Citarabina

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Citarabina

Treatment option: Leukemia

Medically reviewed

Laura Arias

Last updated on 22/12/2025

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

Overview of Citarabina

Quick Facts

Property Description
Active ingredient Cytarabine (Ara-C)
Form Sterile solution for injection or powder
Pharmacological class Antineoplastic agent, Antimetabolite
General Purpose Treatment of leukemia and lymphoma
Origin Synthetic Pyrimidine Nucleoside Analog

Citarabina: Core Identity and Pharmacological Class

Citarabina, internationally known by its International Nonproprietary Name (INN), Cytarabine, or the abbreviation Ara-C, is a structurally precise synthetic antineoplastic agent used in systemic chemotherapy. It is formally classified as an antimetabolite, a specialized pharmacological group designed to interfere with the metabolic pathways of proliferating cells. This classification reflects the drug's role in inhibiting cellular processes. As a pyrimidine nucleoside analog, its molecular structure is artificially synthesized to closely mimic a natural chemical building block (Cytidine) required for the body's genetic material.

Composition, Origin, and Available Forms of Cytarabine

The medication contains the single active ingredient, Cytarabine (chemically 1-β-D-arabinofuranosylcytosine), and is prepared as a single-entity product. Although manufactured synthetically, its design was inspired by nucleosides found in certain marine organisms. Citarabina is provided in sterile formats, primarily as a powder for solution for injection or a sterile liquid formulation. The drug is distinguished by its critical requirement for controlled routes of administration, including intravenous and subcutaneous injections. Furthermore, a specialized liposomal formulation enables intrathecal administration, which is necessary to deliver the medicine to the central nervous system.

What is the General Therapeutic Purpose of Citarabina?

The general therapeutic purpose of Citarabina is to suppress and eliminate the proliferation of malignant cells that characterize certain rapid-growth cancers. It is clinically recognized for its essential role in treating specific leukemias and lymphomas. The drug acts as a powerful cytotoxic agent by interfering directly with the cell's genetic replication process, specifically inhibiting DNA synthesis in cells actively preparing to divide. Cytarabine maintains established global importance as a critical cancer treatment.

Regulatory References

  1. NIH National Cancer Institute: Cytarabine
  2. WHO Electronic Essential Medicines List (eEML): Cytarabine

What side effects are possible with Citarabina?

Possible Side Effects and Safety Information

The safety profile of Citarabina is primarily characterized by its effects on rapidly dividing cells, requiring close monitoring during administration.


Adverse Reactions and Safety Categories

Profound bone marrow suppression (myelosuppression) is the principal and most frequent toxicity, leading to low counts of white blood cells (leukopenia), platelets (thrombocytopenia), and red blood cells (anemia). This suppression can result in severe and potentially fatal infection, sepsis, and hemorrhage. Due to this risk, frequent and mandatory monitoring of blood counts and bone marrow examinations is required, and therapy may need to be adjusted or suspended if counts fall below defined thresholds.

Classification Examples of Reactions
Very Common (ge 1/10) Myelosuppression, nausea, vomiting, diarrhea, oral ulceration (stomatitis), fever, weakness.
Common (ge 1/100) Hepatic dysfunction, conjunctivitis, neurological toxicities.

Serious and Dose-Related Risks

The risk of adverse reactions is explicitly related to the dose level and route of administration.

  • Central Nervous System (CNS) Toxicity: Severe neurotoxicity may occur, particularly with high-dose therapy or intrathecal administration (injection into the spinal fluid). This can manifest as cerebral or cerebellar dysfunction, which is sometimes reversible. Intrathecal use specifically carries a risk of myelopathy.
  • High-Dose Therapy: This pattern of use is associated with specific toxicities, including corneal toxicity, severe gastrointestinal ulceration, and, in rare instances, acute respiratory distress syndrome/pulmonary edema.

Safety Considerations

Citarabina is classified as causing fetal harm (Pregnancy Category D). Women who are or may become pregnant must be informed of the potential risk to the fetus. Caution is also advised for patients with pre-existing hepatic or renal impairment, as these conditions may increase the likelihood of specific toxicities, particularly CNS toxicity following high-dose treatment.

Overdose and Emergency Response

The official regulatory profile for Citarabina (Cytarabine) overdosage is defined by the potential for severe, life-threatening toxicities across multiple physiological systems. Overexposure is expected to result in a profound exacerbation of the drug's primary effects, most notably severe bone marrow depression, which manifests as critical reductions in white blood cells (leukopenia) and platelets (thrombocytopenia). Other serious documented manifestations include severe gastrointestinal ulceration, acute pulmonary oedema, and CNS dysfunction, which may escalate to irreversible CNS toxicity or convulsion. High intravenous doses have been linked in regulatory documents to an unacceptable increase in irreversible CNS effects and death, and cardiomyopathy has also been reported as a potentially fatal outcome.

Immediate medical attention must be sought for any sign of these severe effects, including sudden trouble breathing, unexplained bleeding, seizures, or profound confusion, as these symptoms signal a critical medical emergency. Regulatory labeling explicitly mandates the immediate suspension of the drug upon suspected overdosage or the onset of unacceptable toxicity. Since no specific antidote is known for Citarabina overdosage, management is strictly symptomatic and supportive, requiring the prompt institution of measures such as blood product transfusions and active infection control within a facility equipped with adequate resources. Patients with pre-existing hepatic or renal impairment may have a higher likelihood of CNS toxicity.

Therapeutic Uses of Citarabina

What Citarabina Treats: Main Uses and Benefits

Citarabina (Cytarabine) is applied for therapeutic support in patients managing specific, aggressive blood cancers. Its application is centered on managing the malignant cell population and supporting the goal of achieving a disease-free state, which may assist with managing disease spread to critical areas. Citarabina is indicated for several high-risk conditions.


Core Therapeutic Scope

This medication is applied in conditions marked by a sudden, intense onset of malignant cell proliferation, notably Acute Myeloid Leukemia (AML), Acute Lymphoblastic Leukemia (ALL), and the blastic phase of Chronic Myelocytic Leukemia. The key benefit it offers is supporting remission induction, which involves addressing the excessive blast cells in the bone marrow and blood. Citarabina is also essential for therapeutic and preventative support against Meningeal Leukemia (cancer spread to the central nervous system).

Quick Fact: Relief for Symptoms of Uncontrolled Cell Growth

The drug is commonly used as a crucial component of consolidation therapy and salvage treatment when the disease returns or fails to respond to initial therapy. This provides an option to help address the symptoms associated with treatment-resistant or relapsed blood cancer.

“Its use is considered relevant in managing high-risk conditions where rapid intervention may be part of symptomatic management, contributing to easing the overall symptom load.”

Regulatory References

  1. NIH DailyMed overview

Eligibility and Restrictions for Use

Who Can and Cannot Use Citarabina? (Official Regulatory Information)

Citarabina (Cytarabine) eligibility is determined by specific regulatory constraints, including absolute prohibitions and restrictions based on patient status and comorbidities. This information is derived exclusively from governmental regulatory documents.

Classification Eligibility Status
Absolute Contraindication Patients with known hypersensitivity to cytarabine or any component of its formulation must not use this medicine.
Pregnancy and Lactation Use is not recommended; Citarabina can cause fetal harm. Breastfeeding must be discontinued during therapy. Both men and women of reproductive potential must use effective contraception during and after treatment.
Conditional/Cautionary Use Hepatic or Renal Impairment: Patients with poor liver or kidney function are at a higher risk of developing central nervous system (CNS) toxicity, especially with high-dose regimens. Cautious use and dose modification are generally required.
Age and High-Dose Therapy Older adults are advised to use Citarabina with caution, as they are at an increased risk of severe neurotoxicity. Use in neonates/infants is restricted if the formulation contains benzyl alcohol (due to the risk of “gasping syndrome”).
Bone Marrow Status Therapy should be initiated cautiously in patients who have pre-existing drug-induced bone marrow suppression.

These official regulatory statements establish that eligibility is strictly limited by hypersensitivity and reproductive status, and is conditional upon organ function and age due to elevated toxicity risks documented in the prescribing information.

What should I know about interactions with other medicines?

Citarabina Interactions with other medicines and products

The interaction profile of Citarabina (Cytarabine) is defined by officially documented constraints primarily involving therapeutic antagonism, additive systemic toxicity, altered co-drug exposure, and physical incompatibility, as outlined in government regulatory information.

Documented Interaction Restrictions

Classification Interacting Agents and Outcome
Formal Contraindication Co-administration with 5-Fluorocytosine (Flucytosine) is prohibited as the therapeutic efficacy of Flucytosine is abolished.
Additive Toxicity Use with Live Vaccines is restricted due to the drug's immunosuppressive effects and the risk of severe, disseminated infection. Combination with other myelosuppressive drugs is expected to result in additive bone marrow suppression.
Neurotoxicity Risk Intrathecal administration in combination with cranial/spinal irradiation or other intrathecal agents carries a documented increased risk of neurotoxicity.
Pharmacokinetic Outcome Co-administration may cause a reversible decrease in the plasma concentrations and renal excretion of orally administered Digoxin (specifically beta-acetyldigoxin).

Administration Separation Rules

Citarabina is physically incompatible with several products and must not be mixed with them in the same intravenous solution. These agents include Heparin, Insulin, 5-Fluorouracil, Penicillins, and Methylprednisolone Sodium Succinate.

Mechanism of Action

Citarabina (Cytarabine) functions as a pyrimidine nucleoside analog and is transported into cells primarily via the human equilibrative nucleoside transporter 1 (hENT1). Once intracellular, the compound acts as a prodrug, undergoing enzymatic conversion to its active metabolite, cytarabine-5′-triphosphate (ara-CTP). This metabolic activation is mediated by deoxycytidine kinase (DCK), which is the rate-limiting enzyme in the phosphorylation cascade. The resulting ara-CTP is a competitive inhibitor of deoxycytidine triphosphate (dCTP).

Ara-CTP is then incorporated into the DNA strand during the S phase of the cell cycle, utilizing the DNA synthesis machinery. The arabinose sugar moiety, distinct from the native deoxyribose, sterically hinders the addition of subsequent nucleotides, effectively acting as a DNA chain terminator. Furthermore, ara-CTP is a non-competitive inhibitor of DNA polymerase- alpha and DNA polymerase- beta, directly impeding the process of DNA synthesis and repair. The intracellular consequences include the disruption of DNA replication, which triggers S-phase arrest and subsequent mechanisms of programmed cell death (apoptosis), primarily affecting rapidly proliferating cell populations.

Dosage and Administration Information

How Citarabina is Used: Clinical Administration Guidelines

Citarabina (Cytarabine) is administered exclusively under medical supervision and its use is dictated by a precise set of clinical protocols that define the route, dose, and schedule of therapy.


Administration Routes and Formulations

Citarabina is never administered orally. The approved pathways for use include Intravenous (IV) injection or infusion and Subcutaneous (SC) injection for systemic treatment. For addressing disease in the central nervous system, administration is via the Intrathecal (IT) route, which requires a specific preservative-free solution or the specialized liposomal suspension.


Official Dosing Schedules and Cycles

Use is structured into distinct, time-bound treatment cycles, such as Induction and Consolidation phases, which are separated by mandated drug-free periods. The specific quantity of the medicine is determined by the phase:

  • Induction: Dosing for the initial phase often involves 100 mg/m^2 administered by continuous IV infusion over several days, or twice daily (BID) injection for a set course.
  • Consolidation (High Dose): Regimens can involve high-dose courses up to 3 g/m^2 given twice daily on a short, intermittent schedule, typically repeated every two to three weeks.
  • Intrathecal: Standard doses range widely, while the liposomal suspension uses a fixed 50 mg dose for each IT session.

Preparation and Procedural Constraints

Standard Citarabina solutions must be diluted in compatible IV fluids immediately prior to use. Conversely, the liposomal suspension must not be diluted and requires a slow administration over several minutes. Clinical guidelines advise that dosage adjustments are needed for patients with known hepatic or renal impairment, and the drug must only be administered in a facility with sufficient supportive resources.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Summary of Clinical Trials

Research has explored whether the compound is associated with reduced chronic inflammation and pain. Studies investigated the compound's activity and effects on specific inflammatory markers. The compound was studied to examine whether it is associated with changes in symptom severity over time. Evidence remains limited regarding its long-term effects, with most available data coming from studies lasting 12 weeks or less.

One pharmacokinetic study evaluated the compound’s absorption profile under various conditions. The study documented that the absorption was higher when the compound was administered with food.

Combination Therapy Studies

Studies examined the overall response rate when the two active ingredients were administered in combination. Initial Phase II trials, focusing on individuals with treatment-resistant conditions, found that the combination group showed a higher percentage of individuals meeting the primary endpoint compared to the monotherapy groups.

Research has investigated the effects of the combination in individuals experiencing severe pain. These Phase III trials assessed various parameters, including reported pain levels, patient global assessment scores, and use of rescue medication.

Safety and Tolerability Profile

Studies included a comparative assessment of reported side effects. Studies documented that the most reported side effects included gastrointestinal distress, headache, and fatigue. The discontinuation rate due to adverse events was low across all Phase II and Phase III trials, ranging from 1.5% to 3.2%.

Research assessed whether the compound was associated with changes in quality of life across major studies. These secondary endpoints analyzed subjective measures such as physical functioning and emotional well-being using standardized questionnaires.

Studies have examined the safety profile of the compound during long-term administration in adults. The open-label extension studies documented that data from some lasting up to one year, report similar adverse event profiles as those observed during the initial short-term trials. Clinical trials for the compound focused on participants with a confirmed diagnosis of X.

Key Studies & References Phase II Study of Citarabina Combination Therapy in Treatment-Resistant Conditions

Frequently Asked Questions (FAQ)

Common questions about Citarabina (FAQ)


Q: What kind of cancers is Citarabina most often used to treat?

A: Official information indicates that Citarabina is primarily used to treat certain blood cancers. Its official uses include the initial treatment and subsequent management of Acute Myelocytic Leukemia (AML) in adults and children. It is also used to treat Acute Lymphocytic Leukemia (ALL) and the blast phase of Chronic Myelocytic Leukemia (CML).


Q: Does Citarabina cause hair loss like other chemo drugs?

A: Yes, hair loss, known as alopecia, is listed in the official product information as a very common side effect. It is often observed with skin rash and is specifically associated with high-dose Citarabina therapy.


Q: Can Citarabina be used to treat solid tumors or just blood cancers?

A: The officially approved uses for Citarabina are specific types of leukemias (blood cancers) and leukemia that has spread to the central nervous system (meningeal leukemia). The primary regulatory labels do not list any indications for treating solid tumors.


Q: Is it normal to feel extremely fatigued after Citarabina treatment?

A: The official product information indicates that fatigue and weakness are very common side effects experienced by patients receiving Citarabina. Therefore, severe fatigue is a common consequence of this treatment.


Q: What should be done if a dose of Citarabina is missed?

A: Official instructions advise that if a dose is missed, the healthcare team must be informed promptly. They will determine the necessary steps, which may include administering the dose as soon as possible and adjusting the remainder of the schedule to maintain the treatment interval.


Q: How is Citarabina usually prepared before it is given to a patient?

A: Standard Citarabina solutions must be diluted in compatible intravenous fluids right before they are administered. Official preparation instructions state that specialized formulations, such as the liposomal version, should not be diluted.


Q: Does Citarabina make you more susceptible to infections?

A: Yes. The official warnings state that myelosuppression (bone marrow suppression) is the main toxicity, which lowers the number of infection-fighting white blood cells. The label warns that this suppression increases the risk of serious or fatal infections and sepsis.


Q: What is the risk of developing a secondary cancer after Citarabina treatment?

A: As a type of cytotoxic medicine, official sources state that Citarabina can cause chromosomal damage. This action carries a potential risk of delayed effects, which official sources state can include the possible development of other cancers, such as secondary leukemia.


Q: Are there specific foods or supplements that interact with Citarabina?

A: The formal drug-drug interaction sections in regulatory documents list certain medications (like Flucytosine and Digoxin) and IV incompatibilities that must be avoided. However, no specific interactions or restrictions regarding food or nutritional supplements are formally documented.


Q: What tests are done to check if Citarabina is working?

A: Regulatory documentation indicates that drug effectiveness is monitored through regular blood counts and bone marrow examinations. They also assess the overall clinical response to determine how well the medication is achieving its therapeutic goal.


Q: Is Citarabina used in stem cell transplant regimens?

A: While Citarabina is not the transplant itself, regimens containing it are often used as preparatory steps. These regimens are often used to help achieve remission before a patient proceeds to a Hematopoietic Stem Cell Transplant (HSCT).


Q: What are the signs of a serious allergic reaction to Citarabina?

A: Official safety information warns that signs of a serious allergic reaction may include hives, difficulty breathing, and swelling of the face, lips, tongue, or throat. Immediate medical attention is required if these occur.


Q: How is Citarabina different from other similar chemo drugs used for leukemia?

A: Citarabina is specifically classified as a pyrimidine nucleoside analog antimetabolite. This means its mechanism is unique: it acts by mimicking a natural genetic building block to stop DNA synthesis and terminate the growth of the cancer cell’s DNA chain.


Q: Do people who have received Citarabina need special vaccinations?

A: Official warnings advise that the use of live or live-attenuated vaccines is restricted or must be avoided during Citarabina treatment. This is due to the drug’s immunosuppressive effects, which increase the risk of severe infection from the vaccine itself.


Q: What happens if Citarabina leaks outside the vein during IV administration?

A: Leakage outside the vein, known as extravasation, is a risk with these types of agents. It can result in local reactions such as pain, swelling, redness, and may rarely cause tissue necrosis (tissue damage). Management requires immediate attention from the healthcare provider.


Q: Is Citarabina a vesicant or an irritant?

A: Official clinical guidelines classify Citarabina as an irritant. While it can cause pain or inflammation at the injection site, it is less likely than a vesicant to cause severe blistering or tissue destruction.


Q: Are there restrictions on driving or operating machinery after a Citarabina infusion?

A: Due to potential Central Nervous System (CNS) side effects, patients may experience drowsiness (somnolence), dizziness, or confusion. It is advised to use caution regarding activities that require full mental alertness.


Q: What is the typical course or cycle of Citarabina treatment?

A: Treatment is not given continuously but is structured into distinct, time-bound treatment cycles or phases. These include the initial Induction phase and the follow-up Consolidation phase, which are separated by mandated drug-free rest periods.


Q: Can Citarabina affect a person's mood or mental clarity?

A: Yes, regulatory documents list effects related to the Central Nervous System (CNS). These can manifest as confusion, somnolence, personality changes, and sometimes as a more serious cerebral or cerebellar disorder.


Q: Does Citarabina have any known long-term cardiovascular side effects?

A: The official product safety information lists adverse reactions that affect the heart, including pericarditis (inflammation around the heart) and changes in heart rhythm like sinus bradycardia. In rare instances, it is also associated with fatal cardiomyopathy.


Q: What is the mechanism by which Citarabina causes myelosuppression?

A: Myelosuppression, or bone marrow suppression, is the most common and intended toxicity of the drug. It is a direct result of Citarabina acting as a cytotoxic agent that interferes with the rapidly dividing cells that produce blood cells in the bone marrow.


Q: How does the route of administration (IV vs intrathecal) change Citarabina's effects?

A: The route of administration affects how the body is exposed to the drug. The official information states that the risk of adverse reactions is explicitly related to the route, with administration directly into the spine (intrathecal) carrying an increased risk of severe neurotoxicity.


Q: What is the maximum number of cycles of Citarabina a person can typically receive?

A: There is no single, fixed limit for Citarabina alone, but for specific regimens, there are guidelines. For example, some combination protocols may recommend a maximum of 6 cycles of therapy for patients who are not planning to proceed to a stem cell transplant.


Q: What happens if Citarabina is given along with other medicines in the same IV solution?

A: Citarabina is physically incompatible with several products, including Heparin, Insulin, and certain penicillins. Official instructions strictly state that it must not be mixed with these agents in the same intravenous solution.


Q: Can Citarabina affect fertility in men or women?

A: Due to the drug's potential to cause chromosomal damage (mutagenic potential), regulatory documents strongly advise that both men and women of reproductive potential use effective contraception during treatment and for a period afterward.


Q: Are there delayed side effects from Citarabina treatment?

A: Yes, official safety warnings mention that some unwanted effects may not appear until months or even years after the medicine is stopped. This category includes the delayed development of certain types of secondary cancer.


Q: Why is Citarabina often given along with another drug, like an anthracycline?

A: Official information supports that Citarabina is frequently used in combination with other antineoplastic agents (such as anthracyclines). This is because clinical results for conditions like Acute Myelocytic Leukemia (AML) are often improved when combination therapy is utilized.


Q: Can pregnant women safely be around someone receiving Citarabina?

A: Citarabina is classified as a hazardous drug. Official product information on this hazardous drug requires careful storage and disposal to minimize exposure risks. Pregnant women should avoid handling the medication.

How should Citarabina be stored and disposed of?

Citarabina (Cytarabine) is a cytotoxic medicine, requiring careful storage and disposal to minimize exposure risk. The specific storage requirements, including whether it needs refrigeration (2°C to 8°C) or room temperature storage, vary by formulation and manufacturer. Always follow the instructions provided on the medication's label or by your pharmacist.

Key storage principles involve keeping the medication in its original, sealed container, protecting it from freezing, and storing it safely out of the sight and reach of children and pets. Do not use the injection if it appears discolored, cloudy, or contains particles.

Due to its hazardous nature, Citarabina should not be disposed of in household waste, down a sink, or flushed down the toilet. Used syringes, needles, and any remaining or expired medication must be collected in a designated cytotoxic sharps container (often with a purple lid) and returned to the hospital or pharmacy for proper, specialized disposal, such as high-temperature incineration.

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

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