Клостилбегит

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Клостилбегит

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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 Клостилбегит

What is Клостилбегит?

Клостилбегит is a non-steroidal medication used in reproductive medicine to stimulate ovulation. Its active ingredient, clomifene citrate, belongs to a class of drugs known as selective estrogen receptor modulators (SERMs). It is primarily used to treat female infertility caused by anovulation, a condition where the ovaries do not regularly release an egg.

Mechanism of Action

The medication works by interacting with estrogen receptors in the brain, specifically in the hypothalamus and the pituitary gland. By binding to these receptors, it blocks the normal negative feedback of estrogen. This leads the body to perceive a deficiency in estrogen levels, prompting the pituitary gland to increase the production and release of two essential gonadotropins:

  • Follicle-Stimulating Hormone (FSH): Stimulates the growth and maturation of ovarian follicles.
  • Luteinizing Hormone (LH): Triggers the release of a mature egg from the follicle (ovulation).

Indications for Use

Клостилбегит is indicated for women who are seeking to become pregnant but face challenges due to irregular or absent ovulation. Common conditions for which this medication is utilized include:

  • Polycystic Ovary Syndrome (PCOS): A hormonal disorder frequently associated with anovulatory infertility.
  • Secondary Amenorrhea: The absence of menstrual periods due to hormonal imbalances.
  • Galactorrhea: When associated with ovulatory dysfunction.

In certain clinical contexts, the medication may also be used in controlled ovarian stimulation protocols as part of assisted reproductive technologies.

Regulatory References

  1. Clomiphene: MedlinePlus Drug Information

What side effects are possible with Клостилбегит?

Possible side effects and safety information

Clomifene citrate, the active component of Клостилбегит, has an official safety profile structured by frequency and system-organ class, as documented by regulatory authorities.

Frequency Category Common Side Effects (Examples)
Very Common (>10%) Ovarian enlargement, Vasomotor flushes (Hot flashes)
Common (1% to 10%) Abdominal-Pelvic Discomfort/Bloating, Nausea, Headache, Visual symptoms (e.g., blurred vision)

The most frequently reported adverse reactions affect the Reproductive System and the Vascular System.


Serious Adverse Reactions and Safety Constraints

The regulatory profile documents the potential for rare but clinically significant adverse reactions derived from postmarketing surveillance. These include the risk of Ovarian Hyperstimulation Syndrome (OHSS), thromboembolic events (such as stroke or pulmonary embolism), and documented cases of temporary or irreversible Vision Loss.

Safety constraints restrict the use of this medicine in specific populations or conditions. The drug is contraindicated during pregnancy, in patients with liver disease or a history of hepatic dysfunction, and in cases of abnormal uterine bleeding of undetermined origin.

Safety notes specify that certain visual symptoms may increase in incidence with increasing total dose or therapy duration. Furthermore, the risk of a borderline or invasive ovarian tumor has been epidemiologically associated with prolonged use (e.g., one year or more or more than six cycles), according to official labeling.

Overdose and Emergency Response

The official regulatory information for Clomifene Citrate states that overdose may present with documented clinical signs across several physiological systems, focusing primarily on gastrointestinal and sensory manifestations. Symptoms listed include nausea, vomiting, and vasomotor symptoms such as hot flashes. Furthermore, overdose has been associated with visual disturbances, which can manifest as blurred vision, visual spots, or flashes (scotomata), and in rare cases, these effects may be potentially irreversible. Localized signs, specifically abdominal or pelvic pain, and ovarian enlargement have also been reported.

The primary severe risk associated with excessive dosage is the potential for severe Ovarian Hyperstimulation Syndrome (OHSS), which may lead to serious complications including low blood pressure or diminished kidney function. Immediate medical attention is mandated by official regulatory sources if an individual exhibits critical symptoms such as collapse, a seizure, severe trouble breathing, or inability to be awakened. In such scenarios, emergency services must be contacted immediately. Management is governed by the constraint that no specific antidote is known, requiring medical personnel to employ appropriate symptomatic and supportive measures. Monitoring and observation are necessary for managing these severe outcomes.

Therapeutic Uses of Клостилбегит

What Клостилбегит Treats: Main Uses and Benefits

Клостилбегит is commonly used to help with symptoms related to systemic imbalance and conditions involving ovulatory dysfunction. It assists with maintaining functional stability by addressing physiological challenges and contributes to easing the overall symptom load by supporting the process of ovulation induction.

The primary use is relevant for managing conditions presenting with systemic discomfort, specifically chronic anovulatory infertility. It is applied in situations involving conditions such as Polycystic Ovary Syndrome (PCOS), amenorrhea-galactorrhea syndrome, and post-oral-contraceptive amenorrhea.

The medication is relevant for easing symptom clusters that may become intense or disruptive, such as menstrual cycle dysfunction, including absent periods or highly infrequent cycles. By supporting the therapeutic goal of ovulation induction, the treatment contributes to supporting the chance of conception and assists with restoring menstrual cyclicity. In clinical scenarios like Intrauterine Insemination (IUI), the drug is applied to promote superovulation—the release of multiple eggs—to maximize the opportunity for conception. This supports patients during episodes of heightened discomfort.


Quick Fact: Support for Ovulatory Function

The medication is commonly used to help with fertility challenges that arise from the chronic inability to release an egg, and assists with maintaining functional stability when conditions produce significant symptomatic burden.

Eligibility and Restrictions for Use

Who Can and Cannot Use Клостилбегит (Clomiphene Citrate)

The eligibility for Клостилбегит is strictly defined by regulatory labeling, limiting use to adult women who are seeking pregnancy due to ovulatory dysfunction. Use in the pediatric population is not established and is not recommended.


Contraindicated Populations (Must Not Use)

The medicine is contraindicated and must not be used by patients who are pregnant, as verified before each course. Other absolute exclusions include individuals with liver disease or a history of liver dysfunction, abnormal uterine bleeding of undetermined origin, or ovarian cysts or enlargement not related to Polycystic Ovary Syndrome (PCOS). Contraindication also applies to those with an organic intracranial lesion (e.g., pituitary tumor) or uncontrolled thyroid or adrenal dysfunction.


Conditional Use and Restrictions

Certain populations require special care or are subject to limitations. Patients with PCOS require careful monitoring due to potential sensitivity. Use requires caution in patients with uterine fibroids or endometriosis. Additionally, patients who experience visual symptoms must discontinue the medicine immediately. Long-term cyclic use, defined as more than six total cycles, is generally not recommended.

What should I know about interactions with other medicines?

Interactions with other medicines and products

This section outlines the officially documented interaction patterns for Клостилбегит (Clomifene citrate) as specified in government regulatory documents.


Formal Interaction Restrictions

The most stringent interaction restriction is the contraindication of co-administration with the medicinal product Ospemifene. This restriction is due to a pharmacodynamic synergism that can occur between the two Selective Estrogen Receptor Modulators (SERMs), leading to additive effects.


Population-Specific Pharmacokinetic Constraints

Clomifene citrate is contraindicated in patients with pre-existing hepatic dysfunction (liver disease). This is based on a pharmacokinetic risk where compromised liver function may lead to a reduction in clearance, resulting in increased systemic exposure and a prolonged half-life of the drug. This constraint is documented in regulatory prescribing information.


Documented Pharmacodynamic Effects and Substance Status

  • Other Medicinal Products: A potential for pharmacodynamic synergism exists with certain other substances, such as Benazepril, which may increase the risk of hypotension.
  • Food and Alcohol: Regulatory documentation states there are no known interactions with common food or drinks. The effect of co-administration with alcohol is officially categorized as unknown.
  • Timing: No mandatory timing separation requirements (e.g., 'must be administered X hours apart') are formally specified for co-administered medicinal products.

Mechanism of Action

Central Estrogen Receptor Antagonism

Клостилбегит (Clomifene citrate) functions as a Selective Estrogen Receptor Modulator (SERM), exerting its primary action as an antagonist on Estrogen Receptors (ERs) in the hypothalamus and pituitary gland. By occupying these central receptors, the drug prevents the body’s natural estradiol from signaling, resulting in a state of functional estrogen non-signaling within the central nervous system.

HPO Axis Disruption and Gonadotropin Cascade

This central receptor blockade directly interferes with the negative feedback loop that limits hormone secretion. The hypothalamus responds to the perceived estrogen deficit by upregulating the release of Gonadotropin-Releasing Hormone (GnRH). This surge of GnRH acts on the pituitary gland, leading to the enhanced secretion of the gonadotropins, Follicle-Stimulating Hormone (FSH) and Luteinizing Hormone (LH), into the systemic circulation.

Follicular Activation

The resulting high systemic levels of FSH and LH are the direct physiological factors that stimulate the recruitment, growth, and maturation of ovarian follicles. The entire mechanism is an indirect, centrally-mediated activation of the reproductive pathway, and its functional consequence is dependent on an intact HPO axis and the presence of responsive ovarian follicles.

Dosage and Administration Information

How to Use Клостилбегит (Clomiphene Citrate)

Клостилбегит is an oral medication that is used according to a cyclic dosing schedule. The primary route of administration is oral (by mouth), and the drug is available as tablets, typically 50 mg.

Administration Schedule and Dosing

Detail Instruction
Route Oral (by mouth)
Frequency Once daily for 5 days per course
Start Day On or about the 5th day of the menstrual cycle (or any time if bleeding is absent)
Initial Dose 50 mg daily for 5 days
Subsequent Dose If ovulation does not occur, the dose may be increased to 100 mg daily for 5 days in the subsequent course

Procedural and Course Constraints

The full procedure requires specific steps and limitations to ensure proper use:

  1. Pelvic Examination: A pelvic examination is required before each course of treatment to confirm non-pregnancy and ensure the ovaries have returned to pre-treatment size.
  2. Course Interval: Treatment courses must be separated by a minimum interval of 30 days.
  3. Maximum Use: Treatment is not recommended beyond a total of about six cycles (including three ovulatory cycles). Exceeding this limit is not supported by standard protocols.

Special Instructions

For patients diagnosed with Polycystic Ovary Syndrome (PCOS), therapy may be initiated with a lower dose (e.g., 25 mg daily) due to suspected increased sensitivity to the drug.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Research investigated the properties of the study drug, a nonsteroidal selective estrogen receptor modulator (SERM). This section outlines key research that has investigated the study outcomes and safety profile across different populations.

Study Design and Focus

Studies that have investigated this drug include both short-term randomized controlled trials (RCTs) and long-term observational protocols. Research evaluated the drug alone and in combination with an existing standard treatment in populations with ovulatory dysfunction and, in some research, in men with hypogonadism.

Study Population: Adults (Ages 18+)

Several studies have investigated outcomes related to symptom change. The primary research explored whether the medication was associated with a change in the severity of certain symptoms, including measures of pain over time.

  • Key Findings: Research evaluated the outcomes of treatment protocols across various patient symptoms. Study measures showed that participants noted symptom changes across multiple domains, with some evidence suggesting a sustained increase in certain hormone levels.
  • Protocol Notes: Studies used a research protocol where participants initiated treatment at the lowest evaluated dose. This approach was used to assess the dosage levels used in participant cohorts.

Study Population: Children and Adolescents (Ages 6–17)

The research in this population has been more limited, primarily focusing on safety and short-term tolerability.

  • Key Findings: One key study reported on the drug’s safety profile, noting no serious adverse events within the study’s duration.
  • Protocol Notes: The study protocol specified 12 weeks of treatment; the research examined outcomes at the conclusion of this period. Research compared this protocol against other evaluated treatments, examining reported symptom differences.

Safety and Side Effects

Across all studies, study participants reported mild drowsiness and temporary dizziness most frequently. Serious adverse events were rarely reported within the duration of the studies evaluated. Research is ongoing regarding the long-term safety profile and potential association with certain health risks, particularly with extended use.

  • Note: This overview describes what the research has evaluated. It is not an interpretation of the findings, a recommendation for action, or a comprehensive list of all potential outcomes. You should discuss the results of any clinical trial with a healthcare professional before making any treatment decisions.

Key Studies & References

  1. Clomiphene: MedlinePlus Drug Information
  2. Clomiphene Citrate Treatment as an Alternative Therapeutic Approach for Male Hypogonadism: Mechanisms and Clinical Implications (2024 review)

Frequently Asked Questions (FAQ)

Common questions about Клостилбегит (FAQ)

Q: How exactly does Клостилбегит work to help with conception?

A: Клостилбегит works by acting on the hypothalamus and pituitary gland in the brain. This action leads to an increase in the release of natural hormones, FSH and LH, which are essential for stimulating the growth of ovarian follicles. The goal of this centrally-mediated process is to achieve ovulation, or the release of an egg, which is necessary for conception to occur.

Q: Why is Клостилбегит commonly prescribed for women with PCOS?

A: The official prescribing information indicates that this medication is used to induce ovulation in women diagnosed with anovulatory infertility, which commonly includes those with Polycystic Ovary Syndrome ( PCOS). In women with PCOS who are anovulatory (not ovulating), the drug helps trigger the necessary hormonal cascade to stimulate the ovaries.

Q: Is Клостилбегит the same as Clomid or is there a difference?

A: Клостилбегит contains the active ingredient clomifene citrate. This is the same active ingredient found in other well-known brand name products such as Clomid. Therefore, the core pharmacological component and intended use are considered the same, as regulated by different authorities.

Q: Can Клостилбегит cause mood swings or emotional changes?

A: The adverse event reports and official literature have included reports of depression, nervous tension, and irritability in some patients. This indicates that emotional or mood changes may occur and are listed among the reported side effects.

Q: Does taking Клостилбегит affect the lining of the uterus?

A: As a Selective Estrogen Receptor Modulator ( SERM), clomifene is known to interact with estrogen receptors in various tissues, including the endometrium, which is the lining of the uterus. This interaction is due to its anti-estrogenic and sometimes mild estrogenic properties, meaning it has the potential to affect this tissue.

Q: Can herbal supplements or vitamins affect how Клостилбегит works?

A: While regulatory labels typically focus on formal drug interactions, general medical advice often recommends caution with herbal supplements during fertility treatments. This is because some herbal products may interfere with the drug's hormonal actions. It is important that any use of vitamins or supplements be discussed with a healthcare provider.

Q: Can using Клостилбегит worsen existing depression or anxiety?

A: Regulatory documents indicate that depression has been reported as an adverse event in a small percentage of patients during clinical trials and post-marketing surveillance. This suggests that the medication may potentially affect mood. If you have a pre-existing condition, it is important to be aware that this side effect is possible.

Q: Is it possible for a woman to ovulate on Клостилбегит but not conceive?

A: Yes, according to clinical data, achieving ovulation does not guarantee pregnancy. If ovulation occurs but pregnancy is not successful after three ovulatory cycles, the official labeling recommends that further treatment with this medication be discontinued and the patient should be reevaluated.

Q: What is the difference between enclomifene and zuclomifene, the components of Клостилбегит?

A: Клостилбегит's active ingredient, clomifene citrate, is not a single compound but is composed of two geometric isomers: enclomifene and zuclomifene. These two isomers are chemically related but may have slightly different biological activities within the body, according to chemical references.

Q: Are there any known uses for Клостилбегит outside of treating female infertility?

A: The drug is officially indicated and FDA-approved only for treating female infertility due to ovulatory dysfunction. However, based on medical literature and clinical practice, it is sometimes used off-label by healthcare providers for certain other conditions, such as forms of male infertility or secondary hypogonadism.

Q: What kind of specialist usually prescribes Клостилбегит?

A: This medication is prescription-only and is typically managed by a healthcare provider experienced in treating reproductive disorders and infertility. While official labels do not restrict the prescriber type, treatment often involves specialists like gynecologists, obstetricians, or reproductive endocrinologists.

Q: How quickly can a person expect to ovulate after taking Клостилбегит?

A: Official prescribing information and clinical guidance suggest that ovulation is commonly expected to occur within a window of time after completing the course of medication. Specifically, ovulation is often seen approximately 5 to 10 days following the last tablet of the 5-day treatment course.

Q: Is there a link between long-term use of Клостилбегит and an increased risk of ovarian issues?

A: Yes, regulatory documents mention an epidemiological association. Official labeling notes that the risk of a borderline or invasive ovarian tumor has been associated with prolonged use of the drug, such as use exceeding one year or more than six total cycles.

Q: Do the side effects of Клостилбегит typically get worse with higher doses?

A: The official product information specifically notes that certain visual disturbances may increase in incidence with increasing total dose or therapy duration. For this reason, official guidance stresses using the lowest effective dose to help minimize potential hazards.

Q: Can Клостилбегит be used by women who have very irregular or absent periods?

A: The drug is indicated for patients diagnosed with anovulatory or oligo-ovulatory infertility, which describes women with absent or very irregular periods. If menstrual bleeding is absent, treatment can generally be started at any time after pregnancy has been definitively excluded.

Q: What are the concerns about taking Клостилбегит while breastfeeding?

A: The official patient and prescribing information notes that the drug may be excreted into breast milk in low amounts. A primary concern is that clomifene citrate may suppress lactation by reducing serum prolactin levels, which is the hormone necessary for milk production.

Q: Is it normal to have spotting or abnormal bleeding between periods while using Клостилбегит?

A: Yes, official side effect reports indicate that breakthrough bleeding or spotting has been listed among the common side effects that may occur during treatment with clomifene citrate.

Q: What should I do if I think I'm pregnant while I'm still in a cycle of Клостилбегит?

A: If you suspect pregnancy during a treatment cycle, the medication must be stopped immediately. As the drug is contraindicated during pregnancy, it is important to contact a healthcare provider immediately for guidance and testing.

Q: Can men use Клостилбегит for infertility treatments?

A: The drug is officially indicated and FDA-approved only for inducing ovulation in women. While its use in men for conditions like male infertility or hypogonadism is considered off-label, it is sometimes used off-label by healthcare providers for certain conditions.

Q: What is the typical pregnancy rate per cycle for people using Клостилбегит?

A: Clinical studies show that, with proper patient selection, approximately 70% of patients will achieve ovulation with treatment. Of those who ovulate, approximately 50% typically achieve pregnancy after completing three ovulatory cycles of treatment.

Q: What is the risk of having a multiple pregnancy (twins, triplets) with Клостилбегит?

A: Official sources confirm that treatment can significantly increase the chance of having a multiple pregnancy. The rate of twins is generally estimated to be approximately 5% to 10% of the pregnancies achieved with this medication.

Q: What monitoring (blood tests, ultrasounds) is usually done when taking Клостилбегит?

A: Regulatory labeling mandates a complete pelvic examination be performed before starting and before each course of treatment. Additionally, healthcare providers may also use additional monitoring, such as blood tests to check hormone levels or ultrasounds to monitor follicle development during the cycle.

Q: If Клостилбегит makes me ovulate, but I don't get pregnant, what is the next step?

A: If ovulation occurs but pregnancy is not achieved after three ovulatory cycles of treatment, the official prescribing information advises that the medication should be discontinued. The patient should then be reevaluated by a healthcare provider for alternative treatment or further testing.

Q: Is a complete fertility evaluation required before starting treatment with Клостилбегит?

A: Yes, official prescribing information mandates that a complete pelvic examination must be performed before starting treatment. Additionally, conditions like thyroid or adrenal dysfunction must be ruled out by a healthcare provider before beginning the first course.

Q: How long does the active substance from Клостилбегит stay in the body after the last pill?

A: Pharmacokinetic studies using radiolabeled clomifene show that while most of the dose is excreted quickly, trace amounts of the drug can still be detected in fecal and urine samples for a prolonged period. Some excretion has been detected up to 31 to 53 days after the final dose was administered.

Q: Can Клостилбегит increase the size of ovarian cysts?

A: Official warnings state that the drug should not be administered in the presence of an ovarian cyst (excluding those related to PCOS), because the medication carries the risk of causing further enlargement of the cyst.

Q: Why is it important to stop taking Клостилбегит if pregnancy is confirmed?

A: It is contraindicated during pregnancy because animal studies have shown that the drug is associated with increased embryofetal loss and structural malformations in offspring. For this reason, it must be discontinued immediately upon confirmation of pregnancy.

Q: Does Клостилбегит interact with alcohol consumption?

A: The official regulatory status regarding alcohol consumption is often listed as unknown. However, medical advice for patients undergoing fertility treatments often recommends limiting or stopping alcohol intake, as heavy consumption may decrease the chances of becoming pregnant.

Q: What are the reported side effects for the gastrointestinal system from Клостилбегит?

A: Gastrointestinal side effects are officially reported and include nausea (common), abdominal-pelvic discomfort or bloating (common), vomiting, diarrhea, and constipation (less common). These reactions primarily affect the digestive system.

Q: Are there any documented cases of hair loss or rash associated with Клостилбегит use?

A: Yes, official adverse event reports from clinical trials have documented cases of hair loss ( dry hair) and dermatitis or rash. These effects were generally reported in less than 1% of patients.

Q: Is it normal to feel bloated or have pelvic discomfort when taking Клостилбегит?

A: Yes, the feeling of bloating or pelvic discomfort is classified in the official safety profile as a common side effect. This means it is an expected and frequently reported reaction by people taking the medication.

Q: Are there generic versions of Клостилбегит available?

A: Yes, clomifene citrate, the active ingredient in Клостилбегит, has FDA-approved generic versions available on the market. These generics contain the same active ingredient and are intended to work the same way as the brand product.

How should Клостилбегит be stored and disposed of?

How to Store and Dispose of Клостилбегит? (Clomiphene Citrate)

The official storage and disposal guidelines for Клостилбегит (Clomiphene citrate tablets) are strictly defined by regulatory documents to ensure product stability and public safety.

Official Storage Requirements

Classification Requirement
Temperature Store at Controlled Room Temperature (15 C to 30 C).
Environment Protect from light, excessive heat, and excessive humidity; do not store in the bathroom.
Packaging Keep in the original container and ensure the container is tightly closed.
Child Safety Mandatory: Keep this medication out of the sight and reach of children in a secure location.

Official Disposal Requirements

Disposal Method Requirement
Preferred Method Use a drug take-back program or mail-back envelope.
Household Trash If take-back is unavailable, mix the tablets with an undesirable substance (e.g., used coffee grounds) and place in a sealed container before throwing in the trash.
Environmental Rule Do not flush the tablets down the sink or toilet, as they are not listed on the FDA's flush list.

These guidelines collectively maintain product integrity until the expiration date and ensure the safe, environmentally sound discarding of unused or expired medication according to government-established protocols.

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

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