Стаг

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Стаг

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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 Стаг

What is Стаг? Identity and Pharmacological Class

Property Description
Active ingredient Stavudine (d4T)
Form Oral capsule, Oral solution
Pharmacological class Nucleoside Reverse Transcriptase Inhibitor (NRTI)
General purpose Slows HIV replication
Origin Synthetic (thymidine analogue)

Стаг is the trade name for the antiretroviral agent Stavudine, a synthetic drug utilized in the management of Human Immunodeficiency Virus (HIV) infection. The active compound, Stavudine (d4T), is classified pharmacologically as a Nucleoside Reverse Transcriptase Inhibitor (NRTI). This chemical classification indicates that the substance is a chemically manufactured thymidine nucleoside analogue, specifically engineered to interfere with viral processes. The clinical profile of Stavudine is characterized by its capacity to suppress viral load. Стаг is defined as a single-ingredient product, containing only Stavudine as the primary pharmaceutically active component.


General Purpose and Mechanism of Action Summary

The general purpose of Стаг is to significantly slow down the replication rate of HIV within the body, thereby managing the infection and helping to preserve the immune system. A typical use scenario involves incorporating Stavudine into a combination therapy regimen designed to maintain a suppressed viral load. It achieves this by acting as a chain terminator: when the HIV virus attempts to copy its own genetic material using the enzyme reverse transcriptase, the drug’s active form, stavudine triphosphate, is mistakenly incorporated. Stavudine serves as a component of antiretroviral therapy for HIV in various settings, playing a role in the management of this chronic condition. This key molecular interaction halts the process of viral DNA synthesis, limiting the virus’s ability to multiply.


Available Forms and Physical Presentation

Стаг is an antiretroviral agent designed for oral administration, meaning it is taken by mouth. The active ingredient, Stavudine, is delivered in two main physical drug forms: an oral capsule and an oral solution (liquid). This distinction is a key differentiating feature that allows healthcare providers to utilize the liquid form for pediatric patients or individuals who cannot swallow capsules. The availability of both the oral capsule and the liquid oral solution ensures flexibility, allowing for appropriate administration in diverse patient populations.

Regulatory References

  1. NIH Stavudine Drug Information
  2. WHO EML Recommendation on Stavudine
  3. WHO Model List of Essential Medicines

What side effects are possible with Стаг?

Possible Side Effects and Safety Information

The safety profile for Стаг (Stavudine) is formally documented by government regulatory agencies, outlining potential adverse reactions classified by frequency and affected physiological systems. This information is critical for defining the medicine's risk framework.

Serious Adverse Reactions and Black Box Warnings

The most serious safety concerns documented in regulatory labeling include the risk of Lactic Acidosis and Severe Hepatomegaly with Steatosis (enlargement of the liver with fat buildup), which may be fatal. Severe Peripheral Neuropathy (nerve damage) and Pancreatitis (inflammation of the pancreas) are also listed as potentially serious adverse reactions.

Frequency Classification and System-Organ Effects

Adverse reactions are classified by frequency according to regulatory standards:

Frequency Category Representative Adverse Reactions
Very Common (ge 1/10) Peripheral neuropathy, Headache, Diarrhea, Nausea.
Common (ge 1/100 to < 1/10) Vomiting, Abdominal pain, Rash, Lipoatrophy.

Side effects frequently involve the Nervous System (e.g., neuropathy, motor weakness), Metabolism and Nutrition (e.g., lactic acidosis, hyperlactatemia), and the Gastrointestinal System.

Exposure-Related Safety and Constraints

The incidence and severity of certain effects, particularly Peripheral Neuropathy and Lipoatrophy (loss of subcutaneous fat), are officially documented as being cumulative over time and associated with long-term exposure. Regulatory safety statements advise against co-administration with certain other drugs, such as Didanosine, due to a significantly increased risk of severe toxicity. Furthermore, safety notes exist for specific groups, including pregnant individuals and patients with pre-existing hepatic impairment.

Overdose and Emergency Response

The official regulatory profile for Stavudine (Стаг) overdose establishes the necessity of seeking immediate medical care due to the risk of severe, life-threatening complications. Government authorities mandate that you contact a poison control center or emergency room right away following any suspected overdose, even if no outward symptoms are apparent.

Overdose manifestations documented in regulatory labeling include symptoms of peripheral neuropathy, such as numbness and pain in the hands or feet, alongside general systemic effects like vomiting, profound tiredness, and unexpected shortness of breath. Urgent action is required to call emergency services if the individual has collapsed, is seizing, or is experiencing difficulty breathing.

Overdose risk is critically defined by the potential for severe toxicity, specifically Lactic Acidosis and Severe Hepatomegaly with Steatosis, both of which are documented as potentially fatal outcomes. If signs of such severe toxicity are clinically suspected, the immediate suspension of the medication is required.

Management is strictly symptomatic and supportive, as no specific antidote is known. Stavudine is established to be removable by the procedural measure of hemodialysis. Regulatory documents also note that clearance is reduced in patients with renal impairment, and female gender and obesity are recognized risk factors for severe acidosis.

Therapeutic Uses of Стаг

The primary therapeutic use of Стаг (Stavudine) is the management of Human Immunodeficiency Virus (HIV) infection, a chronic condition that creates noticeable physiological strain. It is used in combination with other medications to treat this infection, and is used to assist in the management of the virus in the body.

In clinical settings, this medication is used for the treatment of HIV-1 infection in both adults and children.


Managing Chronic HIV Infection and Viral Load

This medication is primarily applied in contexts marked by the increased discomfort and symptoms related to systemic imbalance. Its application is focused on addressing the physiological markers related to the virus, which is relevant for managing the quantity of virus in the bloodstream. The main therapeutic benefit is supporting long-term viral control, which is considered relevant for managing the infection as a stable chronic condition.


Preserving Immune System Health

By assisting with controlling viral activity, Стаг supports the immune system, and may assist with managing symptoms linked to organ-specific functional stress. This may contribute to managing conditions marked by increased physiological stress and illnesses. This helps ease and contributes to easing the overall symptom load.


Quick Fact: Relief for Systemic Imbalance

Стаг is commonly used to help with conditions involving episodic or fluctuating manifestations of HIV, specifically to assist with easing the progression of the disease and supporting the patient by contributing to easing the risk of serious health complications.

Regulatory References

  1. NIH MedlinePlus overview of Stavudine

Eligibility and Restrictions for Use

Official Eligibility Profile for Стаг (Stavudine)

Classification Eligibility Rule (Regulatory Basis)
Contraindicated Patients with known hypersensitivity to stavudine or any component of the formulation [2.3]. The co-administration with didanosine (ddI) is also contraindicated due to increased risk of serious adverse events [2.3].
Approved Use Established for the treatment of HIV-1 infection in both adults and pediatric patients [3.5].
Restricted/Conditional Use in adult patients with impaired renal function (creatinine clearance le 50 mL/ min) requires a mandatory dose adjustment [2.1].
Pregnancy Status Use during pregnancy is not generally recommended, and the drug should be used only if the potential benefit clearly outweighs the potential risk [3.1, 2.4].
Lactation Status Breastfeeding is not recommended for HIV-positive mothers due to the risk of postnatal HIV transmission and potential drug transfer to the infant [3.2].
Use Not Established Safety and efficacy have not been established in patients with significant underlying liver disease [2.1]. Specific data is also lacking for patients over 65 years of age [1.3].

The official eligibility profile for Стаг is strictly defined by absolute prohibitions and organ function constraints documented in regulatory labeling. While approved for all age groups with HIV-1, use is forbidden for those with hypersensitivity or co-administering didanosine. Eligibility is conditional on the status of the patient's renal function, and use is not established for those with significant liver disease.

What should I know about interactions with other medicines?

Concomitant use of Стаг with certain other medicines may alter the effects of either drug, potentially leading to increased adverse effects or decreased therapeutic efficacy. It is essential to inform your healthcare provider of all prescription and non-prescription medicines, vitamins, and herbal supplements you are currently taking.

Medications that may Increase Стаг Levels

Co-administration with drugs that inhibit the renal tubular secretion process of Стаг may increase its plasma concentration and the risk of associated side effects. Dose adjustment of Стаг may be necessary when taken with these medicines, such as Acyclovir.

Medications for Diabetes

When Стаг (Sitagliptin) is used with other antidiabetic agents, such as sulfonylureas (e.g., glipizide, glimepiride) or insulin, the risk of hypoglycemia (low blood sugar) may increase. Your doctor may need to lower the dose of the sulfonylurea or insulin to minimize this risk.

Other Potential Interactions

The following drug classes should be used with caution, and patients monitored for specific changes:

Interacting Drug Class Potential Effect on Стаг or Patient Clinical Action
Beta-blockers (e.g., Acebutolol) Increased hypoglycemic effect Monitor blood glucose, dose adjustment of antidiabetic drugs may be needed
Nonsteroidal Anti-inflammatory Drugs (NSAIDs) (e.g., Acetylsalicylic acid) Increased risk of hypoglycemia Monitor blood glucose closely
Alpha-2 Adrenergic Agonists (e.g., Tizanidine) Risk of CNS depression (if Стаг is Tizanidine) Close monitoring and dose adjustment

Herbal Supplements such as St. John's Wort may also interact with medication metabolism, potentially reducing drug efficacy; consult your doctor before combining any supplements with Стаг.

Mechanism of Action

How Стаг Works

The action of Стаг (Stavudine) is executed through two distinct pharmacodynamic domains: targeted enzyme inhibition for antiviral activity and off-target enzyme inhibition resulting in host cellular consequences.

Genetic Chain Termination via Reverse Transcriptase

The drug functions as a prodrug, undergoing intracellular phosphorylation by cellular kinases to form the active metabolite, stavudine triphosphate ( d4T-TP). d4T-TP acts as a competitive inhibitor of the viral enzyme HIV Reverse Transcriptase by mimicking the natural substrate. Upon incorporation into the nascent viral DNA strand, Stavudine terminates the replication chain due to the absence of the 3'-hydroxyl group on its molecular structure. This mechanism results in the suppression of the viral DNA synthesis rate, and the reduction in new viral genetic material production contributes to the maintenance of the host's CD4^+ T-lymphocyte population structure.

Off-Target Inhibition and Mitochondrial Disruption

This secondary domain arises because d4T-TP also inhibits the host enzyme Mitochondrial DNA Polymerase gamma. This off-target action compromises the replication and integrity of mitochondrial DNA in human cells. The resulting mitochondrial dysfunction impairs cellular energy production, leading to systemic consequences in high-energy tissues like nerves and the liver, which physiologically underpins the consequences observed in metabolic and neural systems.

Dosage and Administration Information

How to Use Стаг (Stavudine): Administration Guidelines

Stavudine is an antiretroviral agent administered exclusively by the oral route as part of a combination regimen for managing chronic HIV infection. The instructions for use establish standardized, weight-dependent dosing and strict adherence to a schedule.


Standard Dosing and Frequency

The standard adult dose is determined by body weight and must be administered twice daily, approximately every 12 hours. This frequency is necessary to maintain the required drug concentration in the body.

Patient Weight Standard Twice-Daily Dose
geq 60 kg 40 mg
< 60 kg 30 mg

Administration Conditions

Stavudine can be taken with or without food, allowing flexibility in the patient's daily schedule. The medication is available as both an oral capsule and an oral solution. The powder for the oral solution requires reconstitution with purified water by a pharmacist or healthcare provider before use.

Population-Specific Adjustments

Dosage adjustments are required for patients with impaired kidney function (Creatinine Clearance leq 50 mL/min). In cases of more severe renal impairment (CrCl leq 25 mL/min), the dosing frequency must be reduced to once daily to prevent excessive drug accumulation. No initial dosage adjustment is necessary for patients with hepatic impairment.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Стаг (Stavudine)

This section provides a patient-friendly overview of the official research structure for Stavudine, detailing the types of studies conducted, the outcomes measured, and where scientific uncertainty may remain. No clinical advice or recommendations are provided here.


Evidence for Use in Managing Chronic HIV-1 Infection

Research exploring the use of Stavudine has primarily utilized Randomized Controlled Trials (RCTs) and controlled cohort studies, often in the context of combination regimens for patients with chronic HIV-1 infection. These studies were applied in research contexts involving fluctuating or unstable symptoms and in patients starting therapy, as well as those who had previously used other nucleoside medicines like Zidovudine (AZT).

The main outcomes monitored in these trials were related to virological control and immunological health. Researchers monitored changes in the plasma HIV-1 RNA level (viral load) and examined the shift in CD4+ T-lymphocyte cell counts, which are outcomes related to systemic or functional imbalance. Findings describe patterns observed in studies where initial research that explored Stavudine in direct combination with Zidovudine reported findings that indicated antagonistic activity between the two drugs, contributing to the broader evidence landscape regarding drug compatibility.


Research on Perinatal Transmission Prevention

The evidence for using Stavudine involves Phase I/II clinical trials and specialized pharmacokinetic (PK) studies. These studies research examined Stavudine-containing regimens as part of strategies studied to investigate patterns related to vertical HIV transmission. This work included HIV-positive pregnant women and their newborn infants.


Research Gaps and Uncertainties in the Evidence Base

The overall research landscape has several acknowledged limitations, and certainty remains low in specific areas. Comparative evidence is lacking in large-scale trials against the newer generation of antiretroviral drugs, meaning clear comparisons across all available agents are not fully characterized. Furthermore, the long-term effects are not fully established due to limitations noted in many extended-duration studies. Follow-up durations were limited in many pivotal trials designed to establish initial efficacy.

Frequently Asked Questions (FAQ)

Common questions about Стаг (FAQ)


Q: How quickly can a person expect to feel the effects of Стаг?

A: Studies on Stavudine indicate that the medicine is rapidly absorbed into the bloodstream after it is taken by mouth, typically reaching its peak level in the blood within about one hour. The medicine’s purpose is to slow HIV replication and manage the infection, which is an effect that is measured by changes in the viral load and immune cell counts over time in clinical settings.


Q: Is the medicine Стаг taken with food or without?

A: Official administration conditions state that Stavudine can be taken with or without food. Taking the medicine at mealtime or between meals does not change the amount of the drug that your body absorbs. This condition allows for flexibility in the administration schedule.


Q: How does Стаг affect the liver?

A: Regulatory labels include serious safety warnings regarding the liver. These warnings describe the potential for developing lactic acidosis and severe hepatomegaly with steatosis (an enlarged liver with a build-up of fat), which are serious liver problems. Safety notes exist regarding the need for monitoring patients with pre-existing hepatic impairment, which is detailed in the official prescribing information.


Q: Can Стаг interact with alcohol?

A: Official product information notes that heavy alcohol use is a documented risk factor for liver problems associated with the drug. The regulatory label describes that special attention may be needed for individuals with this risk factor.


Q: What are the general expectations for someone starting Стаг?

A: The official documentation describes that the primary goals of therapy are to achieve virological control (suppression of the viral load, which is the amount of HIV in the blood) and to maintain or improve immunological health (measured by CD4+ T-lymphocyte cell counts). These outcomes are the primary measures examined in clinical research for this therapy.


Q: Can Стаг be taken with blood thinning medication?

A: Official product information emphasizes that co-administration with other medicines, including prescription and non-prescription drugs, may alter the effects of either drug. Official labeling states that providing a healthcare provider with information about all prescription and non-prescription medicines is an essential part of the drug's use conditions.


Q: Is it true that Стаг can cause changes in mood?

A: The adverse reaction profiles from clinical trials focus on effects to the Nervous System, such as peripheral neuropathy (nerve damage) and headache. The official list of common and very common side effects does not include mood changes like anxiety or depression.


Q: Is Стаг considered an antibiotic?

A: No, Stavudine is not an antibiotic. It is formally classified as an antiretroviral agent. Specifically, it belongs to the class of drugs known as Nucleoside Reverse Transcriptase Inhibitors (NRTIs), which are used to manage Human Immunodeficiency Virus (HIV) infection.


Q: How is Стаг different from other medicines that treat the same condition?

A: Stavudine is classified pharmacologically as a Nucleoside Reverse Transcriptase Inhibitor (NRTI). Other medications used in combination to manage HIV infection may belong to different pharmacological classes, such as non-nucleoside reverse transcriptase inhibitors, protease inhibitors, or integrase strand transfer inhibitors.


Q: Does Стаг cause weight gain?

A: The regulatory label documents lipoatrophy (a decrease in fat under the skin), which is associated with long-term exposure to the medicine. While weight loss has been reported as a side effect, weight gain is not explicitly listed among the adverse reactions in the official tables.


Q: Can Стаг affect sleep?

A: Adverse reaction profiles developed from clinical trial data list insomnia (difficulty sleeping) as a reported side effect of Stavudine. This indicates that the medicine may affect a patient’s ability to fall asleep or stay asleep.


Q: Is Стаг a type of steroid?

A: No, Stavudine is not a steroid. It is classified as an antiretroviral agent that is a synthetic thymidine nucleoside analogue, which is a chemically manufactured compound designed to interfere with viral replication.


Q: How long does Стаг stay in the body?

A: Pharmacokinetic data describes the mean elimination half-life of Stavudine in adults as approximately 1.6 hours after an oral dose. This time indicates how quickly the concentration of the drug is reduced by half in the bloodstream. The half-life may be longer in patients who have impaired kidney function.


Q: Is Стаг approved for use in children?

A: Yes, official eligibility documents state that Stavudine is established for the treatment of HIV-1 infection in both adults and pediatric patients. The liquid oral solution form is often used to ensure appropriate administration in children.


Q: Is it possible to become dependent on Стаг?

A: Official regulatory documents related to Stavudine do not classify it as a controlled substance, and the labeling does not contain specific warnings regarding the risk of physical dependence or abuse.


Q: Is the long-term use of Стаг studied?

A: Research has been conducted on the use of Stavudine in chronic HIV infection. However, official documents note that the long-term effects are not fully established and that the incidence and severity of certain side effects, such as peripheral neuropathy, are documented as being cumulative over time.


Q: Does the time of day matter when taking Стаг?

A: The administration guidelines describe the need for the medicine to be administered twice a day, at approximately every 12 hours. Official drug information describes the importance of taking the medicine at around the same times each day to support consistent drug concentration.


Q: Can Стаг cause skin rashes or allergic reactions?

A: Yes, rash is listed as a common side effect in the official safety profile. Furthermore, the use of the drug is contraindicated (absolutely forbidden) in patients with a known hypersensitivity (severe allergic reaction) to Stavudine.


Q: Are there different brand names for the medicine Стаг?

A: Yes, the active ingredient Stavudine, referred to here as Стаг, is marketed by pharmaceutical companies under other trade names, such as ZERIT.


Q: Is Стаг available over the counter?

A: Stavudine is an antiretroviral agent used for managing HIV-1 infection and requires a prescription from a healthcare provider. It is not available for purchase without a prescription.


Q: Can elderly patients use Стаг?

A: The official eligibility profile notes that specific data is lacking for patients over 65 years of age. Regulatory guidance describes that dosage adjustment is required for patients with impaired kidney function, which may be relevant for older patients.


Q: Is a follow-up required after starting Стаг?

A: Regulatory documents recommend that healthcare providers perform monitoring after a patient starts this medicine. This monitoring typically involves checking for serious complications like lactic acidosis and continually observing for signs of peripheral neuropathy.


Q: Is there a link between Стаг and eye problems?

A: Official warnings and precautions in the regulatory label include reports of some patients experiencing retinal changes and optic neuritis (inflammation of the nerve that connects the eye to the brain).


Q: Do studies show that Стаг is better absorbed when taken in a certain way?

A: Pharmacokinetic studies have shown that the capsule and oral solution forms are bioequivalent, meaning they deliver the same amount of medicine into the bloodstream. Additionally, taking the drug with or without food does not change its absorption.


Q: Is Стаг known to cause stomach upset?

A: Side effects frequently involve the Gastrointestinal System. Official adverse reaction profiles list common or very common issues such as diarrhea, nausea, vomiting, and abdominal pain.


Q: Why is laboratory monitoring sometimes needed when taking Стаг?

A: Laboratory monitoring is recommended by official guidelines to detect and manage potentially serious adverse reactions. This includes regular testing for conditions like lactic acidosis and checking immune markers like CD4+ cell counts.


Q: Is it normal to feel a mild tingling sensation after taking Стаг?

A: Peripheral neuropathy (nerve damage) is listed as a very common adverse reaction in the product information. This condition can cause symptoms such as tingling, numbness, burning, or pain in the arms, hands, legs, or feet.


Q: How is the safety of Стаг monitored after it's approved?

A: The safety of the medicine continues to be monitored through regulatory systems and post-marketing surveillance. Healthcare professionals and patients are encouraged to report any suspected adverse reactions to the relevant regulatory agencies to ensure the ongoing collection of safety data.


Q: Does Стаг interact with vitamin supplements?

A: Official labeling describes that providing a healthcare provider with information about all prescription and non-prescription medicines, vitamins, and herbal supplements is necessary. This is due to the potential for these combinations to alter the effects of Stavudine or the supplement.


How should Стаг be stored and disposed of?

How to Store and Dispose of Стаг (Stavudine)

The storage requirements for Стаг (Stavudine) vary by formulation and must strictly follow regulatory guidance to ensure product stability.


Storage Conditions

Formulation Required Storage Condition Specific Constraints
Oral Capsules Controlled room temperature (15 C to 30 C) Keep in a tightly closed container, protected from moisture and light .
Oral Solution Refrigerated (2 C to 8 C) Do not freeze. Must be discarded 30 days after constitution .

All forms must be kept out of the reach of children and pets .


Disposal

Unused or expired Stavudine should be discarded using a community medicine take-back program . If a program is unavailable, the medicine may be mixed with an unpalatable substance and sealed in a plastic bag for disposal in the household trash . The medicine must not be flushed down the toilet or poured into a drain.

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

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