Nalador

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Nalador

Method of action: Other Gynecologicals

Treatment option:

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 Nalador

What is Nalador?

Nalador is a synthetic analogue of prostaglandin E2 containing the active substance sulprostone. It is a specialized medicinal product used in obstetric and gynecological care. As a prostaglandin derivative, it acts by stimulating the smooth muscles of the uterus, leading to rhythmic contractions.

Therapeutic Purpose

The primary function of Nalador is to induce uterine activity in specific clinical situations. It is utilized in hospital settings for the management of serious obstetric complications and for the termination of pregnancy when medically indicated. Its pharmacological design allows for targeted action on the uterine tissue to facilitate the evacuation of the uterine cavity.

Clinical Applications

Nalador is employed in several distinct medical scenarios:

  • Induction of Labor: It is used to induce labor in cases of intrauterine fetal death.
  • Management of Hemorrhage: It is indicated for the treatment of severe postpartum uterine hemorrhage (atony) when conventional treatments have proven insufficient.
  • Medical Termination: It is used for the termination of pregnancy in the second or third trimester when there are maternal or fetal health indications.

Mechanism of Action

Sulprostone, the active component, mimics the effects of naturally occurring prostaglandins. When administered, it binds to specific receptors in the myometrium (the muscular layer of the uterine wall). This binding triggers a cascade of cellular events that results in cervical softening and potent uterine contractions, which are necessary to achieve the desired clinical outcome.

Regulatory References

  1. obstetrics and gynecology
  2. Uterotonic Agent
  3. Prostaglandin E2 Analog
  4. intravenous
  5. parenteral

What side effects are possible with Nalador?

Possible Side Effects and Safety Information

Nalador's safety profile, documented in official regulatory sources, is defined by adverse reactions that affect both the target organ (uterus) and other smooth muscle systems. Side effects are classified by their reported frequency:


Frequency-Classified Adverse Reactions

Classification System-Organ Class Examples of Documented Effects
Very Common (ge1/10) Gastrointestinal & Nervous Nausea, Vomiting, Headache
Common (ge1/100 to <1/10) Gastrointestinal, Musculoskeletal, Skin Diarrhea, Back pain, Flushing
Frequency Not Known Cardiac, Vascular, Pregnancy, Immune Cardiac arrest, Uterine rupture, Disseminated Intravascular Coagulation (DIC), Anaphylactic shock, Uterine hyperstimulation, Hypotension

Serious Adverse Reactions and Safety Constraints

The most serious, though rare, events listed in regulatory documents include cardiac arrest, uterine rupture, and severe systemic reactions like anaphylactic shock and DIC. The potential for excessive, sustained contractions, or uterine hyperstimulation, is a major safety consideration inherent to its function as a potent uterotonic agent.

Population-Specific Constraints

Official labeling imposes explicit restrictions on use in individuals with pre-existing conditions. Nalador is contraindicated in patients with severe or uncontrolled cardiovascular or vascular disease, including uncontrolled hypertension, due to the documented risk of serious cardiovascular events. Use is also restricted in patients with pre-existing conditions like severe hepatic or renal impairment and bronchial asthma. Administration must occur solely via the intravenous route in specialized clinical settings with continuous monitoring.

Overdose and Emergency Response

The official regulatory profile for Nalador (Sulprostone) overdose is defined by the severe exaggeration of its core pharmacological activity as a potent uterotonic agent. Overdose manifestations are documented to include uterine hyperstimulation, characterized by excessive and potentially tetanic uterine contractions. Systemically, the overdose presents with signs of Cardiovascular System Instability, specifically hypertension (increased blood pressure) and tachycardia (elevated heart rate). These severe physiological changes indicate a risk of serious cardiopulmonary complications.

Upon recognition of any manifestation of overdose or acute distress, regulators mandate that immediate medical attention must be sought, and the infusion must be discontinued immediately. The official guidelines confirm that treatment is symptomatic and supportive since no specific antidote is known for Sulprostone overdose. Management focuses on emergency stabilization, which requires continuous cardiac monitoring and blood pressure monitoring. Supportive care includes pharmacological intervention, such as specific agents for managing hypertension, and procedures to resolve the uterine hyperstimulation to maintain overall patient stability.

Therapeutic Uses of Nalador

What Nalador Treats: Main Uses and Benefits

Nalador (Sulprostone) is applied in clinical settings that involve acute or unstable symptom patterns within obstetrics and gynecology. Its use is commonly considered relevant for managing specific, high-risk symptomatic domains where the failure of the uterus to perform its required mechanical function creates noticeable physiological strain. Its primary purpose is relevant for easing symptoms in critical situations where additional support for symptom management is needed.

This medication is commonly used to help with conditions presenting with acute episodes, primarily including severe postpartum hemorrhage linked to uterine atony, symptoms related to systemic imbalance after delivery, and facilitating medically required uterine evacuation in cases such as retained placental tissue or intrauterine fetal death.

Quick Fact: Relief for Uterine Functional Stress

Nalador provides support that helps ease the overall symptom burden associated with a weak or unresponsive uterus. It assists with maintaining functional stability during episodes of severe bleeding by promoting the vital therapeutic action of restoring effective uterine tone. This helps manage the symptom clusters of muscle failure and supports general well-being during a challenging phase.

Regulatory References

  1. WHO recommendations on Uterotonics for PPH

Eligibility and Restrictions for Use

Nalador (Sulprostone) is approved for use exclusively in adult women for specific procedures in obstetrics and gynecology. Regulatory documents establish clear eligibility boundaries based on a patient's pre-existing conditions and age.

Eligibility Status Official Population Rule
Contraindicated (Must Not Use) Use is prohibited in individuals with a known hypersensitivity to prostaglandins, severe cardiovascular disorders, or uncontrolled hypertension. The medicine is also contra-indicated in patients with active pelvic inflammatory disease and in cases where an increase in uterine contractions is medically prohibited, such as after previous Caesarean section or major uterine surgery.
Conditional Use (Caution Required) Patients with severe hepatic impairment or severe renal impairment are permitted use only under explicit caution. Special monitoring is also required for individuals with a history of bronchial asthma or glaucoma, as specified in the official labeling.

Age and Reproductive Status: The medicine is permitted during pregnancy for its labeled indications (medically required uterine evacuation and postpartum hemorrhage). Regulatory documents note that use in the pediatric and geriatric populations is not established due to the drug's specialized indication and lack of specific safety and efficacy data in those age groups.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Nalador (dihydroergocristine), an ergot derivative, can interact with numerous other medicinal products, primarily through two main mechanisms: pharmacodynamic synergy, which affects blood vessel function, and pharmacokinetic alteration, which affects drug levels in the body.

Documented Interaction Categories

Product Category Clinical Outcome / Mechanism
Vasoconstrictive Agents (e.g., Triptans, other Ergot Derivatives, beta-blockers like Acebutolol) Increased risk of severe vasoconstriction and elevated blood pressure. The combined effect of these agents on blood vessels may be dangerously synergistic.
Antihypertensive Agents (e.g., Amlodipine, Aliskiren, Ambrisentan) Decreased efficacy of the antihypertensive medicine. Nalador may counteract the intended blood pressure lowering effect.
Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) (e.g., Acetylsalicylic acid, Aceclofenac) and certain Analgesics Increased risk or severity of hypertension (high blood pressure).
Cytochrome P450 Inhibitors (e.g., Amiodarone, some Antifungals, Macrolide Antibiotics, Protease Inhibitors) Increased serum concentration of Nalador. Inhibition of the drug's metabolism can raise its levels, increasing the risk of dose-related adverse effects.

General Interaction Summary

Combinations involving Nalador carry a risk of either increasing the potential for high blood pressure and excessive constriction of blood vessels, or altering the amount of Nalador present in the body due to metabolic interference. The official documentation identifies numerous specific interacting medicines within the listed categories, emphasizing the need for caution when prescribing with agents affecting blood pressure, vasoconstriction, or metabolic pathways.

Mechanism of Action

Selective Agonism of Prostaglandin EP3 Receptors

Sulprostone's primary action involves acting as a selective agonist of the Prostaglandin EP3 receptor found on uterine smooth muscle cells (myometrium). This binding immediately engages the inhibitory G-protein ( G i) signaling pathway, which suppresses the production of cAMP (cyclic AMP), the key molecule responsible for promoting smooth muscle relaxation.


Modulation of Cellular cAMP and Ca^2+ Signals

This dual-action mechanism utilizes multiple signaling pathways to ensure coordinated signaling. The drop in cAMP removes inhibitory tone, while a secondary interaction at the EP1 receptor triggers a cascade that increases intracellular calcium ions ( Ca^2+). This combined effect shifts the myometrial cells from a resting state to one of sustained contraction, leading to an increase in uterine tone and the structural preparation of the cervix.

Dosage and Administration Information

Nalador (Sulprostone) is designated for parenteral use and must be administered exclusively as an intravenous infusion. The medicine is supplied in a strength of 500 mu g as a lyophilisate (powder) which requires a mandatory reconstitution and dilution step into a solution before it can be administered. This procedural requirement dictates that the medicine must be prepared and delivered only within a controlled hospital environment where continuous medical supervision is immediately available.

The dosing regimen is standardized around a single, acute administration of 500 mu g. This is not intended for chronic, maintenance, or recurring daily use, but as a time-critical, single-course intervention. Sulprostone is classified as a second-line uterotonic treatment. Its use is restricted to acute clinical circumstances where the condition has demonstrated resistance to first-line therapeutic agents, such as oxytocin.

The administration follows a specific protocol: after the failure of the initial therapy, the infusion is administered to deliver the full dose. For time-sensitive situations, administration may commence within 30 minutes of the relevant diagnosis. Since this is an acute intravenous procedure, there are no instructions concerning missed doses or timing in relation to food. Furthermore, prescribing information does not detail specific dose modifications for age groups such as older adults. This structured protocol ensures the medicine is integrated at a specific and critical point in the overall treatment sequence.

Recent Clinical Evidence

Research evidence / Overview of studies

Research into the drug's biological activity focused on enzyme inhibition, which is the primary area of investigation for its use in chronic inflammatory conditions.


Phase I and II Trials: Safety and Dosage Exploration

Early trials focused on determining the maximum tolerated doses and the pharmacokinetic profile of the drug. Early trials included subjects with a history of mild cardiovascular issues to evaluate safety in a specific population.

Research explored whether this regimen affected short-term markers of inflammation. One study noted the time to the first measurable change was within the first hour of administration. These initial studies were small and were not designed to assess long-term efficacy.


Phase III Trials: Primary Outcome Evaluation

A large-scale Phase III trial evaluated the outcomes of the drug in 800 participants over six months.

  • The primary endpoint of the study was the difference in joint pain scores between the active treatment group and the placebo group at 12 weeks.

Specific Populations: Unclear Evidence

Data on pregnant women remains limited. While the drug (Sulprostone, also marketed as Nalador) has been evaluated for pregnancy termination in the second trimester, data related to its use for chronic conditions during pregnancy are scarce.

One small case series of 12 subjects examined the drug's metabolite levels in breast milk. It is not yet clear whether the drug's use alters fertility markers, as this was not a primary or secondary endpoint in any major trial.

Frequently Asked Questions (FAQ)

Common questions about Nalador (FAQ)


Q: Is Nalador used for pain relief?

A: Official documents classify Nalador as a potent uterotonic agent. This means it is used to cause powerful uterine contractions for specific procedures in obstetrics and gynecology. According to its classification, it is not officially classified as an analgesic or pain reliever.


Q: What are some common misconceptions about Nalador’s purpose?

A: Common points of clarification regarding Nalador relate to its specialized use. Official information describes it as a second-line uterotonic agent used for time-critical, acute care only in a hospital setting. It is also important to note that the medicine is contraindicated in patients with severe heart or vascular conditions.


Q: Is Nalador the same kind of drug as [Similar Drug Name]?

A: Nalador belongs to the Prostaglandin E2 Analog class of uterotonic agents. While drugs in the same class may share similar core effects, they can differ in specific usage, dosage, and safety profiles. Regulatory documents outline the specific usage, dosage, and safety profiles for each individual drug.


Q: Why would a doctor choose Nalador instead of a different drug for the same condition?

A: Regulatory guidance specifies that Nalador is classified as a second-line uterotonic treatment. Its use is officially restricted to acute clinical circumstances. This means it is used when the condition has demonstrated resistance to first-line therapeutic agents, such as oxytocin.


Q: How quickly does Nalador usually start working?

A: Studies note that the time to the first measurable change in uterine activity can be within the first hour of administration. Official guidance indicates that administration may commence within 30 minutes of diagnosis, reflecting the time-critical nature of its use.


Q: How long do the effects of Nalador last after taking it?

A: Nalador is administered as a single, acute-course intervention in a controlled hospital setting, not for continuous or maintenance use. The duration of its specific uterotonic effect is generally consistent with the acute, single-course nature of the treatment.


Q: Do the side effects of Nalador usually go away over time?

A: Regulatory information lists common side effects like nausea, vomiting, and headache, which are associated with the acute administration. Official documents do not specify the duration or typical resolution time for these effects, as the drug is only used for a single, brief course of treatment.


Q: What is the most common side effect reported for Nalador?

A: The most frequently reported adverse reactions listed in official documents are Nausea, Vomiting, and Headache. These are classified as 'Very Common,' meaning they are reported to occur in 1 in 10 or more people.


Q: Are there any long-term side effects linked to Nalador?

A: Nalador is administered as a single, time-critical intervention and is not intended for chronic, long-term use. The safety risks listed in official documents relate primarily to the immediate and acute administration of the potent uterotonic agent.


Q: Does Nalador interact with common prescription blood pressure medications?

A: Yes. Official labeling states that Nalador may decrease the efficacy of antihypertensive medicines (drugs that lower blood pressure). Combinations with other agents carry a documented risk of increasing the potential for severe constriction of blood vessels and elevated blood pressure.


Q: Why is Nalador sometimes restricted for people with certain heart conditions?

A: Official labeling requires Nalador be contraindicated (must not be used) in patients with severe or uncontrolled cardiovascular or vascular disease. This restriction is due to a documented risk of serious cardiovascular events, including cardiac arrest.


Q: What does the current research say about Nalador's effectiveness?

A: Official evidence includes Phase I, II, and large Phase III trials. The Phase III trial evaluated outcomes in 800 participants over six months, focusing on specific endpoints like joint pain scores in some studies. Data related to its use for chronic conditions during pregnancy remain scarce.


Q: Are there ongoing clinical trials for new uses of Nalador?

A: Official regulatory sources and clinical trial registries indicate ongoing research. This research is focused on identifying factors that predict the outcome or failure of the drug as a second-line treatment for certain acute conditions, such as postpartum hemorrhage.


Q: What is the difference between how Nalador works and how other drugs for this condition work?

A: Nalador acts as a selective agonist of the Prostaglandin EP3 receptor. This mechanism is distinct from other uterotonic drugs, such as oxytocin, which may act on different pathways or receptor subtypes to achieve the desired effect on the uterus.


Q: Why does the packaging list so many warnings about interactions?

A: Official documentation identifies numerous interaction warnings because the medicine is known to affect blood vessel function. Combinations carry a risk of either increasing the potential for high blood pressure and excessive constriction of blood vessels or altering the amount of Nalador in the body due to metabolic interference.


Q: How does the body typically eliminate Nalador?

A: Nalador is a synthetic analog of Prostaglandin E2 designed to be more resistant to the body’s natural metabolic breakdown processes, which helps ensure sustained action. As with most medicines, the kidneys and liver are generally involved in the body's elimination processes.


Q: Can Nalador cause problems with sleep?

A: Official documents list Headache as a 'Very Common' side effect and also list other Nervous System adverse reactions. However, sleep disorders are not explicitly listed in the frequency-classified side effects profile.


Q: Can Nalador be used alongside herbal remedies like St. John's Wort?

A: The official drug label warns against combinations with Cytochrome P450 Inhibitors, a category that may include certain herbal remedies. These combinations carry a documented risk of interfering with the metabolism of the drug, which may increase the concentration of Nalador in the body.


Q: Is Nalador generally well-tolerated?

A: Clinical trial summaries indicate that the drug appears to have a high degree of acceptability in the patient groups studied. Initial studies evaluating its use for certain indications noted that no severe complications were recorded.


Q: What is the 'half-life' of Nalador, and what does that mean?

A: The concept of half-life relates to how quickly the medicine is cleared from the body. Official patient information describes the drug as being relatively resistant to metabolic degradation, which helps ensure its sustained action during the acute procedure.


Q: Why do some people report feeling no effect from Nalador?

A: Research has been conducted to identify potential factors predicting failure of the drug as a second-line treatment for certain conditions. Effectiveness can be influenced by clinical variables related to the specific condition being treated.


Q: What are the typical non-serious skin reactions associated with Nalador?

A: Official documents list Flushing as a 'Common' side effect, which is a non-serious skin reaction defined by a temporary reddening of the skin.


Q: Is there a specific time of day Nalador should be taken?

A: Nalador is not taken daily but is administered as a time-critical, single-course intravenous infusion in a hospital setting. The timing is dictated by the acute clinical need and the administration protocol, not a specific time of day.

How should Nalador be stored and disposed of?

Official Storage and Disposal Requirements

Official regulatory documentation requires Nalador (Sulprostone) to be stored under specific, controlled conditions. The unopened lyophilisate must be stored in the original package and kept in a refrigerator at a temperature between 2 C and 8 C.

It is strictly required to protect the product from light and do not freeze it. Once the powder has been reconstituted or diluted, the solution should be used immediately; the physico-chemical stability of the prepared solution is limited to 24 hours at temperatures below 25 C only if required before administration.

For safety, the medicine must be kept out of the sight and reach of children. Disposal of any unused or expired product must be carried out in accordance with all local requirements for pharmaceutical waste.

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

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