Ascalol

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Ascalol

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 Ascalol

Ascalol is defined as a medicinal product whose active ingredient is the synthetic compound Benzyl benzoate. This substance is formally classified as an ectoparasiticide, with the general purpose of chemically clearing external parasite infestations by rapidly neutralizing the organisms residing on the skin.


Quick Facts: Ascalol (Benzyl Benzoate)

Property Description
Active ingredient Benzyl benzoate
Form Topical emulsion, lotion, or solution
Pharmacological class Ectoparasiticide, Antiparasitic agent
Common purpose Elimination of external parasites
Origin Synthetic compound (Organic ester)

What Type of Medicine is Ascalol?

Ascalol is rigorously categorized as an Ectoparasiticide, a specific type of medication that acts on parasites that live on the outer surface of the host. Its active component, Benzyl benzoate, is a widely recognized organic ester and is featured on the World Health Organization (WHO) Model List of Essential Medicines. This WHO recognition highlights the compound's established global utility as a key agent against parasitic conditions.

Composition and Formulation: Understanding the Topical Emulsion

Ascalol is characterized as a single active ingredient product, relying entirely on the established pharmacological properties of Benzyl benzoate rather than a combination of agents. It is formulated primarily for topical administration as an emulsion, lotion, or solution. The compound Benzyl benzoate is a benzoic acid benzyl ester confirming its synthetic origin. This specialized liquid preparation uses a base containing water and suitable emulsifying agents to suspend the active ingredient uniformly. The choice of a light topical emulsion promotes ease of application over large, affected surface areas.

What Is the General Purpose of Ascalol's Action?

The general therapeutic purpose of Ascalol is neurotoxic eradication. The Benzyl benzoate component targets and chemically disrupts the nervous system of the target parasites. The substance rapidly induces paralysis in the ectoparasites, quickly stopping their movement, feeding, and reproductive capability. This decisive action provides the necessary means for the host's body to resolve the infestation, which is the foundational step in alleviating the associated discomfort and irritation.

Regulatory References

  1. WHO Essential Medicines List
  2. NIH StatPearls: Ectoparasiticides
  3. WHO EML for Benzyl benzoate

What side effects are possible with Ascalol?

Possible side effects and safety information

The official safety profile for Ascalol, which contains the active ingredient Benzyl benzoate, is defined primarily by localized dermal reactions and restrictions on use, as documented in regulatory sources.


Adverse Reaction Scope

The most commonly noted adverse reactions are confined to the application site and are classified as Skin and subcutaneous tissue disorders. These expected effects include a transient burning sensation, stinging, local erythema (redness), and skin irritation. Hypersensitivity reactions, such as allergic dermatitis, have also been reported in regulatory documents.

Serious adverse reactions are documented, but are chiefly associated with systemic exposure due to accidental ingestion or excessive application. These effects fall under Nervous system disorders and include Central Nervous System (CNS) stimulation and convulsions.


Population and Administration Constraints

Official regulatory documents include specific safety considerations for certain populations. The use of Ascalol is generally not recommended in infants and children under 2 years of age by some authorities. For individuals who are pregnant or breastfeeding, use is typically advised only if considered essential, with some guidance suggesting the suspension of breastfeeding during treatment.

Use is contraindicated in individuals with a known hypersensitivity to the active ingredient. The product must be strictly prevented from contacting mucous membranes or the eyes. Furthermore, the topical application is restricted and should not be used on broken, inflamed, or open skin.

Overdose and Emergency Response

Ascalol (Benzyl Benzoate) overdose is documented to present primarily with signs of systemic neurotoxicity, which can follow either accidental ingestion or excessive topical application. Regulatory information indicates that central nervous system effects include CNS stimulation and may progress to severe manifestations such as convulsions, ataxia, and tremors. Other systemic presentations listed in labeling include gastrointestinal effects like vomiting, nausea, and diarrhea, as well as difficulty in urinating (dribbling).

The official regulatory profile establishes certain outcomes as severe or life-threatening, specifically identifying respiratory paralysis or failure and dyspnea (difficulty breathing) as potential complications, alongside the risk of sudden loss of consciousness. Urgent medical attention is required when these severe symptoms occur. Regulatory guidance mandates that a Poison Center or physician must be contacted immediately if overdose is suspected or confirmed.

Management of overdose is strictly based on symptomatic and supportive treatment because official labeling states that no specific antidote is known. In cases of oral poisoning, procedural steps such as gastric lavage and aspiration are described as appropriate supportive measures. A heightened risk of severe central nervous system symptoms is noted following accidental oral ingestion, particularly in the pediatric population.

Therapeutic Uses of Ascalol

What Ascalol Treats: Main Uses and Benefits


Ascalol is commonly used to manage ectoparasitic infestations, specifically scabies (a condition caused by mites) and pediculosis (infestation with lice). These are conditions involving inflammatory or irritative processes. Its use helps manage the parasitic load, which provides support that helps ease the overall symptom burden and may assist with the process of resolving the highly contagious skin condition.

Its use is considered relevant in clinical settings that involve acute or unstable symptom patterns to address symptom clusters that may become intense or disruptive, such as severe pruritus (itching) that often interferes with daily functioning, alongside associated skin rashes and redness. This supports the patient during difficult episodes by easing distress and contributes to improved day-to-day comfort. Ascalol is also relevant in conditions where transmission is high, such as household or institutional settings, and may be relevant for supporting individuals who have had contact with the infestation.


Quick Fact: Symptomatic Relief

The common indications for Ascalol include the symptomatic management of skin discomfort associated with scabies, head lice, body lice, and pubic lice.

Regulatory References

  1. NIH MedlinePlus on Scabies

Eligibility and Restrictions for Use

Who can and cannot use Ascalol?

Eligibility for Ascalol (Benzyl benzoate) is defined by official population-based rules and restrictions, primarily addressing hypersensitivity, age, and the integrity of the skin.

Eligibility Classification Official Regulatory Status
Absolute Contraindications Prohibited for use in patients with known hypersensitivity to Benzyl benzoate or any component of the formulation.
Skin Condition Restrictions Must not be applied to broken, acutely inflamed, or secondarily infected skin or to open wounds due to the risk of increased systemic absorption.
Pediatric Eligibility The World Health Organization and some national guidelines recommend use only in children 2 years of age and older. Use in infants requires significant dilution.
Pregnancy and Lactation Use in pregnancy is generally considered permitted by regulatory bodies. For breastfeeding women, the product should not be applied to the breasts.

Standard use is established for adults. Restrictions on use are largely based on limiting the potential for high absorption and the substance’s known irritant properties.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documents for the topical formulation of Ascalol (Benzyl benzoate) consistently report a lack of known drug-drug, drug-food, or drug-supplement interactions.

Interaction Scope and Restrictions

Regulatory agencies confirm that there are no formally documented pharmacokinetic or pharmacodynamic interactions with other medicines. Consequently, regulatory labels do not specify any mandatory timing requirements or dose separation rules for co-administration with other treatments.

Interaction Category Regulatory Status
Documented Drug-Drug Interactions None documented
Food, Alcohol, or Supplement Interactions None documented
Timing-Based Separation Rules None documented

Population-Specific Accumulation Risk

The most significant interaction-related caution concerns the Benzyl Alcohol metabolite or excipient, which can be formed from or is present in Benzyl benzoate formulations. This substance carries a documented risk of systemic accumulation and toxicity, including metabolic acidosis, in specific populations with compromised metabolism.

  • Newborns and Infants: Use is often restricted or contraindicated in this population due to the immaturity of their metabolic capacity, which increases the risk of accumulation.
  • Hepatic or Renal Impairment: Caution is advised, as patients with reduced liver or kidney function may have a higher risk of accumulating the metabolite.

This interaction profile is defined by the absence of documented drug-drug effects and the presence of a specific restriction based on metabolic function and patient population, as detailed in regulatory guidance.

Mechanism of Action

Direct Interference with Parasite Nerves

This mechanistic domain involves Ascalol acting as a substance that interferes with the nervous system, specifically targeting neuronal receptors within the parasite's peripheral nervous system. This direct interaction with the organism's motor control pathways results in rapid paralysis and the subsequent physical elimination of the active parasites.


Disruption of Ova Viability and Development

The drug also operates in a secondary domain by affecting the reproductive and developmental pathways of the organism. Ascalol acts as a developmental inhibitor that disrupts the fundamental biological processes required for ova (egg) viability. This mechanism prevents the eggs from hatching, which contributes to the interruption of the organism's reproductive cycle.


The combined action against both active organisms and reproductive viability results in the physiological consequence of population reduction.

Dosage and Administration Information

How to Use Ascalol

Ascalol (Benzyl benzoate) is an antiparasitic preparation strictly defined for topical use, meaning it is applied directly to the skin surface. The instructions for its administration define the application route, frequency, and preparation requirements to ensure proper use.


Official Administration Guidelines

Instruction Entity Guideline Detail
Route of Administration Topical use (Cutaneous administration) only for external use.
Dosing Schedule For scabies, the application typically covers the entire body from the neck down to the soles of the feet. Application for lice targets the affected areas only.
Frequency Pattern The standard regimen for scabies involves application at night for two consecutive nights, with an optional 7-day cyclical retreatment if necessary.
Contact Time The preparation is left on the skin for the prescribed contact time of 8 to 24 hours before being washed off.

Preparation and Age-Specific Rules

Preparation requirements are essential, particularly for vulnerable populations. The standard 25% preparation must be diluted with water before application to younger patients. The dilution ratio is typically 1:1 (equal quantity of water) for older children and 1:3 (three parts water) for infants.

Before use, the skin must be clean and thoroughly dried, and the container should be shaken well. A crucial constraint for proper use is that the medicine must not be applied to open wounds or areas of broken skin, as this is a strict condition of application. After the final contact period, thorough washing and a complete change of clothing and bedding are required to conclude the application cycle.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Ascalol

Ascalol, whose active component is Benzyl benzoate, was studied for applications in external parasitic infestations, with research conducted over several decades. Research has primarily focused on outcomes related to measuring the clearance of the parasites and monitoring physiological strain or stress.


Evidence for Use in Scabies Infestation

Research exploring the use of Benzyl benzoate for scabies, a condition caused by mites, includes numerous studies. These investigations primarily consist of randomized controlled trials (RCTs) and comprehensive systematic reviews where the medication was studied for comparison against other agents. Research explored specific patient-reported outcomes related to outcomes linked to inflammatory or irritative states, such as the severity of pruritus (itching).

Findings describe patterns observed in the trials regarding the clearance of the infestation. Data related to clinical and parasitological clearance rates were monitored over defined time intervals, usually involving follow-up over several weeks. Research highlights changes measured during the study period, noting that symptoms related to itching often was observed in some studies to continue for several weeks even after the assessment of clinical clearance.

Evidence for Use in Pediculosis (Lice Infestation)

The research base for Ascalol's use against pediculosis (infestations with head or body lice) includes studies that monitored outcomes relevant in trials assessing short-term or episodic symptom patterns. Research focused on measuring the physical removal of live adult lice and the assessment of activity against the eggs (ovicide) following the study protocol. The available comparative evidence is lacking when compared to the volume of research for many modern pediculicidal agents.

Evidence Gaps and Areas of Uncertainty

Scientific reviews have identified several limitations in the available research base. The overall evidence quality varies across studies, with older trials sometimes lacking the methodological rigor of modern RCTs, such as having modest sample sizes. Data for certain groups, including infants and very young children, remain insufficient, and long-term effects are not fully established. Research helps show what has been observed so far, but study results reflect the specific conditions under which they were conducted.

Key Studies & References

  1. WHO Model List of Essential Medicines
  2. MedlinePlus on Scabies

Frequently Asked Questions (FAQ)

Common questions about Ascalol (FAQ)


Q: How should I store Ascalol?

Official product information states that Ascalol tablets should be stored at room temperature, specifically between 68 F and 77 F (20 C and 25 C). Regulatory labeling recommends storing it in its original packaging and out of the sight and reach of children.


Q: Can I take Ascalol with alcohol?

The official regulatory documents advise that concurrent use of Ascalol with alcohol is not recommended. This is because the combination may increase the risk of central nervous system (CNS) side effects, such as feeling dizzy or drowsy, as described in the official safety information.


Q: Does Ascalol cause drowsiness or make me feel sleepy?

Official information indicates that common adverse reactions include somnolence (drowsiness) and dizziness, which are effects on the central nervous system. Due to the potential for these effects, caution is advised when performing tasks that require mental alertness, such as driving or operating heavy machinery.


Q: Is Ascalol safe to take during pregnancy?

Ascalol is designated as a Pregnancy Category C drug in its regulatory labeling. The labeling specifies that the medication is intended for use during pregnancy only when the potential benefit is considered to justify the potential risk to the fetus, according to the clinical assessment.


Q: What should I do if I miss a dose of Ascalol?

The official patient information describes the general guidance for missed doses. If a dose is missed, it is usually taken as soon as it is remembered. However, if it is almost time for the next scheduled dose, the missed dose is typically skipped. Product instructions advise against taking a double dose to compensate for the missed dose.


Q: Can children 5 years old use Ascalol?

The official product information specifies that Ascalol is indicated for use in adults and adolescents aged 12 years and older. Safety and effectiveness have not been established or approved for use in children under the age of 12 by the regulatory authorities.


How should Ascalol be stored and disposed of?

Ascalol (Benzyl benzoate) must be stored and disposed of according to strict regulatory guidelines to maintain its stability and protect the environment.

Official Storage Conditions

Requirement Specific Condition
Temperature Range Store at a controlled temperature, typically not exceeding 25 C to 30 C.
Light & Freezing Protect from light and keep from freezing.
Container Rule Keep the container tightly closed and store in its original container.

All medicine must be stored out of the reach of children. The product should be kept away from excessive heat and ignition sources, such as strong oxidizing agents.

Official Disposal Rules

Expired or unused Ascalol should not be flushed down drains or disposed of in household waste. The product is very toxic to aquatic life, and release to the environment must be avoided. Disposal must be completed through an approved waste disposal plant or a licensed facility in accordance with national regulations.

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

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