dangerous because the patient is under anaesthesia and classical symptoms such as urticaria may be hidden by drapes. All clinical teams should be alert to unexplained intraoperative hypotension, bronchospasm or cardiovascular collapse, and include chlorhexidine exposure in the differential diagnosis. Investigation typically requires specific IgE testing and/or skin-prick testing at a specialist allergy clinic.

Chemical Burns

Chemical burns from chlorhexidine-alcohol products are preventable and are one of the most common serious local complications. They result from prolonged contact between the wet antiseptic and the skin, typically:

• Under occlusive drapes that prevent alcohol evaporation
• Under pneumatic tourniquets, diathermy plates or gel pads
• Beneath the patient's body weight (in the natal cleft, popliteal fossa, under breasts or in inguinal folds)
• On the fragile skin of neonates and preterm infants
• On skin that has been shaved rather than clipped, where microabrasions accelerate absorption

Burns present as painful erythema, blistering or full-thickness skin loss, sometimes not recognised until drapes are removed at the end of the procedure. Management follows standard burn-care principles with cleansing, non-adherent dressings and pain relief; deep burns may require specialist burns review.

Surgical Fire

Surgical fires involving alcohol-based skin preparations are rare but life-threatening. The majority occur on or around the head and neck, where the combination of oxygen-enriched atmospheres, drapes, hair and ignition sources (electrosurgery, lasers, fibre-optic headlights) creates the fire triangle. Prevention requires strict drying times, removal of soaked materials, and formal pause-and-check steps before any heat source is activated. If a fire occurs, immediate priorities are to stop the flow of oxygen, extinguish the fire with saline or a CO₂ extinguisher, remove drapes, assess the patient for burns and airway involvement, and preserve evidence for investigation.

When to Seek Medical Attention

Non-urgent, mild local irritation usually resolves within a few days without treatment. If a localised rash persists, spreads, blisters or becomes infected, it should be reviewed by a healthcare professional, and the reaction should be documented in the medical record as a possible chlorhexidine hypersensitivity for future anaesthetic planning.

Reporting Side Effects

If you experience any side effects following a procedure where Soluprep or another chlorhexidine-alcohol antiseptic was used, tell your doctor, pharmacist or nurse. Side effects can also be reported directly to the national pharmacovigilance authority. By reporting side effects, you help provide more information on the safety of this medicine.

How Should Soluprep Be Stored?

Soluprep is typically stored and handled by healthcare professionals in hospital pharmacies, operating-theatre stores, emergency departments and outpatient clinics. The following information applies to correct storage and to the handling of the product in any healthcare setting.

General Storage Conditions

• Store below 25°C (77°F) in the original, sealed foil or plastic packaging.
• Protect from direct sunlight and high temperatures.
• Do not freeze; freezing may damage the applicator and affect solution integrity.
• Do not store the product near heaters, open flames, sparks, or strong oxidising agents.
• Keep out of the sight and reach of children.
• Do not use after the expiry date (EXP) printed on the packaging. The expiry date refers to the last day of the stated month.

Flammability – Storage and Transport

Because Soluprep contains 70% v/v isopropyl alcohol, it is classified as a flammable liquid under international transport and storage regulations. Healthcare facilities should:

• Limit quantities stored in clinical areas to what is needed for routine use.
• Hold bulk stock in a dedicated flammable-liquid cabinet or store, in accordance with national fire and safety regulations.
• Ensure that staff who handle and transport the product are trained in fire safety and in the management of alcohol spills.
• Maintain adequate ventilation in storage areas, since alcohol vapours are heavier than air and can accumulate near the floor.

Single-Use Design

Each Soluprep applicator is a sterile, single-use device. The solution must not be poured into galley-pots, open trays, syringes or other containers, because this:

• Breaks the chain of sterility and introduces microbial contamination.
• Creates open reservoirs of flammable liquid in the operating field.
• Invalidates the manufacturer's licensed use and quality assurance.

Once an applicator has been activated, it should be used immediately for the intended single procedure and then disposed of. Unused or partially used applicators must not be stored for later use on other patients.

Disposal

Used applicators should be disposed of as clinical waste in accordance with local regulations. Bulk spills of solution should be absorbed with an inert absorbent material, all ignition sources removed, and the area ventilated. Medicines should not be disposed of via wastewater or household waste; healthcare facilities should follow their hazardous-waste policy to protect the environment. Patients and carers who come into possession of unused applicators should return them to a pharmacy for safe disposal.

What Does Soluprep Contain?

Understanding the complete composition of Soluprep is important for healthcare professionals evaluating potential hypersensitivity, for patients with known allergies, and for those involved in the storage and handling of flammable antiseptic products.

Active Ingredients

Each millilitre of Soluprep cutaneous solution contains:

• Chlorhexidine gluconate 20 mg/mL (equivalent to 2.0% w/v). Chlorhexidine gluconate is a cationic bisbiguanide antiseptic that binds strongly to the negatively charged stratum corneum and to microbial cell walls, disrupting membrane integrity and precipitating intracellular contents. It has a broad spectrum of activity against Gram-positive bacteria, most Gram-negative bacteria, yeasts and some enveloped viruses, and delivers residual activity on the skin for hours after application.
• Isopropyl alcohol 0.7 mL/mL (equivalent to 70% v/v). Isopropyl alcohol is a volatile antimicrobial solvent that rapidly denatures proteins and dissolves lipid membranes, producing fast kill of vegetative bacteria, fungi and enveloped viruses. At 70% concentration it is more effective than higher concentrations because sufficient water is available to support protein denaturation.

Inactive Ingredients

The remaining 28–30% of the formulation is made up of purified water and pharmaceutical excipients. Depending on the market and presentation, these may include:

• Purified water, as the aqueous vehicle
• A colouring agent (such as a blue or pink tint), so that the prepared skin area is visible to the surgical team and so that the team can verify full coverage
• Emollient or film-forming excipients in some formulations, to help deliver a uniform film

Consult the approved product information for the exact qualitative composition in your jurisdiction. Patients with a known allergy to a specific excipient should share this information with the clinical team so that an alternative antiseptic can be selected.

Appearance and Packaging

Soluprep is supplied as a clear to tinted, free-flowing solution housed inside a single-use sealed applicator. The applicator includes:

• A rigid outer chamber containing the solution reservoir
• A flexible sponge head that delivers solution to the skin and provides mild mechanical exfoliation
• A snap mechanism that releases the solution into the sponge when activated
• A protective cap that maintains sterility until just before use

The applicator is packaged in a foil pouch within an outer carton. Each carton contains multiple single-use applicators together with instructions for use. Do not use if the applicator, pouch or solution show signs of damage, discolouration or contamination.

What Is the Evidence Base for Soluprep?

Over the past two decades, chlorhexidine-alcohol combinations have become the most intensively studied pre-operative skin antiseptics. The landmark Darouiche et al. trial published in the New England Journal of Medicine in 2010 demonstrated that pre-operative skin preparation with 2% chlorhexidine gluconate in 70% isopropyl alcohol significantly reduced the overall incidence of surgical site infections compared with aqueous povidone-iodine in clean-contaminated surgery. Subsequent trials in caesarean section, cardiac surgery and vascular access have largely confirmed these findings, and meta-analyses have consistently supported chlorhexidine-alcohol as the preferred agent for most adult surgical procedures.

For central venous catheter insertion, the Mimoz et al. trial and the CLEAN 3 trial showed that chlorhexidine-alcohol reduced catheter-related bloodstream infection and catheter colonisation compared with povidone-iodine-based preparations. The current recommendations of the US Centers for Disease Control and Prevention (CDC), the UK National Institute for Health and Care Excellence (NICE), the Infectious Diseases Society of America (IDSA) and the World Health Organization (WHO) therefore place 2% chlorhexidine gluconate in 70% alcohol at the top of the hierarchy for skin antisepsis in most adult patients without chlorhexidine contraindications.

Important gaps and qualifications in the evidence base remain. The benefit of chlorhexidine-alcohol over povidone-iodine is smaller in contaminated and dirty surgery, and head-to-head data are limited in some high-risk populations such as patients with extensive burns or severe skin disease. Neonatal evidence is still evolving, and many units continue to favour dilute chlorhexidine or alternative antiseptics for preterm infants. Finally, rare but serious risks — chlorhexidine anaphylaxis and surgical fires — underline that the product must always be used in line with the local infection-prevention protocol and the surgical safety checklist.