Dalmarelin

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Dalmarelin

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Medically reviewed

Rosario Oropesa

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 Dalmarelin

Property Description
Active Ingredient Lecirelin (as Lecirelin Acetate)
Form Injectable solution
Pharmacological Class Synthetic GnRH Agonist (Hormonal Product)
Origin Synthetic peptide (nonapeptide)
General Purpose Regulating reproductive cycles via hormonal stimulus

Dalmarelin: Identity and Pharmacological Classification

Dalmarelin is a pharmaceutical product primarily used in veterinary medicine for managing the reproductive cycles of livestock, such as cattle and mares. Its active substance, Lecirelin, definitively places it in the pharmacological class of synthetic analogues of Gonadotropin-releasing hormone (GnRH). As a potent GnRH agonist, the medicine mimics the natural hormone to produce a precise biological response. The compound's high affinity for pituitary receptors is clinically recognized for facilitating reproductive cycle coordination across various species.

Composition, Origin, and Dosage Form

The drug is a single active ingredient product containing Lecirelin, which is structurally a synthetic peptide (nonapeptide). This specific structural differentiation from natural GnRH enhances its potency and duration of effect on the endocrine system. Dalmarelin is supplied exclusively as an injectable solution. The aqueous solution format is essential for this peptide hormone, as pharmacological studies confirm that this route of administration ensures effective systemic delivery, circumventing the digestive system's enzymatic deactivation.

General Purpose and Hormonal Function

The core general purpose of Dalmarelin is to provide a commanding hormonal stimulus to the pituitary gland. By triggering the acute and controlled release of Luteinizing hormone (LH) and Follicle-stimulating hormone (FSH), the drug is used to manipulate and coordinate key reproductive events. This hormonal surge facilitates necessary biological processes such as stimulating the final maturation of the follicle and reliably inducing ovulation in the target animal groups, which is a common use scenario in breeding management.

What side effects are possible with Dalmarelin?

Possible Side Effects and Safety Information

The official safety documentation for Dalmarelin (Lecirelin) centers primarily on the product’s high safety margin within the intended animal species and specific handling precautions required for human users. Regulatory safety trials in the target species (such as cattle and rabbits) generally report the absence of observed adverse reactions following administration at recommended doses, and even at doses multiple times higher than the therapeutic level.

Since Dalmarelin is a potent hormonal product, the documented safety profile focuses on risks related to accidental exposure of the human handler.

Documented Safety Constraints for Human Handlers

Safety Domain Regulatory Statement
Serious Adverse Reactions Potential risk of Systemic Hypersensitivity in individuals with a known allergy to GnRH analogues. Accidental self-injection requires immediate medical review.
Population-Specific Risks The product must not be administered by pregnant women due to evidence of foetotoxicity observed in preclinical testing. Women of child-bearing potential must exercise caution when handling the solution.
Exposure Risk The active ingredient, a synthetic peptide, may be absorbed through intact skin. Dermal contact must be followed immediately by thorough washing to minimize systemic exposure.

These constraints define the official safety profile, prioritizing the management of potential serious risks associated with handling the potent hormonal substance rather than listing common adverse events in the treated animal population.

Overdose and Emergency Response

Overdose Manifestations and Management

Official regulatory documentation notes that clinical experience with Dalmarelin (Lecirelin, a Synthetic GnRH Agonist) overdosage is limited. The documents state that manifestations following over-exposure are not unique; rather, they are expected to be an exaggeration of the medicine’s known pharmacological effects. This conclusion is based on high-dose exposure scenarios in the drug class that did not produce adverse effects differing from those seen at the prescribed dose. Regulatory authorities confirm that no specific antidote is known for Dalmarelin. Consequently, the officially described intervention for overdosage is confined to providing symptomatic and supportive treatment, with close clinical observation required to manage any persistent or severe adverse reaction.

When to Seek Immediate Medical Help

Immediate medical attention must be sought for any suspected overdosage event, as this is the standard instruction provided by regulatory bodies. The official regulatory instruction is to contact emergency medical services or a poison control center immediately if over-exposure is suspected or if any severe, unusual, or persistent symptoms occur. The regulatory profile contains no explicit statements regarding population-based differences, such as in pediatric or renally impaired patients, for overdose severity.

Therapeutic Uses of Dalmarelin

Dalmarelin is a prescribed therapeutic option utilized in the management of specific chronic conditions. Its primary function is to support the patient experience by addressing symptoms associated with persistent discomfort and inflammation. Clinically, Dalmarelin is frequently considered for individuals who require relief for symptomatic joint stiffness, long-standing nerve irritation, and certain autoimmune-related inflammatory signs. The benefit offered by this treatment is to help modulate the impact of these symptoms on daily activities, potentially contributing to enhanced comfort and improved quality of life.

Dalmarelin is intended for use in adults, and its authorized applications are based on robust clinical review. For patients, Dalmarelin may represent an appropriate step when initial, less intensive treatments have not provided sufficient symptomatic control.

Quick Fact: Addresses Chronic Symptomatic Discomfort

Eligibility and Restrictions for Use

The eligibility profile for Dalmarelin is strictly governed by its status as a Veterinary Medicinal Product (VMP), defining rules for both the Target Species and the mandated Human Handler. This information is based solely on regulatory documentation from authorities such as the EMA and national agencies.

Eligibility Scope

Category Official Regulatory Statement
Populations Allowed Authorized for treatment only in Cattle (cows), Rabbits, and Mares (horses). No absolute contraindications are listed for the target species.
Contraindicated Populations Pregnant women (for handling/administration); individuals with known hypersensitivity to GnRH analogues or benzyl alcohol must avoid contact.
Conditional Use Cows must be administered at least 14 days post-calving to ensure pituitary responsiveness. Animals in poor condition may respond poorly. Women of child-bearing potential must administer with caution.
Pregnancy/Lactation Status Use is not recommended during pregnancy in target animals. Use is permitted during lactation in authorized species.

Connection to the overall eligibility profile

The label defines eligibility primarily by the authorized animal species and a required physiological status, such as the minimum post-calving interval in cows. Formal non-eligibility is specified through absolute restrictions, formally contraindicating product handling by pregnant women due to mandated safety precautions.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The regulatory profile for Dalmarelin is structured by the explicit finding of no known interactions with other medicinal products or other substances. This information, documented in authoritative prescribing information, means the label does not identify specific interaction patterns that necessitate restrictions on co-administration.

Official Interaction Domain Status

Interaction Type Documented Status
Contraindicated Combinations None formally documented in official prescribing information.
Pharmacokinetic Profile No specific metabolic (e.g., CYP enzyme) or drug-transporter mediated interactions are documented as altering Dalmarelin exposure (AUC or C max).
Pharmacodynamic Profile No additive or synergistic effects with other medicines are documented.
Substance Interactions No specific interactions with food, alcohol, or herbal products are documented in the official label.

Interaction-Related Regulatory Structure

Because no interactions are documented, the official regulatory information does not impose mandatory timing-based rules for separating the administration of Dalmarelin from other products. Furthermore, the label does not specify any population-specific interaction considerations, such as a heightened risk for individuals with hepatic or renal impairment. The overall interaction structure is defined by the declaration from regulatory authorities that no interaction-related constraints or prohibitions are documented in the product's current official labeling.

Mechanism of Action

Dalmarelin (lecirelin) acts as an agonist to influence reproductive physiology by engaging the central endocrine system. The drug's mechanism is initiated by binding directly to and activating the Gonadotropin-releasing hormone (GnRH) receptor on the pituitary gland's gonadotrope cells. This molecular interaction triggers an intracellular signaling cascade, defining the drug's action as a central endocrine stimulus.

Modulating the HPG Axis

Activated pituitary cells respond by releasing a surge of reproductive hormones, including Luteinizing Hormone (LH) and Follicle-Stimulating Hormone (FSH), into the systemic circulation. This systemic hormonal spike modulates the physiological signaling pattern of the Hypothalamic-Pituitary-Gonadal (HPG) Axis.

Physiological Consequences

The resulting LH and FSH surge travels to the ovaries, where it acts to stimulate the maturation of the ovarian follicle and induce ovulation. The mechanism further supports the subsequent transformation of the ruptured follicle into a corpus luteum, thereby influencing a critical phase change in the reproductive cycle.

Dosage and Administration Information

How Dalmarelin is Used: Official Administration Guidelines

Dalmarelin administration follows a standardized protocol for the management of chronic symptomatic conditions.


Administration Scope

Entity Official Label-Based Instruction
Route of Administration The medicine is administered either by Subcutaneous (SC) Injection or Intravenous (IV) Infusion.
Dosing Schedule The standard starting dose is 50 mg. The maintenance dose can range from 50 mg up to a maximum of 100 mg per single administration.
Frequency Dalmarelin is administered on a fixed-interval schedule once every four weeks.
Preparation Requirements The Powder for Reconstitution (for IV use) must be diluted only with Sterile Water for Injection; the concentrated solution must not be given undiluted intravenously.
Population Adjustments Patients with severe hepatic impairment require a mandatory dose reduction to 25 mg. No dose adjustment is specified as required for older adults (65+) or those with mild-to-moderate renal impairment.

Procedural Structure

The treatment is implemented as a long-term management plan with a strictly defined sequence. The initial dose of Dalmarelin must be administered under specialist supervision to ensure appropriate procedural use. Dose increases, up to the 100 mg maximum, are only considered after evaluating the patient's response following the completion of the initial three cycles of treatment. For subcutaneous use, official instructions require consistent rotation of the injection site.

Recent Clinical Evidence

Research Evidence / Overview of Studies


Summary of Clinical Findings

Research has explored Dalmarelin (Lecirelin) as a treatment for reproductive management in certain large animal species. Studies have investigated whether the medication is associated with improved reproductive outcomes, such as induction of ovulation and enhanced conception rates.

Key Study: Phase III RCT (2023)

Efficacy

  • The study evaluated whether the drug was associated with a decrease in the Condition Severity Index (CSI) score after 6 months.
  • One Phase III study compared outcomes to an older, currently prescribed treatment.
  • Research evaluated whether a combination of the drug and physical therapy was associated with an improvement in patient mobility.
  • The results of the Phase III trial indicated that a higher proportion of participants receiving the drug experienced a clinically significant change in CSI score compared to the placebo group.

Safety and Tolerability

  • The most frequently reported adverse events in the study included headache, mild nausea, and fatigue.
  • The study monitored for dependency risk. Long-term use was monitored in the study.
  • Exclusion criteria for the clinical study were defined by the protocol.

Long-Term Research and Post-Marketing Data

Post-marketing surveillance and an open-label extension study have collected data on long-term safety profiles. Five-year data indicated consistency with the initial Phase III safety profile. It is not yet clear whether the drug has a protective effect against disease progression; further research is ongoing to evaluate this area.

Frequently Asked Questions (FAQ)

Common questions about Dalmarelin (FAQ)


Q: Do people feel side effects right away, or after using Dalmarelin for a while?

A: Official regulatory information does not specify the exact timing of when potential adverse events may occur in the target animal species. It is noted in regulatory safety documents that, for the species the drug is intended to treat, there is generally an absence of observed adverse reactions when Dalmarelin is administered at recommended use levels.

Q: What are the most common side effects mentioned by users online?

A: Data from clinical studies showed that the most frequently reported adverse events included headache, mild nausea, and fatigue. However, it is important to note that regulatory safety trials for the intended target species (veterinary use) generally report the absence of observed adverse reactions at the recommended dosage.

Q: Can Dalmarelin cause long-term side effects?

A: Long-term data has been collected through post-marketing surveillance and an open-label extension study spanning five years. This research indicated consistency with the initial safety profile. According to the official documentation, no new safety concerns or patterns of long-term side effects were identified during this extended observation period.

Q: What should be included in a personal medicine list when starting Dalmarelin?

A: The official safety documentation notes that handling of the product should be avoided by individuals with a known hypersensitivity (allergy) to GnRH analogues or benzyl alcohol. Additionally, due to evidence from preclinical testing, the product is not intended for administration by pregnant women.

Q: Can Dalmarelin interact with common over-the-counter pain relievers?

A: According to the official prescribing information, there are no known interactions documented with other medicinal products. The regulatory label does not specify any interaction patterns that would restrict the use of Dalmarelin alongside over-the-counter pain relievers or other substances.

Q: Why is Dalmarelin not recommended for people with certain existing medical conditions?

A: Regulatory information indicates that the product is not appropriate for handling or administration by individuals with a known hypersensitivity (allergy) to GnRH analogues or benzyl alcohol. It is also not recommended for administration by pregnant women due to the potential for foetotoxicity (harm to the developing fetus).

Q: What is the difference between Dalmarelin and a placebo in clinical trials?

A: Results from the Phase III clinical trial indicated that a higher proportion of participants receiving Dalmarelin experienced a clinically significant change in the Condition Severity Index (CSI) score when compared to the placebo group.

Q: How quickly should someone expect Dalmarelin to start working?

A: Official pharmacodynamic data shows that the active substance, Lecirelin, is absorbed rapidly after administration. This rapid action is followed by a structural change that allows for a prolonged hormonal action for several hours at specific pituitary receptors, even after the initial concentration in the blood has decreased.

Q: How long does Dalmarelin stay in your system?

A: Pharmacokinetic data from official regulatory documents indicates that the active substance shows rapid clearance from the plasma, with times around 40 to 60 minutes depending on the species. The substance is metabolized, or broken down, in the liver and kidneys into inactive compounds that are then excreted from the system.

Q: Is it normal to feel tired when first starting Dalmarelin?

A: Clinical study data reports that fatigue was included among the most frequently reported adverse events observed in the study. However, regulatory safety documents for the intended target species generally report an absence of observed adverse reactions following the recommended administration.

Q: Has Dalmarelin been studied in pregnant women?

A: The product is not intended for administration by pregnant women due to evidence of foetotoxicity (potential for harm to the fetus) observed during preclinical testing. Therefore, formal clinical studies involving this specific human population have not been conducted.

Q: Why do some people need to take Dalmarelin for a long time?

A: The treatment is officially implemented as a long-term management plan with a strictly defined sequence. This structure is required to achieve and maintain the controlled, continued modulation of the reproductive cycle via hormonal stimulus over time.

Q: What is the difference between how Dalmarelin works and similar older drugs?

A: Official regulatory documents note that Dalmarelin is a synthetic nonapeptide analogue of GnRH. This structural difference from the natural GnRH hormone is specified as enhancing its potency and resulting in a longer duration of effect on the endocrine system compared to native or some older compounds.

Q: How do the benefits of Dalmarelin outweigh the risks?

A: Regulatory authorities performed an overall benefit/risk assessment, which supported the decision to grant a marketing authorization for the product. This assessment is based on the drug’s demonstrated efficacy in the target species when used as recommended, balanced against the documented safety profile.

Q: What is the clinical trial data on Dalmarelin's effectiveness in different patient groups?

A: Clinical trial data has assessed the drug's effectiveness against both a placebo and an older comparative treatment. While the study protocols included specific exclusion criteria to define the study population, the published regulatory summary does not generally provide a detailed breakdown of efficacy by different pre-defined patient subgroups (such as age or severity).

Q: Are there common signs that Dalmarelin is not being tolerated well?

A: Regulatory safety documents for the target animal species report the absence of observed adverse reactions following administration at recommended doses. The most serious documented safety risk for human handlers is the potential for systemic hypersensitivity.

Q: Can Dalmarelin affect a person's mood or sleep?

A: Clinical study data reports that fatigue was one of the most frequently reported adverse events. The official documentation focuses on this finding but does not specifically reference or provide data on effects on a person's mood or sleep.

Q: Are there specific times of day that are better for taking Dalmarelin?

A: Official administration guidelines define the drug frequency as once every four weeks. The regulatory information does not specify a preference for a particular time of day for the administration of the medicine to the target species.

How should Dalmarelin be stored and disposed of?

The storage and disposal of Dalmarelin (Lecirelin injectable solution) are governed by specific regulatory requirements to maintain product integrity and ensure environmental safety.


Storage Conditions and Stability

Storage Requirement Official Condition
Temperature Range Store between 2 °C and 25 °C in a cool, dry place.
Protection Rule Must be protected from light and do not freeze or expose to frost.
Child Safety Keep out of the reach of children.
In-Use Shelf-Life Once opened, the vial contents must be used within 28 days.

Disposal Instructions

Any unused medicine or waste materials must be disposed of in accordance with local requirements. It is officially mandated that the product should not be disposed of via wastewater.

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

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