Verrumal

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Verrumal

Treatment option: Keratoses, Actinic Keratosis

Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Verrumal

Quick Facts

Property Description
Active Ingredients Fluorouracil, Sodium Salicylate
Form Cutaneous solution (Topical liquid)
Pharmacological Class Antimetabolite, Keratolytic Agent
Origin Synthetic combination preparation

Verrumal: Identity and Specialized Combination

Verrumal is a highly specialized, prescription-only synthetic combination preparation formulated as a cutaneous solution, meaning it is a liquid medicine intended solely for topical and external administration to the skin. Unlike many monotherapies, Verrumal's identity is defined by the inclusion of two distinct, powerful active ingredients working in synergy. This preparation is manufactured and distributed internationally, primarily in European markets, and is clinically recognized for its concentrated liquid form designed for precise application to small, localized areas.


Composition and Dual Pharmacological Classification

The medicine contains two principal active ingredients: Fluorouracil (5-FU) and Sodium Salicylate. Fluorouracil is classified as an Antimetabolite drug, which works by interfering with cell growth. Sodium Salicylate is utilized as a powerful Keratolytic Agent. This dual composition ensures Verrumal is categorized within two primary pharmacological classes. The preparation is suspended in a specialized hydro-alcoholic solution base, which aids in the penetration and stability of the synthetic compounds.


The General Principle of Verrumal’s Action

The preparation is designed to facilitate the controlled reduction and removal of abnormal, thickened skin formations, a typical use scenario being the localized treatment of common or plantar skin lesions. This overall general purpose is achieved through the complementary effects of its ingredients: Fluorouracil provides targeted cell growth inhibition, and Sodium Salicylate acts to soften and dissolve the protein structure of the hardened, thickened skin tissue. The combination of Fluorouracil with keratolytic agents is a recognized approach for localized treatment in dermatological practice.

Regulatory References

  1. NIH MedlinePlus Information

What side effects are possible with Verrumal?

Possible Side Effects and Safety Information

The safety profile for Verrumal, a topical solution, is largely characterized by local effects at the application site. Regulatory documents organize these possible reactions by their frequency and the system-organ class affected, based on clinical data.

Frequency-Classified Adverse Reactions

The most commonly expected side effects are localized to the area where the solution is applied, resulting from the intended keratolytic and cytotoxic actions of the components.

Frequency Category Typical Reactions (Application Site)
Very Common (ge 1/10) Erythema (redness), irritation, inflammation, pain, burning sensation, and itching.
Common (ge 1/100 to < 1/10) Desquamation (peeling), crusting, and dryness.
Uncommon or Rare Systemic allergic reactions or hypersensitivity, localized erosion, or ulceration.

Serious Adverse Reactions and Safety Constraints

Although Verrumal is applied topically, the regulatory label includes precautions and constraints to minimize the risk of rare, serious effects and improper use.

  • Serious Reactions: Rare but documented serious reactions include severe local tissue damage (e.g., deep ulceration) and potential systemic toxicity, particularly if large areas of skin are treated or if used improperly.
  • Systemic Risk: The risk of systemic absorption of the active components (fluorouracil and salicylic acid) increases with the size of the area being treated and the duration of application.
  • Population Restrictions: Safety statements exist concerning specific groups. The product is typically restricted or contraindicated for use during pregnancy and lactation. Its use in pediatrics may be limited by age and maximum treated surface area.
  • Absolute Restrictions: The solution must be kept strictly away from mucous membranes, eyes, and areas of intact, healthy skin. Patients with a known deficiency of the DPD enzyme should generally not use products containing fluorouracil.

These safety classifications and restrictions define the official risk profile, indicating that local irritation is expected, but systemic risk must be actively managed by adhering to regulatory limitations on treatment area.

Overdose and Emergency Response

Overdose with the Fluorouracil/Sodium Salicylate cutaneous solution is characterized by two distinct risk profiles: severe localized tissue damage and the potential for systemic toxicity from Fluorouracil absorption.

Local overdose due to excessive or prolonged application may progress to severe tissue destruction, including erosion, ulceration, and necrosis at the application site. Regulatory guidance requires immediate discontinuation of the product when such severe local reactions occur.

Systemic overdose, which typically results from accidental ingestion or high absorption, primarily affects the haematopoietic system and the gastrointestinal tract. Documented manifestations include severe abdominal pain, bloody diarrhea, vomiting, fever, chills, and stomatitis. The systemic risk is considered life-threatening, and the official profile notes that haematological monitoring for several weeks is required in confirmed cases.

Immediate medical attention must be sought following accidental ingestion of the solution. A physician must also be contacted if any systemic symptoms of toxicity, such as persistent diarrhea or fever, are observed. The official guidance states that no specific antidote is known; therefore, management relies solely on providing symptomatic and supportive treatment. Population-specific overdose notes highlight the increased risk of systemic toxicity among children/infants and in individuals with a DPD enzyme deficiency, a critical factor for severe outcomes.

Therapeutic Uses of Verrumal

Verrumal is applied in clinical settings that involve acute or unstable symptom patterns, relevant in conditions characterized by periods of heightened symptoms, specifically targeting symptoms related to inflammatory or irritative states and visible skin proliferations. As a dermatological preparation, its primary therapeutic domain is specialized skin care.

Verrumal is commonly used across conditions presenting with acute episodes, and may be part of symptomatic management for symptoms that interfere with daily comfort, such as those related to common warts, plantar warts, and plane juvenile warts. This preparation is applied across domains where additional symptomatic support is needed.

“It may assist with easing the overall symptom burden caused by growths that create noticeable physiological strain.”

This approach may provide supportive relief when symptoms interfere with routine activities, which may assist with easing the discomfort associated with these skin lesions. The solution is considered relevant in contexts involving heightened systemic burden.

Quick Fact: Relief for Symptoms that Interfere with Daily Functioning

Regulatory References

  1. Israeli Ministry of Health Summary of Product Characteristics (SmPC)

Eligibility and Restrictions for Use

Who Can and Cannot Use Verrumal?

The official regulatory profile for Verrumal strictly defines eligibility through mandatory contraindications and patient-specific limitations. These restrictions determine who is permitted to use the medicine.


Absolute Contraindications

The medicine must not be used in several defined populations. This includes women who are pregnant or breastfeeding. It is also contraindicated in patients with a known complete deficiency of the Dihydropyrimidine Dehydrogenase (DPD) enzyme, which is responsible for breaking down one of the active ingredients. Use is prohibited if the patient is taking or has taken specific antiviral medicines (such as Brivudine or Sorivudine) within the previous four weeks.


Age and Condition Restrictions

Verrumal must not be used on infants (babies). Use in small children is highly restricted; the official label requires strict adherence to limitations on the application area to prevent systemic absorption. Patients with pre-existing conditions that cause sensory disturbances (such as those associated with diabetes) require regular medical examinations while using the solution. Caution is also necessary for patients taking the anti-seizure medication phenytoin. The product is intended for adults and older children who meet all other eligibility criteria.

What should I know about interactions with other medicines?

Interactions with Other Medicines and Products

This section describes the formally documented interaction patterns for Verrumal's active ingredients, as specified in authoritative government regulatory sources.

Interaction Category Specific Interacting Substance(s) Official Constraint / Mechanism Class
Absolute Contraindication Brivudine, Sorivudine, and analogues Prohibited from co-administration due to fatal toxicity risk (DPD enzyme-mediated).
Mandatory Timing Rule Brivudine, Sorivudine Requires a minimum four-week separation period between use to mitigate severe pharmacokinetic risk.
Pharmacodynamic Risk Anticoagulants (e.g., Warfarin) Increased risk of hemorrhage and altered coagulation parameters due to Salicylate component.
Exposure Modification Phenytoin (Anticonvulsant) Potential for elevated total and/or free plasma concentrations via protein-binding displacement.

Regulatory Interaction Profile

The most critical interaction establishes an absolute prohibition on co-administering Verrumal with antiviral agents such as Brivudine or Sorivudine. This is due to a severe pharmacokinetic risk where inhibition of the Dihydropyrimidine Dehydrogenase (DPD) enzyme prevents the breakdown of the Fluorouracil component, leading to significantly increased exposure and toxicity. Official documents mandate a minimum four-week separation period between these treatments. The Salicylate component introduces additional risks, including a documented pharmacodynamic interaction with Anticoagulants, which increases the potential for bleeding. Furthermore, salicylates may displace the protein-bound anticonvulsant Phenytoin, which can potentially increase its plasma concentration. The product’s use is also contraindicated in patients with renal insufficiency, as reduced clearance potentiates the risk of accumulation and enhanced systemic toxicity.

Mechanism of Action

Mechanistic Domains: Interruption of Cell Growth and Tissue Dissolution

Verrumal's mechanism relies on the coordinated action of two ingredients, each targeting distinct biological systems. Fluorouracil (5-FU) acts as an antimetabolite, targeting rapidly dividing cells by inhibiting the essential enzyme Thymidylate Synthase (TS). This blocks the pyrimidine synthesis pathway, leading to DNA synthesis failure and resulting in cytotoxicity. Simultaneously, Salicylic Acid acts as a keratolytic agent, dissolving the protein structures (Intercellular Cement Substance) that maintain cohesion between cells in the Stratum Corneum.


Coordinated Synergy and Enhanced Delivery

The combination establishes a coordinated synergistic mechanism. The physicochemical dissolution of the outer barrier by Salicylic Acid removes structural integrity, which allows for significantly increasing the local intracellular delivery of the antimetabolite (5-FU) to the underlying hyperproliferative target cells. This dual mechanism results in the physiological consequence of enhanced desquamation (shedding) and the suppression of underlying cell proliferation.

Dosage and Administration Information

How to Use Verrumal — Administration Guidelines

Verrumal is a cutaneous solution intended for topical application directly to the affected skin area.

Administration Scope and Regimen

The recommended dosing schedule is to apply the solution to each lesion two to three times daily. Treatment must be applied consistently every day. The average course duration is six weeks, though treatment may continue for approximately one week after the lesion has fully cleared.

Administration Detail General Guideline
Route Cutaneous (Topical application to the skin)
Frequency Two to three times daily
Use in Children Must not be used on infants; use in children generally requires medical advice.
Area Restriction Must not be applied to a skin area larger than 25 cm².

Procedural Steps

  1. Protect Healthy Skin: The solution must only come into contact with the lesion itself. If necessary, the healthy skin surrounding the lesion should be covered with a protective cream or paste before application.
  2. Targeted Application: Apply the solution to the lesion using the applicator brush. For very small lesions, a tool like a toothpick may be used for more precise application.
  3. Drying and Film Formation: Allow the solution to dry fully after application, which forms a thin film over the treated area. The solution is flammable until this film is formed.
  4. Film Removal: The residual film coating must be removed before each new application. This can typically be done by simply peeling it off, or by washing the area with hot water and gently rubbing the top layer of the lesion.

If an application is missed, users should not apply a double dose to compensate. The treatment should be continued as scheduled at the next planned time.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Verrumal


Evidence for Common and Plantar Warts (Verrucae)

Research exploring the combination solution for warts has included Randomized Controlled Trials (RCTs), which are a required type of evidence for regulatory review, as well as systematic reviews and meta-analyses that combine data from multiple RCTs. These studies were used to evaluate the differences in measured outcomes between the combination preparation group and its individual active ingredients group, such as 5-Fluorouracil (5-FU) only or Salicylic Acid (SA) only, and against a placebo (a treatment containing no active ingredients). The primary measurements tracked in this research were related to the total resolution of lesions and the reduction in the overall number or size of the warts.

Findings described in aggregated data from meta-analyses reported distinct patterns in the rate of resolution measurements. Specifically, in these studies, measurements of complete resolution rates were documented to be different between the combination solution group and the groups where 5-FU or SA was used alone. These findings describe group patterns and contribute to the understanding of symptom patterns over the observed time intervals.


Evidence for Actinic Keratosis Lesions

The evidence structure for Actinic Keratosis (AK) lesions is based on Phase III Randomized Controlled Trials (RCTs). Researchers focused on specific measurements, including histological clearance (the microscopic elimination of atypical cells within the lesion) and complete clinical resolution (the visible resolution of the lesion). Results from a key Phase III trial reported a difference in the measurement rate for both histological clearance and complete clinical resolution between the group receiving the combination treatment and the vehicle-only control group. This research explores short-term changes and provides context regarding how lesions evolved in the observed populations.


Long-Term Outcomes and Persistence of Resolution

Studies for both conditions typically focus on studying the primary outcome measurement (resolution) within a short to intermediate time frame. While the findings describe these short-term measurements, long-term outcomes regarding the persistence of resolution and the specific reappearance of lesions are not consistently or fully established across all published trials. Research in this area is ongoing, but limited information is available for extended follow-up outcomes, which may influence the overall knowledge of the research observations over time.


What Remains Uncertain in the Research Landscape

Several limitations and gaps exist in the current evidence that researchers continue to explore:

  • Follow-up durations were limited in many primary trials, meaning there is limited information for long-term outcomes.
  • Comparative evidence is lacking for certain alternative therapeutic approaches, such as comparisons against aggressive forms of cryotherapy (freezing).
  • Subgroup findings are uncertain in some areas, particularly concerning data available for the female population in Actinic Keratosis trials. The research provides context but not individual predictions.

Key Studies & References

  1. Verrumal Summary of Product Characteristics (SmPC) (Regulatory Document)

Frequently Asked Questions (FAQ)

Common questions about Verrumal (FAQ)

Q: What is the difference between Verrumal and over-the-counter wart treatments?

A: Verrumal is a prescription-only medicine defined by its specialized composition. Official product information describes it as a combination of a keratolytic agent (salicylic acid, which dissolves hardened skin) and a cytostatic agent (fluorouracil, which inhibits cell growth). This dual action is intended to enhance the penetration and effect of the treatment compared to single-ingredient preparations.

Q: What kind of warts is Verrumal specifically approved to treat?

A: According to official regulatory documents, Verrumal is indicated for the treatment of various types of lesions. These include common warts (verruca vulgaris), juvenile flat warts, plantar warts (verrucae on the sole of the foot), and seborrheic warts.

Q: Is it normal for the treated area to change color?

A: It is normal for the treated area to show visible changes due to the way the medicine works. The keratolytic component causes the outer layer of hardened skin to dissolve and exfoliate (peel). This process may result in the tissue appearing white or changing color before it is ready for removal.

Q: Is there a list of ingredients in Verrumal that could cause an allergic reaction?

A: The active ingredients are fluorouracil and salicylic acid. The solution also contains inactive ingredients, or excipients, such as dimethyl sulfoxide and ethanol (alcohol). Official product information notes that these excipients may cause skin irritation or, rarely, contribute to contact-allergic reactions in susceptible people.

Q: Can Verrumal be used on warts located on the face or sensitive body areas?

A: Regulatory information indicates that the product is contra-indicated for use on mucous membranes (e.g., inside the nose or mouth). If warts are located on thin skin areas like the face, official documents restrict use to less frequent application and require more frequent checks due to the potential for scars to form.

Q: Why is it important to avoid getting Verrumal near the eyes or mucus membranes?

A: Official product information includes a mandatory warning to avoid contact with the eyes or mucous membranes. Use on these areas is contra-indicated because official documents describe a risk of severe local effects on these sensitive tissues, and this helps manage the risk of the active ingredients being absorbed into the body.

Q: Do studies show Verrumal is more effective on certain types of warts than others?

A: Clinical trials reviewed by regulatory bodies assessed the treatment of both common and plantar warts. The findings described group patterns and documented differences in the measured outcomes when compared to treatments using only single active ingredients or placebo. However, no official claim of the product being superior for one type of wart over another is made.

Q: What is the legal classification of Verrumal regarding its safety profile?

A: Verrumal is classified as a prescription-only medicine in the regions where it is approved. This classification reflects that it contains 5-fluorouracil, a potent medicine that inhibits cell division, which requires supervision and adherence to specific regulatory constraints.

Q: Do I need to change my activities while using Verrumal?

A: General daily activities are not restricted by official guidance, but safety warnings must be observed. The solution is officially listed as flammable until the thin film coating has completely dried on the skin. The safety warning mandates the avoidance of open flames or heat sources (e.g., lighting a cigarette or being near a fire) during and immediately after application.

Q: Is Verrumal suitable for people with sensitive skin?

A: Official safety documents report that local skin reactions are very common at the application site, even in patients without pre-existing sensitivity. These effects include erythema (redness), inflammation, irritation, and a burning sensation. For individuals who are already susceptible, regulatory documents note that slight irritation or contact-allergic reactions may occur.

Q: Does alcohol consumption affect the use of Verrumal?

A: Official product documents do not list any interactions with consumed alcohol. However, the product itself contains ethanol (alcohol) as an inactive component. This excipient may be the cause of a localized burning sensation if the application site skin is damaged.

Q: Are there restrictions on sun exposure while using Verrumal?

A: Yes, official safety advice states that patients should avoid prolonged exposure to ultraviolet radiation during the treatment period. This includes avoiding extended periods of natural sunlight while the product is in use.

Q: What is the role of the film-forming ingredient in Verrumal?

A: The solution is formulated in a special hydro-alcoholic base that allows it to dry and form a thin, protective film directly over the lesion. This process is intended to keep the active ingredients concentrated at the application site. Official instructions indicate the film should be physically removed before the next scheduled application.

Q: Is Verrumal treatment considered cosmetic or purely medical?

A: Verrumal is classified as a medicinal product by regulatory authorities. It is approved and intended exclusively for therapeutic indications, meaning its use is for the medical treatment of specific skin lesions, such as warts.

Q: What is the difference between an adverse reaction and a common side effect of Verrumal?

A: Regulatory documents use categories to classify how often or how severely effects are reported, rather than providing a formal definition of the difference between the terms. Effects are organized by frequency (e.g., Very Common vs. Uncommon) and severity (e.g., local irritation vs. serious reactions like ulceration).

Q: Can Verrumal be used alongside other topical treatments?

A: The regulatory information focuses on interactions with systemic medicines, warning that salicylic acid absorbed through the skin may interact with certain oral medications (such as methotrexate). Official warnings state that caution is necessary when applying the product to damaged skin, but no explicit prohibition on other topical treatments is listed.

Q: Why is Verrumal often combined with mechanical removal techniques?

A: Official administration guidelines state that the residual film that forms on the lesion must be removed before each new application. This removal is performed as part of the official application procedure by peeling off the film or by washing the area with hot water and gently rubbing the top layer of the treated lesion.

Q: What are the common reasons Verrumal treatment might be stopped early?

A: The intended reason for completing the course is the complete and visible clearance of the lesion. Treatment may also be stopped earlier if the patient experiences severe local adverse events, such as excessive inflammation or ulceration, or if they demonstrate a lack of tolerance to the product.

Q: Why is Verrumal usually applied as a thin coating?

A: Official guidance emphasizes that the application must be limited to the exact area of the lesion and must not exceed a maximum surface area (25 cm²). Applying a thin, targeted coating is necessary to follow this guidance and minimize the risk of systemic absorption of the active ingredients and to reduce the frequency and severity of local reactions.

Q: What happens if Verrumal is accidentally swallowed?

A: Accidental ingestion of Verrumal is associated with an official warning stating that immediate medical attention should be sought. Official product information advises taking the medicine bottle and its contents along to the emergency medical provider.

How should Verrumal be stored and disposed of?

How to Store and Dispose of Verrumal

Official regulatory information outlines specific requirements for storing and handling Verrumal Solution:

Storage and Handling Requirements

Requirement Type Official Regulatory Statement
Temperature Do not store above 25 °C.
Flammability Flammable fluid: Keep away from open fire and flames.
Container Integrity Close the bottle tightly immediately after use.
Stability Do not use for more than 6 months after the bottle is opened.
Child Safety Keep out of the reach of children.

Disposal Instructions

Official documentation states there are no special requirements for the disposal of unused or expired Verrumal Solution. However, patients are typically advised to consult local pharmaceutical take-back programs.

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

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