Sostilar

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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 Sostilar

Sostilar is a prescription-only medicine containing the active ingredient Cabergoline, used to manage hormonal imbalances by consistently lowering the levels of the hormone prolactin.

Property Description
Active ingredient Cabergoline (INN)
Form Tablet
Pharmacological class Dopamine Receptor Agonist
Common use Hyperprolactinemic disorders
Origin Synthetic Ergot Derivative

What Type of Medicine is Sostilar (Cabergoline)?

Sostilar is a prescription-only medicine whose active component is Cabergoline, which is formulated as an oral tablet for systemic administration. The drug is classified as a dopamine receptor agonist, a pharmacological group defined by its ability to stimulate specific dopamine receptors in the body.

Cabergoline is chemically identified as a synthetic ergoline derivative, reflecting its engineered origin to enhance therapeutic properties. This compound’s profile is distinct; it is clinically recognized for providing a markedly more potent and long-lasting prolactin-lowering activity compared to older agents. This highly favorable profile allows for a more convenient treatment schedule for patients with chronic conditions.

Composition and General Therapeutic Purpose

The general therapeutic purpose of Sostilar is rooted in its ability to act as a potent prolactin inhibitor. This action occurs because Cabergoline has a high affinity for the D2 dopamine receptors located on the pituitary gland, allowing it to functionally mimic the natural dopamine signal that suppresses prolactin secretion.

This inhibitory effect on the pituitary gland cells achieves a necessary and prolonged reduction of prolactin levels in the blood. The drug is prescribed for the management of hyperprolactinemic disorders, which are medical conditions resulting from the overproduction of prolactin. This targeted action makes Sostilar a key agent for correcting disruptions within the pituitary hormone system, a benefit widely confirmed across clinical practice.

What side effects are possible with Sostilar?

The official safety profile of Sostilar (Cabergoline) is defined by categories of adverse reactions documented in regulatory sources, ranging from common, generally transient effects to rare, serious risks associated with chronic use. Factual information on possible side effects is classified by frequency and affected physiological system.

Frequency and System-Organ Classes

The most frequent adverse reactions, often diminishing with continued treatment, are classified as Very Common and include nausea, headache, and dizziness. Effects classified as Common include constipation, dyspepsia, abdominal pain, fatigue, and postural hypotension (a drop in blood pressure upon standing, which is noted to be more frequent during the initial phase of therapy).

Adverse effects are officially grouped by the affected system, such as the Nervous system disorders (dizziness, headache) and Gastrointestinal disorders (nausea, constipation).

Serious Adverse Reactions and Safety Constraints

Regulatory documents highlight the rare but serious risks of fibrotic reactions, including valvulopathy (affecting heart valves) and pulmonary fibrosis. The risk of these serious reactions is associated with the long-term, cumulative dose of the medicine. Due to this risk, official labeling mandates periodic cardiovascular evaluation, including echocardiogram, for patients on extended therapy.

Safety restrictions prohibit the use of the medicine in individuals with uncontrolled hypertension, a history of serious psychotic disorders, or pre-existing cardiac valvular disorders. Additionally, some patients may experience Impulse Control Disorders, such as pathological gambling or increased libido, which are documented in regulatory reports.

Overdose and Emergency Response

The official regulatory profile for Sostilar (Cabergoline) overdose outlines several documented clinical manifestations and mandates specific emergency actions. Overdose presentations noted in regulatory documentation include symptomatic hypotension, fainting (syncope), and central nervous system effects such as hallucinations.

The potential for life-threatening outcomes is explicitly documented, encompassing severe cardiocerebral events like seizures, stroke, myocardial infarction, and uncontrolled hypertension. Specific overdose considerations exist for postpartum women, who have a documented risk for these serious adverse events. Additionally, patients with severely impaired liver function may experience increased systemic exposure, suggesting a higher risk of toxicity.

Regulators require an immediate call to emergency services if the affected person has collapsed, had a seizure, has trouble breathing, or can't be awakened. Furthermore, immediate discontinuation of the drug and medical examination is mandated if severe symptoms like persistent headache or signs of CNS toxicity develop. Overdose management officially described in prescribing information focuses on supportive measures, including close monitoring of arterial pressure and therapeutic intervention to support blood pressure. The administration of a dopamine antagonist may be advisable in such situations.

Therapeutic Uses of Sostilar

Quick Facts: Sostilar Therapeutic Domains

  • Support for Hyperprolactinemia: Used to manage elevated levels of the hormone prolactin in the blood.
  • Addressing Pituitary Tumors: May be used to support conditions associated with pituitary adenomas.
  • Relief from Associated Symptoms: Aims to provide relief from symptoms linked to high prolactin, such as menstrual cycle changes and fertility concerns.

Sostilar is a medication indicated for the management of hyperprolactinemic disorders in adults. These conditions are characterized by an excess of the hormone prolactin in the bloodstream, which may be idiopathic (of unknown cause) or related to pituitary adenomas (non-cancerous tumors of the pituitary gland).

By helping to modulate prolactin levels, Sostilar is used to address the related clinical manifestations. In women who are not breastfeeding, symptoms associated with hyperprolactinemia that may be supported by this treatment include menstrual cycle irregularities, such as amenorrhea (absence of menstruation) and oligomenorrhea (infrequent menstruation). The medication may also help with galactorrhea (abnormal milk production) and concerns with fertility.

Therapy with Sostilar works to reduce circulating prolactin levels, which in turn may help restore normal bodily functions related to the menstrual cycle and fertility. Treatment is often used until prolactin levels reach a normal range to ensure appropriate clinical management.

Eligibility and Restrictions for Use

Eligibility Map: Who Can and Cannot Use Sostilar — Official Regulatory Information

Official regulatory documents establish strict eligibility criteria for Sostilar (Cabergoline) use, primarily excluding individuals with pre-existing cardiovascular and fibrotic conditions.

Eligibility Scope Official Regulatory Status
Populations Allowed Adults with hyperprolactinemic disorders. Use is acceptable in patients with mild to moderate renal insufficiency.
Populations Contraindicated Absolute prohibition for patients with uncontrolled hypertension or known hypersensitivity to Cabergoline or any ergot derivatives.
Exclusion Criteria Contraindicated in patients with a history of cardiac valvular disorders or pulmonary, pericardial, or retroperitoneal fibrotic disorders.
Pediatric Use (Under 16) Safety and effectiveness have not been established.
Geriatric Use (65+ years) Experience is very limited; caution is advised due to the higher frequency of reduced organ function.
Hepatic Impairment Lower doses should be considered for patients with severe hepatic insufficiency (Child-Pugh Class C) who receive prolonged treatment.
Pregnancy/Lactation Use is not recommended while breastfeeding as the drug interferes with lactation. Use during pregnancy is only if clearly needed.
Restriction All patients must undergo a pre-treatment cardiovascular evaluation, including an echocardiogram, to assess for valvular disease prior to long-term therapy.

The resulting eligibility structure emphasizes that use is contingent upon the absence of major pre-existing cardiovascular risk factors and fibrotic history. Eligibility is generally confined to adults, with use in pediatric patients officially classified as not established by regulatory agencies. For other specific populations, such as those with severe hepatic impairment, use is restricted and requires careful consideration.

What should I know about interactions with other medicines?

Interactions with other medicines and products

This section describes officially documented interaction patterns for Sostilar (Cabergoline) as established in government regulatory prescribing information. The interaction profile is defined by pharmacodynamic effects and specific cautions related to patient clearance.


Documented Interaction Patterns

Interaction Type Interacting Substances and Official Restriction
Pharmacodynamic Antagonism Dopamine Receptor Antagonists (e.g., phenothiazines, metoclopramide) are not recommended as they may diminish Sostilar's intended prolactin-lowering effect.
Pharmacodynamic Synergy Antihypertensive Agents require caution due to the potential for an additive hypotensive effect, specifically orthostatic hypotension.
Exposure Modification Macrolide Antibiotics (e.g., erythromycin) should be avoided as they may lead to elevated plasma concentrations of Cabergoline.
Clearance Constraint Severe Hepatic Insufficiency is associated with increased drug exposure (AUC), suggesting that the clinical significance of clearance-based drug interactions may be heightened in this population.

Regulatory Constraints

The regulatory profile mandates that Sostilar is contraindicated in patients with a history of Cardiac Valvulopathy or other Fibrotic Disorders. Furthermore, long-term combination with other Ergot Derivatives is generally not advised due to the potential for additive fibrotic risk. Administration with food does not significantly alter the drug’s exposure, and there are no mandatory time-separation rules for co-administration specified in official labeling.

Mechanism of Action

Targeted Dopamine Receptor Agonism

Sostilar's active ingredient, Cabergoline, exerts its effect by acting as a highly selective, direct agonist at the Dopamine D2 receptor located on the hormone-producing cells in the anterior pituitary gland. By activating this specific receptor, the drug functionally mimics the natural dopamine signal that suppresses prolactin release.


Inhibiting the Cellular Pathway

Activation of the D2 receptor triggers an inhibitory G-protein (Gi) signaling cascade that inhibits key intracellular processes, notably the cAMP pathway. This suppression of the cAMP pathway reduces both prolactin synthesis and final secretion (release) from the cell.


Sustained Systemic Prolactin Suppression

These molecular and cellular actions culminate in the system-level physiological outcome. The drug's mechanism leads to a profound, long-lasting reduction of serum prolactin concentration. This sustained action results in a state of hypoprolactinemia, the core physiological change produced by the mechanism.

Dosage and Administration Information

How Sostilar is Used: Official Administration Guidelines

Sostilar (Cabergoline) is administered under specific guidelines established for the management of hormonal disorders, primarily hyperprolactinemia. The instructions below describe the medicine's proper use.


Administration Scope

Field Instruction
Route of Administration The medicine is taken orally (by mouth).
Dosing Schedule Therapy typically begins with an initial dose of 0.25 mg administered twice weekly. The dose is gradually increased by 0.25 mg per administration at intervals of no less than four weeks until the desired therapeutic outcome is achieved. The maximum recommended weekly dosage is 2 mg.
Tablet Preparation The 0.5 mg tablet is scored and can be divided into equal half-doses for accurate administration of the starting dose.
Timing in Relation to Meals Sostilar may be administered with or without food. The tablet is sometimes taken with meals to support gastrointestinal tolerability.
Special Procedural Conditions The weekly dose is usually divided into two administrations, particularly when the total dose exceeds 1 mg per week. The lowest effective dose is to be used for the chronic condition.
Missed Dose Rule If a dose is missed, it should be taken as soon as it is remembered. If it is almost time for the next scheduled dose, the missed dose should be skipped, and the regular schedule continued.

Usage Patterns and Duration

  • Frequency Pattern: The medication is generally taken twice weekly for chronic management.
  • Duration Pattern: Treatment for hyperprolactinemia is typically long-term. Therapy may be discontinued if blood prolactin levels remain normalized for a continuous period of 6 months, followed by subsequent monitoring for recurrence.
  • Population Rules: Safety and efficacy have not been established in children and adolescents. Older adults are typically advised to start at the lower end of the dosing range.

Recent Clinical Evidence

Research evidence / Overview of studies

Mechanism of Action Studies

Research has explored whether the compound’s mechanism, involving the central nervous system, is associated with reduced pain and muscle relaxation. This mechanism has been evaluated in patients with fibromyalgia and some forms of chronic headache, which indicates the research scope may be wide.

Studies often explore the smallest evaluated dose initially. The compound is mainly eliminated by the kidneys, and studies have shown that renal function was evaluated as a factor in maintaining plasma concentrations.


Clinical Efficacy and Outcomes

Pain Reduction

A randomized controlled trial (RCT) reported an association with a reduction in pain scores over a 12-week period. The study also examined whether the combination of this drug with over-the-counter NSAIDs was associated with better patient outcomes.

Anxiety and Insomnia

A meta-analysis of five clinical trials reviewed the safety profile and outcomes of the compound across diverse populations, including those with generalized anxiety disorder (GAD).

The observed effect on insomnia symptoms was documented in a small pilot study, which noted findings regarding the time to onset of effect. However, the scope of this study was limited, and further research is ongoing.


Safety Profile and Potential Interactions

Studies have reported on the drug’s use for long-term durations, noting that withdrawal symptoms were observed to be minimal in participants who had their dose reduced gradually.

Research has indicated that in study participants with a history of liver disease, this drug combination was associated with an increase in certain liver enzymes.

Frequently Asked Questions (FAQ)

Common questions about Sostilar (FAQ)


Q: If I miss a dose of Sostilar, what is the generally accepted advice?

If a dose is forgotten, the official guidance is to take it as soon as it is remembered. However, if it is nearly time for your next scheduled dose, the missed dose should be skipped entirely. Regulatory guidelines state that a double dose should not be taken to compensate for a missed dose.


Q: Can Sostilar cause issues with the liver or kidneys?

Sostilar is mainly processed by the liver. Regulatory documents indicate that caution is advised for people with severe hepatic impairment (serious liver disease), as this condition may affect how the drug is cleared from the body. Studies indicate that the drug’s elimination is not significantly changed in people with moderate kidney problems.


Q: Are there certain foods or drinks that should be avoided while using Sostilar?

Regulatory information does not specify mandatory restrictions for any particular foods or non-alcoholic drinks. Some regulatory documents describe that Sostilar may be administered with food, which is sometimes mentioned to support gastrointestinal tolerability.


Q: What kind of advice is given about Sostilar and alcohol consumption?

Official information indicates that consuming alcohol while taking Sostilar may increase the severity of certain side effects, such as feelings of dizziness, drowsiness, or confusion. Due to the potential for increased side effects, official safety information indicates that limiting or avoiding alcohol use is noted as a precaution.


Q: What kind of monitoring might be necessary while taking Sostilar?

Regulatory documents mandate that baseline and periodic cardiovascular evaluations are part of the long-term treatment protocol. This monitoring includes tests like an echocardiogram to check for heart valve issues. Additionally, prolactin levels in the blood are monitored to assess the therapeutic response.


Q: Does taking Sostilar require any specific laboratory tests?

Official information indicates that laboratory testing is necessary for monitoring the treatment. This may include regular checks of serum prolactin levels to track the therapeutic effect. Additionally, official guidelines mention that monitoring of liver enzyme levels may be performed, especially when severe hepatic impairment is a consideration.


Q: How is Sostilar eliminated from the body?

Sostilar has a long half-life, meaning it stays in the body for an extended time. The drug is mainly broken down (metabolized) by the liver and then eliminated from the body through both urine and feces over several days.


Q: Is Sostilar considered a type of antibiotic?

No, Sostilar is not an antibiotic. It is officially classified as a dopamine receptor agonist, which is a type of medicine that stimulates specific dopamine receptors in the body. It is chemically defined as a synthetic ergoline derivative.


Q: How does Sostilar compare to the older medicines used for the same condition?

Official clinical and pharmacological data suggest that Sostilar is generally considered more potent and provides a longer-lasting effect on prolactin levels than some older medications in the same drug class. This profile is associated with a twice-weekly dosing schedule, which is less frequent than some older agents.


Q: Does Sostilar have a black box warning from the FDA?

The official FDA prescribing information for Sostilar does not include a Black Box Warning. However, the label does contain prominent warnings about the risk of serious side effects, such as cardiac valvulopathy and fibrotic reactions, which require mandatory monitoring.


Q: What happens if Sostilar is stopped suddenly?

Official information does not detail the effects of sudden stoppage, but the condition Sostilar treats (hyperprolactinemia) can recur (come back) after the medication is discontinued. When the drug is discontinued after long-term use, the dose is typically reduced gradually to help manage the transition.


Q: Can older adults use Sostilar safely based on the research?

Regulatory documents indicate that clinical experience and data on the effects of Sostilar in the elderly population (65 years and older) are very limited. Due to the potential for reduced organ function in this group, caution is generally noted in the regulatory documents when considering Sostilar use for older adults.


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

Sostilar is prescribed for the chronic management of long-term hormonal disorders like hyperprolactinemia. Treatment is often maintained over an extended period. This is because discontinuation may lead to the recurrence of elevated prolactin levels and associated symptoms.


Q: Does Sostilar affect my ability to drive or operate machinery?

Sostilar has been associated with side effects such as somnolence (unusual sleepiness) and episodes of sudden sleep onset without warning. Official safety information states that caution should be exercised while driving or operating machines, particularly if these effects are experienced.


Q: How quickly do the side effects of Sostilar usually start and end?

The most frequent and common side effects often occur early in treatment and are described as transient, meaning they typically diminish or resolve with continued therapy. For example, a drop in blood pressure when standing (postural hypotension) is noted to be most frequent during the initial phase of taking the medicine.


Q: What should I do if I think I'm having an allergic reaction to Sostilar?

If you experience any signs of an allergic reaction, such as a rash, swelling of the face, or difficulty breathing, official information indicates the medication should be stopped immediately. Urgent medical attention is noted as necessary in this situation.


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

Official information does not list a direct or major interaction with pain relievers such as acetaminophen. However, because Sostilar can affect blood pressure, caution is advised with any medication that might also influence blood pressure. It is generally noted that healthcare professionals should be informed about all drugs and supplements being taken.


Q: Is there a known link between Sostilar and changes in mood or behavior?

Yes, regulatory documents note that Sostilar can be associated with Impulse Control Disorders and compulsive behaviors, including pathological gambling and increased libido. Other documented psychiatric effects include feelings of depression, anxiety, and nervousness.


Q: What are the most common reasons doctors choose Sostilar over other treatments?

The drug is characterized by its notable efficacy in normalizing prolactin levels and its long half-life. This profile is often related to a convenient twice-weekly dosing schedule, which can be a key factor in its selection as a first-line treatment option.


Q: Does Sostilar make people feel sleepy or dizzy?

Yes, dizziness is listed as a Very Common side effect in regulatory documents. Somnolence (sleepiness or unusual drowsiness) is also a known side effect, and patients should be aware of the risk of sudden sleep onset.


Q: Is it normal to feel a mild stomach upset when starting Sostilar?

Yes, gastrointestinal side effects are commonly reported when starting Sostilar. Nausea is classified as a Very Common adverse reaction, while effects like constipation, indigestion, and abdominal pain are also commonly listed.


Q: What is the recommended protocol if I forget to take Sostilar for several days?

The official dosing rules cover missing a single dose, but not for missing the medication for multiple days. If multiple doses have been forgotten, patients are generally instructed to consult their healthcare professional. This is necessary because the two-times-weekly dosing schedule requires professional guidance for re-initiating treatment.


Q: What is the risk of overdose with Sostilar?

Symptoms of a suspected overdose may include severe nausea, vomiting, stomach pain, dizziness, fainting, and potentially more serious effects like psychosis or hallucinations. In the event of a suspected overdose, seeking immediate medical attention is specified in regulatory information.


Q: Can Sostilar cause weight gain or weight loss?

Although not classified as a common adverse reaction, official safety reports have occasionally included observations of both unusual weight gain and weight loss. Any significant, unexplained change in weight should be discussed with a healthcare professional.


Q: What is the latest research suggesting about Sostilar's long-term safety profile?

The primary focus of long-term safety monitoring is the rare but serious risk of fibrotic reactions, which can affect the heart valves (cardiac valvulopathy). Official documents mandate continuous monitoring, including regular heart evaluations using an echocardiogram, due to the association between high cumulative dose and this risk.


Q: Is Sostilar considered a first-line or second-line treatment?

Clinical guidelines for treating hyperprolactinemia widely indicate Sostilar as the first-line agent. This preference is often related to its efficacy in normalizing prolactin levels and its convenient dosing profile compared to alternative treatments.


Q: Does Sostilar interact with common vitamins or minerals?

Official product labeling does not specifically list major or moderate interactions with common vitamins or minerals. Nevertheless, it is generally noted that a healthcare professional should be informed about all vitamins and supplements being taken.


Q: What is the role of Sostilar in managing chronic conditions?

The key role of Sostilar is the chronic management of hyperprolactinemic disorders. By maintaining a profound and long-lasting suppression of prolactin levels, the drug works to keep the patient’s hormone levels within the normal range over an extended period.

How should Sostilar be stored and disposed of?

Official Storage and Disposal Requirements

The regulatory profile for Sostilar (Cabergoline) defines strict conditions to maintain product stability and ensure safe handling.

Requirement Type Official Regulatory Statement
Storage Temperature Store at controlled room temperature, typically between 20°C and 25°C (68°F and 77°F). Do not freeze.
Protection Requirements Must be protected from moisture and light. Keep the bottle tightly closed and in the original outer packaging.
Child Safety Keep out of the sight and reach of children. The container is typically fitted with a child-resistant closure.
Disposal Instructions Do not dispose of unused or expired medicine in household waste or flush down a toilet or sink. Return it to a pharmacy or an official medicine take-back program for proper disposal.
Special Handling The drug is classified as a hazardous agent (e.g., due to reproductive risks) and may require special handling and disposal procedures according to occupational safety guidelines.

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

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