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De Poezepil

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De Poezepil

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Method of action: Endocrine Therapy

Treatment option: Anorexia, Cachexia, Cancer, Breast Cancer

Medically reviewed

Marina Burgos

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.

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Overview of De Poezepil

De Poezepil is an oral veterinary pharmaceutical designed for the hormonal management of the reproductive cycle in female cats (felines). It is classified as a powerful hormonal preparation containing a single, potent active ingredient, addressing the general purpose of estrous cycle control. The preparation is entirely synthetic, meaning the core chemical compound is manufactured rather than derived from a natural source.

Quick Facts Description
Active Ingredient Megestrol acetate (MA)
Form Tablet (Oral formulation)
Pharmacological Class Synthetic Progestin / Progesterone Receptor Agonist
Common Use Estrus suppression / Delayed heat
Origin Synthetic Compound

Identity and Composition: What Type of Medicine is De Poezepil?

De Poezepil is a single-ingredient tablet containing the active substance Megestrol acetate (MA). This compound is chemically defined as a steroidal progestin, meaning its structure is derived from the steroid backbone, similar to natural hormones. It is pharmacologically classified as a Synthetic Progestin.

As an oral formulation, the tablet provides a measured and accessible way to administer the synthetic compound to the veterinary patient. Megestrol acetate functions as a highly effective progesterone receptor agonist, a compound that chemically mimics the effects of the natural hormone progesterone within the body. Chemically, Megestrol acetate is a synthetic progestogen used for various hormonal applications.


Pharmacological Class and General Purpose

The drug’s pharmacological function centers on its role as a Synthetic Progestin, primarily employed to achieve estrus suppression and delayed heat. This action involves sending a strong negative feedback signal to the brain, which leads to the essential pituitary inhibition required to prevent the initiation of the fertile cycle. This mechanism is clinically recognized for temporarily preventing the reproductive cascade in felines.

The general benefit is the ability to provide targeted, pharmacological estrous cycle control in felines, offering a temporary tool for reproductive management. Progestins, including Megestrol acetate, are used for the purpose of delaying estrus in female cats. De Poezepil is often identified by veterinary professionals in specific regions as a reliable, established oral form for this need in companion animals, differentiating it from injected or non-hormonal alternatives.

Regulatory References

  1. Megestrol: MedlinePlus Drug Information
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What side effects are possible with De Poezepil?

Possible Side Effects and Safety Information

The safety profile of De Poezepil (Megestrol acetate) is defined by official regulatory documents that classify potential adverse reactions based on system-organ class and frequency of occurrence. This information is derived from government health authority summaries of product characteristics.


Officially Documented Adverse Reactions

Adverse reactions associated with the use of this medicine are classified into specific frequency tiers:

Classification Effects Reported in Official Labeling
Occasionally Lethargy, increased appetite, and subsequent weight gain.
Very Occasionally Mammary hypertrophy (enlargement of mammary tissue).

These effects primarily involve the Metabolism and Nutrition Disorders (increased appetite, weight gain), General Disorders (lethargy), and Reproductive System and Breast Disorders (mammary hypertrophy, possibility of endometrial changes).


Serious Safety Considerations and Constraints

The regulatory profile identifies specific safety limitations and serious risk domains. A serious consideration associated with the progestogen class is the possibility of endometrial changes, which is noted in the official labeling.

Time- and Duration-Related Safety: The occurrence of mammary hypertrophy is explicitly linked to long term use of the drug. This effect is described as being distinct from mammary neoplasia and may show regression upon cessation of dosing.

Population-Specific Constraint: The medicine is subject to a strict safety constraint: it is not recommended in diabetic animals. Furthermore, use in pregnant animals requires specific management, including withdrawal prior to expected parturition, due to the regulatory-defined potential for inhibition of labor.

This structure ensures that safety communication covers predictable metabolic effects while highlighting duration-dependent and population-specific risk boundaries as defined by regulatory authorities.

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Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory information for De Poezepil (Megestrol acetate) overdose focuses on specific clinical manifestations and mandated emergency actions. Overexposure may present with documented signs involving the nervous, cardiovascular, and gastrointestinal systems.

Documented Overdose Presentations

System Official Regulatory Statement
Central Nervous System Drowsiness, tremor, fatigue, profound sedation, and convulsions (seizures).
Cardiovascular/Respiratory Tachycardia (rapid heart rate) and shortness of breath (dyspnea).
Gastrointestinal Disturbances, including nausea and vomiting.

Required Emergency Actions

The regulatory profile mandates that immediate medical attention must be sought upon suspicion of overexposure or the onset of any of the listed severe manifestations. Professional assessment is required for urgent situations, especially those involving profound sedation or convulsions.

Treatment is entirely symptomatic and supportive, as no specific antidote is known for Megestrol acetate overdose. Regulatory guidance allows for procedures like the administration of activated charcoal or gastric lavage, based on clinical judgment regarding recent ingestion. Hospital monitoring may be required until symptoms fully resolve.

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Therapeutic Uses of De Poezepil

What De Poezepil Treats: Main Uses and Benefits

De Poezepil is commonly used in areas where short-term symptom management is appropriate for unspayed female cats, primarily targeting symptoms related to heightened physiological activity of the estrus cycle. The medication is indicated for the postponement or prevention of oestrus. This function provides support that helps ease the overall symptom burden of signs like excessive vocalization and restlessness, and may assist with maintaining functional stability when surgery is delayed.

The medication is also applied across domains where additional symptomatic support is needed for conditions involving inflammatory or irritative processes, including eosinophilic granuloma complex and miliary dermatitis. This use is relevant for managing symptoms that interfere with daily functioning, such as irritation and discomfort in these skin conditions, and symptoms that create noticeable physiological strain in supportive care contexts.

“This medication is commonly used to help with managing the physical and behavioral symptoms that cluster during active heat episodes.”

Quick Fact Supports Symptom Management
Primary Use Estrus-related symptoms that interfere with daily functioning
Secondary Use Symptoms related to inflammatory or irritative states
Supportive Benefit Symptoms that create noticeable physiological strain
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Eligibility and Restrictions for Use

De Poezepil, which contains the progestin megestrol acetate (MA), is an oral medication with official veterinary use for estrus (heat cycle) control and specific skin or behavior conditions in cats (queens) and dogs (bitches and male dogs), depending on the country's official labeling.

Regulatory documents establish clear populations for whom the medicine is restricted or prohibited. The medicine must not be used (is contraindicated) in animals with a known history of hypersensitivity or allergy to megestrol acetate, and it is strictly forbidden in pregnant animals.

Contraindicated Populations

Official regulatory documents require that this medicine must not be used in animals presenting with certain pre-existing systemic conditions, including:

  • Uterine disease or abnormal uterine bleeding
  • Diabetes mellitus (sugar diabetes)
  • Breast tumors or a history of mammary neoplasia
  • Thromboembolic disease (blood clots)

Additionally, the medicine is not recommended for use in bitches prior to their first estrus cycle or in male dogs intended for breeding. Use in lactating animals or in cats with known viral infections requires special caution, as the drug passes into milk and effects are unknown.

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What should I know about interactions with other medicines?

Interactions with other medicines and products

The interaction profile for this product is officially documented based on two primary mechanisms: the co-administration of agents that affect how the body processes the product and the concomitant use of agents that share similar effects on the body’s systems.

Key Interaction Domains

Interacting Product Category Practical Implication
Strong Enzyme Inducers May significantly decrease the product's concentration, potentially diminishing its intended effect.
Strong Enzyme Inhibitors May significantly increase the product's concentration, potentially raising the risk of adverse effects.
Products Affecting Coagulation Requires close monitoring due to the potential for additive effects on blood clotting factors.

Official Interaction Statements

  • Co-administration with certain anti-seizure medicines, such as carbamazepine or phenobarbital, is documented to significantly reduce exposure to this product and may necessitate strict monitoring.
  • Strong inhibitors of the cytochrome P450 enzyme system, including certain antifungal agents like ketoconazole, can increase product concentrations, requiring clinical oversight.
  • This product's use may impact laboratory markers related to endocrine and liver function, which should be considered when interpreting diagnostic test results while receiving treatment.

Regulatory documentation requires healthcare providers to assess all concurrent medication use before and during treatment to manage the risk of therapeutic failure or increased systemic exposure.

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Mechanism of Action

The mechanism of De Poezepil involves the pharmacological action of Megestrol acetate (MA) as a Progesterone Receptor (PR) agonist, which initiates a targeted, reversible alteration of the reproductive cycle. MA's direct binding and activation of PRs in the central nervous system (hypothalamus and pituitary gland) induce a strong negative feedback loop. This action suppresses the signaling hormones Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH) that drive the cycle, halting the delivery of signals needed for ovarian follicular maturation and preventing the hormonal surge that initiates estrus. Concurrently, MA exerts a local effect by activating PRs in reproductive tract tissues. This peripheral modulation causes the uterine lining to adopt a secretory appearance and increases the viscosity of the cervical mucus. This tissue-level effect complements the central suppression, contributing to the physiological interruption of the natural cycle cascade. However, the mechanism's activity is biologically constrained: if follicular development is already advanced, high estrogen levels can partially override the central negative feedback, illustrating a limitation where the suppressive action is attenuated by an intense hormonal surge.

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Dosage and Administration Information

How to Use De Poezepil

De Poezepil, an oral tablet containing megestrol acetate, is administered strictly through the oral route for cycle management and supportive care in female cats. The usage protocol consists of specific fixed milligram dosages and frequencies that are tied to the intended clinical goal.


Dosing Regimens and Schedules

The required dosage and frequency are highly dependent on the purpose of administration. The medicine is prescribed based on a fixed milligram amount per cat, not a weight-dependent calculation.

Usage Purpose Dosage (Per Cat) Frequency and Duration Pattern
Postponement of Oestrus 2.5 mg Once weekly, used for up to 30 weeks.
Prevention/Suppression of Oestrus (Acute) 5 mg Once daily, administered for three consecutive days.
Initial Skin Conditions 2.5 mg to 5 mg Every two to three days until lesion regression.
Maintenance Skin Conditions 2.5 mg Once weekly or fortnightly to prevent recurrence.

Contextual Administration Timing

Proper use of the medicine for cycle control requires administration to be synchronized with the animal’s reproductive phase. For the long-term postponement of oestrus regimen, the first dose must be initiated only when the cat is confirmed to be in anoestrus (the non-breeding season). Conversely, when employing the acute, three-day regimen for oestrus prevention, the initial administration must begin immediately upon observing the signs of calling. No specific instructions regarding administration with food or special preparation requirements are indicated.

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Recent Clinical Evidence

Research evidence / Overview of studies

Overview of Investigation and Early Trials

Studies evaluated the compound's influence on the body’s inflammatory response and Factor A activity. Initial laboratory research explored potential actions of the combined treatment in affecting cellular signaling pathways. This work primarily used in vitro models and animal studies to characterize the basic activity of the compound.


Clinical Research Summary

Phase I and II Trials

The earliest human trials primarily focused on the characteristics of the compound's initial human exposure and tolerance in healthy volunteers, with secondary measures related to pharmacokinetics. These trials typically involved small cohorts (n < 50). Phase II research then began to expand to smaller patient groups to investigate potential changes in reported pain and inflammation levels. Research also included assessments to understand how different dosages were processed by the body. Research also included measurements related to the timing of observed activity at the various dose levels evaluated.

Phase III Studies

Large-scale Phase III trials (n > 500) were conducted to gather more extensive data on the compound’s activity over a period of 12 weeks.

  • Symptom Assessment: Research investigated effects on symptom levels over the 12-week study duration. The primary endpoint for these studies was the change in a validated patient-reported symptom score from baseline to week 12.
  • Quality of Life Measures: Secondary endpoints included measures related to patient quality of life and general well-being.
  • Comparative Analysis: The studies compared the compound's activity to that of older treatments.

Further Research Exploration

Studies investigated the relationship between the compound and biomarkers related to the underlying cause by examining plasma samples over the 12-week study duration. Research evaluated the compound’s use for severe cases. Findings from these biomarker analyses are preliminary and ongoing.

Key Studies & References

  1. Study of De Poezepil Activity on Factor A and Inflammatory Markers in Animal Models
  2. Phase I Clinical Trial of Safety, Tolerance, and Pharmacokinetics of Compound in Healthy Volunteers
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Frequently Asked Questions (FAQ)

Common questions about De Poezepil (FAQ)

Q: Is the medication De Poezepil known by any other name internationally?

A: The active substance in this medication is Megestrol acetate (MA), which is the internationally recognized generic name for the compound. This generic name is consistently used across all official regulatory documents from authorities like the FDA and EMA to define the chemical identity of the medicine.

Q: Why do some forums discuss different dosages of De Poezepil?

A: Official regulatory documentation provides a range of fixed milligram dosages and frequencies. This difference is directly related to the specific medical purpose for which the medicine is being administered. For instance, the dosage required for the long-term postponement of the estrous cycle is different from the dosage used for acute suppression.

Q: How does De Poezepil compare to older medicines used for the same general purpose?

A: Studies supporting the regulatory approval of De Poezepil involved direct comparisons to older treatments for the same general purpose. Official summaries indicate that researchers investigated the compound's effects on key symptoms and patient quality of life relative to these existing options. The results of these comparative analyses contributed to the established understanding of the medicine's profile.

Q: When can someone generally expect to feel the intended effects of De Poezepil?

A: The official product information specifies different schedules for use, such as an acute, short-term regimen versus a long-term postponement regimen. Regulatory-reviewed research included studies dedicated to measuring the timing of when the observed effects begin and how the body processes the compound. This research informed the development of the administration guidelines that dictate when the initial dose should be given.

Q: What should I be aware of regarding interactions between De Poezepil and supplements?

A: Official interaction statements focus on categories of products that affect the compound’s concentration in the body or impact blood clotting factors. Because some dietary supplements may fall into these categories—especially those affecting metabolic enzymes or coagulation—it is consistent with best practice to disclose all concurrent use when suitability is being assessed.

Q: Does De Poezepil interact negatively with common over-the-counter pain relievers?

A: Regulatory documents advise caution when using De Poezepil alongside products known to influence blood clotting factors. Since some common over-the-counter pain medications may have this effect, it is considered an area requiring awareness. Official documentation notes that co-administration may necessitate strict monitoring or clinical oversight.

Q: Is De Poezepil appropriate for use by older adults?

A: The official veterinary product information does not provide specific restrictions for use in older or geriatric patients, as the main contraindications relate to pre-existing conditions and life stage. However, general pharmacological principles noted in human medicine, which also uses this compound, suggest that dose selection for older individuals should be cautious, considering the potential for age-related changes in organ function.

Q: Is there published evidence regarding the long-term use of De Poezepil?

A: Yes, the safety profile specifically addresses the potential effects associated with prolonged administration of the medicine. For instance, the occurrence of mammary hypertrophy (enlargement of mammary tissue) is explicitly linked to longer-term use of the drug. Clinical research has also been conducted to gather data on the compound's activity and safety over study durations up to 12 weeks.

Q: Are most of the clinical trials for De Poezepil focused on the main approved use?

A: De Poezepil has multiple established uses, including estrus control and specific skin or behavior conditions. Large-scale Phase III studies investigated the compound's effects on general symptom levels. The research focus aligns with the scope of the medicine's multiple approved indications.

Q: What happens if I stop using De Poezepil suddenly?

A: Official warnings address the potential for adrenal insufficiency when a patient is withdrawn from chronic therapy involving this compound. This risk is related to the drug’s pharmacological effect on the body’s hormone regulation system, specifically the hypothalamic-pituitary-adrenal (HPA) axis. Regulatory warnings state that close surveillance may be indicated during and after long-term use due to this potential risk.

Q: Is there research evidence supporting the use of De Poezepil in diverse populations?

A: Regulatory documents confirm that large-scale Phase III trials were conducted to collect extensive data on the medicine’s activity in patient cohorts. The official summaries state the studies involved broad patient groups, though they do not provide specific details on the breakdown of racial or ethnic diversity within the subject population.

Q: How does De Poezepil affect the liver or kidneys?

A: The product's use may impact lab results related to both endocrine and liver function markers. Additionally, official documents for the compound caution that reduced liver or kidney function should be taken into account when assessing a patient, particularly older individuals.

Q: Are changes in mood or sleep listed as possible side effects of De Poezepil?

A: The official product information for felines lists lethargy (a lack of energy or tiredness) as an occasionally reported effect. Furthermore, authoritative regulatory documents for the compound in human use also report adverse reactions that include mood changes, depression, anxiety, and trouble sleeping.

Q: What is the role of De Poezepil in a comprehensive treatment plan?

A: De Poezepil is established as a targeted hormonal intervention. Its role in a treatment plan is to provide pharmacological control for the estrous cycle or to help manage specific skin and behavior conditions, depending on the indication. It is classified as a powerful hormonal preparation containing a synthetic progestin.

Q: What should be done if an interaction with another medicine is suspected?

A: Regulatory documents indicate that professional assessment of all concurrent medication use is a necessary part of defining the interaction profile. They state that the co-administration of certain medicines may necessitate strict monitoring or clinical oversight. This is to manage the potential risks of the treatment failing or of an increased systemic exposure to the compound.

Q: What general expectations should a patient have regarding follow-up while using De Poezepil?

A: Official warnings note that close surveillance may be indicated for any patient receiving this treatment. Monitoring is specifically recommended to watch for potential complications, including issues related to adrenal function, diabetes, and changes in mammary tissue. This close monitoring supports safe use, particularly during chronic therapy.

Q: Is De Poezepil a controlled substance?

A: Megestrol acetate, the active ingredient in De Poezepil, is generally not classified as a controlled substance under the regulatory scheduling of agencies like the US Drug Enforcement Administration. Its use is subject to standard prescription requirements but does not carry the added restrictions of a scheduled drug.

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How should De Poezepil be stored and disposed of?

Storage Requirements

Official regulatory documentation requires De Poezepil (Megestrol acetate tablets) to be stored under controlled environmental conditions to maintain product stability and safety. The product must be stored below 25^circC (77°F) and must be protected from light.

Storage Condition Requirement
Maximum Temperature Store below 25^circC
Light Protection Required

Shelf-Life and Safety

The shelf-life of the product is 3 years as packaged for sale, provided the storage requirements are met. For safety, the medicine must be stored out of the sight and reach of children.

Disposal Instructions

Unused or expired De Poezepil must be disposed of in accordance with local requirements for pharmaceutical waste, as defined by official regulatory instructions.

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

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