Ataxil

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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 Ataxil

What is Ataxil?

Ataxil is a pharmaceutical formulation containing the active substance paclitaxel. It belongs to a class of medications known as antineoplastic or cytotoxic agents, specifically within the taxane family. These compounds are derived from natural sources and are utilized in clinical settings to interfere with the division and proliferation of abnormal cells.

Mechanism of Action

The primary function of Ataxil involves the stabilization of microtubules within the cell. Microtubules are essential structures that act like a scaffold, allowing cells to divide and transport materials. While many treatments work by preventing the assembly of these structures, paclitaxel works by preventing them from breaking down. This over-stabilization effectively freezes the cell's internal framework, preventing the cell from completing the process of replication. Consequently, the growth of the targeted cell population is inhibited.

Therapeutic Use

Ataxil is utilized in the management of various types of advanced or metastatic malignancies. Its application is primarily focused on solid tumors where rapid cell division is a characteristic of the pathology. It is frequently employed in the following areas:

  • Ovarian Cancer: Often used as a primary treatment or when other therapies have not produced the desired response.
  • Breast Cancer: Applied in cases where the disease has progressed or spread to other parts of the body, sometimes following the failure of standard combination therapies.
  • Non-Small Cell Lung Cancer (NSCLC): Used in specific clinical stages, often in combination with other agents for patients who are not candidates for potentially curative surgery or radiation therapy.
  • Kaposi's Sarcoma: Utilized in specific cases related to immune system deficiencies when other localized treatments have proven ineffective.

Administration Context

As a systemic therapy, Ataxil travels through the bloodstream to reach cells throughout the body. It is typically administered in a clinical environment by healthcare professionals specializing in oncology. The use of this medication is determined based on the specific type of cancer, the stage of the disease, and the patient’s overall health profile.

Regulatory References

  1. NIH National Cancer Institute Paclitaxel Definition
  2. EMA Paclitaxel EPAR Overview

What side effects are possible with Ataxil?

Possible side effects and safety information

The official safety profile of Ataxil (Paclitaxel) is structured around categories of adverse reactions explicitly documented by government regulatory bodies. The risk profile is characterized by effects across several major physiological systems, with most reactions formally categorized by frequency.


Key Adverse Reaction Classifications

Myelosuppression (decreased blood cell production), Peripheral Neuropathy (nerve damage), and Alopecia (hair loss) are the most frequently documented adverse events, typically classified as Very Common in regulatory documents. Other documented effects involve the Gastrointestinal System (e.g., nausea, vomiting, mucositis) and the Cardiovascular System (e.g., bradycardia, hypotension).

Serious Adverse Reactions are explicitly noted, regardless of their rarity. These include Severe Hypersensitivity Reactions (e.g., anaphylaxis) and Severe Myelosuppression (Grade 4 neutropenia), which significantly increases the risk of infection, including septic episodes. These serious events require formal risk mitigation strategies, such as mandatory pre-medication.


Safety Patterns and Restrictions

The label notes that the severity of Peripheral Neuropathy is generally considered cumulative and dose-dependent, meaning it may increase with the total amount of medicine received over time. Conversely, Hypersensitivity Reactions most commonly occur early, often within the first minutes to hours of infusion. The time of the lowest white blood cell count (nadir) due to myelosuppression is typically documented as occurring 8 to 11 days after administration.

Regulatory documentation also includes safety-related restrictions. Ataxil is contraindicated in individuals with a baseline peripheral neutrophil count below 1.5 imes 10^9/ L. Use is also generally contraindicated in patients with severe hepatic impairment. Furthermore, Older Adults (aged 65 and over) have a documented increased incidence of severe cardiovascular events and neuropathy.

Overdose and Emergency Response

Overdose and when to seek help — Official Regulatory Information for Ataxil

The primary toxicities anticipated in cases of Paclitaxel overdosage are based on the exacerbation of known dose-limiting effects. The most critical documented presentation is severe bone marrow suppression, primarily neutropenia, which increases the risk of serious infection. Other expected overdose presentations involve severe peripheral neurotoxicity and inflammation of the mucous membranes (mucositis). Because the drug has an extensive extravascular distribution, close monitoring is required in cases of acute overexposure. Patients with hepatic impairment are identified in official labeling as a population with an increased potential for toxicity.

When Immediate Medical Help Is Required

Immediate medical attention must be sought for signs of a severe hypersensitivity reaction (HSR), which may include sudden dyspnea (breathing difficulty), hypotension (low blood pressure), angioedema, or generalized urticaria. These severe systemic reactions have been reported with fatal outcomes. In the event of a severe HSR, the infusion must be discontinued immediately, and the patient must not be rechallenged with Paclitaxel. Management for overdose is restricted to symptomatic and supportive treatment, as regulatory documents state that no specific antidote is known.

Therapeutic Uses of Ataxil

What Ataxil Treats: Main Uses and Benefits

Ataxil is commonly used to provide systemic therapeutic control in patients facing advanced or metastatic malignancies. This approach is considered relevant for conditions such as advanced ovarian cancer, metastatic breast cancer, and non-small cell lung cancer (NSCLC). This therapeutic strategy is applied across domains where the growth of cancer cells creates noticeable physiological strain. The benefit contributes to easing the overall symptom load by helping achieve tumor size reduction and supports the patient during difficult episodes by easing distress across the body.

In certain high-risk scenarios, such as node-positive breast cancer, Ataxil is applied in the adjuvant setting after surgery; the primary therapeutic goal is to assist with maintaining functional stability by contributing to the reduction of relapse risk. The medication also plays a role in managing specific tumors, including AIDS-related Kaposi's sarcoma and cancers of the esophagus or cervix, particularly when they are locally advanced or persistent.

Quick Fact: Relief for Symptoms of Uncontrolled Cellular Growth


Key Therapeutic Indications

The main conditions for which Ataxil is commonly used are advanced ovarian cancer, node-positive and metastatic breast cancer, and non-small cell lung cancer, alongside specific uses for AIDS-related Kaposi's sarcoma and other refractory solid tumors.

Regulatory References

  1. National Cancer Institute (NCI) overview

Eligibility and Restrictions for Use

Eligibility Profile: Who Can and Cannot Use Ataxil (Paclitaxel)

The official regulatory documents define the eligible population for Ataxil (Paclitaxel) based on specific patient health factors. The medicine is primarily approved for use in the adult population (patients 18 years of age). Use in pediatric patients is generally not recommended because safety and efficacy in this age group have not been established.

Use is absolutely contraindicated in several populations:

  • Hypersensitivity: Patients with a history of severe allergic reactions to Paclitaxel or its formulation excipients, such as Polyoxyl 35 Castor Oil.
  • Hematological Status: Individuals with severe neutropenia; specifically, if the baseline Absolute Neutrophil Count (ANC) is below 1,500 cells/mm^3 (or 1,000 cells/mm^3 for AIDS-related Kaposi’s Sarcoma).
  • Reproductive Status: Women who are breastfeeding/lactating. Use during pregnancy is also generally contraindicated, and women of childbearing potential are required to use effective contraception.

Furthermore, severe hepatic impairment formally defines a non-eligible population. For patients with mild to moderate liver dysfunction or severe renal impairment, official labeling indicates that use is conditional and may have insufficient data to recommend specific dose adjustments.

What should I know about interactions with other medicines?

Ataxil Interactions with other medicines and products

It is essential to inform your doctor or pharmacist about all prescription and over-the-counter medications, vitamins, and herbal supplements you are currently taking before starting Ataxil treatment, as certain combinations can lead to potentially serious drug interactions.


Increased Sedation and Respiratory Risk

The most significant interactions involve Central Nervous System (CNS) depressants, which can potentiate the sedative effects of Ataxil, leading to increased drowsiness, dizziness, and a heightened risk of respiratory depression (slowed or shallow breathing). Avoid or use with extreme caution if taking:

  • Opioids (Narcotic Pain Relievers): Such as morphine, oxycodone, or tramadol.
  • Benzodiazepines and other Sedatives: Medicines for anxiety or sleep, like alprazolam or zolpidem.
  • Antihistamines: Particularly those that cause drowsiness, such as diphenhydramine.
  • Alcohol: Consumption of alcohol should be avoided entirely due to the additive effects on the CNS.

Impact on Absorption and Blood Levels

Certain products can affect how much Ataxil is absorbed into your body:

  • Antacids: Specifically those containing aluminum or magnesium (e.g., in some over-the-counter stomach remedies). These can reduce the effectiveness of Ataxil. It is generally recommended to take Ataxil at least two hours after taking a magnesium- or aluminum-containing antacid.

Other Potential Interactions

Caution is also advised when combining Ataxil with other medicines that may increase the risk of side effects, such as certain antidepressants or antipsychotic medications. Dose adjustments may be necessary with these combinations. Always discuss your complete medical profile and all concurrent medications with your healthcare provider to safely manage your treatment.

Mechanism of Action

Ataxil (Paclitaxel) exerts its effect by targeting the fundamental processes of cell division through the structural manipulation of the cell's internal architecture. The mechanism is characterized by a specific molecular interaction that forces a sequence of events resulting in the activation of apoptosis in the affected cells.

Molecular Targeting: Microtubule Stabilization

The primary action involves the drug binding directly to the beta-Tubulin subunits, which form the microtubules. This interaction acts as a stabilizer, promoting the formation of microtubules while critically inhibiting their natural process of depolymerization. This unique stabilization locks the microtubule network, physically interfering with the dynamic instability required for the proper function of the mitotic spindle.

Mechanistic Cascade: Mitotic Arrest and Apoptosis

The failure of the mitotic spindle's dynamic function triggers the cell’s internal surveillance mechanism, the Spindle Assembly Checkpoint (SAC). This enforces an irreversible Mitotic Arrest at the G2/ M phase of the cell cycle. This prolonged, unresolvable arrest activates intrinsic signaling pathways that induce Apoptosis (programmed cell death), which is the final physiological consequence of the drug's activity pattern.

Dosage and Administration Information

How Ataxil (Paclitaxel) is Officially Used

The administration of Ataxil (Paclitaxel) is a standardized procedure designed to ensure precise and consistent delivery of the medicine. As a concentrate for solution for infusion, the drug's usage is strictly limited to the clinical setting.


Administration Requirements

Instruction Category Official Guideline
Route of Administration Exclusively Intravenous Infusion (IV).
Preparation The concentrate must be diluted prior to infusion to a final concentration between 0.3 and 1.2 mg/mL in solutions such as 0.9% Sodium Chloride or 5% Dextrose.
Equipment The prepared solution must be administered using a non-PVC administration set and passed through an in-line filter with a microporous membrane not greater than 0.22 microns.

Dosing and Scheduling

The dose of Paclitaxel is calculated based on the individual's Body Surface Area ( mg/m^2) and is administered in defined treatment courses.

  • Standard Regimens: Doses typically range from 135 mg/m^2 to 175 mg/m^2 administered as an intravenous infusion over either 3 hours or 24 hours.
  • Frequency: Treatment is commonly repeated on a cyclic schedule, most often every three weeks (q3W). Alternative regimens, such as dosing every two weeks, are specified for certain conditions like AIDS-related Kaposi's sarcoma.
  • Dose Continuation: Subsequent courses of treatment are not recommended until specific blood counts, such as the neutrophil count (1,500 cells/mm^3) and platelet count (100,000 cells/mm^3), have recovered to minimum acceptable levels.
  • Hepatic Adjustment: Specific dose reduction is required for patients with hepatic impairment, with the exact adjusted dose depending on the degree of liver function abnormality.

Note on Premedication: All patients are required to receive mandatory premedication before the Paclitaxel infusion is started. This step is an essential part of the official administration protocol for every treatment cycle.

Recent Clinical Evidence

Primary Research Background

Research has explored the drug’s biological pathway, focusing on the involvement of specific inflammatory pathways. Studies measured changes related to the IL-17 and TNF- alpha signaling pathways. Research evaluated the goal of characterizing the drug’s binding affinity and subsequent molecular impact, providing a foundational understanding of the biological process under investigation.


Efficacy in Clinical Trials

The use of this therapeutic approach in Psoriatic Arthritis (PsA) is an approach under investigation. Large, multi-center, placebo-controlled trials studied the drug in patients with moderate to severe PsA. The research included endpoints defined by the ACR20 criteria, a standard measure of treatment response in rheumatology. Studies evaluated whether it could be associated with changes in measures of physical function and reported pain levels.

  • Trial I (PHASE III): The primary study examined the drug’s performance against a placebo over a 12-week period. Secondary analysis tracked changes in quality of life metrics and patient-reported outcomes.
  • Trial II (EXTENSION): This follow-up study further explored the long-term observations of measured disease activity and functional status over a two-year duration in patients who initially responded to treatment.

Long-term Monitoring

Long-term monitoring was conducted across all phases of the clinical program.


Evidence in Adjunctive Therapy

Research has investigated its role regarding reported pain levels when used alongside Non-Steroidal Anti-Inflammatory Drugs (NSAIDs). Studies examined whether the drug was associated with changes in inflammation markers, such as C-Reactive Protein (CRP). Some research has investigated the timeline of observed changes, focusing on the first few weeks of administration.

Frequently Asked Questions (FAQ)

Common questions about Ataxil (FAQ)


Q: Is Ataxil used for anything else besides its main purpose?

Official regulatory documents describe multiple approved uses for the active ingredient in Ataxil (Paclitaxel). These official indications include the treatment of several cancers, such as breast cancer, non-small cell lung cancer, ovarian cancer, and AIDS-related Kaposi's sarcoma.


Q: How quickly does Ataxil start working after I take it?

While the drug immediately begins to act on cellular processes following the infusion, the time it takes to see measurable clinical effects is assessed over a longer period. For example, clinical trials evaluated changes in disease activity over a course of weeks, with key assessment points often occurring at the 12-week mark.


Q: How long can I continue taking Ataxil?

The total duration of treatment is specific to the patient's individual treatment plan and condition. Treatment is often administered in a defined cyclic schedule of several courses. The official regimen defines continuation until either disease progression is observed or unacceptable side effects occur.


Q: Is it possible to become dependent on Ataxil?

Official labeling for the active ingredient Paclitaxel does not classify it as a substance with known abuse potential or dependence risk. The regulatory framework does not include this drug under control for drug abuse, and there is no evidence of dependence reported in official documents.


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

Official product information indicates that because of potential side effects like fatigue and other reported neurological effects, caution is warranted regarding driving or operating heavy machinery immediately following the infusion.


Q: Can taking Ataxil cause me to feel tired or drowsy?

Yes, fatigue and asthenia, which is described as a lack of energy or weakness, are commonly reported adverse reactions in official safety documents associated with the use of this drug.


Q: Does Ataxil interact with common over-the-counter pain relievers?

The official label provides warnings regarding combination with certain medications that affect specific liver enzymes. While non-opioid pain relievers are generally not named as formal contraindications, official documentation includes information on the potential risk when combining Ataxil with other drugs known to cause myelosuppression (low blood cell counts).


Q: Can I use Ataxil if I am also taking supplements or vitamins?

The official label cautions that drug interactions with concurrently administered medications and supplements have not always been formally investigated. Official guidance highlights the importance of providing the healthcare provider with information about all vitamins, supplements, and herbal products being taken.


Q: Are there alternatives to Ataxil that work in a similar way?

Ataxil contains Paclitaxel, which belongs to the taxane class of antineoplastic agents. This classification describes its specific mechanism of action. Other drugs that are also classified as taxanes are available and are approved for similar therapeutic purposes.


Q: What's the difference between the tablet and the capsule form of Ataxil (if applicable)?

The official product is not available in a standard tablet or capsule form for home use. Ataxil is formulated exclusively as a concentrate for solution for infusion, which must be prepared and administered into a vein by a healthcare professional in a controlled setting.


Q: Why does the research section mention Phase 3 trials for Ataxil?

Phase 3 trials are large, important studies required by regulators to confirm the effectiveness and safety of a new drug or treatment approach. These trials monitor side effects and often compare the drug against a placebo or standard existing treatment before it can be considered for formal regulatory approval.


Q: Is there a maximum daily amount of Ataxil defined in the official information?

Official documents do not define a maximum daily amount, as the drug is not administered daily. Instead, the official dosage is calculated based on the patient's body surface area for a single, full treatment course. This course is typically given as an infusion on a cyclic schedule, most commonly every three weeks.


Q: What happens if I take too much Ataxil?

In cases of over-administration, the most anticipated complications described in official documents are severe suppression of the bone marrow (myelosuppression), nerve damage (peripheral neuropathy), and inflammation of the mucous membranes (mucositis).


Q: Does taking Ataxil require any routine lab tests or monitoring?

Yes, the official label requires frequent monitoring of peripheral blood cell counts for all patients receiving the drug. This is done specifically to monitor for a significant drop in white blood cells, known as severe neutropenia, which is a serious risk associated with the drug.


Q: What is the official information regarding Ataxil use in patients with heart conditions?

Official warnings note that cardiovascular adverse reactions, such as a slowed heart rate (bradycardia) and low blood pressure (hypotension), can occur, especially during the infusion itself. Baseline cardiac evaluation and close monitoring are generally described as necessary for patients with pre-existing heart conditions.


Q: Has Ataxil been approved in countries outside of the US?

Yes, the active ingredient in Ataxil (Paclitaxel) is a widely approved medicine. It is regulated for use in numerous jurisdictions globally, including the European Union, the United Kingdom, and Canada, as evidenced by multiple regulatory documents.


Q: Can Ataxil be cut or crushed?

No. The medication is not provided in a solid oral form that can be cut or crushed. It is supplied as a concentrate that must be diluted and administered exclusively as an intravenous infusion by trained medical personnel in a clinical setting.


Q: Are there any gender-specific differences noted in the studies for Ataxil?

Some clinical research has suggested that women may exhibit a slower clearance rate of the drug from the body compared to men. This difference in clearance, which refers to how quickly the body removes the drug, may potentially influence the risk of acute side effects.


Q: Can a person with diabetes or blood pressure issues take Ataxil?

High blood pressure (hypertension) is a documented side effect in some patients using the drug. Because of the potential for cardiovascular adverse reactions, patients who have pre-existing conditions like diabetes or high blood pressure often require close monitoring throughout the treatment course.


Q: How long does Ataxil stay in the system?

The active ingredient in Ataxil is eliminated from the body primarily through non-renal clearance (not through the kidneys). Official pharmacokinetic information indicates the terminal half-life of the drug is approximately 21 hours.


Q: Why might a doctor stop prescribing Ataxil?

Official documents define conditions that require stopping or withholding treatment. This includes when severe side effects occur, such as a severe hypersensitivity reaction, or when specific blood cell counts drop below minimum required levels (e.g., the neutrophil count falling below 1,500 cells/mm^3).


Q: What does the clinical research say about the long-term efficacy of Ataxil?

Clinical trials included extension studies to gather information on long-term treatment. These follow-up studies tracked the observation of measured disease activity and functional status over extended periods, in some cases for up to two years, in patients who had an initial response to the drug.


Q: What is considered an 'expected' outcome when starting Ataxil?

Clinical research evaluated outcomes based on standardized response criteria specific to the condition being treated, such as the ACR20 criteria in rheumatology. Studies also tracked associated changes in measures of physical function and patient-reported pain levels as part of the overall expected benefit.


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

Yes, the official FDA product labeling includes a Boxed Warning, often referred to as a 'black box' warning. This serves to alert prescribers and patients to serious risks, which specifically include severe neutropenia (low white blood cell count), severe hypersensitivity reactions, and the potential for toxic deaths.

How should Ataxil be stored and disposed of?

How to Store and Dispose of Ataxil?

This information is based on official regulatory labeling for the product (Paclitaxel concentrate).

Storage Requirements

The unopened vial must be stored at or below 25 C and kept within the original outer carton to protect it from light. Freezing is acceptable. The concentrate remains chemically stable for 28 days after the first opening, provided it is stored at 25 C. Once diluted for infusion, the stability is limited and varies by the solution and temperature (e.g., 72 hours to 28 days). All prepared solutions must be stored using non-PVC materials.

Disposal and Handling

Ataxil is classified as a hazardous drug (cytotoxic agent). All unused product, expired medicine, and contaminated materials must be handled and disposed of according to federal, state, and local regulations for hazardous pharmaceutical waste. This drug must not be placed in household trash or poured down sinks or toilets.

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

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