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Окситоцин

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Окситоцин

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Method of action: Hormone

Medically reviewed

Laura Arias

Last updated on 22/12/2025

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

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Overview of Окситоцин

Property Description
Active ingredient Oxytocin (Synthetic Nonapeptide)
Form Sterile Solution for Injection
Pharmacological class Oxytocic Agent (Uterotonic)
General Purpose Management of Uterine Activity
Origin Synthetic

What is Oxytocin and What Type of Hormone is it?

Окситоцин is defined as an oxytocic agent belonging to the class of uterotonics, and its active ingredient is synthetic Oxytocin, a manufactured nonapeptide hormone. This medication is structurally identical to the peptide hormone naturally synthesized in the hypothalamus. Its origin is entirely synthetic, ensuring a standardized and pure compound for medical application. As a single-ingredient product, Окситоцин provides a precise pharmacological tool. Oxytocin is included on the List of Essential Medicines, a designation underscoring its clinically recognized necessity in managing childbirth and postpartum complications globally.


How is Oxytocin Prepared, and What is its General Purpose?

The drug Окситоцин is medically supplied as a sterile Solution for Injection dissolved in an aqueous base, intended exclusively for parenteral administration (by injection or infusion). This form is necessary because peptide hormones are quickly destroyed by stomach enzymes, rendering them ineffective if taken orally. The general purpose of the drug is the clinical management of uterine activity, achieved by stimulating the smooth muscle cells of the uterus (uterine contractions). In this clinical application, oxytocin promotes rhythmic contractions in the uterus. This pharmacological action supports its use to encourage the uterus to contract. This primary action helps to either initiate or reinforce labor when contractions are insufficient, and to ensure the uterus effectively contracts after delivery, which is essential for naturally controlling and reducing postpartum bleeding. It also assists in stimulating the milk ejection reflex in breastfeeding mothers.

Regulatory References

  1. WHO Essential Medicines List
  2. U.S. National Library of Medicine
  3. NIH: MedlinePlus
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What side effects are possible with Окситоцин?

Possible Side Effects and Safety Information

The safety profile of Oxytocin is formally structured by regulatory authorities to define adverse reactions across various system-organ classes, distinguishing between common and serious outcomes.

Adverse reactions are classified based on frequency as documented in official prescribing information:

  • Common (1% to 10%): Maternal effects such as headache, nausea, vomiting, tachycardia, and bradycardia are officially listed.
  • Rare or Very Rare: These include anaphylactoid reactions and severe water intoxication associated with maternal and neonatal hyponatraemia.
  • Not Known: This classification applies to serious reactions like uterine rupture, acute pulmonary oedema, Disseminated Intravascular Coagulation (DIC), and Myocardial ischaemia, where frequency cannot be reliably estimated from available data.

The regulatory documents highlight several Serious Adverse Reactions. These include life-threatening maternal risks such as anaphylactic shock, fatal afibrinogenemia, rupture of the uterus, and subarachnoid hemorrhage. For the fetus and neonate, documented serious risks include permanent Central Nervous System (CNS) or brain damage and fetal death.

Population-Specific and Exposure-Related Safety Notes are included in official labeling. The label advises caution for patients with severe renal impairment due to the potential for water retention. Risks of uterine hypertonicity and rupture are associated with excessive dosage. Furthermore, severe water intoxication is specifically linked to a slow infusion over a prolonged period in combination with large volumes of fluid, a pattern detailed in regulatory safety documents.

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Overdose and Emergency Response

Overdose and When to Seek Help

Overdose with Oxytocin is defined in regulatory documents as a condition resulting from excessively high infusion rates or total doses, particularly in the obstetric setting. This scenario is classified as capable of causing severe and life-threatening outcomes.

Documented Overdose Manifestations

The primary danger is uterine hyperstimulation, characterized by sustained, abnormally strong, or frequent contractions (tetanic contractions). This complication is documented to result in severe consequences, including uterine rupture and fetal distress that can escalate to fetal death.

Systemic manifestations are also officially described. Due to the drug’s antidiuretic effect at high concentrations, overdose can lead to water intoxication and critical hyponatremia, which may cause severe neurological outcomes such as convulsions and coma.

Required Emergency Action

Official regulatory guidance requires that any suspected overdose or sign of uterine hyperstimulation necessitates the immediate cessation of the Oxytocin infusion. Because no specific antidote is known, management focuses on symptomatic and supportive treatment.

Immediate medical care must be sought for any patient experiencing these severe manifestations. Monitoring of fluid and electrolytes, as well as continuous observation of the fetal heart rate and uterine activity, is required following the emergency action.

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Therapeutic Uses of Окситоцин

Quick Facts: Oxytocin

  • Labor Induction: Utilized to initiate or improve uterine contractions when medically indicated.
  • Augmentation of Labor: May be used to reinforce labor in select cases of reduced uterine activity.
  • Postpartum Bleeding: Employed to produce uterine contractions after delivery to assist in controlling hemorrhage.
  • Abortion Management: Used as adjunctive therapy in the management of incomplete or inevitable abortion.

What Oxytocin Treats: Main Uses and Benefits

Oxytocin is a prescribed medication used in obstetrics under the direction of a healthcare professional. Its principal therapeutic application is in the management of labor and delivery. The medication is indicated for the initiation or improvement of uterine contractions when a medical reason for labor induction is present, such as pre-eclampsia or maternal diabetes at or near term, or when the membranes have prematurely ruptured and delivery is considered suitable. The use of oxytocin in this context is intended to help achieve vaginal delivery when a fetus or mother may be at risk.

Oxytocin may also be administered to stimulate or reinforce labor in certain situations characterized by inadequate uterine activity. After delivery, the medication is routinely utilized to promote uterine contractions during the third stage of labor and to help control postpartum bleeding or hemorrhage. Additionally, Oxytocin may serve as an adjunctive therapy in the management of incomplete or inevitable abortion, particularly during the second trimester.

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Eligibility and Restrictions for Use

Who Can and Cannot Use Окситоцин?

Eligibility for Окситоцин (Oxytocin) is strictly defined by regulatory documents and is confined to adult females for approved obstetric purposes. Its use is not indicated for pediatric or geriatric populations.


Contraindications and Restrictions

Contraindicated populations are those who must not use the medicine under any circumstances. These include patients with a known hypersensitivity to the drug, significant cephalopelvic disproportion, unfavorable fetal positions (e.g., transverse lie), and cases where vaginal delivery is contraindicated (e.g., total placenta previa or vasa previa) .

Restricted or Conditional Use is required for populations with specific risk factors. The drug should be avoided except in unusual circumstances in women with grand multiparity (five or more previous deliveries) or a history of major uterine or cervical surgery. Caution is specifically advised for patients with pre-existing cardiovascular disease or severe renal impairment due to the potential for complications or drug accumulation.


Pregnancy and Lactation Status

Окситоцин is permitted for its established indications during pregnancy (labor/postpartum) and lactation, as it is a crucial component of the milk ejection reflex and is not expected to be harmful to a nursing infant.

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What should I know about interactions with other medicines?

Interactions with other medicines and products

This section describes documented interaction patterns for Oxytocin as found in official regulatory documents from authorities like the FDA and EMA. The information focuses strictly on high-level interaction outcomes and requirements, without providing clinical advice or therapeutic recommendations.

Interaction Category Documented Interaction Pattern
Vasoconstrictor Agents Co-administration has been associated with reports of severe hypertension when used following caudal block anesthesia. A mandatory time separation of three to four hours is noted to be relevant to this risk.
Anesthetic Agents Cyclopropane anesthesia may modify Oxytocin’s cardiovascular effects, resulting in outcomes such as hypotension and maternal sinus bradycardia with abnormal atrioventricular rhythms.
Uterotonics Combining Oxytocin with other prostaglandins or uterotonics may lead to a pharmacodynamic additive effect, increasing the risk of uterine hypertonicity or rupture.
Neuromuscular Blockers The medicine has been documented to enhance the neuromuscular blockade caused by agents such as succinylcholine.

The official interaction profile for Oxytocin is structured primarily by pharmacodynamic interactions that influence both uterine activity and systemic cardiovascular function. These documented effects establish specific constraints on co-administration with other uterotonics and certain anesthetic agents. Additionally, the regulatory label advises caution when administered to patients with a known ‘long QT syndrome’ who are concurrently taking other QTc-prolonging drugs. The official documents do not list interactions based on pharmacokinetic mechanisms like CYP enzyme or drug transporter inhibition.

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Mechanism of Action

Окситоцин (Oxytocin) functions as a peptide hormone agonist primarily targeting the Oxytocin Receptor (OTR), a Gq/ G11-protein coupled receptor. The highest density of these receptors is located on myometrial smooth muscle cells of the uterus, and on myoepithelial cells surrounding the alveoli and ducts of the mammary gland.

Binding of Окситоцин to the OTR initiates a molecular cascade. Receptor activation leads to the dissociation of the G-protein alpha-subunit, which subsequently activates Phospholipase C ( PLC). PLC hydrolyzes Phosphatidylinositol 4,5-bisphosphate ( PIP2) into Inositol Trisphosphate ( IP3) and Diacylglycerol ( DAG). IP3 diffuses to the endoplasmic and sarcoplasmic reticula, triggering the release of stored intracellular Ca^2+. Concurrently, DAG activates Protein Kinase C ( PKC), which promotes additional Ca^2+ entry through voltage-gated channels.

The resulting sustained increase in intracellular Ca^2+ concentration stimulates the Ca^2+-dependent enzyme Myosin Light Chain Kinase ( MLCK). MLCK phosphorylates the Myosin Light Chain ( MLC), which in turn engages with actin filaments. This molecular engagement drives the system-level physiological consequence of smooth muscle contraction in targeted tissues.

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Dosage and Administration Information

How to Use Окситоцин - Official Administration Guidelines

Окситоцин is administered exclusively by parenteral routes (injection or infusion) and is restricted to use within a specialized hospital setting. The specific route and dosing regimen depend strictly on the purpose of administration, as defined by standard prescribing information.


Administration and Dosage Patterns

Indication Administration Route Standard Labeled Regimen Delivery Constraint
Labor Induction/Augmentation Intravenous (IV) Infusion Initial rate of 0.5 to 1 mUnit/min Requires electronic infusion pump for controlled, gradual titration
Postpartum Hemorrhage Intramuscular (IM) Injection or IV Infusion 10 Units IM (single dose after placental delivery) OR 10 to 40 Units diluted in 1,000 mL IV fluid IM administration is for immediate post-delivery use; IV requires adjustment to maintain uterine tone

Preparation and Schedule

For IV Infusion, the concentrated solution must be aseptically diluted into an appropriate IV fluid, such as 0.9% Sodium Chloride or Lactated Ringer's Solution, before administration. The dosage is not static but requires titration: the infusion rate for labor is gradually increased by 1 to 2 mUnit/min at controlled intervals, typically every 30 to 60 minutes, to achieve the desired response. This titration pattern ensures the dosing is highly individualized and controlled.

No specific dose adjustments are formally provided in standard labeling for older adults or patients with renal or hepatic impairment. Administration is typically a short-term, continuous process maintained until the clinical objective is met, such as delivery or cessation of hemorrhage.

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Recent Clinical Evidence

Research evidence / Overview of Studies for Oxytocin (Окситоцин)

The research foundation for Oxytocin relies primarily on Randomized Controlled Trials (RCTs) and systematic reviews that combine the data from multiple trials. These studies were conducted to understand how the medicine was studied in the context of inducing or stimulating uterine contractions during childbirth and immediately afterward. Findings describe group patterns, not personal outcomes, and evidence highlights what is known—and what is still uncertain.


Evidence for Use in Labor Induction

Clinical research, mainly using RCTs, has been applied in studies examining the initiation of labor when a medical need exists, such as in cases of certain maternal conditions. These studies was evaluated in pregnant women near or at term. Researchers explored outcomes related to labor duration, the proportion of women who achieved a vaginal delivery, and the recorded rate of Caesarean section. Findings describe patterns observed in the studies, where Oxytocin use was associated with measurements indicating a shorter time interval from the start of induction to delivery. Research is ongoing concerning the various dosage and infusion protocols studied to balance measured uterine activity outcomes with the incidence of uterine hyperstimulation.


Evidence for Preventing and Managing Postpartum Bleeding

This is one of the most widely studied uses of Oxytocin, with a large volume of high-quality RCTs exploring its application immediately following delivery. The medicine was studied for its role in preventing Postpartum Hemorrhage (PPH). Systematic reviews and trials documented that the routine administration of Oxytocin was observed alongside lower recorded measurements of blood loss and PPH compared to control groups. However, comparative trials reported various findings when Oxytocin was compared to other active uterotonic agents; the research documents varying findings across all measured outcomes when comparing Oxytocin to other agents.


What is Still Uncertain About Oxytocin Research

Despite extensive clinical study, some research gaps and areas of uncertainty remain. The main body of research focuses on short-term outcomes observed during the labor and immediate postpartum periods. Follow-up durations were limited across many trials, meaning the full picture of long-term effects on maternal or child health is not fully established. Additionally, data for certain groups remain insufficient, such as women with specific severe medical conditions.

Key Studies & References

  1. WHO recommendations: Uterotonics for the prevention of postpartum haemorrhage (2018)
  2. Appropriate Storage and Management of Oxytocin - a Key Commodity for Maternal Health (WHO/UNICEF/UNFPA Joint Statement)
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Frequently Asked Questions (FAQ)

Common questions about Окситоцин (FAQ)


Q: Is Окситоцин used for anything other than childbirth?

According to official documents, in addition to labor induction and managing bleeding after delivery, Окситоцин is also approved for use in certain cases of miscarriage. It is also indicated to assist with the milk ejection reflex (milk let-down) for breastfeeding mothers. The official product information indicates established uses beyond the immediate process of delivery.


Q: What is the main difference between Окситоцин and pitocin?

Окситоцин is the name of the active pharmaceutical ingredient, which is synthetic oxytocin. Pitocin and Syntocinon are both brand names used commercially to market this same medication. Therefore, these products contain the exact same pharmaceutical compound.


Q: How quickly does Окситоцин start working when administered?

The speed of onset depends on the method of administration. Following rapid intravenous (IV) injection for postpartum bleeding, the effect can begin in less than one minute. For controlled labor induction using a continuous IV infusion, the clinical response is gradual, often taking 20 to 40 minutes to reach a stable effect.


Q: How long does the effect of Окситоцин usually last in the body?

Oxytocin has a very short half-life of only three to five minutes in the bloodstream. The short half-life suggests the compound is broken down and cleared rapidly. The clinical effects on the uterus typically last for about 30 to 60 minutes after a rapid injection, and they quickly subside once a continuous infusion is stopped.


Q: Is Окситоцин considered a high-risk medication?

While the regulatory label does not use the specific term 'high-risk,' the drug is commonly classified by patient safety organizations as a High-Alert Medication. This classification highlights the significant potential for harm if the medication is not administered under strictly controlled conditions.


Q: Are there any limitations on who can use Окситоцин based on age or weight?

Official guidelines state that the drug is not indicated for use in pediatric or elderly populations. Caution is advised for women over 35 or those who have had five or more previous deliveries. Regulatory documents do not provide specific dose adjustments or limitations based on a patient's weight.


Q: Can men ever receive Окситоцин for a medical reason?

The approved therapeutic indications for this medicine are explicitly confined to adult females for specific obstetric purposes, such as assisting labor or managing postpartum conditions. Its medical use is not an approved indication for men.


Q: Is there scientific research on the use of Окситоцин for non-obstetrical conditions?

The primary basis for regulatory approval is the drug's use in obstetrical management, such as labor and postpartum care. While the compound is widely studied in other non-obstetrical areas, these are considered subjects of ongoing research and are not approved indications for the drug.


Q: What does the evidence say about using Окситоцин to promote milk let-down?

Official product information confirms that the drug is indicated and has established efficacy to assist with the milk ejection reflex. It is used to help stimulate the natural process of milk let-down for breastfeeding mothers.


Q: Is Окситоцин a pain reliever?

No. Окситоцин is classified as an oxytocic agent (uterotonic), meaning its primary pharmacological purpose is to stimulate the smooth muscle cells of the uterus to cause contractions. Official classification does not list it as an analgesic (pain reliever).


Q: Is there any risk if I have high blood pressure and receive Окситоцин?

Official prescribing information advises caution when the medicine is given to patients with a history of mild to moderate high blood pressure, particularly pregnancy-related hypertension. The drug can cause acute changes in blood pressure, and combining it with certain other medicines is associated with reports of severe hypertension.


Q: Can I receive Окситоцин if I have a history of a C-section?

A history of a Caesarean section (C-section) or other major uterine surgery is listed as a factor requiring caution or restricted use. This warning is based on the potential for the uterine stimulation caused by the drug to increase the risk of uterine rupture in women with prior surgical incisions on the uterus.


Q: Is Окситоцин used in veterinary medicine, and is it the same product?

Yes, a version of Oxytocin is approved for use in veterinary medicine for several species, including cattle, dogs, and cats. It is used to assist with labor or milk letdown in animals. The veterinary product is restricted to use by or on the order of a licensed veterinarian.


Q: What are the expectations regarding the intensity of contractions when Окситоцин is used?

When administered for labor, the dosage is carefully increased (titrated) until the contractions are similar in pattern and intensity to what is achieved during natural, spontaneous labor. The goal is to establish a medically controlled contraction pattern that is considered normal.


Q: Is it common for patients to feel dizzy after Окситоцин administration?

Official prescribing information does not list dizziness among the common maternal side effects, which typically include headache, nausea, and vomiting. However, rapid intravenous injection can sometimes cause a temporary drop in blood pressure (hypotension), which may be felt as lightheadedness.


Q: Does Окситоцин contain any sulfa or gluten ingredients?

The formulation's inactive ingredients (excipients) typically consist of sodium acetate, acetic acid, and water for injections. Regulatory documents do not list sulfa derivatives or gluten-containing compounds in the solution for injection.


Q: Is Окситоцин considered a hormone replacement therapy?

Although the active ingredient is a synthetic version of a naturally occurring peptide hormone, the drug is officially classified as an Oxytocic Agent (Uterotonic). Its approved use is for short-term, functional stimulation of the uterus, and it is not classified as a hormone replacement therapy.


Q: What is the official classification of Окситоцин (e.g., Schedule 4 drug)?

The drug is not classified as a federally controlled substance in the United States. It is designated as a Prescription-only medication, meaning it requires authorization from a licensed healthcare provider.


Q: Is there a maximum time frame for how long Окситоцин can be administered?

For labor, the administration continues only until the clinical objective is met. Official warnings highlight that administering the drug through a slow infusion over a prolonged period with large volumes of fluid can carry a specific risk of severe water intoxication.


Q: Why is it important to check the fetal heart rate when Окситоцин is used for labor?

Careful monitoring of the fetal heart rate is required because an overly high dose or high sensitivity to the drug can lead to uterine overstimulation (hypertonicity). Overstimulation can compromise blood flow to the placenta, which may cause fetal distress and other serious fetal complications.


Q: What does the patient information leaflet typically say about stopping treatment?

The treatment is an acute, continuous process maintained until the clinical objective is achieved. The official product information states that the infusion may be discontinued immediately or reduced if signs of uterine overstimulation or fetal distress occur.


Q: How long does it take for Окситоцин to be cleared from the body?

The medicine is very quickly cleared from the body. Official product information indicates that the drug has a high clearance rate from the bloodstream, primarily through the kidneys and liver (renal and hepatic mechanisms).


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How should Окситоцин be stored and disposed of?

How to Store and Dispose of Oxytocin Injection

The storage of Oxytocin Injection is strictly regulated to maintain the stability and potency of the solution.

Required Storage Conditions

  • Temperature: The product must be stored in a refrigerator, between 2 C and 8 C, although some labeling may permit storage below 25 C in specific regions.
  • Protection: The injection must be protected from light and it is required that the solution must not be frozen.
  • Single-Dose Use: For single-dose vials, the unused portion must be discarded after the initial use to ensure sterility.
  • Child Safety: The medication should be kept out of the sight and reach of children.

Disposal Instructions

Disposal of both the unused contents and the container must be carried out in accordance with local, regional, and national regulations for pharmaceutical waste. When cleaning up spills or releases, it is required to avoid release to the environment, and any contaminated materials must be retained for proper disposal.

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

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