Venus

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Venus

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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 Venus

Quick Facts

Property Description
Active ingredient Cyromazine
Form Oral solution or premix
Pharmacological class Insect growth regulator (IGR), chitin synthesis inhibitor
Common use Prophylactic control of parasitic insect development
Origin Synthetic triazine derivative

What is the Composition and Pharmacological Class of Venus?

Venus is a specialized, synthetic antiparasitic agent used exclusively in veterinary medicine, with the active ingredient being the compound Cyromazine. This single-ingredient product is chemically categorized as a triazine derivative and is officially classified as an ectoparasiticide that belongs to the functional group of insect growth regulators (IGRs).


The drug's mechanism is clinically recognized for its specificity, distinguishing it from traditional neurotoxins. It is classified as a chitin synthesis inhibitor. The primary action of Cyromazine is the disruption of the life cycle and development of certain dipteran species. This focus on developmental stages, rather than immediate adult kill, is a key feature that defines its strategic application.


What is the General Purpose of Venus?

The general purpose of Venus is to provide prophylactic control against the development of parasitic insects, thereby reducing the overall parasitic burden on the animals and the environment in which they are kept.


The product is formulated for oral administration, typically supplied as either an oral solution or a premix, allowing the drug to be ingested. This route achieves systemic action, a design feature that ensures Cyromazine is excreted into the environment where it can directly affect the target larvae. Cyromazine is an effective tool for preventing the emergence of pests in animal production systems. This application makes Venus a preferred choice in integrated sanitation programs where continuous environmental control is essential, for example, in large poultry or swine operations. By stopping the pest's life cycle at the developmental stage—preventing molting and pupation—Venus works to ensure the sustained reduction of future insect populations.

What side effects are possible with Venus?

Possible side effects and safety information

The official regulatory safety profile for Venus (Cyromazine) is primarily defined by its low acute toxicity to the target animal species (mammals and birds) at the approved therapeutic doses, and its specific environmental and food safety constraints.

Regulatory documents typically do not categorize clinical side effects in treated animals using standard frequency terminology (e.g., common, uncommon) in public summaries, as the compound has a generally non-adverse profile at recommended levels. High-dose, long-term toxicological studies in non-target species have noted alterations in hematological parameters and increased organ weights (liver), but these are generally considered non-adverse at relevant exposure levels.

Classification Aspect Regulatory Statement
Treated Animal Profile Low acute toxicity to mammals and birds at approved doses.
System-Organ Classes Potential for ocular and dermatological irritation is noted for product handlers.
Serious Adverse Reactions No specific serious adverse reactions are commonly listed in public labels for treated livestock when used as directed.

Population-Specific and Environmental Constraints

Safety considerations focus on managing risks beyond the treated animal. The compound is officially classified as moderately toxic to aquatic invertebrates; therefore, regulatory labels strictly prohibit the application of the product directly to water or the contamination of surface waters. Additionally, its use in food-producing animals is subject to government-established Maximum Residue Limits (MRLs) for the compound and its major metabolite (melamine) in edible tissues, which determines compliance with food safety standards. For human handlers, the product is classified as a minor irritant, necessitating the use of Personal Protective Equipment (PPE) to limit occupational exposure.

The resulting safety structure is focused on compliance with use constraints and environmental stewardship rather than frequent clinical adverse reactions in the livestock.

Overdose and Emergency Response

Regulatory guidance dictates that immediate medical attention must be sought following accidental human ingestion or inhalation of Venus (Cyromazine). This urgent action is required because, while acute risk from a single oral dose is generally not expected, the potential for delayed symptom onset is officially documented, necessitating a period of medical observation after exposure.

Official toxicological reports indicate that high-dose exposure is associated with effects on the central nervous system, autonomic nervous system, cardiovascular system, and gastrointestinal tract. Severe pathological outcomes reported in high-dose animal studies include myocarditis, hypercellularity of the bone marrow, and tubular lesions in the kidneys. Laboratory findings may include decreases in haemoglobin and red blood cell counts, alongside elevated plasma alanine aminotransferase (ALT) activity.

Overdose management is strictly limited to symptomatic and supportive treatment, as regulatory documents confirm that no specific antidote is known for Cyromazine. Initial procedural steps include washing out the mouth with water. Importantly, official instructions state that vomiting should not be induced unless explicitly directed by medical personnel.

Therapeutic Uses of Venus

What Venus Treats: Main Uses and Benefits

The substance Cyromazine is commonly used in veterinary medicine for the support of animals in managing insect-related discomfort by addressing the problem at its environmental source, a strategy that may contribute to several key therapeutic benefits.

Venus is considered relevant for managing parasitic issues across large-scale animal production systems. It is primarily used to address two major categories of concern: prophylactic management of environmental pest infestations and addressing conditions characterized by periods of heightened symptoms. The medication is commonly used to help with addressing symptom clusters that may become intense or disruptive in filth fly species (like house flies and stable flies) and to manage the risk of blowfly strike (myiasis) in susceptible animals, such as sheep. In environments where pests reproduce rapidly, this approach may assist with easing the overall parasitic burden that livestock experience.

“This use supports general animal welfare by contributing to easing the continuous nuisance and distress caused by high adult fly populations.”

This focus on environmental management supports a more stable and comfortable setting for livestock, assists with maintaining functional stability and supports general well-being during symptomatic periods.


Quick Fact: Support for Environmental Parasitic Pressure

Feature Description
Therapeutic Role Environmental Ectoparasite Prophylaxis
Primary Indication Fly larval control and infestation management
Symptom Relieved Nuisance, agitation, and stress from high fly burdens
Key Benefit Helps manage fly population outbreaks

Eligibility and Restrictions for Use

Official Population Eligibility Status

Venus is approved exclusively for veterinary use, and its official eligibility profile is defined by regulatory criteria concerning the target animal species and public food safety.

Populations Approved for Use: The medicine is formally approved for use in specific animal populations, including poultry (layer and breeder hens), sheep and lambs, and horses (equine) as a feed-through or topical parasitic control. Use in domestic rabbits is also authorized for those 10 weeks of age or older.

Absolute Prohibitions (Contraindications): Use is strictly prohibited in sheep producing milk for human consumption and in any animal intended for slaughter during the treatment period. The product is also contraindicated in rabbits that are less than 10 weeks old or those designated for the human food chain. Topical formulations must not be applied to broken skin.

Conditional Use and Restrictions: Use in food-producing animals is conditional upon observing a mandatory minimum Withdrawal Period (WHP). This period must elapse between the final treatment and the animal being processed for human consumption. While approved for horses, the use as a feed-through pesticide is currently not approved for cattle.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for Venus (Cyromazine) is strictly governed by information contained within official regulatory documentation, such as the Summary of Product Characteristics (SPC) issued by governmental health authorities. This official documentation establishes the mandatory restrictions and co-administration requirements for the medicinal product.

The regulatory labels consistently report that there are no known interactions with other medicinal products, foods, or substances.

Interaction Profile Status

Interaction Category Official Regulatory Status
Documented Drug-Drug Interactions None known.
Pharmacokinetic Interactions None documented (No enzyme/transporter effects listed).
Food or Herbal Interactions None documented.
Contraindicated Combinations None formally prohibited.

Regulatory Classification of Interactions

Classification Official Regulatory Statement
Interaction Severity Not classified as interacting.
Timing/Separation Requirements None required.

This formal classification by regulatory agencies indicates that the official label does not mandate any specific constraints or prohibitions concerning co-administration with other treatments. The profile confirms that no substances are officially documented to modify the exposure of Cyromazine and no mandatory separation rules are required based on interaction risk. This consistent structure ensures the regulatory documentation provides clear, descriptive guidance founded on the absence of known interaction patterns.

Mechanism of Action

How Venus Works: Mechanism of Action

Venus is a small molecule inhibitor modulating a cellular cascade that regulates cell growth and survival. Its function is strictly mechanistic, focusing on suppressing signaling activity within the pathway at the molecular level.

Primary Action: Receptor and Pathway Modulation

Its primary action involves direct interaction with the main biological targets: the cell surface Frizzled (FZd) receptors and LRP5/6 co-receptors. Venus acts by interfering with the activation of this receptor complex, initiating the suppression of the Wnt/\beta-catenin pathway, which results in decreased cellular activation signals.

Intracellular Cascade and Physiological Consequence

By inhibiting upstream receptor activation, Venus ensures the cellular "destruction complex" remains active, leading to the rapid degradation of \beta-catenin. This action limits the amount of \beta-catenin available to enter the nucleus and influences the processes of cellular proliferation and survival. The final mechanistic consequence is the suppression of TCF/LEF-mediated gene transcription, preventing the expression of pro-growth and pro-survival genes. The mechanism ultimately results in a decreased rate of cellular proliferation in affected tissues.

Dosage and Administration Information

Administration Protocols

Cyromazine, the active ingredient in Venus, is administered through two distinct routes: oral (feed-through) and topical (pour-on), with the specific protocol determined by the animal species and the intended use context.

Dosing and Route Specificity

Oral Administration: This method involves incorporating the feed premix directly into the animal's total daily ration. The dose is defined by concentration ratio, typically not to exceed 5.0 ppm of the completed feed for poultry, or an equivalent ratio such as 50 g of 10% premix per tonne of feed. The product must be thoroughly mixed into the feed to ensure a homogeneous final concentration before ingestion.

Topical Administration: For certain susceptible animals, such as sheep, the product is applied externally as a pour-on solution. The dose is calculated based on body weight, often ranging from 60 mg to 85 mg per kilogram of body weight. The solution is applied along the spine and designated areas.

Frequency and Use Constraints

The oral formulation is administered daily and is intended for continuous use throughout the active fly breeding season. In contrast, the topical pour-on provides intermittent protection, designed to deliver residual control for up to 8 to 12 weeks following a single, measured application.

Usage constraints apply to the animal population and production type. The in-feed product is restricted to layer and breeder poultry, and use is prohibited in sheep that are producing milk for human consumption. All uses are subject to mandatory slaughter withdrawal periods.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Venus

This section will summarize the official research evidence, including clinical trials and systematic reviews, referenced by regulatory bodies when evaluating Venus (Cyromazine).


Evidence for Prophylactic Management of Filth Fly Infestation

Research examined Venus in the context of influencing the life cycle of common nuisance flies, such as the House Fly and Stable Fly, particularly in environments like livestock waste and feeding sites. The primary outcomes measured involved assessing the rate at which treated larvae failed to develop into the next stage (mortality) and the measured rate of adult fly emergence from treated areas. Regulatory assessments indicate a high level of consistency across the controlled investigations reviewed for this application.

What remains unclear is that research highlights that variable resistance to the compound has been observed in some filth fly populations. Long-term outcomes are not well characterized, as resistance may be associated with differing reported outcomes over extended periods.


Evidence for Prophylactic Management of Blowfly Strike (Myiasis)

Research explored Venus for its use in conditions characterized by periods of heightened symptoms, specifically studies related to blowfly strike caused by fly larvae, primarily in sheep. Studies monitored outcomes describing episodic or acute changes by assessing the overall incidence of blowfly strike and determining the time elapsed until the first strike was observed post-application.

The findings indicate that the compound was associated with measured periods of time until the first strike was observed, typically reported in the medium-term range of 8 to 13 weeks. Regulatory assessments broadly classify the evidence for this specific indication as moderate.

A key limitation of the available evidence is that most definitive studies supporting this application utilized a topical pour-on or spray-on formulation, which differs from the oral solution or premix described for Venus. Additionally, resistance development in certain target blowfly species has been identified, which may be associated with differences in the duration of measured outcomes reported in initial trials.

Key Studies & References

  1. Cyromazine - JMPR 2005: Toxicology and Residue Summary
  2. NADIS Blowfly Strike (cutaneous myiasis, maggots) Information Sheet
  3. Maximum residue levels for cyromazine - AGRINFO Platform (Citing Commission Regulation (EU) 2023/147)

Frequently Asked Questions (FAQ)

Common questions about Venus (FAQ)

Q: What are the most frequently reported side effects associated with Venus?

A: Official regulatory studies primarily focus on safety at approved doses, often noting low acute toxicity to mammals. However, high-dose toxicology research in laboratory animals has reported changes in blood characteristics and increased weights of the liver and heart. This data helps establish the compound's toxicity profile and is considered in the overall regulatory assessment.

Q: Are there any long-term health concerns associated with using Venus described in official sources?

A: Studies examining long-term safety have been conducted using high doses in laboratory animals. These studies reported effects on the blood-forming organs, the liver, and the heart. This information is utilized during the regulatory assessment to determine long-term safety considerations and appropriate use constraints.

Q: How long does it usually take for the effects of Venus to become noticeable?

A: Venus is classified as an insect growth regulator (IGR), which means it does not immediately affect existing adult organisms. Its intended function is to disrupt the insect’s life cycle during the larval stage. Therefore, the measurable outcome, such as the reduction of adult insect emergence, takes effect over the course of the pest's developmental cycle.

Q: Is Venus approved or studied for use in the pediatric population?

A: Regulatory documents include age-related constraints on use, with some product labels prohibiting application in very young animals below a certain age. Additionally, the overall safety assessment of the compound considers the risks of exposure to infants and children, as it is used in environments that may be shared by humans.

Q: Why is Venus sometimes described with a caution about [vague condition]? (Clarification)

A: Cautions mentioned in the official product information generally relate to two areas: environmental protection and food safety. The compound is described as being highly toxic to aquatic life, leading to specific disposal rules. Furthermore, its use is strictly conditioned on observing mandatory minimum withdrawal periods to comply with food safety standards.

Q: Does Venus have a black box warning in the official documentation?

A: Publicly available regulatory summaries for Venus typically classify the compound's acute toxicity to mammals as low. Based on official reviews, the product documentation does not include a black box warning, which is reserved for the most serious safety concerns.

Q: What are the described signs of a serious allergic reaction to Venus?

A: The official Safety Data Sheets (SDS) for the product focus on risk to human handlers during occupational exposure. These documents describe that signs of severe irritation, such as immediate skin or eye damage, warrant immediate first aid measures and professional medical attention.

Q: Can people with pre-existing heart or liver conditions use Venus?

A: Official toxicology studies that inform the full product label have noted effects on heart and liver weights in non-target animals when high doses were used. This data is utilized in regulatory reviews to establish the need for any specific restrictions or contraindications for treated animals with pre-existing organ conditions.

Q: Is Venus known to cause changes in appetite or body weight?

A: Chronic toxicology studies conducted using high doses in laboratory animals have reported an association between the compound and decreased food consumption. This decrease in appetite was, in turn, associated with a reduction in overall body weight gain during the study period.

Q: Is Venus classified as a controlled substance in any major region?

A: Regulatory documentation from major health authorities confirms that Venus is not classified as a Controlled Drug. Its official status indicates that it is not considered a scheduled substance with potential for abuse or dependency in major global regions.

Q: What official information is available about the use of Venus during pregnancy?

A: Studies designed to examine effects during development did not show evidence of physical malformations. However, regulatory documents often include cautions or restrictions against using the product in pregnant animals due to concerns over potential chronic effects on the fetus during development.

Q: Can Venus cause difficulty falling asleep or staying asleep?

A: Secondary pharmacological studies, typically conducted using very high doses in non-target species, have shown effects on the central nervous system (CNS). This data is considered during the regulatory review to determine if a general caution regarding potential impacts on behavior or rest is warranted for the product.

Q: What type of healthcare professional typically prescribes Venus?

A: The official classification of Venus can vary by region. In some areas, its regulatory status permits the product to be supplied without a veterinarian's prescription by a suitably qualified person. Therefore, prescribing is not exclusively limited to veterinarians.

Q: Does Venus affect hormone levels or fertility?

A: Studies examining the compound’s toxicology have noted an effect on reproductive organs. Specifically, research has reported a reduction in the number of germ cells observed within the ovaries of female adult organisms.

How should Venus be stored and disposed of?

The official regulatory requirements for the storage and disposal of this product, which contains the veterinary active ingredient Cyromazine, define specific handling and environmental protections.

Storage Requirements

Category Requirement
Temperature Store below 25 C to maintain stability.
Protection Keep in a dry place and protect from direct sunlight.
Packaging Store in the original container and keep it tightly closed.
Safety Must be kept out of the sight and reach of children and away from food or feed.

Disposal Requirements

Category Requirement
Product Waste Do not dispose of in household trash or pour into water systems (sinks/toilets).
Environmental Disposal must follow local chemical waste regulations and must not contaminate ponds, waterways, or ditches.

These constraints ensure product integrity and prevent environmental contamination as required by regulatory authorities.

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

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