Polidocanol

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Polidocanol

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Medically reviewed

Laura Arias

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Polidocanol

Defining Polidocanol: Identity and Chemical Classification

Polidocanol is a synthetic pharmaceutical compound primarily classified as a sclerosing agent. The active ingredient is formally known as Polidocanol, chemically synonymous with Lauromacrogol 400 or Polyoxyethylene lauryl ether. Within pharmaceutical classification systems, it is categorized as a sclerosing agent for local injection.

As an active ingredient, Polidocanol possesses a dual pharmacological property: it functions as a sclerosing agent while concurrently providing an inherent, localized anesthetic effect. This dual action is intended to assist with patient comfort during vascular procedures.

What is Polidocanol Made Of and How is it Administered?

Polidocanol is manufactured as a single-component product and is administered through intravenous injection. Its chemical structure as a non-ionic detergent allows it to act on the vessel wall by affecting the lipid structure of the endothelial cells. It is available as an injectable solution or a specialized injectable foam. The foam preparation allows the active ingredient to remain in contact with the vessel lining for an extended duration compared to the liquid solution alone.

General Purpose of a Sclerosing Agent

The essential general purpose of Polidocanol is to chemically induce the therapeutic closure and structural change of a targeted vessel. By causing controlled interaction with the endothelium, the compound initiates a localized process that results in the formation of internal scar tissue, known as fibrosis. This process is designed to eliminate blood flow through the targeted area, redirecting the circulation through adjacent vascular pathways.

Regulatory References

  1. Polidocanol (Asclera) - DailyMed (NIH)

What side effects are possible with Polidocanol?

Possible Side Effects and Safety Information

The safety profile of Polidocanol (Lauromacrogol 400) is structured around expected local reactions and the documented, though rare, potential for serious systemic events, as outlined in official regulatory documents. Adverse reactions are classified by frequency and grouped into System-Organ Classes (SOCs).


Frequency-Classified Adverse Reactions

The most commonly documented effects are related to the site of administration:

  • Very Common (Affecting 1 in 10 or more people): Injection site pain.
  • Common (Affecting up to 1 in 10 people): Skin hyperpigmentation (darkening of the skin), bruising (ecchymosis), and local clotting within the treated vein (injection site thrombosis).
  • Uncommon to Rare: The official label also notes less frequent effects such as superficial vein inflammation (thrombophlebitis), allergic skin reactions, or nerve injury. Deep Vein Thrombosis (DVT) is formally listed as a rare event.

Serious Adverse Reactions and Systemic Safety

Regulatory documents emphasize the risk of serious, though infrequent, systemic reactions, which fall under Vascular and Immune System Disorders:

  • Thromboembolic Events: Serious events documented include Pulmonary Embolism (PE) and Deep Vein Thrombosis (DVT), which are major safety considerations associated with the sclerosing action.
  • Severe Hypersensitivity: The possibility of Anaphylactic Shock, a severe systemic allergic reaction, requires observation immediately following administration.
  • Tissue Necrosis: Local tissue death has been reported following accidental injection into an artery or leakage outside the vein.

Population-Specific Safety Restrictions

Polidocanol use is formally restricted in certain patient groups or conditions. It is contraindicated in patients with a known allergy to the substance or with existing acute thromboembolic disease. Regulatory bodies also advise against use in patients with severe hepatic or renal impairment due to limited safety data in these populations.

Overdose and Emergency Response

Polidocanol Overdose Manifestations

The official regulatory documentation addresses overexposure, which may occur from using excessive volumes or concentrations. Documented local overdose presentations include a higher incidence of localized tissue necrosis and ulceration. In cases of unintended intra-arterial injection, the manifestations are severe, involving tissue ischemia and the potential for gangrene.

Severe Outcomes and Systemic Toxicity

Overexposure is associated with severe, life-threatening systemic outcomes affecting multiple systems. These documented manifestations include anaphylactic shock and severe allergic reactions. Serious cardiovascular and central nervous system events are also noted, such as cardiac arrest, myocardial infarction (MI), stroke (cerebrovascular accident), and pulmonary embolism (PE). An increased risk of developing thrombosis (DVT/PE) is specifically documented for certain populations, including those with reduced mobility or a history of thromboembolism.

When to Seek Immediate Medical Help

The regulatory labeling mandates specific emergency actions. Seek immediate medical attention for any signs suggesting a severe allergic reaction. Additionally, if intra-arterial injection is suspected, the official instruction is to consult a vascular surgeon immediately. While no specific antidote is documented, the procedural instruction is to be prepared to provide appropriate treatment for anaphylaxis.

Therapeutic Uses of Polidocanol

What Polidocanol Treats: Main Uses and Benefits

Polidocanol is commonly used to help with conditions marked by increased physiological stress from defective blood vessels, and is applied in addressing situations involving chronic venous disease and certain vascular anomalies.

The medication is relevant for easing symptoms related to vessel function in chronic venous disease, specifically targeting uncomplicated spider veins, reticular veins, and improving symptoms of superficial venous incompetence. It is also applied in addressing certain venous malformations and low-grade internal hemorrhoids.


Therapeutic Benefit

Polidocanol assists with reducing the overall symptom burden caused by venous pooling, which supports a more manageable experience of day-to-day comfort. The therapeutic benefit may contribute to improved comfort during periods of heightened symptoms, and may assist with maintaining functional stability. For symptomatic internal hemorrhoids, it helps manage bleeding and prolapse.

Quick Fact: Relief for Chronic Leg Heaviness Polidocanol may be part of symptomatic management for the aching, fatigue, and heavy sensations associated with venous insufficiency.

Eligibility and Restrictions for Use

Who Can and Cannot Use Polidocanol?

Polidocanol use is determined by official regulatory labeling, which establishes specific conditions for eligibility and absolute contraindications. The medicine is primarily intended for use in adult patients (18 years and older). Its safety and effectiveness have not been established in pediatric patients.


Official Eligibility Restrictions

Category Regulatory Status
Absolute Contraindications Prohibited for patients with a known allergy to polidocanol or acute thromboembolic diseases (e.g., deep vein thrombosis or pulmonary embolism).
Pregnancy and Lactation Should not be used during pregnancy. Use in nursing women should be avoided (manufacturer advises considering interrupting breastfeeding).

Conditional Use

Use requires special consideration for patients with certain pre-existing vascular conditions. This includes individuals with underlying arterial disease (such as marked peripheral arteriosclerosis) or those with factors that increase the risk of thrombosis, such as reduced mobility, a history of DVT/PE, or recent major surgery. These restrictions reflect the official regulatory focus on patient intrinsic risk factors and established use populations.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Polidocanol is primarily characterized by the explicit statement that comprehensive drug interaction studies were not performed for the injectable formulations.

Interaction Scope Official Regulatory Status (Based on FDA Prescribing Information)
Medicinal Product Categories with Documented Interactions None documented. Regulatory labels explicitly state that drug-drug interaction studies have not been conducted.
Specific Interacting Medicines None listed.
Mechanistic Basis of Interactions None documented. No data on pharmacokinetic mechanisms (e.g., CYP enzyme effects) are reported in the official interaction sections.
Timing-Based Interaction Rules None documented. No mandatory dose spacing requirements are listed for co-administration with other substances.
Interaction-Related Restrictions None documented. No restrictions on co-administration with other medicines, foods, or supplements are listed in the drug interaction section.

Interaction Classifications (High-Level)

Property Official Regulatory Status
Interaction Severity Classification Not Classified. Official labeling does not assign a severity classification to any co-administered drug.
Regulatory Basis United States Food & Drug Administration (FDA) Prescribing Information.
Interaction-Context Constraints No specific constraints related to food, alcohol, supplements, or herbal products are documented in the Drug Interactions section.

Resulting Interaction Structure

  • The Polidocanol injectable solution label formally states that no drug-drug interactions have been studied.
  • The Polidocanol injectable foam label explicitly confirms that no specific drug interaction studies have been performed.
  • Official documents for the foam formulation conclude there are no known drug interactions.

Connection to the overall interaction profile: The regulatory structure for Polidocanol is defined by the absence of documented interaction patterns. Because specific studies are not reported, the official labeling contains no formal requirements for timing separation, no medicinal products classified as contraindicated combinations, and no restrictions on co-administration with other agents. This regulatory structure is consistently stated across the current United States labels.

Mechanism of Action

Polidocanol's primary mechanism relies on its action as a non-ionic surfactant, chemically disrupting the lipid membrane of venous endothelial cells. This interaction results in immediate cellular destruction or lysis, which exposes the underlying tissue. This exposure rapidly activates the local coagulation cascade, triggering platelet aggregation and fibrin formation. The resulting dense thrombus organizes into permanent fibrous tissue (sclerosis), physically occluding the vessel lumen. Concurrently, the molecule engages the peripheral nervous system by stabilizing the membranes of sensory nerve fibers, thereby blocking the transmission of action potentials. This dual action provides a simultaneous blockade of local sensation. The sclerosing mechanism is highly sensitive to the concentration-dependence and dilution constraints imposed by blood flow, meaning sufficient contact time with the endothelium is a necessary factor for the mechanism to successfully induce lysis.

Dosage and Administration Information

How to use Polidocanol

Polidocanol is administered exclusively by a trained healthcare provider in a clinical setting, structuring its use as a specialized procedural treatment. The approved route for addressing peripheral vascular conditions is by intravenous injection.

The medication is available as an injectable solution (e.g., 0.5% and 1% strengths) and an injectable foam (activated from a 1% solution). Administration requires precision; for the solution, 0.1 to 0.3 mL is injected per site. The total volume used in any single session is limited, typically not exceeding 10 mL of solution or 15 mL of foam, to guide the scale of treatment.

Treatment is conducted as a course of multiple sessions over time. Sessions for the injectable solution are generally separated by 1 to 2 weeks, while treatments using the foam form require a minimum interval of 5 days. Furthermore, the foam must be used within 75 seconds of its preparation.

The proper use of Polidocanol includes mandatory, concurrent physical steps. Immediately following administration, patients are directed to perform 10 to 20 minutes of walking. This is followed by the required application of a compression bandage or stocking to the treated limb for a specific duration, ranging from 2 days to 2 weeks depending on the form and size of the treated vessel. Safety and effectiveness have not been established in pediatric patients.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Polidocanol

Evidence for Use in Spider Veins and Reticular Veins

Research exploring Polidocanol's use for small, uncomplicated surface veins was studied for the evaluation of anatomical changes. The primary evidence base comes from Randomized Controlled Trials (RCTs) and systematic reviews that synthesize these findings. These studies were applied in research contexts involving adults with visible spider veins (those under 1 mm) and reticular veins (1–3 mm in diameter) on the lower extremities.

In these trials, research examined a few key areas: how the appearance of the treated area changed according to investigator grading scales, and the vein obliteration/closure rate confirmed visually or by ultrasound. The research also explored patient-reported outcomes describing perceived discomfort and patient experience. Studies report how symptoms evolved in the observed populations over relatively short periods.

Evidence for Use in Superficial Venous Incompetence (Varicose Veins)

Research exploring Polidocanol microfoam was studied for conditions involving changes in larger veins. The evidence in this area relies heavily on large Randomized Controlled Trials (RCTs) and network meta-analyses that were evaluated in adults with chronic venous disease, covering a range of severity from visible varicose veins to advanced venous disease.

These studies often were evaluated in comparative settings, where Polidocanol foam was observed in trials against other procedures like thermal ablation or conventional surgery. Research examined outcomes related to systemic or functional imbalance, such as changes in the Venous Clinical Severity Score (VCSS) and ultrasound-confirmed vein obliteration rates. Findings describe patterns observed in the studies regarding vein closure and the evolution of quality of life scores specific to venous conditions.

What is Still Uncertain About Polidocanol Evidence

Reviewers and regulatory bodies have identified several gaps in the research base. Evidence quality varies across studies, leading to some uncertainty when trying to combine results across trials for meta-analysis. A major limitation is that the follow-up durations were limited in many key studies, meaning long-term effects remain uncertain regarding recurrence rates for both spider veins and internal hemorrhoids. Comparative evidence is lacking in some areas when Polidocanol was evaluated in comparison to every alternative treatment option. Data for certain groups remain insufficient, especially for rare indications like venous malformations where sample sizes were modest and the studies lack randomization.

Key Studies & References Effectiveness of Polidocanol in the Treatment of Venous Malformations: A Meta-Analysis

Frequently Asked Questions (FAQ)

Common questions about Polidocanol (FAQ)

Q: What kind of veins is Polidocanol typically used for?

Polidocanol is indicated for specific types of veins in the lower extremities. The injectable solution is used for uncomplicated spider veins (those less than 1 mm) and reticular veins (between 1 mm and 3 mm in diameter). Separately, the injectable foam is approved for addressing the larger incompetent saphenous veins and related visible varicose veins, according to regulatory documents.


Q: What is the difference between Polidocanol and laser treatment for veins?

Polidocanol and laser treatment are distinct types of specialized procedures. Polidocanol acts as a chemical sclerosing agent which is injected to cause the physical closure of the vein lining. In contrast, laser treatment (thermal ablation) is a physical procedure that uses heat to achieve the same goal of closing the affected vessel. Both are procedural treatments for varicose veins.


Q: Are there any long-term research findings about Polidocanol?

Clinical studies have established the efficacy of Polidocanol for its approved uses. However, official information notes that many key studies had limited follow-up durations. Because of this, long-term effectiveness and recurrence rates for veins over many years remain uncertain based on the regulatory evidence.


Q: Is Polidocanol considered a high-risk medication?

Official regulatory documents categorize the effects of Polidocanol by frequency. The most common effects are localized reactions such as pain or bruising at the injection site. However, rare but serious risks are documented, including deep vein thrombosis (DVT), pulmonary embolism, and severe allergic reactions. The procedure is designed to be administered in a medical setting where the administering provider is prepared to manage these rare events.


Q: Can Polidocanol interact with common over-the-counter pain relievers?

Regulatory documents explicitly state that drug interaction studies have not been conducted for Polidocanol injectable formulations. Therefore, no formal interactions with common over-the-counter pain relievers or any other specific drugs are listed in the official labels.


Q: Is Polidocanol appropriate for older adults?

According to official product information, Polidocanol is approved for use in adult patients, defined as those aged 18 years and older. Clinical trials included older patients, and no overall differences in safety or effectiveness were observed between older and younger adult patients.


Q: What happens if Polidocanol leaks out of the treated area?

If the injection accidentally leaks outside the vein (extravasation) or is injected into an artery, the regulatory documents warn this can cause severe tissue damage (necrosis) or ulceration. This outcome is a documented risk, which underscores why the procedure is performed by a specialized healthcare professional.


Q: Is the treatment with Polidocanol permanent?

The mechanism of action is designed to induce permanent sclerosis (fibrous closure) of the treated vessel. While the goal is permanent closure, official research notes that long-term follow-up data is limited, and the potential for vein recurrence over time exists.


Q: What other medications should I disclose before receiving Polidocanol?

Although formal interaction studies are limited, patients are generally directed to disclose all medicines they are taking to the healthcare provider. This includes prescription and over-the-counter drugs, as well as any vitamins or herbal supplements, which is a standard requirement for specialized medical procedures.


Q: Are there different concentrations of Polidocanol used for different vein sizes?

Yes, regulatory documents indicate that different strengths are used for different target veins. For example, the 0.5% solution is generally used for the smallest spider veins, and the 1% solution is used for slightly larger reticular veins. Higher concentrations in the foam form are used for larger saphenous system veins.


Q: What is the role of compression stockings after Polidocanol treatment?

The application of compression to the treated limb is a mandatory post-treatment step defined in the regulatory documents. Compression is required to help reduce the risk of developing a deep vein thrombosis (DVT), which is a major safety consideration, and also helps promote effective vein closure.


Q: Is Polidocanol effective for all types of varicose veins?

Polidocanol is not indicated for all types of varicose veins. The injectable solution is specifically indicated for uncomplicated spider and reticular veins. The injectable foam is indicated for the treatment of incompetent great saphenous veins and related varicosities, which covers a specific range of chronic venous disease.


Q: Can I exercise after receiving Polidocanol?

The regulatory documents require patients to walk for 10 to 20 minutes immediately following the procedure. Beyond this mandatory walking, patients are advised in the product documentation to seek clinical guidance regarding the resumption of strenuous activity or heavy exercise.


Q: Is it necessary to stop taking any supplements before Polidocanol treatment?

Official regulatory documents do not list any required or mandatory cessation of supplements, foods, or herbal products before Polidocanol treatment. However, all products being taken should still be fully disclosed to the physician administering the procedure.


Q: Is Polidocanol the same as other medicines used for veins?

Polidocanol is one of several types of sclerosing agents used to treat venous conditions. It is chemically distinct from other sclerosing agents. Polidocanol is recognized for having a dual pharmacological property, functioning as both a sclerosing agent and a local anesthetic.


Q: How quickly does Polidocanol start to work after administration?

The cellular action of Polidocanol is immediate, as its mechanism of action causes the immediate disruption and destruction of the vein wall (lysis). However, the therapeutic outcome, which is the complete physical closure of the vein (sclerosis), occurs as part of a natural healing process over time.


Q: Is it normal to feel a mild burning sensation after the procedure?

Injection site pain is listed as a very common side effect in regulatory documents. Clinical trial participants commonly reported this localized pain as a stinging, aching, or burning sensation that typically resolves quickly following the procedure.


Q: Can Polidocanol be used on any area of the body?

Polidocanol is indicated only for the treatment of uncomplicated varicose veins and spider veins in the lower extremity (the leg). Use on other areas of the body is not within the scope of the current official indications.


Q: Is there a maximum number of Polidocanol treatments a person can have?

Regulatory documents do not establish an official lifetime maximum number of sessions for Polidocanol. The treatment is conducted as a course of multiple sessions over time, with strict limits placed on the total volume used during any single session.


Q: Can people with high blood pressure use Polidocanol?

High blood pressure (hypertension) is not listed as a formal contraindication in regulatory documents. However, caution is required for any patient with underlying arterial disease or cardiovascular conditions, and all patients must be assessed by a physician prior to treatment.


Q: Does smoking affect the results of Polidocanol?

Smoking is not a formal contraindication listed in regulatory documents. However, smoking is a recognized risk factor for vascular disease and deep vein thrombosis (DVT), which is a rare but serious adverse event associated with the procedure.


Q: Why is leg movement recommended after receiving Polidocanol?

Immediate post-treatment walking for 10 to 20 minutes is a mandatory step outlined in regulatory documents. This activity is required to help reduce the risk of developing a deep vein thrombosis (DVT), which is a serious complication associated with the sclerosing process.


Q: How is Polidocanol different from saline solutions used for the same purpose?

Polidocanol is a detergent-based sclerosing agent with anesthetic properties, which is designed to chemically close the vein. Saline solutions (salt-based) are an older type of sclerosing agent. Polidocanol possesses a local anesthetic property, whereas saline solutions may be associated with more injection-site pain and cramping.


Q: Can Polidocanol be used by people with diabetes?

Diabetes is not listed as a formal contraindication in regulatory documents. However, caution is required, as patients with diabetes may have coexisting underlying arterial disease, which is a conditional restriction for the use of Polidocanol.


Q: Does Polidocanol affect fertility?

Official studies to evaluate the effects of Polidocanol on fertility in humans have not been performed. However, animal studies conducted as part of the regulatory submission process showed no evidence of reproductive toxicity.


Q: Is there a generic version of Polidocanol available?

Yes, Polidocanol is the generic name for the active ingredient (Lauromacrogol 400). It is available under several different brand names in various concentrations and forms (solution and foam), as listed in regulatory and approved drug databases.


Q: Does sun exposure have an impact on the treated area?

While not a formal warning, official product information indicates that sun exposure to the treated area is generally advised against. Exposing the area to the sun may increase the risk or duration of hyperpigmentation (darkening of the skin), which is a common side effect of the procedure.


Q: Can Polidocanol affect birth control pills?

Official drug interaction studies were not conducted. However, regulatory documents include a warning noting that the risk of thrombosis (blood clots) is already increased in patients taking hormonal contraceptives, which is a conditional factor requiring physician assessment.


Q: How long do the minor side effects typically last?

Minor side effects like bruising and pain are typically temporary, resolving within days to a few weeks. However, hyperpigmentation (skin darkening) is a common side effect that may take several months to resolve, and in rare cases, may be permanent.


Q: Is Polidocanol safe for people with known heart problems?

Polidocanol is formally contraindicated in patients with acute thromboembolic disease, such as DVT or PE. Caution is also formally advised for patients with underlying cardiovascular conditions or factors that increase the risk of thrombosis.


Q: Do studies support the use of Polidocanol in different ethnic groups?

The demographic sections of clinical trials reviewed by the FDA provide a breakdown of study participants, which includes subjects from various ethnic groups. Official regulatory reviews have not formally identified any overall difference in safety or efficacy between ethnic groups.


Q: How is the need for a follow-up treatment decided?

The need for retreatment is a clinical decision based on the patient's individual condition and response to the initial procedure. Regulatory documents state that retreatment may be necessary if the extent of the vascular condition requires more than the maximum volume allowed in a single session.


Q: What is the history of Polidocanol use in medicine?

Polidocanol was first developed in the 1950s with an initial focus on its local anesthetic properties. Its ability to act as a sclerosing agent was quickly recognized, and it has been in use in Europe and other regions for many years prior to its later approvals in the United States.

How should Polidocanol be stored and disposed of?

How to Store and Dispose of Polidocanol

The storage and disposal of Polidocanol injection are strictly defined by regulatory documents to ensure product stability and safety.

Official Storage Requirements

Polidocanol must be maintained at a Controlled Room Temperature, defined as 15 C to 30 C (59 F to 86 F). It is mandatory to protect the injection from freezing and store it in the original container.

As a single-use, preservative-free solution, it must be used immediately after opening, and any unused portion must be discarded.

Disposal and Safety

The product must be stored out of the sight and reach of children. Disposal of the unused product and waste material must be carried out in accordance with local regulations, and the medicine should not be disposed of in household waste or wastewater.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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