Enzaprost

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Enzaprost

Treatment option: Hydrocephalus, Weakness

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 Enzaprost

Quick Facts

Property Description
Active ingredient Dinoprost (Prostaglandin F2alpha)
Form Sterile solution for injection
Pharmacological class Prostaglandins F, Uterotonic agent, Luteolytic agent
General Purpose Reproductive cycle management and control
Origin Chemically naturally occurring, synthetically manufactured

Enzaprost: Identity, Chemical Class, and Form

Enzaprost is a specialized, single-ingredient medicine whose active component is Dinoprost, chemically defined as Prostaglandin F2alpha (PGF2alpha). This substance is systematically classified as a uterotonic agent and a luteolytic agent within the Prostaglandins F pharmacological class. The preparation is consistently supplied as a sterile solution for injection, a differentiating feature necessary for an agent that must produce immediate and predictable physiological effects via the parenteral route. The Dinoprost utilized is frequently stabilized as the salt form Dinoprost tromethamine.

Is Dinoprost a Natural or Synthetic Compound?

While the Dinoprost molecule is chemically identical to the Prostaglandin F2alpha substance that occurs naturally within the body, the active ingredient utilized in the pharmaceutical preparation is manufactured synthetically under strict quality control standards. This controlled synthesis is necessary to ensure consistent potency and concentration. The final composition is an aqueous solution, designed to be isotonic, containing the active ingredient along with stabilizing excipients. This makes Dinoprost a reliable standard, used similarly to other popular PGF2alpha preparations.

What is the General Therapeutic Purpose of Uterotonic Agents?

The general therapeutic purpose of a drug classified by its dual uterotonic and luteolytic actions is to provide precise physiological control over the reproductive cycle. The uterotonic effect achieves this by causing forceful myometrial stimulation (contraction of the uterine muscles), while the luteolytic effect induces the functional regression of the corpus luteum. This capability is often applied in a neutral scenario, such as reproductive cycle synchronization.

Regulatory References

  1. European Pharmacopoeia Monograph (Dinoprost)

What side effects are possible with Enzaprost?

Possible Side Effects and Safety Information

This section describes the officially documented adverse effects and safety characteristics of Dinoprost (Enzaprost), based strictly on regulatory classifications published by government health authorities. The terminology and frequency classifications are consistent with official prescribing information.


System-Organ Classes and Frequency

Adverse reactions are formally classified according to the systems they affect. Many reported effects are linked to the generalized smooth muscle stimulating action of the active ingredient, Dinoprost (Prostaglandin F2alpha).

System-Organ Class Common Adverse Reactions Other Documented Adverse Reactions
Gastrointestinal Disorders Vomiting, Diarrhea Nausea
General Disorders Pyrexia (fever), Flushing Shivering/Chills, Headache
Cardiovascular/Respiratory Tachycardia (increased heart rate) Bronchospasm
Administration Site Pain at the injection site -

The gastrointestinal reactions, including vomiting and diarrhea, along with pyrexia and flushing, are consistently classified as common in government labeling. The onset of transient pyrexia is sometimes noted to occur within the first hour of administration.


Serious Adverse Reactions and Safety Constraints

Regulatory documents highlight specific conditions and reactions that pose significant risk, often necessitating caution or contraindication.

  • Serious Reactions: The potential for Bronchospasm and life-threatening Hypersensitivity Reactions (e.g., Anaphylaxis) is documented in official prescribing information.
  • Organ Impairment: Caution is advised in individuals with pre-existing cardiac disease, pulmonary disease, renal impairment, or hepatic impairment, as the systemic effects of prostaglandins can affect these systems.
  • Contraindications: Use is strictly contraindicated in individuals with a known hypersensitivity to prostaglandins or any component of the formulation, and in patients with a history of major uterine surgery.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory information describes overdose (overexposure) to Dinoprost as an exaggeration of the drug’s known pharmacological effects.

Documented Manifestations and Serious Risks

Classification Manifestation/Risk
Exaggerated Local Effects Severe uterine hypertonus (over-contraction) and gastrointestinal hyperactivity (nausea, vomiting, diarrhea).
Severe Systemic Risks Life-threatening bronchospasm and the potential for elevated systemic blood pressure (hypertension).

Required Emergency Actions

Regulatory documents mandate that individuals seek immediate medical attention or contact emergency services immediately upon the suspicion of overexposure or the appearance of any severe, systemic symptoms, particularly respiratory distress. Overexposure to Dinoprost is considered a serious event, and continuous hospital monitoring is required for managing these acute effects.

Management and Specific Considerations

No specific pharmacological antidote is known for Dinoprost overdose. Management is constrained to providing symptomatic and supportive treatment to address clinical manifestations, such as respiratory or cardiovascular compromise. A specific population consideration is noted: individuals with pre-existing asthma or other respiratory problems are at an extreme risk for severe acute reactions following systemic exposure.

Therapeutic Uses of Enzaprost

Enzaprost (Dinoprost) is generally used within specialized contexts, applied in clinical settings that involve regulating the reproductive cycle. The primary therapeutic focus is aligned with areas where short-term symptom management is appropriate, helping address symptoms linked to organ-specific functional stress.

The medication is commonly used to address symptoms associated with acute or episodic changes, such as the absence of visible heat signs (silent heat), or applied in cases involving inflammatory conditions like pyometra and chronic metritis. This provides support that helps ease the overall symptom burden by assisting with the expulsion of pathological contents.

It is also relevant in contexts involving planned obstetrical intervention; for example, it is commonly used to help with coordinating delivery timelines, such as the scheduled induction of parturition (farrowing). Furthermore, it offers therapeutic assistance in cases of complicated pregnancy failures, such as situations requiring pregnancy termination or aiding the expulsion of mummified fetuses, which assists with maintaining functional stability.

Quick Fact: Relief for Reproductive Dysfunctions
Primary Benefit Contributes to easing the overall symptom load by supporting the expulsion of contents.
Common Scenarios Used in controlled breeding programs and for managing chronic uterine infection.
Symptom Type Addresses symptoms linked to organ-specific functional stress.

Regulatory References

  1. NIH DailyMed label information for dinoprost

Eligibility and Restrictions for Use

Enzaprost is a veterinary medicinal product containing dinoprost and is strictly not for human use. Official regulatory documents define eligibility and contraindications for its target species and impose specific restrictions on human handlers.

Eligibility and Contraindications for Animals

The product is explicitly authorized for use only in Cattle (cows, heifers) and Pigs (sows, gilts). Use in any other animal species is not permitted. The medicine is formally contraindicated and must not be administered to animals suffering from either acute or subacute disorders of the vascular system, gastro-intestinal tract, or respiratory system.

Use is also contraindicated in pregnant animals unless the specific medical objective is to induce parturition (birth) or interrupt the pregnancy. Animals with a known hypersensitivity to the active substance (dinoprost) or any excipient must not be treated.

Restrictions for Human Handlers

Due to the risk of the active substance being absorbed through the skin, resulting in possible bronchospasm or miscarriage, official labeling imposes strict restrictions on who should handle the product. Pregnant women, women of child-bearing age, asthmatics, and people with bronchial or other respiratory problems must not use the product or must wear impervious gloves to avoid contact.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory documentation structures the interaction profile of Dinoprost (the active ingredient in Enzaprost) around specific pharmacodynamic patterns and administration restrictions. No clinically relevant pharmacokinetic interactions involving CYP enzymes or drug transporters are documented in the regulatory labeling.

Pharmacodynamic Interactions and Restrictions

Co-administration with other medicines that stimulate uterine activity is formally constrained due to a significant risk of additive effects.

Interaction Type Interacting Product Category Official Regulatory Statement
Additive/Synergistic Effect Uterotonic Agents (e.g., Oxytocin, Ergometrine) Co-administration is documented to enhance the effect of Dinoprost and increase the risk of side effects.
Antagonistic Effect Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) Combination is officially noted to decrease the therapeutic efficacy of Dinoprost.

Because of the documented potential for enhanced uterotonic effects, regulatory authorities advise a restriction that concurrent use of Dinoprost with other potent uterotonic agents is not generally recommended. There are no explicitly stated contraindicated combinations, food, alcohol, herbal, or population-specific interaction considerations documented in the official regulatory sections for this product.

Mechanism of Action

The mechanism of action for Enzaprost (Dinoprost) operates through two primary biological domains: direct activation of smooth muscle tissue and induced regression of an endocrine gland. The drug’s mechanistically linked physiological effects stem directly from these specific molecular interactions.


Targeted Smooth Muscle Excitation via the FP Receptor

Dinoprost acts as an agonist at the Prostaglandin F2alpha Receptor ( FP receptor) on specialized smooth muscle cells, including those of the myometrium. This binding triggers the immediate G q/ 11 protein signaling cascade, resulting in the rapid mobilization of intracellular calcium ( Ca^2+). This molecular event directly leads to myometrial hyper-contractility, the mechanism's primary physiological consequence.


Endocrine Tissue Regression Through Induced Apoptosis

A parallel action occurs on the cells of the corpus luteum ( CL), which also express the FP receptor. Here, the same Ca^2+ signaling cascade initiates a different physiological outcome: apoptosis (programmed cell death) within the glandular tissue. This process causes the functional and structural regression of the CL, resulting in a profound and rapid decline in the secretion of the hormone progesterone, thus influencing the endocrine status of the reproductive system.

Dosage and Administration Information

How Enzaprost is Used: Administration Guidelines

Enzaprost, containing the active ingredient Dinoprost (Prostaglandin F2alpha), is administered as a sterile solution following strict, species-specific protocols. The general principle of its use is to provide a precise, parenteral dose for the purpose of reproductive cycle management.


Administration Scope and Dosing

Scope Standard Instructions
Route of Administration The required method is an Intramuscular (IM) injection, although the Subcutaneous (SC) route is an alternative for cattle and is specified for horses in certain regimens. The Intravenous (IV) route is strictly forbidden.
Dosing Schedule The administered quantity varies based on the target species. For cattle, the standard dose is 25 mg Dinoprost (e.g., 5 mL). For pigs, the dose for parturition induction is typically 10 mg Dinoprost (e.g., 2 mL).
Frequency Pattern Usage is either a single course for acute needs or cyclic/intermittent, such as two doses given 10 to 12 days apart for synchronization protocols.

Procedural and Contextual Constraints

The medicine is supplied as a sterile solution requiring no preparation or dilution before administration. Instructions mandate that the procedure includes the use of aseptic technique when withdrawing the dose from the vial to maintain sterility. For administration to pigs, the dose for inducing parturition is scheduled to be given specifically within 3 days (72 hours) of the estimated normal farrowing date. Dosing is determined by the specific reproductive objective and species; product labels do not specify adjustments based on systemic conditions like renal or hepatic impairment.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Enzaprost

This section summarizes the research conducted on Dinoprost (Enzaprost), using neutral language to describe what has been studied and what remains unclear in the scientific literature. Findings describe group patterns, not personal outcomes, and this research provides context but not individual predictions.


Evidence for Use in Reproductive Cycle Synchronization

Research explored the use of Dinoprost in controlled field trials and randomized studies primarily involving normally cycling cattle and horses. These studies were applied in research contexts involving fluctuating or unstable symptoms, specifically monitoring outcomes related to the measured change in the corpus luteum (CL) over time and how the drug was observed in research exploring the timing of the reproductive cycle.

Studies monitored measured changes in CL function that were observed following administration over defined time intervals. Some data show patterns related to final pregnancy rates within coordinated breeding programs. The measurements described were observed in contexts where initial diagnostic accuracy of a functional CL was monitored, which is a factor that can vary in field conditions.

Evidence for Use in Uterine Content Evacuation

Dinoprost was studied for its use in managing conditions associated with acute or disruptive episodes, such as chronic uterine infections (pyometra) and retained fetal remnants (mummified fetuses). The research examined outcomes related to physical discomfort and the measured expulsion or clearing of pathological contents from the uterus.

Studies examined measured patterns related to the evacuation of uterine contents that were observed in the study populations. Studies typically reported the drug was used as an adjunct alongside other care strategies, such as antibiotics, evaluated in the research. It is important to note that comparative evidence is lacking to distinguish its effect from the effects of the concurrent supportive therapies that were also administered.

What is Still Uncertain About the Research Evidence

This final section synthesizes known limitations in the research record. Long-term effects are not fully established across all indications, particularly concerning the sustainability of reproductive health, as follow-up durations were limited in many initial studies. Evidence quality varies across studies due to differences in field management and diagnostic practices. The evidence highlights what is known — and what is still uncertain — and suggests that research is ongoing.

Key Studies & References

  1. LUTALYSE STERILE- dinoprost tromethamine injection, solution - DailyMed - NIH (Drug Label Information)
  2. FREEDOM OF INFORMATION SUMMARY ORIGINAL NEW ANIMAL DRUG APPLICATION ANADA 200-253 ProstaMateTM (dinoprost tromethamine injection)

Frequently Asked Questions (FAQ)

Common questions about Enzaprost (FAQ)

Q: What is Enzaprost used for specifically?

A: Enzaprost is a specialized medication used to stimulate the uterus. Official product information states that it is indicated for specific clinical purposes related to reproductive health, such as inducing labor near term or managing certain uterine conditions. Its use is restricted to specific clinical settings that require close medical supervision.

Q: Is Enzaprost a type of hormone treatment?

A: The active ingredient in Enzaprost is Dinoprost, which is a form of prostaglandin. Prostaglandins are lipid compounds that are naturally produced in the body and act like powerful, localized hormones. This action contributes to the drug's intended action of stimulating smooth muscle tissue.

Q: Does Enzaprost need to be taken long-term?

A: According to official product information, Enzaprost is not a medication intended for chronic or long-term use. It is typically administered as a single, acute course or for a very short, specific duration to achieve a clear medical objective. Due to the drug's nature, patients typically remain under observation for a period of time after administration.

Q: Can Enzaprost be used by people with kidney issues?

A: Regulatory documents indicate that Enzaprost should be used with caution in individuals who have a history of kidney disease. Furthermore, some specific formulations of the drug are considered contraindicated (meaning they should not be used) in patients with active or known kidney impairment. The decision regarding use is determined by a healthcare provider based on a careful assessment of the patient's condition.

Q: Is Enzaprost a medication that prevents a condition or treats it?

A: The medication is primarily understood as a treatment or management tool rather than a preventive medication. Its primary purpose is to actively stimulate the uterus to initiate specific biological processes, such as the onset of labor, according to a clinical need.

Q: Does Enzaprost have any known effects on fertility?

A: While the drug is used to manage the reproductive cycle for acute purposes, official documents indicate that the long-term effects of Dinoprost on subsequent fertility have not been fully established. For this reason, its use is restricted to specific medical circumstances as determined by clinical need.

Q: Is Enzaprost considered an NSAID?

A: No, Enzaprost is not classified as a nonsteroidal anti-inflammatory drug (NSAID). It is an oxytocic agent, which is a substance that acts to stimulate the smooth muscle of the uterus. NSAIDs, in contrast, work by reducing the body's natural production of prostaglandins.

Q: Is Enzaprost a controlled substance?

A: Based on the regulatory status of its active components, Enzaprost is not classified as a controlled substance in the United States. It is a prescription-only medicine because of its mechanism of action and the need for medical supervision during its use.

Q: How quickly does Enzaprost start working?

A: According to the clinical pharmacology summaries, the onset of action is relatively fast. Slight uterine contractions may begin within about 10 minutes of administration. The highest concentrations of the drug in the blood are typically reached within the first hour.

Q: What is the expected duration of the effects of Enzaprost?

A: The drug's action is generally short-lived due to its rapid metabolism. Uterine contractions may continue for 2 to 3 hours after a single administration. However, some specific delivery systems are designed to release the medication gradually over a longer period, sometimes up to 24 hours.

Q: Is it normal to feel tired after starting Enzaprost?

A: The regulatory labels do not commonly list general tiredness or fatigue as an adverse reaction. However, some patients may experience transient systemic effects like headache or fever/chills. If these occur, they may be associated with a feeling of being generally unwell.

Q: Do the side effects of Enzaprost usually go away after a while?

A: Studies indicate that the active ingredient is rapidly metabolized by the body, meaning it is quickly broken down and eliminated. For this reason, transient side effects generally tend to diminish quickly, typically within a few hours after the drug has been fully cleared or the delivery system has been removed.

Q: Is nausea a common side effect reported for Enzaprost?

A: Yes, official product information lists nausea and vomiting among the most frequent side effects reported. This adverse reaction is understood to occur due to the medication’s effect on smooth muscle tissue, including that in the gastrointestinal tract.

Q: Does Enzaprost cause weight gain?

A: According to regulatory documents, weight gain is not listed as a common or reported adverse reaction associated with the use of this medication.

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

A: Since Enzaprost is used as an acute, short-term intervention, most known effects are immediate. Post-marketing reports, however, mention a rare, increased risk of a serious clotting disorder called Disseminated Intravascular Coagulation (DIC) in certain high-risk patients (such as those over 35 or with prolonged pregnancy) following labor induction.

Q: Is Enzaprost safe to use with high blood pressure medication?

A: Official warnings state that the medication should be used with caution in individuals who have a history of either high blood pressure (hypertension) or low blood pressure (hypotension). The drug itself can cause temporary changes in blood pressure, which is why close monitoring is required.

Q: Are there any common over-the-counter medicines that interact with Enzaprost?

A: The most significant interactions noted in regulatory warnings are with other potent drugs that stimulate the uterus, known as oxytocic agents (such as oxytocin). General over-the-counter medicines are not prominently noted, but it is recommended that patients disclose all prescription and non-prescription medicines and supplements to the administering healthcare provider.

Q: Does consuming grapefruit affect Enzaprost?

A: Based on regulatory-based summaries, there are no known interactions between the active ingredient and foods or drinks, including grapefruit.

Q: Is it okay to use Enzaprost if I drink alcohol occasionally?

A: The official product label does not contain a specific warning regarding alcohol interaction. However, because the drug is exclusively administered in a controlled hospital setting under strict medical supervision for acute conditions, alcohol consumption is typically not applicable or permitted during the administration period.

Q: Is Enzaprost appropriate for older adults?

A: The therapeutic use of this drug is highly specialized and specific to obstetrics and reproductive health. Therefore, official product information indicates that its use is not applicable to the general elderly patient population.

Q: What population groups are warned about using Enzaprost?

A: Regulatory precautions warn against use, or advise caution, in patients with a history of conditions such as asthma, high intraocular pressure (glaucoma), or certain underlying cardiac, pulmonary, renal, or liver diseases.

Q: Can women use Enzaprost?

A: Yes, the drug is specifically indicated for use in women for purposes related to managing pregnancy, labor induction, or pregnancy termination, as outlined in the regulatory indications.

Q: Is Enzaprost safe to use during pregnancy (as described in official documents)?

A: Yes, the drug is specifically indicated for use during pregnancy to address certain clinical needs, such as labor induction or termination/evacuation purposes. Its use is limited to these specific regulatory indications and is performed only under continuous medical supervision.

Q: Does Enzaprost have a black box warning in the US?

A: Yes, the FDA requires that certain formulations of this drug carry a Boxed Warning (the most serious warning). This is because it is a potent agent that must be used only by trained personnel in a hospital with immediate access to intensive care and surgical facilities, due to the potential for serious, adverse medical events.

Q: What kind of research has been done on Enzaprost?

A: Research and clinical studies have focused on confirming its efficacy and safety as an oxytocic agent, meaning it acts to stimulate uterine contractions. This research supports its use for labor induction, cervical ripening, and the termination of pregnancy.

Q: Are there studies that talk about patient experiences with Enzaprost?

A: Official product information includes data collected from both formal clinical trials and ongoing post-marketing surveillance reports. This documentation includes patient-reported outcomes and adverse reactions that are reviewed as part of the ongoing safety process.

Q: Why is Enzaprost used in a hospital setting sometimes?

A: Regulatory labels require that the medication be administered only in a hospital setting. This is necessary because the drug is a potent uterine stimulant and its use requires immediate access to intensive care and surgical facilities due to the potential for serious complications like uterine rupture and fetal distress.

Q: What should I do if I think I'm having an allergic reaction to Enzaprost?

A: Official warnings state that serious hypersensitivity reactions, including anaphylaxis (a severe, potentially life-threatening allergic reaction), have been reported. If an allergic reaction is suspected, the healthcare team will likely remove the delivery system immediately (if applicable) and initiate appropriate supportive therapy.

Q: Is it possible to become dependent on Enzaprost?

A: According to regulatory information, Enzaprost is intended for acute, short-term intervention only. There are no known risks of physical dependence or addiction associated with its use.

Q: Why does Enzaprost require a prescription?

A: This classification is required because the drug's mechanism of action necessitates strict administration protocols and continuous supervision by a medically trained professional.

Q: How is Enzaprost different from a placebo in clinical trials?

A: Clinical trial data indicate that Enzaprost is an active pharmacological agent. Unlike a placebo, which has no direct effect, the drug causes a significant increase in the tone and contraction frequency of the uterus, leading to the desired clinical effects of labor or cervical ripening.

Q: Does Enzaprost affect the results of common blood tests?

A: Regulatory documents do not provide a direct list of common blood tests affected. However, the administration of the drug is associated with careful monitoring for complications like Disseminated Intravascular Coagulation (DIC), which requires continuous monitoring of blood clotting factors.

Q: Are there specific times of day Enzaprost is typically taken?

A: Administration is governed by a clinical protocol based entirely on the patient's individual medical response and the clinical objective being pursued. Its administration is not determined by a specific time of day (such as morning or evening).

Q: Is it true that certain foods should be avoided while on Enzaprost?

A: Based on regulatory-based summaries, there are no known interactions between the active ingredient, Dinoprostone, and any specific foods or drinks.

Q: Is it safe to drive or operate machinery while taking Enzaprost?

A: Driving or operating machinery is not applicable during treatment. The drug is administered in a controlled hospital environment, and patients typically remain under close medical observation.

Q: Can a person stop taking Enzaprost suddenly?

A: The use of Enzaprost is controlled by healthcare professionals. Cessation of the drug's effect is managed either by the drug being naturally and rapidly metabolized by the body, or in the case of a vaginal delivery system, by physical removal if clinical circumstances require it.

Q: Are there any special patient monitoring requirements when using Enzaprost?

A: Yes, continuous patient monitoring is a required part of the administration protocol. This includes carefully monitoring uterine activity, fetal status, and cervical changes to ensure the patient and fetus are not experiencing any undesirable responses to the medication.

How should Enzaprost be stored and disposed of?

How to Store and Dispose of Enzaprost

The storage and disposal requirements for Enzaprost (Dinoprost) are defined by official regulatory labeling to maintain the product's stability and ensure safe handling.

Official Storage Requirements

Scope Item Official Requirement
Temperature & Protection Do not freeze the solution. Store in the original container, protected from light.
In-Use Stability The vial, once first punctured (broached), must be stored not above 25°C (77°F).
Shelf-Life The in-use shelf-life is 14 days or 12 weeks (depending on the specific label) after the first puncture, provided it is stored correctly.
Safety Precaution Must be kept out of the sight and reach of children.

Disposal

Any unused product or waste materials must be disposed of in accordance with local requirements. Medicines must not be disposed of via wastewater or household trash.

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

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