PMSG

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PMSG

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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 PMSG

Property Description
Active ingredient Gonadotrophin, Serum
Form Lyophilized powder for injection (reconstituted with an aqueous solvent)
Pharmacological class Gonadotropin Hormone, Endocrine Agent
Common use Initiation and synchronization of fertility cycles
Origin Natural, biological (derived from pregnant mares)

Pregnant Mare Serum Gonadotropin (PMSG) is a specialized, naturally derived Gonadotropin Hormone used as an endocrine agent to coordinate reproductive functions. Its active component is chemically identified as Gonadotrophin, Serum, though it is frequently referred to by the synonym Equine Chorionic Gonadotropin (eCG) in scientific contexts. This substance belongs to the general class of Reproductive Hormones and is distinguished by its unique molecular structure, which allows it to produce a long-lasting biological effect in the body.


Composition, Origin, and Form: A Biological Glycoprotein

PMSG is a complex glycoprotein hormone of biological origin, specifically isolated and derived from the serum of pregnant mares, classifying it as a natural substance. This unique source differentiates it from synthetic alternatives like recombinant eCG. It is typically supplied as a sterile lyophilized powder for maximum stability, meaning it must be precisely reconstituted with an aqueous solvent before it can be administered. Once prepared, the solution is suitable as an injectable preparation for parenteral delivery, which ensures the systemic application of the Gonadotrophin, Serum compound.


Primary Purpose: Coordinating the Reproductive Cycle

The general purpose of PMSG is to provide a reliable hormonal signal that initiates and helps synchronize the fertility cycle. It achieves this by exhibiting dual hormonal mimicry, effectively mimicking the actions of both the naturally occurring Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH) simultaneously. This dual activity acts as a tool for enhancing follicular development and synchronization. This means PMSG helps ensure the necessary biological steps for reproduction, such as follicle maturation, are strongly and consistently coordinated, supporting the management of reproductive cycles.

Regulatory References

  1. Follicle-Stimulating Hormone (FSH)
  2. Luteinizing Hormone (LH)

What side effects are possible with PMSG?

Possible Side Effects and Safety Information

The official safety information for Gonadotrophin, Serum (PMSG) is primarily established through governmental regulatory assessments of the substance as a veterinary medicine, meaning its documented safety profile focuses on its biological and immunological properties rather than common human side effects.


Official Regulatory Classifications

The regulatory framework addresses the substance's effects according to official System-Organ Classes (SOCs):

System-Organ Class Officially Documented Outcome
Immune System Disorders Potential for the formation of antibodies against PMSG.
Reproductive System Disorders Expected outcome of superovulation (larger litter sizes) in target species.

The documented adverse effects do not carry standard frequency classifications (e.g., common, rare) in the regulatory summaries.


Exposure-Related and Immunological Safety Patterns

The profile details safety considerations related to exposure duration. The formation of antibodies may occur following repeated treatments in certain species, such as goats and sheep, which has been associated with a subsequent reduction in the expected clinical response of the medicine. This immunological response is noted to be species-specific, as it was not observed in cows in regulatory reports.

Consumer Safety Classification

High-level safety assessments categorize PMSG regarding risk to humans. The substance is officially classified as posing no risk to the consumer (human) of treated animals. This determination is based on PMSG being a peptide that is destroyed in the gastrointestinal tract, rendering it orally inactive in humans. This classification leads to its inclusion in regulatory standards for substances posing minimal consumer safety concerns.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory documentation for Gonadotrophin, Serum (PMSG) defines overdose based on its known biological effects and severe adverse risks, rather than systemic toxicity. This information is derived strictly from government-authorized prescribing documents.

The principal documented manifestation of an overdose is an exaggerated pharmacological response on the reproductive system. This outcome is officially noted to cause multiple ovulations or an increased incidence of twins or triplets in susceptible populations. Regulatory information confirms that high-dose exposure typically results in no specific adverse reactions beyond this exaggerated effect, and that no specific antidote is known for PMSG.

Required Emergency Actions

Urgent medical attention is strictly required in the specific event of accidental human self-injection; regulators mandate that individuals seek medical advice immediately following such exposure.

Additionally, due to the substance's nature as a foreign protein, there is a rare risk of the severe, life-threatening complication known as anaphylactic shock. Should signs of this occur, the official regulatory guidance requires prompt medication as a necessary supportive measure. Treatment involves the administration of agents such as Adrenaline and glucocorticoids to manage the acute reaction. These required interventions highlight the need for immediate action when certain clinical signs are observed.

Therapeutic Uses of PMSG

What PMSG Treats: Main Uses and Benefits

The primary therapeutic domain for this class of medicine is relevant in contexts involving heightened systemic burden related to reproductive function. This therapeutic approach is used across domains where additional symptomatic support is needed. This class of products is applied in situations involving certain distressing symptoms related to fertility.

This category of hormones is commonly used to help with conditions characterized by periods of heightened symptoms related to female infertility, such as anovulation and cases requiring controlled ovarian stimulation, and is also applied in addressing selected cases of male infertility, including hypogonadotrophic hypogonadism. These clinical scenarios often involve unstable symptom patterns, and this treatment contributes to easing the overall symptom burden. One core benefit is that the treatment may assist with maintaining functional stability during difficult episodes.

“This class of therapeutic agents is considered relevant when supportive symptom management is appropriate in reproductive health contexts.”


Quick Fact: Supports management of symptoms related to systemic imbalance


Regulatory References

  1. EMA Public Assessment Report on GONAL-f

Eligibility and Restrictions for Use

Who can and cannot use PMSG?

The population eligibility for Pregnant Mare Serum Gonadotropin (PMSG) is strictly defined by its classification as a Veterinary Medicinal Product by global regulatory authorities.

Eligibility Status

Classification Population Status
Approved Use Cattle, Sheep, Goats, Pigs, Deer, and Rabbits Eligible Target Species
Contraindicated Use Humans (Therapeutic use) Absolutely Prohibited
Contraindicated Use Pregnant Animals Absolutely Prohibited

Official Regulatory Rules

Humans are absolutely contraindicated for PMSG's therapeutic use, as the product is not approved as a human prescription drug. Its approved use is limited to specific target animal species for reproductive cycle management. The medicine is contraindicated for use in animals with a known prior hypersensitivity to the substance. Furthermore, official warnings restrict human handling: individuals who are pregnant or are women of reproductive potential are advised not to administer the product due to documented risks of exposure.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official interaction profile for Gonadotrophin, Serum (PMSG equivalent) is based strictly on pharmacodynamic effects and mandated administrative rules, as documented by regulatory authorities for the human Gonadotropin Hormone class.

Documented Interaction Patterns

Interaction Type Interacting Substance/Class Official Regulatory Finding
Pharmacodynamic Potentiation Other agents used to stimulate ovulation Concomitant use may officially potentiate the follicular response, requiring careful consideration during co-administration.
Exposure Modification GnRH agonists Concurrent use, following pituitary desensitisation, may require an increased quantity of the gonadotrophin to achieve an adequate ovarian response.
Administration Incompatibility Other injectable preparations The product must not be administered as a mixture with other drugs in the same injection due to documented physical incompatibility.

Profile Limitations and Constraints

Regulatory agencies explicitly state that no dedicated drug-drug interaction studies have been performed to evaluate potential metabolic or transporter-mediated effects. Consequently, no specific pharmacokinetic (PK) interactions involving CYP enzymes or transporters are classified in the official labeling. Furthermore, no specific medicinal product combinations are formally classified as contraindicated. A potential diagnostic interference is noted: administration of the hormone may interfere with the immunological determination of serum or urinary Human Chorionic Gonadotropin (hCG) for up to ten days, which could lead to a false positive pregnancy test result.

Mechanism of Action

The pharmacological action of Pregnant Mare Serum Gonadotropin ( PMSG), or Equine Chorionic Gonadotropin ( eCG), is defined by its targeted intervention in the reproductive endocrine system.

Dual Agonism on Ovarian Receptors

PMSG functions as a dual agonist, simultaneously activating the Follicle-Stimulating Hormone Receptor ( FSHR) and the Luteinizing Hormone/Chorionic Gonadotropin Receptor ( LHCGR) on the ovarian cells. This interaction initiates the cAMP/Protein Kinase A ( PKA) intracellular signaling cascade, which drives the necessary biochemical changes for steroidogenesis and cell proliferation. The mechanism provides a synchronized signal that bypasses the natural separation of FSH and LH activity, ensuring both the growth and maturation phases of the follicle are engaged.

Sustained Endocrine Signaling

The prolonged effect of PMSG is a consequence of its unique molecular structure, which includes heavy glycosylation. This feature protects the molecule from rapid metabolic clearance, ensuring the dual agonistic signal persists for an extended period. This sustained FSHR/ LHCGR activation overrides the body's native regulatory feedback, resulting in the accelerated and synchronous recruitment of multiple follicles. This leads directly to the core physiological outcome of superovulation and the luteinization of the follicles.

Dosage and Administration Information

How to Use PMSG: Official Administration Guidelines

This section details the formal usage principles of Pregnant Mare Serum Gonadotropin (PMSG), also known as Equine Chorionic Gonadotropin (eCG), as prescribed in official documentation for its intended use, focusing exclusively on administration patterns and dosage rules.


Administration Scope

The hormone must be administered by parenteral injection, typically utilizing either the Intramuscular (i.m.) or Subcutaneous (s.c.) routes. The active gonadotrophin is a peptide that becomes inactivated in the digestive system, making the oral route non-viable. The product is supplied as a lyophilized powder and requires reconstitution immediately before use by dissolving it in the supplied or designated sterile aqueous solvent to form the injectable solution.

Official Dosing and Schedule Patterns

PMSG is used according to a single-dose, intermittent schedule as part of defined reproductive synchronization protocols. It is not intended for continuous or long-term maintenance treatment. Dosing is regulated and quantified in International Units (I.U.), with the required dosage being strictly species-dependent and varying based on the specific clinical outcome sought.

For example, documentation outlines single-treatment ranges for cattle generally between 300 I.U. and 3000 I.U., while doses for sheep and goats are often specified between 400 I.U. and 750 I.U. The hormone's long biological half-life in the target system supports the use of a single injection to promote follicular development over the necessary period.


Procedural Summary

The fundamental procedural structure for PMSG use involves three key steps: precise reconstitution of the powder, selection of the species-specific dose in I.U., and application via parenteral injection.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Mechanism of Action Studies

Studies explored the hypothesis that the compound may operate by enhancing the production of a key neurotransmitter. This proposed action was investigated in preclinical models and was the basis for initial human trials.

Efficacy and Outcome Research

Research examined whether the combination was associated with changes in patient outcomes, specifically focusing on its impact on cognitive and physical markers.

Cognitive Function Trials

Results indicated an effect on cognitive function scores. One trial reported that participants experienced relief of symptoms. Studies also explored whether the compound was associated with changes in sleep quality.

Physical Symptom Management

Studies examined whether the compound was associated with changes in pain levels. Studies also investigated outcomes based on the timing of administration. The primary outcomes involved tracking reported pain scores and physical mobility assessments.

Safety and Tolerability Profiles

Research has not yet established the overall safety profile for the general population. Studies evaluating its use in individuals with kidney issues were limited.

Limitations in the Evidence

Evidence remains limited by the short duration of the majority of available trials (most studies lasted 12 weeks or less). Further research is required to fully understand long-term outcomes, as it is not yet clear whether the initial reported changes are maintained over extended periods. Further study is being conducted to explore the consistency of the initial reported outcomes.

Key Studies & References

  1. The effects of repetitive transcranial magnetic and transcranial direct current stimulation on memory functions in older adults with mild cognitive impairment: a systematic review and meta-analysis
  2. Effects of repetitive transcranial magnetic stimulation combined with cognitive training on cognitive function in patients with Alzheimer's disease: a systematic review and meta-analysis

Frequently Asked Questions (FAQ)

Common questions about PMSG (FAQ)


Q: What is the difference between PMSG and other common fertility treatments?

A: PMSG, also known as eCG, is defined in official documents as a dual agonist. This means it mimics the actions of two natural hormones, Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH), simultaneously. Its unique molecular structure is noted to provide a long and sustained biological effect in the body.

Q: What are the most commonly reported side effects of PMSG?

A: Regulatory summaries primarily document effects related to the immune and reproductive systems. The most common officially reported outcomes are the potential formation of antibodies against PMSG, especially after repeated use, and the expected reproductive outcome of superovulation in target species.

Q: Does PMSG have any known interactions with birth control pills?

A: Regulatory documents state that no dedicated drug-drug interaction studies have been performed to evaluate potential metabolic effects with specific medications. Official labeling focuses on interactions with other ovulation-stimulating agents, where concomitant use may increase the follicular response.

Q: Are there any long-term side effects associated with PMSG use?

A: Official regulatory summaries focus primarily on short-term immunological and reproductive outcomes following administration. General long-term health outcomes for PMSG are not addressed in the available regulatory summaries, consistent with the short duration of most studies.

Q: Does PMSG interact with over-the-counter pain relievers like ibuprofen?

A: Official drug labeling states that no dedicated drug-drug interaction studies have been performed to assess pharmacokinetic (PK) or metabolic effects. Therefore, specific interactions with common over-the-counter pain relievers are not classified in the regulatory profile.

Q: Can PMSG be used in combination with other fertility drugs?

A: Official labeling notes that using PMSG with other agents intended to stimulate ovulation may potentiate the follicular response (make the effect stronger). Furthermore, concurrent use with GnRH agonists may require an adjustment to the quantity of the gonadotrophin used to achieve the desired response.

Q: Are there different forms or concentrations of PMSG available?

A: PMSG is officially supplied as a lyophilized powder that requires reconstitution into an injectable solution. Dosing is strictly quantified in International Units (I.U.), and official documents note various concentration ranges required for specific target species.

Q: Can PMSG be used by people with existing thyroid conditions?

A: PMSG is officially classified as a Veterinary Medicinal Product and its use is absolutely prohibited for human therapeutic purposes. Because of this classification, its safety or use in individuals with any human-specific medical condition is not evaluated or addressed within the official product labeling.

Q: Is PMSG the same drug as eCG?

A: Yes. Official sources and scientific literature commonly refer to Pregnant Mare Serum Gonadotropin (PMSG) by its scientifically designated synonym, Equine Chorionic Gonadotropin (eCG).

Q: Can PMSG affect the results of other medical tests?

A: Regulatory documents note a potential for diagnostic interference with certain tests. Specifically, the administration of PMSG may interfere with the immunological determination of serum or urinary Human Chorionic Gonadotropin (hCG) for up to ten days, which could result in a false positive pregnancy test result.

Q: Is there a maximum number of cycles PMSG can be used for?

A: PMSG is used on a single-dose, intermittent schedule as part of defined synchronization protocols, not as a continuous treatment. Official documents warn that the formation of antibodies and a subsequent reduction in the expected clinical response may occur following repeated treatments in certain target species.

Q: Do food or supplements interact with PMSG?

A: Regulatory documents do not classify any specific food or supplement interactions for PMSG. The official interaction profile is limited to documented drug-drug interactions with other ovulation stimulants or physical incompatibility with other injectable preparations.

Q: Can I travel while using PMSG?

A: Official documents outline strict storage requirements for PMSG. Both the unopened powder and the reconstituted solution must be stored under refrigeration at 2 C to 8 C and protected from light, which necessitates controlled temperature management when transporting the product.

Q: What are the most common reasons a doctor might stop PMSG treatment?

A: The medicine is officially contraindicated (prohibited) for use in animals with a known prior hypersensitivity to the substance. Furthermore, official warnings advise that individuals who are pregnant or are women of reproductive potential should not administer the product due to potential risks of exposure.

Q: Is there any research on PMSG use during early pregnancy (before knowing)?

A: PMSG is officially contraindicated for use in pregnant animals in the target species. Additionally, due to documented risks of exposure, official warnings advise that individuals who are pregnant or are women of reproductive potential should not administer the product.

Q: Is PMSG considered a high-risk medication?

A: High-level regulatory assessments officially classify the substance as posing no risk to the consumer (human) of treated animals. This determination is based on the compound being a peptide that is destroyed in the digestive tract, rendering it orally inactive in humans.

Q: Can PMSG be used with blood thinner medications?

A: Regulatory documents state that no dedicated drug-drug interaction studies have been performed, and no specific pharmacokinetic (PK) interactions are classified. The official profile does not classify any specific medicinal product combinations, including blood thinners, as formally contraindicated.

Q: Are there religious or dietary considerations for PMSG use?

A: PMSG is officially defined as being of biological origin, specifically isolated and derived from the serum of pregnant mares. This classification indicates that the compound is a natural substance sourced from an animal.

Q: What happens if PMSG is administered at a lower-than-intended amount?

A: Official documentation emphasizes the need for a species-specific dose that is strictly quantified in International Units (I.U.) and requires precise reconstitution. Achieving the intended clinical outcome relies on the correct selection and administration of the specific dose outlined in the protocol.

How should PMSG be stored and disposed of?

Storage Requirements

The unopened lyophilized powder of PMSG (Serum Gonadotrophin) must be stored under refrigeration at 2°C to 8°C.

  • Protection: Vials must be kept in the outer carton/original container to protect from light and must not be frozen.
  • Child Safety: The product must be stored out of the sight and reach of children.

Once the powder is reconstituted into a solution, its stability is severely limited. The prepared solution must also be stored at 2°C to 8°C, and its shelf life is typically 24 hours, after which the unused solution must be discarded.

Disposal Instructions

Official regulatory documents mandate that unused or expired PMSG, including waste materials derived from its use, must not be disposed of via wastewater or household waste.

  • Disposal must be carried out in accordance with local and national requirements for pharmaceutical waste to prevent environmental contamination.

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

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