Traktocil

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Traktocil

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Method of action: Other Gynecologicals

Treatment option:

Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Traktocil

Property Description
Active ingredient Atosiban (as atosiban acetate)
Form Solution for injection and concentrate for solution for infusion
Pharmacological class Oxytocin antagonist
Common use Delaying imminent pre-term birth
Origin Synthetic peptide analogue

What Type of Medicine is Traktocil?

Traktocil is a highly specific single-ingredient product utilized in obstetrical care, with its active substance being atosiban, administered as atosiban acetate. It is classified as an oxytocin antagonist and is utilized therapeutically as a tocolytic agent. The drug's structure as a synthetic peptide analogue is a key differentiating factor, marking it as a modern agent in its class. This unique chemical design allows atosiban to achieve a highly selective effect, which is clinically recognized for its targeted intervention in labor.

Composition and Route of Administration

Atosiban is supplied as a sterile aqueous solution, specifically a solution for injection and a concentrate for solution for infusion. This preparation confirms its status as a prescription-only medicine intended for controlled use in hospital settings. The composition involves atosiban acetate dissolved in a base suitable for direct infusion into the bloodstream. This pharmaceutical form dictates that the route of administration is strictly intravenous, which is a standard clinical procedure.

What is the General Purpose of a Tocolytic Agent?

The general purpose of an oxytocin antagonist is to cause immediate uterine muscle relaxation and induce the suppression of uterine motility. By inhibiting the regular and intense uterine contractions, the medication fulfills its core role as a tocolytic agent. The typical use scenario involves stabilizing a pregnant adult woman experiencing imminent pre-term labor, with the goal of delaying pre-term birth to allow for necessary preparatory medical actions.

Regulatory References

  1. European Public Assessment Report (EPAR) for Tractocile

What side effects are possible with Traktocil?

The safety profile of Traktocil (atosiban) is structured by official regulatory documents, classifying potential adverse reactions by frequency and the body system affected. These classifications reflect observations primarily from controlled clinical studies.

Frequency-Classified Adverse Reactions

The most frequently reported effects fall into the Very Common and Common categories. Nausea is classified as the single Very Common adverse reaction (occurring in 1 in 10 patients or more). Common effects (1 to 10 in 100 patients) include headache, dizziness, vomiting, hypotension (low blood pressure), tachycardia (fast heartbeat), hot flushes, and reactions at the injection site. Most documented adverse effects are typically observed during the initial bolus administration phase of the treatment.

System-Organ-Class Groupings and Serious Reactions

Adverse reactions are formally grouped into systems, primarily involving the Gastrointestinal and Cardiovascular systems. Rarer reactions (Rare, 1 to 10 in 10,000 patients) include allergic reaction, uterine haemorrhage, and uterine atony (lack of uterine muscle tone after delivery).

Serious Adverse Reactions reported post-marketing include pulmonary oedema (lung swelling) and other respiratory events, particularly when the medicine is administered concurrently with other tocolytic agents, such as calcium channel blockers or beta-mimetics, or in cases of multiple pregnancy. Given the mechanism as an oxytocin antagonist, blood loss after delivery requires monitoring.

Population and Safety Considerations

Regulatory safety information notes that safety and efficacy have not been established in pregnant women under 18 years of age. Furthermore, there is no clinical experience in patients with established hepatic or renal impairment, necessitating caution when the medicine is used in these populations.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory documents provide a precise profile regarding overdose scenarios involving Traktocil (atosiban). A defining characteristic is the low incidence reported in clinical experience: only few cases of overdosing have been documented in regulatory literature. Crucially, these reported cases occurred without the manifestation of any specific signs or symptoms. This indicates that an overdose is not consistently associated with a clear, distinguishing pattern of clinical presentation or severe, life-threatening outcomes, according to regulatory data.

Traktocil is administered solely by healthcare professionals via intravenous infusion within a highly controlled hospital environment. Any suspicion of an overdose situation is automatically under the immediate purview of the administering medical team, satisfying the required condition for seeking urgent medical help through continuous hospital oversight.

Overdose Management

The official prescribing information explicitly states that there is no known specific treatment or antidote available for an overdose of atosiban. In the event of an exposure, the regulatory basis for clinical response dictates that management is limited to the immediate discontinuation of the infusion. Subsequent care is restricted to the implementation of appropriate symptomatic and supportive measures, as there are no specific procedural steps or observation requirements beyond standard hospital protocols documented for overdose management.

Therapeutic Uses of Traktocil

What Traktocil Treats: Main Uses and Benefits

Traktocil is generally used for acute intervention when a patient is experiencing symptoms related to threatened pre-term labor, applicable to pregnant adult women between 24 and 33 completed weeks of gestation. The medication is indicated for use in conditions characterized by periods of heightened symptoms. Its primary action involves the suppression of active uterine contractility and other progressive labor signs. This targeted control is applied in clinical settings that involve acute or unstable symptom patterns.

The primary therapeutic purpose of the medication is to support the delay of pre-term birth, which may assist with gestation prolongation. This time may assist medical teams in conducting preparatory measures that support general well-being ahead of delivery. The medicine provides supportive relief when symptoms interfere with routine activities, contributing to improved comfort during a period of heightened physiological activity.

“This intervention provides a crucial time-sensitive window to optimize conditions for specialized maternal and neonatal care.”

Traktocil is commonly used for managing symptoms during acute episodes associated with threatened pre-term delivery.


Quick Fact: Relief for Active Uterine Contractility

Eligibility and Restrictions for Use

Traktocil (atosiban) is specifically indicated for the delay of imminent pre-term birth in adult pregnant women. It is used in patients meeting specific criteria, including: regular uterine contractions, a cervical dilation between 1 and 3 cm, and a gestational age from 24 to 33 completed weeks. The fetus must also exhibit a normal heart rate.


Contraindications (Who cannot use Traktocil?)

Traktocil is contraindicated when the continuation of pregnancy is deemed unsafe or when specific conditions are present. This includes:

  • Gestational age less than 24 weeks or greater than 33 completed weeks.
  • Pre-existing conditions such as placental abruption, placenta previa (where the placenta covers the birth canal), or any other condition that necessitates immediate delivery.
  • Severe pregnancy complications like eclampsia (fits/convulsions) or severe pre-eclampsia (very high blood pressure and protein in the urine) requiring immediate intervention.
  • Intrauterine infection or premature rupture of membranes after 30 weeks of gestation.
  • Fetal distress (an abnormal fetal heart rate) or confirmed stillbirth.
  • Known hypersensitivity or allergy to the active substance, atosiban, or any of the inactive ingredients.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information for atosiban (Traktocil) documents specific interaction patterns concerning pharmacodynamics and pharmacokinetics, as detailed in the Summary of Product Characteristics (SmPC).

Pharmacodynamic and Safety-Related Interactions

Interaction Type Interacting Substance/Class Official Documented Outcome
Pharmacodynamic Reinforcement Other tocolytic agents (e.g., beta-mimetics, calcium antagonists) Concomitant use is associated with an increased risk of respiratory events, requiring caution, especially in cases of multiple pregnancy.
Pharmacodynamic Antagonism Oxytocin (released during breastfeeding) May augment uterine contractility and potentially counteract the tocolytic effect; breastfeeding is generally discontinued during treatment.

Pharmacokinetic and Exposure Interactions

Official documentation states that atosiban is unlikely to be involved in drug-drug interactions mediated by the Cytochrome P450 (CYP450) system, as in vitro data confirms it is neither a substrate nor an inhibitor of these major enzymes.

Interaction studies with certain medications were conducted to assess exposure changes:

  • Co-administration with labetalol resulted in a reduction in labetalol’s maximum plasma concentration (C max) but the overall exposure (AUC) was unchanged, and the interaction was determined to be not clinically relevant.
  • Co-administration with betamethasone showed no clinically relevant interaction.

Other Interaction Considerations

The medicine must be used with caution in the population with impaired hepatic function. No specific interactions are documented in regulatory sources regarding food, alcohol, supplements, or herbal products.

Mechanism of Action

Traktocil (Atosiban) functions as a selective competitive antagonist at the Oxytocin Receptor (OTR), primarily located on myometrial smooth muscle cells. This mechanism utilizes a synthetic peptide analogue that occupies the OTR binding site, impeding the endogenous hormone, oxytocin, from binding and initiating the contractile sequence.

Blockade of the OTR directly arrests the downstream G-protein coupled signaling pathway, which is coupled to the release of free calcium ions ( Ca^2+) from the sarcoplasmic reticulum. The resulting low intracellular Ca^2+ concentration limits the activation of the final contractile machinery. The suppressed calcium signal prevents the binding of Ca^2+ to calmodulin, leading to the inactivation of the enzyme Myosin Light-Chain Kinase (MLCK).

This action halts the necessary phosphorylation of the myosin light chain, physically decoupling the actin and myosin filaments. The consequence is immediate myometrial smooth muscle relaxation and inhibition of spontaneous contraction, defining the drug's core physiological action.

Dosage and Administration Information

Traktocil (atosiban) is administered strictly in a controlled setting and must be initiated and maintained by a physician experienced in the treatment of pre-term labour. The medication is administered intravenously through a structured, three-stage dosing protocol, which begins as soon as possible after the diagnosis of the condition.

Official Three-Stage Dosing Regimen

The total treatment duration is limited to 48 hours, and the administration follows a precise sequence of doses.

Stage Dose / Rate Duration
1. Initial Bolus 6.75 mg (in 0.9 ml of solution) Administered over 1 minute
2. Loading Infusion 18 mg/ hour (300 mu g/ min) 3 hours
3. Maintenance Infusion 6 mg/ hour (100 mu g/ min) Up to 45 hours

Preparation and Procedural Rules

For the continuous infusion stages, the concentrate for solution for infusion (37.5 mg/5 ml vial) must be diluted with suitable intravenous fluids such as 0.9% Sodium Chloride or 5% Glucose solution. The total dose given during a single full course of therapy should preferably not exceed 330.75 mg of atosiban.

In the event that uterine contractions recur, re-treatment can be initiated. Re-treatment must also begin with the initial 6.75 mg intravenous bolus, followed by the continuous infusion as outlined above. Clinical experience with multiple re-treatments is limited, with recommendations often restricted to a total of three re-treatments. Use is restricted to pregnant adult women (aged 18 years of age).

Recent Clinical Evidence

Research evidence / Overview of Studies for Traktocil

Evidence for Use in Threatened Pre-term Labor

The main body of research for Traktocil was studied for women experiencing conditions characterized by periods of heightened symptoms related to threatened pre-term labor. This research was evaluated in women typically between the 24th and 33rd completed weeks of gestation. The evidence landscape includes Randomized Controlled Trials (RCTs), which compare Traktocil to other treatments or a placebo, and systematic reviews that combine these findings.

Researchers primarily focused on the short-term goal of gestation prolongation. They monitored the time interval from treatment start to delivery, specifically recording the proportion of participants who remained undelivered at 48 hours and seven days. Findings indicate that research examined measurements of the time interval from treatment start to delivery. This research contributes to the broader evidence landscape by examining the association between the agent and the short-term physiological changes required for gestation prolongation.

Comparative Study Findings

Studies also explored how Traktocil was studied for its profile when compared directly to older and newer agents. Research explored the measured tolerability of this medicine, including the reporting of systemic strain and physical discomfort compared to other agents was studied for in the trials. The evidence highlights that the pattern of measured outcomes was observed in some studies to be similar across the evaluated agents.

Neonatal and Long-Term Follow-up Studies

Beyond the immediate effect of delivery delay, research examined the ultimate goal of exploring outcomes for the newborn. Studies monitored composite neonatal outcomes, which are endpoints combining severe neonatal morbidities and mortality. Findings from newer, controlled trials indicate that the research explored whether the delay in delivery would influence composite neonatal health measures. Uncertainty remains low regarding the definitive influence of tocolysis on the long-term health of the child.

Key Areas of Scientific Uncertainty

The short-term goal of delaying delivery was evaluated in many studies. However, certainty remains low concerning the overall impact on severe neonatal morbidity and mortality when research compared the medicine to control groups. Further research is being conducted to clarify the evidence landscape for this medicine and to address specific research limitation frames, such as the lack of large-scale, long-term follow-up data for all treatment scenarios.

Frequently Asked Questions (FAQ)

Common questions about Traktocil (FAQ)

Q: What is the main difference between Traktocil and similar, older medications?

Studies examined how Traktocil compares to older agents used for delaying pre-term birth. Official information indicates that Traktocil's structure as a synthetic peptide analogue allows for highly selective action on the oxytocin receptor. Evidence indicates that, when compared to older agents like beta-mimetics, research explored a different pattern of reported cardiovascular effects.

Q: How quickly do people typically expect to notice the first effects of Traktocil?

Traktocil is designed to work very rapidly to suppress uterine contractions. According to the official product information, the therapeutic effect is typically observed within approximately 10 minutes of receiving the initial dose, which is administered as a quick bolus injection.

Q: Is there any evidence for Traktocil from real-world data or post-marketing surveillance?

Yes, the medicine is continuously monitored after it becomes available to the public through a process called post-marketing surveillance. This real-world safety tracking is crucial for identifying any rare or serious adverse reactions that were not observed during the initial clinical trials. This ongoing official monitoring contributes to the comprehensive understanding of Traktocil's safety profile in general clinical practice.

Q: Is Traktocil a brand name or a generic medicine, or is a generic version available?

Traktocil is the brand name used for the active substance, which is atosiban. Regulatory documents confirm that the active substance, atosiban, is now available in both the original brand-name product and in generic forms.

Q: Why is Traktocil sometimes described as a 'targeted therapy'?

Traktocil is often referred to as a targeted therapy because of its precise mechanism of action. Official documents describe it as a selective competitive antagonist that works by blocking only the Oxytocin Receptor in the uterus. This highly specific action directly targets the signals that cause uterine contractions, leading to muscle relaxation.

Q: How long does Traktocil generally remain in the body after the last dose?

Traktocil has a very short effective half-life, which is a measure of how quickly a substance is eliminated from the body. Official pharmacokinetic data indicates that the half-life is approximately 18 minutes. This rapid clearance means that the pharmacological effects of the medicine are quickly diminished, typically within one to two hours after the continuous infusion is stopped.

Q: How is an 'adverse reaction' to Traktocil defined in patient information sheets?

An adverse reaction is formally defined as an unwanted or unexpected effect that occurs during the use of a medicine. Official patient information notes that adverse effects are typically observed during the initial administration phase, and the majority of documented reactions are classified by official sources as common or very common.

Q: What are the general statements made about Traktocil and risk of dependence?

Official documents on abuse and dependence state that Traktocil has been assessed based on clinical data. Clinical data indicates that the medicine is not reported to have habit-forming tendencies and is not associated with abuse potential.

Q: Can Traktocil cause drowsiness or affect sleep patterns?

Official safety documents list difficulty in falling asleep (insomnia) as a reported adverse reaction. Drowsiness or excessive sleepiness are generally not listed as common side effects in patient resources.

Q: Does Traktocil affect a person's ability to drive or operate machinery?

Because common adverse reactions include dizziness and hypotension (low blood pressure), the official product information indicates that activities requiring full alertness, such as driving or operating heavy machinery, should be avoided until any temporary effects subside.

Q: Are there any known physical or psychological withdrawal effects listed for Traktocil?

Due to Traktocil's rapid clearance from the body and lack of reported dependence potential, regulatory documents do not list any known physical or psychological withdrawal effects. The pharmacological profile of the medicine is not associated with a withdrawal syndrome upon discontinuation.

Q: Are the research findings for Traktocil typically published in peer-reviewed medical journals?

Yes. Official regulatory bodies evaluate the findings from controlled clinical trials that are typically published in recognized, peer-reviewed medical journals. This publicly accessible research forms the basis of the official regulatory summaries.

Q: What are the key ingredients in Traktocil besides the active compound?

The active substance is atosiban acetate. The concentrate for solution also contains several inactive ingredients, or excipients. These typically include water for injection, mannitol, and acetic acid, which are necessary to ensure the solution is stable and suitable for safe intravenous administration.

How should Traktocil be stored and disposed of?

How to Store and Dispose of Traktocil

Traktocil (atosiban) must be handled and stored according to specific cold-chain and stability requirements defined by regulatory labeling.


Storage Requirements

  • Unopened Product: Vials must be stored in a refrigerator at 2 C to 8 C (36 F to 46 F). The medicine must be kept in the original package to protect from light.
  • Prepared Solutions: The solution for injection (bolus dose) must be used immediately once the container is opened. The diluted solution for continuous infusion has a stability window of 24 hours at 25 C.
  • Child Safety: This medicine must be kept out of the sight and reach of children.

Disposal Instructions

Unused or expired Traktocil and waste materials must be disposed of in accordance with local regulatory requirements for pharmaceutical waste. The product should not be disposed of in wastewater or household waste.

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

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