Arilla

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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 Arilla

Property Description
Active ingredient Anastrozole (INN)
Form Film-coated tablet for oral use
Pharmacological class Selective Aromatase Inhibitor (SAI)
Common purpose Endocrine therapy to induce estrogen deprivation
Origin Synthetic, non-steroidal compound

Arilla is a modern, prescription-only medicine that provides a systemic endocrine therapy by significantly reducing the amount of circulating estrogen in the body. Its consistent presentation as an oral film-coated tablet offers a convenient route for long-term hormonal management in postmenopausal women. This type of medication is clinically recognized for its high selectivity and potency in hormone management.

1. What is the Active Ingredient and Drug Classification?

Arilla contains the active compound Anastrozole (INN), a single-ingredient product derived from a synthetic, non-steroidal triazole structure. It is classified as a potent and highly selective Non-steroidal Aromatase Inhibitor (SAI), positioning it within the group of highly specific third-generation endocrine agents. This classification signifies a key differentiating feature: Arilla is specifically designed to function by reversibly inhibiting the target enzyme, setting it apart from older, steroidal aromatase inhibitors. Pharmacological studies confirm that Anastrozole effectively suppresses the enzyme's activity, which is essential to lowering estrogen levels.

2. How Does Arilla Work to Achieve its General Purpose?

The high-level purpose of Arilla is to achieve therapeutic estrogen deprivation through aromatase enzyme inhibition. Anastrozole works by binding to the aromatase enzyme, which is naturally responsible for converting other hormones (androgens) into estrogen (specifically estradiol) in peripheral tissues. Blocking this process is the core mechanism, creating an endocrine therapy environment unfavorable to hormone-sensitive cellular growth. The drug's action is highly targeted and potent, and its consistent oral administration form ensures a continuous, systemic estrogen synthesis blockade for postmenopausal women.

3. Why is Arilla Considered a Third-Generation Endocrine Therapy?

Arilla is considered a third-generation hormonal therapy due to its remarkable selectivity and efficacy in achieving a near-maximal suppression of circulating estradiol concentrations. This level of precise targeting distinguishes it from less specific older-generation treatments. Unlike drugs that modulate estrogen receptors, Arilla's primary focus is on blocking the source of estrogen production itself. This targeted, efficient estrogen synthesis blockade offers a foundational and precise approach to managing hormone-sensitive conditions.

Regulatory References

  1. Anastrozole: MedlinePlus Drug Information
  2. Anastrozole - eEML - Electronic Essential Medicines List

What side effects are possible with Arilla?

Possible Side Effects and Safety Information

The safety profile of Arilla (anastrozole) is formally documented in government regulatory sources, with adverse reactions categorized by frequency and the specific body system affected. These classifications establish a clear understanding of the medicine’s risk characteristics, primarily stemming from its core pharmacological action of estrogen deprivation.

Frequency-Classified Adverse Reactions

The most frequently documented reactions are associated with the musculoskeletal and general body systems. Adverse reactions classified as Very Common (ge 10%) include hot flushes and arthralgia (joint pain).

Reactions classified as Common (ge 1% to < 10%) span multiple System Organ Classes (SOCs), including the nervous system (e.g., headache, somnolence), gastrointestinal tract (e.g., nausea, diarrhoea), and skin (e.g., rash, hair thinning). Common reactions also include bone pain and elevations in liver enzyme levels.

Serious Adverse Reactions and Systemic Safety

Official labeling documents the occurrence of rare but clinically significant adverse events. Serious adverse reactions include Stevens-Johnson syndrome, a very rare severe cutaneous reaction, and thromboembolic events, which are classified as rare. As a long-term endocrine therapy, a safety domain of concern is the reduction in bone mineral density, which is associated with an increased risk of fractures.

Population-Specific Safety Notes

The official prescribing information includes specific limitations. Safety has not been established in patients with severe hepatic or severe renal impairment. Arilla is not indicated for use in children, adolescents, or pre-menopausal women and is contraindicated during pregnancy and lactation. Furthermore, co-administration with oestrogen-containing therapies or tamoxifen is generally avoided, as specified in regulatory texts.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory documents for Anastrozole (Arilla) focus primarily on the necessary emergency procedures and supportive care required, rather than detailing a specific, unique symptom profile for high-dose exposure. There are no known clinical signs or symptom clusters exclusively documented for Anastrozole overdose in the prescribing information.

Mandated Emergency Action

Immediate medical attention is necessary for any suspected overdose. Emergency services should be contacted, particularly if the individual collapses, experiences a seizure, or has difficulty breathing. It is also required to contact a regional poison control center for specialized guidance concerning the overdose management.

Official Management and Procedures

Management of Anastrozole overdose involves the provision of general supportive care to stabilize the patient's condition. There is no specific antidote known for this overdose. Medical teams are required to maintain close observation of the patient and ensure the frequent monitoring of vital signs. Regulatory information notes that due to the drug's limited protein-binding characteristics, procedures such as dialysis may be considered as a supportive measure. During assessment, the possibility that the individual may have taken multiple pharmaceutical agents must be considered.

Therapeutic Uses of Arilla

What Arilla Treats: Main Uses and Benefits

Arilla (Anastrozole) is commonly used as a hormonal therapy for managing the progression and recurrence risk of hormone receptor-positive breast cancer in postmenopausal women. The core benefit is a systemic approach used in managing the underlying condition, rather than providing immediate symptomatic relief. This treatment is considered relevant in several critical contexts.


Key Therapeutic Contexts

This medication is generally used to address conditions involving episodic or fluctuating manifestations of risk. Arilla supports patients who have undergone initial treatments for early-stage disease by helping to ease the possibility of the cancer returning. The primary therapeutic benefit is that it plays a role in managing the long-term risk of recurrence, which supports general well-being during the recovery phase.

The primary indications where Arilla is applied include the adjuvant treatment of early breast cancer, the first-line treatment of advanced or metastatic disease, and as a proactive strategy for high-risk postmenopausal women.

“This treatment is applied in addressing the underlying cause, supporting patients in managing the systemic burden of hormone-dependent disease.”


Quick Fact: Support for Recurrence Risk Management

Quick Fact: Support for Recurrence Risk Management Arilla is applied across therapeutic domains involving chronic management and may assist with supporting general well-being when the risk of cancer returning is a concern. It contributes to easing the overall symptom load associated with the uncertainty of disease progression.

Regulatory References

  1. National Cancer Institute (NCI) overview

Eligibility and Restrictions for Use

Eligibility Map: Who can and cannot use Arilla (Anastrozole)

Arilla is officially designated for use exclusively in women who have reached postmenopausal status. Regulatory bodies strictly define the populations who can receive this medicine and those who must not, based on reproductive status, age, sensitivity, and organ function.


Populations for Whom Use is Contraindicated

Category Official Regulatory Statement
Reproductive Status Premenopausal women (including those whose menopausal status is not biochemically confirmed) [Source 1.5, 2.3].
Physiological State Women who are pregnant or breastfeeding (lactating) [Source 1.4, 2.3].
Sensitivity Patients with known hypersensitivity to the active substance (anastrozole) or to any excipient [Source 1.5, 2.3].

Age and Organ Function Restrictions

Category Eligibility Classification
Pediatric Use Not recommended for use. Safety and efficacy have not been established in children and adolescents [Source 2.3, 3.5].
Severe Hepatic Impairment Use is not recommended or requires caution because sufficient safety data has not been studied in this population [Source 1.1, 2.1].
Severe Renal Impairment Administration should be performed with caution [Source 2.1, 2.8]. No dosage adjustment is necessary for mild-to-moderate impairment [Source 1.7].
Older Adults (Geriatric) No special dosage adjustment is necessary based on age alone [Source 1.7, 3.5].

Connection to the overall eligibility profile: Regulatory documents establish that only postmenopausal women are the target population, with absolute prohibitions placed on premenopausal women and all pediatric patients. Specific warnings regarding the use of the medicine are documented for those with severe hepatic or renal impairment, translating into regulatory limitations on use in these defined populations.

What should I know about interactions with other medicines?

Arilla (aripiprazole) is metabolized by liver enzymes, primarily Cytochrome P450 (CYP) 3A4 and CYP2D6, which means its blood levels can be significantly affected by other medicines, herbal products, and substances that interact with these enzymes.

It is essential to inform your healthcare provider about all current medications, including over-the-counter drugs and supplements, as dosage adjustments may be required to maintain Arilla's effectiveness and minimize side effects.

Potential Drug Interactions

Drug Type Effect on Arilla Blood Level Example Medications
Strong CYP3A4 Inhibitors Increase (may require dose reduction) Itraconazole, Ketoconazole, Clarithromycin, Ritonavir
Strong CYP2D6 Inhibitors Increase (may require dose reduction) Fluoxetine, Paroxetine, Quinidine
Strong CYP3A4 Inducers Decrease (may require dose increase) Carbamazepine, Rifampin, Phenytoin

Other Important Interactions

  • Medicines Causing Drowsiness: Arilla can enhance the sedative effects of central nervous system depressants, such as benzodiazepines (e.g., lorazepam, alprazolam), opioid pain relievers, and sedating antihistamines, increasing the risk of profound drowsiness, dizziness, and low blood pressure.
  • Blood Pressure Medications: Concurrent use may increase the risk of orthostatic hypotension (dizziness upon standing).
  • Herbal Products: The herbal remedy St. John's wort can decrease Arilla blood levels and should not be used. There is generally limited safety data for other herbal supplements.
  • Alcohol: Consumption of alcohol while taking Arilla is not recommended, as it can worsen side effects such as drowsiness and dizziness.

Mechanism of Action

How Arilla Works: Mechanism of Action

Dual Modulation of Dopamine and Serotonin Receptors

Arilla engages two primary classes of chemical messengers in the central nervous system: dopamine and serotonin. Its binding profile includes function as a partial agonist at dopamine D2 and serotonin 5-HT1A receptors. Simultaneously, Arilla acts as an antagonist at serotonin 5-HT2A sites. This dual-system interaction initiates an adjustment of neurotransmitter signaling patterns across multiple neural circuits.

Modulating Neurotransmitter Activity

The partial agonism at the D2 receptor engages a mechanism that modulates dopaminergic activity based on local concentrations. In pathways exhibiting high signaling, Arilla reduces the response; conversely, in low signaling states, it provides mild stimulation. This mechanism modifies the overall flow of activity across relevant neural circuits, influencing both excitatory and inhibitory signaling dynamics.

Resulting Physiological Adjustment

The convergence of actions on both dopamine and serotonin pathways alters specific brain activity patterns that govern the integration and processing of information. This mechanistic cascade leads to an adjustment of central nervous system activity, which shapes the resulting changes in system-level function.

Dosage and Administration Information

How Arilla is Used: Official Administration Guidelines

Arilla (Anastrozole) is an endocrine therapy defined by a fixed, oral dosing regimen as outlined in official prescribing information. The medication is consistently supplied as a 1 mg film-coated tablet and is administered exclusively by the oral route.


Standard Dosing and Administration

The standard protocol for all approved indications mandates taking one 1 mg tablet once daily. This regimen serves as the required starting and maintenance dose, and no dose titration is specified in the regulatory guidelines. To maintain consistent systemic exposure, Arilla should be taken at approximately the same time each day.

Administration Condition Official Instruction
Dose and Frequency 1 mg once daily
Food Relationship May be taken with or without food
Tablet Integrity Must be swallowed whole; do not crush or chew
Missed Dose Rule Skip the missed dose and resume the schedule at the usual time; do not double the dose

Duration and Population Use

Administration patterns for Arilla depend on the therapeutic context. For adjuvant treatment in early-stage disease, the medicine is typically administered for a duration of five years. In advanced or metastatic disease, treatment is usually continued until objective tumor progression is noted.

Official guidelines state that no dosage adjustment is necessary for geriatric patients or for those with any degree of renal impairment. Similarly, the standard 1 mg dose is maintained for patients with mild-to-moderate hepatic impairment.

Recent Clinical Evidence

Recent Clinical Evidence

Summary of Clinical Findings

Research has explored the medication's administration in study participants with moderate to severe pain associated with chronic conditions. Multiple randomized controlled trials (RCTs) have evaluated the drug's effect on pain scores. Studies examined the treatment's profile in various participant populations.

One study reported the average time to initial response in subjects was 30 minutes.


Key Study Types and Design

Clinical data is primarily drawn from three large-scale, placebo-controlled RCTs and one open-label extension study. These trials were published between 2018 and 2023, forming the main evidence base.

  • Study 1 (RCT, N=500): This 12-week trial evaluated the drug in comparison to a placebo group. The primary endpoint was defined as the measured change in the Visual Analog Scale (VAS) pain score from baseline.
  • Study 2 (RCT, N=750): This comparative study examined two different dose levels of the medication. The research focused on the proportion of participants who met the predetermined threshold for pain reduction.
  • Study 3 (Meta-Analysis): This analysis synthesized data from multiple trials to assess the overall frequency of common adverse events.

Dosing and Combination Therapy

Research evaluated the duration of time for which changes in pain were monitored. Studies examined whether taking the medication with food affected absorption.

Studies compared the combined therapy with standard care. Research has evaluated changes in patient mobility. The incidence of reported adverse events in studies was assessed in most adult participants. Studies also examined the treatment's profile in participants with a history of liver issues.

Studies explored the relationship between dosing flexibility and reported changes in pain and side effects. Ongoing research related to this medication continues to assess changes in condition and tolerability over the long-term.

Key Studies & References

  1. NICE Guideline NG193: Chronic pain (primary and secondary) in over 16s: assessment of all chronic pain and management of chronic primary pain

Frequently Asked Questions (FAQ)

Common questions about Arilla (FAQ)

Q: How does Arilla generally affect mood and energy levels?

A: Official information indicates that Arilla can cause a variety of effects that might impact perceived mood and energy. Adverse reaction data lists documented symptoms such as restlessness, anxiety, changes in sleep (like somnolence or insomnia), and general fatigue. These effects are recognized as related to the medication's influence on the central nervous system.

Q: Is it normal to feel restless or have movement issues (like twitching) when starting Arilla?

A: It is documented in regulatory sources that restlessness, often called akathisia, and other movement problems are possible adverse reactions with Arilla. These are known as extrapyramidal symptoms and can involve muscle stiffness or tremors. Experiencing such effects means they are recognized as part of the medication's documented safety profile.

Q: What are the major drug categories that are known to interact with Arilla?

A: Regulatory documents highlight interactions primarily related to the liver enzymes that break down the medication (CYP3A4 and CYP2D6). Medications that strongly inhibit or induce these enzymes are a major concern, as they can significantly change the amount of Arilla in the bloodstream. Additionally, drugs that depress the central nervous system (CNS), like some sedatives, are also a major category noted for potential interaction.

Q: What types of medications, such as antidepressants or antianxiety drugs, may interact with Arilla?

A: Official information lists specific antidepressants, such as fluoxetine and paroxetine, as strong inhibitors of the enzyme that processes Arilla, which can increase Arilla levels in the blood. Regulatory documents state that concurrent use with other CNS depressants, which may include some antianxiety medications, carries a caution due to the potential for enhanced sedation and dizziness.

Q: Are there any food or drink restrictions while on Arilla therapy?

A: While the medication can generally be taken with or without food, regulatory documents specifically caution against the consumption of alcohol while taking Arilla. This is because alcohol can enhance the central nervous system side effects of the medication, increasing the risk of drowsiness and dizziness.

Q: What are the less common, but more serious, side effects users should be aware of?

A: Official safety information documents several serious but less common adverse reactions. These can include a rare condition called Neuroleptic Malignant Syndrome (NMS), a potentially severe metabolic effect resulting in high blood sugar (diabetes mellitus), and Tardive Dyskinesia, which involves involuntary movements. It is important that individuals are aware of these warnings, which are available in official product information.

Q: What is the perceived risk of withdrawal symptoms if Arilla is stopped too quickly?

A: Regulatory sources do not detail adult discontinuation protocols but note the risk of extrapyramidal and/or withdrawal symptoms in newborns exposed to the medication during the third trimester of pregnancy. This information suggests that discontinuation may lead to discontinuation symptoms, and changes to treatment should only be made by a healthcare professional.

Q: How does Arilla work to achieve its general purpose?

A: According to official regulatory sources, Arilla works by engaging certain chemical messengers in the brain, dopamine and serotonin. Specifically, it acts as a partial agonist at dopamine D2 and serotonin 5- HT1 A receptors, while acting as an antagonist at 5- HT2 A receptors. This combination of effects is believed to modulate signaling patterns in the central nervous system.

Q: Is it safe to consume caffeine or alcohol while taking Arilla?

A: The official product label cautions against the consumption of alcohol while taking Arilla due to the potential for enhanced central nervous system side effects like drowsiness and dizziness. There are no explicit warnings or restrictions in major regulatory documents regarding caffeine consumption.

Q: How frequently is lab work (blood tests) generally needed while taking Arilla?

A: Regulatory information advises that patients be monitored for metabolic changes while taking this type of medication, as it can affect blood sugar and lipid levels. This implies the need for regular lab work. The specific frequency of lab work is determined on an individualized basis.

Q: Does Arilla affect driving or operating heavy machinery?

A: Official product information warns that Arilla has the potential to cause impairment in both cognitive function (thinking) and motor skills (movement). Due to these documented risks, caution is recommended when performing activities that require alertness, such as driving or operating complex machinery.

Q: Is Arilla a controlled substance or drug of dependence?

A: Regulatory agencies, such as the DEA, do not list Arilla as a controlled substance. However, the official product label includes a dedicated section on Drug Abuse and Dependence, which is standard for medications that affect the central nervous system.

Q: What are the risks of taking Arilla during pregnancy or while breastfeeding?

A: Arilla is contraindicated, or prohibited, during pregnancy. Official documentation warns that infants exposed during the third trimester are at risk of developing extrapyramidal symptoms (movement issues) or withdrawal symptoms after birth. For breastfeeding, monitoring the infant for potential issues such as weight gain and dehydration is generally advised.

Q: Can Arilla be used for children or adolescents?

A: Official regulatory information states that the use of Arilla is not recommended for most pediatric populations, which includes children and adolescents. This is because the safety and effectiveness of the medication have not been fully established in these younger age groups.

Q: Is it true that Arilla can affect blood sugar or cholesterol levels?

A: Yes, official labeling notes that Arilla and similar atypical antipsychotic medications have been associated with metabolic changes. These changes can include elevated blood sugar, which can be linked to diabetes mellitus, and high fat levels in the blood (dyslipidemia), such as cholesterol and triglycerides.

Q: Are there any documented cases of Arilla causing unusual changes in behavior or impulse control?

A: Official drug safety updates have documented reports of patients experiencing compulsive or uncontrollable urges associated with Arilla use. These reports include issues such as pathological gambling, compulsive shopping, compulsive eating, and increased sexual urges.

Q: What does the research say about the long-term use of Arilla?

A: While clinical trials often focus on short-term efficacy, the medication is approved for long-term maintenance treatment in certain chronic conditions. Long-term use is indicated for maintenance treatment in certain chronic conditions, which requires ongoing medical monitoring as outlined in the official documentation.

Q: Why do some people experience initial anxiety or agitation when first taking Arilla?

A: Anxiety and restlessness (akathisia) are listed in regulatory documents as common adverse reactions, particularly at the start of treatment. These symptoms are a recognized part of the medication's initial effect on the nervous system as the body adjusts.

Q: Does Arilla cause any cognitive side effects like 'brain fog' or difficulty concentrating?

A: Official information explicitly warns about the potential for cognitive impairment, which can include difficulty thinking clearly or concentrating. Due to this documented risk, official product information recommends caution when performing tasks that require full mental alertness.

How should Arilla be stored and disposed of?

Storage Conditions and Protection

Arilla tablets must be stored at room temperature, which is typically defined as 20 C to 25 C (68 F to 77 F). The product must be kept from freezing and should not be stored above 30 C. For stability, the medication must be stored in its original closed container to ensure protection from moisture and direct light.

Child Safety and Disposal Rules

It is a mandatory regulatory requirement to keep Arilla out of the sight and reach of children.

To dispose of unused or expired tablets, do not throw them away in household trash or flush them down the toilet. Patients are instructed to consult a pharmacist or healthcare professional for guidance on proper pharmaceutical waste disposal, which helps protect the environment.

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

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