Soluprep Colored (Chlorhexidine 20 mg/ml + Isopropyl Alcohol 70%)

What Is Soluprep Colored and What Is It Used For?

Soluprep Colored is a ready-to-use, alcohol-based skin antiseptic that combines chlorhexidine gluconate 20 mg/ml (2 %) with isopropyl alcohol 70 % v/v and a visible colorant. It is applied to intact skin to reduce the microbial load before surgical incisions, vascular access and other invasive procedures.

Soluprep Colored belongs to the class of cutaneous antiseptics and disinfectants. Within the WHO Anatomical Therapeutic Chemical (ATC) classification it is grouped under D08AC (biguanides and amidines) as a chlorhexidine combination product. The formulation pairs two complementary antimicrobial agents: chlorhexidine gluconate, a cationic bisbiguanide with broad-spectrum activity and persistent substantivity on the skin, and isopropyl alcohol, a rapid-acting agent that denatures microbial proteins and dissolves lipid membranes within seconds of contact.

The primary indication for Soluprep Colored is pre-operative antisepsis of the patient’s skin. This includes preparation before clean and clean-contaminated surgical procedures, placement of peripheral and central venous catheters, arterial lines, epidural and spinal injections, chest drains, joint aspirations, lumbar puncture and similar invasive interventions performed on intact skin. By dramatically reducing the transient and resident microbial population at the incision site, the product contributes to the prevention of surgical site infections (SSIs) and catheter-related bloodstream infections (CRBSIs), which remain among the most common and costly healthcare-associated infections worldwide.

Landmark clinical evidence — including the pivotal Darouiche trial published in the New England Journal of Medicine in 2010 and subsequent Cochrane reviews — has shown that alcoholic chlorhexidine solutions reduce the rate of surgical site infection compared with aqueous povidone-iodine for many procedures. International guidelines from the WHO Global Guidelines for the Prevention of Surgical Site Infection (2016, updated), the U.S. Centers for Disease Control and Prevention (CDC), the U.S. FDA, the National Institute for Health and Care Excellence (NICE) and the Association for Perioperative Practice therefore recommend alcohol-based chlorhexidine preparations as a first-line option for surgical skin antisepsis in adult patients.

The “colored” designation reflects the inclusion of a non-toxic dye that visibly tints the skin where the antiseptic has been applied. This visual cue is clinically important: it allows the surgical team to confirm uniform coverage of the operative field, reduces the risk of leaving untreated “skip areas”, and supports procedural checklists such as the WHO Surgical Safety Checklist. The tint typically fades or is removed during postoperative cleansing and does not alter the antimicrobial performance of the underlying chlorhexidine-alcohol solution.

Soluprep Colored is generally supplied in single-patient-use applicators or bottles in sizes such as 10 ml, 26 ml and 250 ml, allowing clinicians to select the appropriate volume for the procedure. It is intended for use by trained healthcare professionals in hospitals, outpatient clinics and other clinical settings and is classified as a prescription-only medicinal product in many jurisdictions; even where it is available without a prescription, it is primarily distributed through professional channels rather than consumer pharmacies.

What Should You Know Before Using Soluprep Colored?

Soluprep Colored must only be used on intact skin and never on mucous membranes, eyes, the middle or inner ear, or exposed neural tissue. Because it contains 70 % isopropyl alcohol, the product is flammable and must be fully dry before any electrosurgical equipment or open flame is used.

Careful patient assessment and strict adherence to application technique are essential before using Soluprep Colored. Healthcare professionals should review the patient’s allergy status, skin integrity and the planned procedure to determine whether an alcohol-based chlorhexidine solution is appropriate. If any of the contraindications below apply, an alternative antiseptic such as aqueous chlorhexidine or povidone-iodine should be considered.

Contraindications

Soluprep Colored must not be used in the following situations:

• Known hypersensitivity to chlorhexidine, isopropyl alcohol or any excipient, including previous anaphylaxis to chlorhexidine-containing products
• Application to the eyes, ears or mucous membranes: contact with the eye can cause corneal injury, and instillation into the middle or inner ear has been associated with irreversible ototoxicity and sensorineural hearing loss
• Exposure to neural tissue or meninges: chlorhexidine is neurotoxic when it contacts the central nervous system directly
• Application to open wounds, burns or severely damaged skin: systemic absorption is increased and local irritation is pronounced
• Premature neonates (particularly <32 weeks gestation) and infants younger than 2 months, due to an elevated risk of chemical burns; national guidelines vary and clinicians should consult local neonatal protocols

Patients with a history of any hypersensitivity reaction to chlorhexidine — including reactions to chlorhexidine-impregnated central venous catheters, chlorhexidine mouthwash, bladder irrigation solutions or over-the-counter products — should not receive Soluprep Colored. Chlorhexidine is now recognized as one of the more common causes of peri-operative anaphylaxis, and reactions can be severe and rapid in onset. The patient’s allergy history must be reviewed and documented before every procedure.

Warnings and Precautions

Several clinically important precautions apply to all alcohol-based chlorhexidine skin preparations. Adhering to them helps minimize the most frequent preventable complications: surgical fires, chemical burns and allergic reactions.

• Fire and ignition risk: Isopropyl alcohol vapour is highly flammable. The solution must be allowed to dry completely — typically at least 3 minutes on dry skin and longer on hair-bearing areas — before drapes are applied or any electrosurgical, laser, diathermy or ignition source is activated. Excess solution must not pool under the patient, under drapes or on the operating table
• Chemical burns: Prolonged skin contact with pooled chlorhexidine-alcohol solution, particularly under occlusive drapes or tourniquets, can cause first- to third-degree chemical burns. Absorbent materials should be used to remove any excess, and saturated linen, gowns or drapes should be replaced before skin prep continues
• Neonates and young infants: The skin of preterm and very young infants is more permeable; use should follow local neonatal protocols and typically a non-alcoholic or diluted alternative is preferred
• Sensitive anatomical sites: Avoid contact with the eyes, ear canal (especially with perforated tympanic membranes), nasal mucosa, oral cavity, genital mucosa and the area surrounding neuraxial injection sites
• Generalized skin disease: Use with caution in patients with severe eczema, psoriasis or other conditions that compromise the skin barrier
• Single-patient use: Single-use applicators must not be reused between patients. Any unused solution at the end of a procedure should be discarded in accordance with local waste disposal protocols

Staff applying Soluprep Colored should wear appropriate personal protective equipment, including sterile gloves. After application, the team should verify that the antiseptic has fully dried, that no pools remain, and that the drapes are not saturated with alcohol before proceeding. Ignoring these steps is a well-documented cause of operating-theatre fires, which the American Society of Anesthesiologists, the UK National Patient Safety Agency and the Swedish Patientsäkerhetsverket have all highlighted as preventable adverse events.

Pregnancy, Breastfeeding and Paediatric Considerations

Chlorhexidine gluconate is poorly absorbed through intact skin, and topical alcohol-based antiseptics have been used for decades in pregnant patients undergoing caesarean section and other procedures without any established association with teratogenic or foetotoxic effects. Nevertheless, routine caution applies. When Soluprep Colored is used on the skin before obstetric procedures, care should be taken to avoid vaginal exposure unless a specific obstetric antiseptic protocol applies, because mucosal absorption of both chlorhexidine and alcohol is greater than through intact skin.

In breastfeeding women, topical use on skin areas away from the breast is considered compatible with lactation. If the solution is applied to the chest or axillary region (for example, for central venous catheter insertion), the treated area should be allowed to dry completely and be carefully cleansed before the infant feeds, to minimize the risk of oral exposure to chlorhexidine residues.

In paediatric patients, the safety profile is broadly similar to adults from around 2 months of age onwards, although the risk of chemical burns is higher in younger infants. Use in premature neonates is associated with the highest risk of burns and systemic absorption and is not routinely recommended; units caring for neonates typically use lower-concentration or aqueous chlorhexidine products, and must follow local evidence-based guidelines.

How Does Soluprep Colored Interact with Other Drugs and Products?

Clinically important interactions with systemic drugs are rare because chlorhexidine and isopropyl alcohol are poorly absorbed through intact skin. The most relevant interactions are local and involve other topical products, soaps and competing antiseptics applied to the same skin area.

Because Soluprep Colored is applied to intact skin in a thin, drying layer, its systemic bioavailability is very low. Published pharmacokinetic studies consistently show that chlorhexidine penetration through intact stratum corneum is minimal and that blood levels after standard surgical skin preparation remain below the limit of quantitation in most patients. Clinically significant interactions with orally or intravenously administered drugs are therefore uncommon. Nonetheless, several topical incompatibilities are well established and can reduce antimicrobial efficacy if ignored.

Chlorhexidine is a cationic molecule whose antimicrobial activity depends on binding to negatively charged sites on microbial cell walls. As a result, it is inactivated by substances that neutralize its positive charge or compete for binding sites. The most common offenders are anionic surfactants (the active detergents in many soaps and shampoos) and certain anionic preservatives. For this reason, skin should ideally be free of soap residues before Soluprep Colored is applied, and the antiseptic should not be mixed with aqueous soaps on the same skin surface.

Combining different antiseptics on the same skin area is also generally avoided. Mixing Soluprep Colored with aqueous iodine-based preparations can produce localized precipitation, increased irritation and unpredictable changes in antimicrobial efficacy. When sequential application is necessary — for example, switching between agents for patients with specific sensitivities — skin should be allowed to dry and be wiped clean before the next product is applied.

Major Interactions

Minor Interactions and Cross-Reactivity

Minor incompatibilities are mainly of theoretical or cosmetic significance but are worth noting for clinicians who perform a large number of procedures. Chlorhexidine can stain fabric, silicone and some plastics, particularly when the tinted version is used or when the skin is exposed to sunlight after application. Silicone-based surgical instruments and certain catheter materials may discolour with repeated contact, although this is cosmetic rather than clinically relevant in the short term.

Chlorhexidine cross-reactivity with other biguanides, such as alexidine and polyhexanide, has been described in case reports. Patients with documented chlorhexidine allergy should therefore be evaluated carefully before being exposed to other biguanide-containing antiseptics. Allergologic testing and consultation with an allergy specialist can help guide future anaesthetic and procedural planning in these patients.

What Is the Correct Application of Soluprep Colored?

Soluprep Colored is applied to intact skin with a sterile applicator, gauze or sponge stick using back-and-forth strokes with gentle pressure for approximately 30 seconds on dry sites and 2 minutes on moist sites. Allow the solution to air-dry completely before draping or activating heat sources.

Because Soluprep Colored is a topical antiseptic rather than a systemically absorbed medicine, “dosing” refers to the volume and duration of contact rather than to milligrams per day. The correct application technique has been standardized through decades of research on surgical site preparation and is summarized in international perioperative guidelines. The goal is to achieve uniform, visible coverage of the operative field, allow adequate contact time for antimicrobial action, and ensure complete drying before any subsequent step.

Adult Application Technique

Children and Adolescents

Elderly Patients

Missed or Insufficient Application

If the skin does not develop the characteristic tint in certain areas, or if the application was visibly incomplete or interrupted, re-apply Soluprep Colored to the affected area using the same technique. It is better to prolong the preparation than to proceed with incomplete antisepsis. The tint helps the team identify these gaps visually, which is one of the key advantages of the colored formulation.

If the contact time was shorter than recommended, allow the remaining solution to remain on the skin and ensure the total contact time is adequate before drying. Proceeding with incomplete contact time increases the risk of surgical site infection, particularly in clean-contaminated procedures and in patients with additional risk factors such as diabetes, obesity or immunosuppression.

Over-Application and Accidental Exposure

What Are the Side Effects of Soluprep Colored?

Most patients tolerate Soluprep Colored well. The most frequent reactions are transient local skin reactions such as dryness, redness or itching. Serious reactions, including contact dermatitis, chemical burns and chlorhexidine-induced anaphylaxis, are uncommon but clinically important.

Topical antiseptics, including Soluprep Colored, are generally well tolerated, and most reactions are mild and self-limiting. The overall frequency of adverse reactions is difficult to quantify precisely because much of the clinical use occurs in operating theatres where mild effects are often not formally recorded. However, pharmacovigilance data from regulatory agencies (EMA, FDA and national authorities) have identified a consistent pattern of predictable reactions and a smaller but well-characterized set of serious adverse events.

Local reactions dominate the side-effect profile and typically involve the skin area where the antiseptic was applied. They are usually related to the combined drying effect of alcohol and residual chlorhexidine on the skin barrier. Serious systemic reactions, such as anaphylaxis, are rare but can be life-threatening and are of particular importance because chlorhexidine is now recognized as one of the leading causes of perioperative anaphylaxis, especially in settings where multiple chlorhexidine-containing products are used.

The side-effect frequencies below are based on the Council for International Organizations of Medical Sciences (CIOMS) convention adopted by the European Medicines Agency: very common (>1/10), common (1/100–1/10), uncommon (1/1,000–1/100), rare (1/10,000–1/1,000), and very rare (<1/10,000).

Healthcare professionals are encouraged to report suspected adverse reactions to their national pharmacovigilance authority — for example, the EMA EudraVigilance system in the European Union, the MHRA Yellow Card Scheme in the United Kingdom, or the FDA MedWatch programme in the United States. Reporting contributes to the continued safety monitoring of chlorhexidine-alcohol antiseptics and helps identify previously unrecognized risks, particularly for rare events such as anaphylaxis and surgical fires.

How Should Soluprep Colored Be Stored?

Store Soluprep Colored below 25 °C (77 °F) in the original container, tightly closed and away from heat, sparks and open flames. The product is a flammable liquid and must be handled and discarded according to hospital fire-safety and hazardous-waste procedures.

Correct storage of Soluprep Colored is essential both to maintain antimicrobial potency and to prevent fire and safety incidents. Isopropyl alcohol is classified as a flammable liquid (UN 1219, hazard class 3 in the United Nations system for the transport of dangerous goods), and the packaged product must be stored and transported in line with local regulations for flammable healthcare products. Hospitals typically store larger volumes in designated flammable-storage cabinets ventilated according to fire-code requirements.

The product should be kept at a controlled room temperature below 25 °C (77 °F). Avoid direct sunlight, prolonged storage in vehicles, and placement near heat sources such as radiators, sterilizers, autoclaves or electrical equipment. Extreme temperatures can alter the evaporation rate of alcohol, affect the stability of the colorant and chlorhexidine, or damage the packaging and applicator seal. In environments subject to high ambient temperatures, storage in air-conditioned areas is recommended.

Containers should remain tightly closed when not in use. For single-patient-use applicators and sachets, the integrity of the unit packaging should be verified before use; any applicator with a damaged seal, signs of leakage, discoloration or visible contamination should be discarded. Single-use applicators must not be re-used on a second patient, even if partially used, because this risks cross-contamination and is incompatible with the product licence.

Do not use Soluprep Colored after the expiry date printed on the packaging. The expiry date refers to the last day of that month. Although alcohol-based chlorhexidine is comparatively stable, the colorant and evaporation of alcohol in partially opened containers can gradually reduce both visibility and antimicrobial performance over time. Any unused solution at the end of a procedure should be discarded; the product is intended as a single-use item.

Disposal of unused Soluprep Colored should follow local hospital waste-management policies for flammable pharmaceutical waste. The product should not be poured down household drains or disposed of as general waste, both for environmental reasons (chlorhexidine has adverse effects on aquatic organisms) and for fire-safety reasons. In the community setting, any unused product should be returned to a pharmacy or clinical waste collection point for appropriate treatment.

What Does Soluprep Colored Contain?

Each millilitre of Soluprep Colored contains chlorhexidine gluconate 20 mg and isopropyl alcohol 0.7 ml (70 % v/v). The formulation also includes a visible colorant and purified water as excipients.

The active ingredients in Soluprep Colored are chlorhexidine gluconate (20 mg/ml, equivalent to 2 % w/v) and isopropyl alcohol (0.7 ml/ml, equivalent to 70 % v/v). Both substances are well-characterized antimicrobial agents with decades of clinical use, and their combination has been extensively studied in randomized controlled trials of surgical site preparation. The specific concentration of chlorhexidine — 2 % — is the same strength used in the Darouiche trial and referenced in CDC, WHO and NICE guidelines for surgical skin antisepsis.

Chlorhexidine gluconate is a cationic bisbiguanide that binds to the negatively charged components of bacterial cell walls and disrupts membrane integrity, leading to precipitation of cytoplasmic contents and cell death. At the 2 % concentration used in Soluprep Colored, chlorhexidine is bactericidal against most Gram-positive bacteria, Gram-negative bacteria, and many yeasts and lipid-enveloped viruses. It has limited activity against non-enveloped viruses and mycobacteria, which is why it is formulated with alcohol to broaden the antimicrobial spectrum.

Isopropyl alcohol (also called isopropanol or 2-propanol) at 60–90 % v/v denatures microbial proteins and dissolves lipid membranes, causing rapid cell death within seconds of contact. It is active against nearly all vegetative bacteria, enveloped viruses, fungi and mycobacteria, but does not kill bacterial spores. The 70 % concentration is widely regarded as optimal for skin antisepsis because it provides both antimicrobial action and sufficient residence time on the skin before evaporation.

The formulation also contains inactive ingredients (excipients) that support product function and appearance. Typical excipients include purified water (which together with alcohol provides the vehicle for chlorhexidine) and a food-grade or approved pharmaceutical colorant such as sunset yellow FCF (E110) or a similar dye, which produces the visible tint on the skin. Precise excipient composition may vary between strengths and pack sizes and is specified in the patient information leaflet and summary of product characteristics.

If you or your patient has a known hypersensitivity to azo-dye colorants, or a history of asthma or urticaria triggered by food colorants, inform the clinical team before the procedure. In such cases, a non-tinted chlorhexidine-alcohol preparation, a povidone-iodine alternative, or an aqueous chlorhexidine option may be more appropriate. The complete list of ingredients, excipients and any special warnings specific to the marketed pack is available in the Summary of Product Characteristics (SmPC) supplied with the product.

Frequently Asked Questions About Soluprep Colored