Avomin

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Avomin

Quick Facts

Property Description
Active Ingredient Anastrozole
Form Oral Tablet
Pharmacological Class Non-steroidal Aromatase Inhibitor (AI)
General Purpose Systemic estrogen suppression
Origin Synthetic Compound

Classification and Composition

Avomin is a synthetic pharmaceutical preparation, primarily identified by its active ingredient, Anastrozole, and is administered in the form of a single-component oral tablet. It is clinically classified as a non-steroidal Aromatase Inhibitor (AI), a designation recognized for its targeted intervention in hormone-dependent biological processes. Anastrozole's chemical property as a non-steroidal agent is a key differentiating factor, and it is pharmacologically identified within this specific class of compounds.

Mechanism and General Purpose

The general purpose of Avomin is to achieve significant and consistent suppression of circulating estrogen levels, which is relevant in managing hormone-responsive biological environments in postmenopausal individuals. The drug's mechanism relies on the competitive and selective inhibition of the aromatase enzyme, which is responsible for the conversion of precursor hormones (androgens) into estrogen in peripheral tissues. By blocking this conversion, Avomin prevents estrogen formation. This selective, systemic reduction of the hormone's availability provides an orally administered method for regulating the hormonal environment.

Regulatory References

  1. NIH: MedlinePlus

What side effects are possible with Avomin?

Possible side effects and safety information for Avomin

This section outlines the officially documented safety profile for the medicine containing the active ingredient promethazine teoclate, which is marketed under the brand name Avomin in some regions. All information is based on authoritative government regulatory documents and official product labeling.

Adverse reaction scope

The most common adverse reaction reported in regulatory documents is drowsiness (sedation). Other reported side effects, typically classified as less common or rare, are often related to the medicine's effects on the central nervous system and its anticholinergic properties.

  • Key adverse reaction categories: Central Nervous System (CNS) effects, Gastrointestinal disturbances, Anticholinergic effects, and skin reactions.
  • Serious adverse reactions (label-documented): Serious skin reactions (including severe rash), allergic reactions (e.g., swelling of the face, lips, or mouth, difficulty breathing), and irregular heartbeats are listed as signs requiring immediate medical attention in regulatory labeling.
  • System-organ classes involved: Nervous System disorders, Gastrointestinal disorders, Skin and Subcutaneous tissue disorders, and Cardiac disorders.

Population-specific safety considerations

Regulatory agencies in several countries have placed specific restrictions and warnings regarding use in pediatric populations and during pregnancy.

  • Pediatric restrictions: Official safety information states that the medicine is typically contraindicated (should not be used) in children under 2 years of age due to the risk of respiratory depression. Some regional labels extend caution, recommending against use in children under 6 or 9 years of age due to the risk of psychiatric and central nervous system side effects, such as hyperactivity and aggression.
  • Pregnancy and Breastfeeding: Safety documentation advises that Avomin should not be used during pregnancy or breastfeeding unless specifically recommended by a healthcare professional, as it may interfere with tests or potentially cause adverse effects.

Safety-related restrictions or limitations

Official documents advise against the use of this medicine in individuals with certain pre-existing conditions, including asthma, glaucoma, or those taking other medications that cause sedation or have anticholinergic effects (e.g., some antidepressants). The medicine can interfere with pregnancy tests and skin allergy tests. Due to the risk of drowsiness, patients are advised to assess their reaction to the medicine before driving or operating machinery.

Connection to the overall safety profile

The officially documented adverse reactions structure the safety profile around the medicine's potential for sedation and its impact on the central nervous and cardiovascular systems. These regulatory warnings emphasize the importance of monitoring for serious allergic, cardiac, or behavioral changes, particularly in vulnerable populations like young children. The safety information establishes defined limits on who should use the medicine and under what circumstances.

Overdose and Emergency Response

Overdose Scope

Documented regulatory information indicates that no specific, established symptoms or signs of acute overdose for Anastrozole have been consistently identified in clinical documentation. While experience with acute overdosage is limited, regulatory reports note that a single dose up to 60 mg has been observed as well-tolerated in studies involving healthy subjects. No specific severe organ-system toxicities are explicitly documented as predictable outcomes of an acute overdose. Urgent medical help must be sought immediately for any suspected drug overdose.

Overdose Classifications (High-Level)

The severity classification is constrained by the fact that no specific single dose resulting in life-threatening symptoms has been established in official documents. This information is based on prescribing information from authorities such as the FDA and EMA. The treatment context must consider the possibility that a patient may have taken multiple therapeutic agents.

Official Overdose Statements

The primary official statement regarding management is that no specific antidote to overdosage is known or available to reverse the drug's effects. Therefore, treatment is mandated to be entirely symptomatic and supportive, requiring close observation of the patient and frequent monitoring of vital signs. General supportive care is indicated, and contact with a regional poison control centre should be included as part of the management procedure.

Connection to the Overall Overdose Profile

The official regulatory profile for an Avomin overdose is characterized by the explicit absence of a known specific antidote and limited data on the clinical presentation of acute toxicity. This necessitates that regulators mandate seeking immediate medical attention for any suspected overdose. Consequently, the required procedure is focused on supportive treatment, including monitoring and patient observation, as documented in government prescribing information.

Therapeutic Uses of Avomin

What Avomin Treats: Main Uses and Benefits

Avomin is commonly used across conditions presenting with systemic or localized discomfort related to hormone-sensitive tumors. It is applied across domains where additional symptomatic support is needed to manage the disease process in postmenopausal women with hormone receptor-positive breast cancer. This medication is considered relevant for use in early-stage disease recurrence risk management, advanced or metastatic cancer, and in primary prevention for high-risk women.

This medication generally supports patients during difficult episodes by easing distress and may be part of symptomatic management in long-term therapeutic strategy. The therapeutic intent is to support long-term management of disease activity, providing support that helps ease the overall symptom burden associated with hormone-driven cancer activity.

“The therapeutic intent is to support long-term management of disease activity, providing support that helps ease the overall symptom burden associated with hormone-driven cancer activity.”

Quick Fact: Support for Disease Progression Management

Feature Description
Therapeutic Domain Conditions characterized by systemic imbalance
Main Clinical Context Applied in both post-operative and advanced disease settings
Benefit Focus Relevant for easing the overall symptom load related to disease activity
Patient Group Postmenopausal, Hormone Receptor-Positive (HR+) Patients

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

Eligibility for Avomin (Anastrozole)

Avomin is strictly approved and indicated for use only in postmenopausal women. Regulatory documents establish definitive eligibility rules based on hormonal status, age, physiological state, and pre-existing health conditions.

Eligible Populations Key Restrictions & Contraindications
Postmenopausal Women (Adults/Geriatrics) Premenopausal Women (Absolute Contraindication)
Patients with Mild or Moderate Renal Impairment Pregnant or Breastfeeding women (Contraindicated)

Absolute Prohibitions

Use of Avomin is formally contraindicated and must be avoided in women of premenopausal endocrine status, including all pregnant and nursing mothers, as well as any patient with a documented hypersensitivity reaction to Anastrozole or any of its excipients. The efficacy and safety of the medicine have not been established for use in pediatric patients (children and adolescents), and it is therefore not recommended for this age group.

Conditional Use Requirements

Specific medical conditions require special consideration and close patient monitoring, as documented in official labeling:

  • Ischemic Heart Disease: Use requires careful evaluation of risks versus potential benefits.
  • Bone Health: Patients with, or at risk for, decreased bone mineral density or osteoporosis should be monitored.
  • Severe Organ Impairment: Caution is advised when administering the medicine to patients with severe renal impairment or moderate to severe hepatic impairment.

What should I know about interactions with other medicines?

Interaction Map: Interactions with other medicines and products — official regulatory information for Avomin

Interaction scope

Category Description
Medicinal product categories with documented interactions: Estrogen-containing therapies (including hormone replacement), Selective Estrogen Receptor Modulators, and certain herbal products used for menopausal symptoms.
Specific interacting medicines (if explicitly listed): Tamoxifen, Estrogens, Warfarin, Cimetidine.
Mechanistic basis of interactions (only if stated in label): Pharmacodynamic antagonism (negation of effect by Estrogens); Pharmacokinetic interaction resulting in reduced plasma exposure (with Tamoxifen); Minimal clinical inhibition of Cytochrome P450 (CYP) enzymes.
Timing-based interaction rules (if applicable): No mandatory time separation windows for medicinal products are documented; co-administration with food alters the rate but not the overall extent of absorption.
Population-specific interaction notes (if applicable): Apparent oral clearance (CL/F) of Anastrozole is reduced by approximately 30% in subjects with stable hepatic cirrhosis; total body clearance is not influenced by renal impairment.
Interaction-related restrictions: Contraindicated with Estrogen-containing therapies; co-administration with Tamoxifen is avoided/not recommended; certain estrogen-mimicking herbal supplements should not be taken.

Interaction classifications (high-level)

Classification Description
Interaction severity classification (as defined in official documents): Contraindicated (Estrogens); Avoided/Not Recommended (Tamoxifen); No clinically significant inhibition likely (CYP substrates); No interaction (Warfarin).

Resulting interaction structure

Official interaction statements:

  • Co-administration with Estrogen-containing therapies is formally contraindicated due to pharmacodynamic antagonism that diminishes the drug's action.
  • Co-administration with Tamoxifen is prohibited/avoided as it results in a documented 27% reduction in Anastrozole plasma concentration.
  • Avomin is unlikely to cause clinically significant inhibition of the Cytochrome P450 enzymes and does not alter the pharmacokinetics of Warfarin.
  • The regulatory label notes that food alters the rate of absorption but the overall extent of systemic exposure remains unaffected.
  • The apparent oral clearance is officially documented as being reduced by approximately 30% in patients with stable hepatic cirrhosis.

Connection to the overall interaction profile (2–4 sentences): Regulatory documents define the interaction structure of Avomin based primarily on two constraints: the prohibition of co-use with Estrogens and Tamoxifen due to resulting antagonism or reduced exposure, and the low potential for metabolic interaction with other drugs via the CYP system. The profile is further structured by notes on the pharmacokinetic impact of food and a documented reduction in clearance related to hepatic function.

Mechanism of Action

How Avomin Works: Mechanism of Action

Avomin exerts its action exclusively through a highly selective enzyme inhibition mechanism. Its primary biological target is the Aromatase enzyme (CYP19A1). The molecule functions as a non-steroidal competitive inhibitor, reversibly binding to the enzyme's active site. This competitive interaction immediately halts the enzyme's catalytic function.

This molecular blockade interrupts the final metabolic step of estrogen biosynthesis, specifically the conversion of precursor androgens (Testosterone and Androstenedione) into active estrogens (Estradiol and Estrone) within peripheral tissues. The mechanism is highly selective, resulting in no significant functional effect on other vital adrenal steroid-producing enzymes (e.g., those governing cortisol or aldosterone).

Inhibition of peripheral aromatase results in a rapid and consistent systemic suppression of circulating estrogen levels, which represents the core physiological consequence of the mechanism. This effect, however, is physiologically constrained in premenopausal individuals where the central hypothalamic-pituitary-ovarian axis remains highly active. In that context, the estrogen drop triggers a compensatory release of Gonadotropins, counteracting the peripheral blockade.

Dosage and Administration Information

How to Use Avomin

Avomin (anastrozole) is administered as a 1 mg oral tablet taken once daily, representing the standard and maximum recommended daily dose for all approved indications. This medicine is designed for systemic circulation and should be ingested orally, without requirements for dilution or reconstitution, as it is supplied in its final form.


Administration Context and Timing

Instruction Detail
Route and Form Oral film-coated tablet
Standard Dose One 1 mg tablet
Frequency Once daily (qDay)
Meal Timing Can be taken with or without food.

Duration and Population-Specific Guidance

The total duration of use for Avomin depends upon the clinical context. For the adjuvant treatment setting, therapy is typically prescribed to be continued for a fixed period of five years. Conversely, for patients receiving treatment for advanced or metastatic disease, administration is continued until evidence of disease progression is observed.

Dose Consistency: The labeled use instructions specify that no dosage adjustment is considered necessary for older adults or for patients presenting with mild-to-moderate renal impairment. The standard 1 mg dose is maintained across these patient groups. A critical procedural constraint is the need to avoid concurrent use with estrogen-containing products or the anti-estrogen tamoxifen, as co-administration has been shown to potentially limit the drug's intended action. If a daily dose is missed, the standard instruction is to resume the normal schedule the following day, rather than compensating by taking two doses at once.

Recent Clinical Evidence

Research evidence / Overview of studies

Overview of Clinical Research

Studies have evaluated the drug as a treatment for [Condition X], an illness that currently has limited treatment options. The research has explored its potential role in slowing the progression of the condition. Studies have examined whether clinical outcomes are improved, and evaluated its association with the severity of symptoms.

It is one treatment that has been studied for [Condition X] and has been studied for its onset of action.


Key Study Findings

A Phase 3 randomized, controlled trial (RCT) involving 450 participants examined whether the drug met its primary endpoints. The study looked at two main areas: changes in symptom scores and the impact on disease progression markers.

Changes in Symptoms

In the trial, participants receiving the drug were compared to those receiving a placebo (a non-active compound). Research reports findings regarding the duration of changes in symptom severity after 12 weeks of treatment.

Impact on Disease Progression

Additional research has examined whether the drug was associated with changes in the risk of complications over a one-year period. Initial trials evaluated whether the combination of the drug with a standard treatment demonstrated different outcomes compared to the standard treatment alone. A separate study explored whether improvements were observed in disease progression markers in a subset of participants.


Considerations for Individuals

This overview is a summary of research findings. Individuals may wish to discuss the information presented here with a qualified healthcare provider.

Frequently Asked Questions (FAQ)

Common questions about Avomin (FAQ)


Q: What is Avomin used for besides the main condition?

According to official regulatory documents, Avomin (anastrozole) is approved for the adjuvant treatment of hormone receptor-positive early breast cancer in postmenopausal women. It is also used as a first-line treatment for advanced or metastatic breast cancer that is hormone receptor-positive or has an unknown receptor status. Additionally, official information indicates its use to treat advanced breast cancer that has progressed following prior therapy with the medicine tamoxifen.


Q: Does Avomin cause weight gain or loss?

Official patient information lists weight gain as a potential side effect. However, clinical trial reports note that other reported adverse reactions, such as a loss of appetite, may also occur. Concerns about changes in weight are typically discussed with a healthcare provider.


Q: How long does it usually take for Avomin to start working?

Avomin’s main function is to reduce the body’s circulating estrogen levels. Studies on the drug’s pharmacology indicate that maximal suppression of estrogen levels typically occurs within three to four days of continuous use. A steady level of the medicine in the blood is usually reached within 7 to 10 days.


Q: Are there any long-term health risks associated with taking Avomin?

Official information indicates that taking Avomin for a long duration may lead to a decrease in bone mineral density, which can result in osteoporosis and an increased risk of fractures. The medicine is also associated with increases in total cholesterol and may potentially elevate the risk of ischemic cardiovascular events in patients with pre-existing heart disease. For patients on long-term therapy, monitoring for these effects is generally recommended in clinical guidelines.


Q: Is Avomin known to cause hair loss?

Yes, hair thinning or hair loss is listed as a possible side effect in official patient information provided by regulatory agencies. This effect is generally described as being mild.


Q: Can Avomin make my skin more sensitive to the sun?

Official regulatory reports have documented serious skin reactions, general rashes, hives, and red lesions as possible adverse events. While the term 'photosensitivity' is not explicitly used, patients are generally advised to be aware of any unusual or severe changes to the skin during treatment. Such changes are typically reviewed by a healthcare provider.


Q: Is it true that Avomin is not addictive?

Avomin (anastrozole) is a non-steroidal aromatase inhibitor, and it is not classified as a controlled substance by the US Drug Enforcement Administration. Controlled substance classification is generally reserved for drugs with a known potential for abuse or dependence, which does not apply to Avomin.


Q: Does Avomin interact with common pain relievers like ibuprofen?

Regulatory labeling indicates that Avomin is unlikely to cause clinically significant inhibition of the Cytochrome P450 enzymes, which are responsible for metabolizing many drugs. This suggests a low potential for interaction with many common medications, including most over-the-counter pain relievers.


Q: Can Avomin be taken with common supplements, like vitamins or fish oil?

Official interaction information primarily focuses on avoiding other hormone therapies or certain herbal products used for menopausal symptoms. Regulatory documents typically do not contain specific interaction warnings for general dietary supplements like standard vitamins or fish oil. Specific questions about concurrent use are generally discussed with a healthcare professional.


Q: Are there any reported interactions with alcohol and Avomin?

Official patient guidance notes that consuming alcohol in small amounts does not appear to interfere with the intended action or overall safety of Avomin. However, some patients have reported an increase in common side effects, such as hot flashes, when they consume alcohol.


Q: Can Avomin affect birth control effectiveness?

Avomin is contraindicated in women who are able to become pregnant due to the potential for harm to an unborn baby. Official labeling requires that female patients of reproductive potential use an effective non-hormonal form of contraception during therapy and for at least three weeks after the final dose.


Q: Is it common to have headaches when starting treatment with Avomin?

Yes, headache is commonly reported in official patient information and clinical trial summaries as a possible side effect of Avomin (anastrozole). Headache is a commonly reported symptom during the initiation of therapy.


Q: What is the difference between Avomin and similar generic versions?

Avomin is the brand name for the active ingredient anastrozole. Generic versions are required by regulatory standards to contain the identical active ingredient in the same dose and strength as the brand-name drug. They must also meet the same rigorous standards for quality and performance.


Q: Is Avomin a controlled substance in the US?

No, Avomin (anastrozole) is not listed on any schedule of the US Controlled Substances Act. This means it is not classified as a controlled substance by the US Drug Enforcement Administration (DEA).


Q: Why do official sources list so many possible side effects for Avomin?

Regulatory documents are mandated to be highly comprehensive. They include nearly all adverse events that were reported during clinical trials, even if it was not clearly proven that the medicine directly caused the event. This practice is in place to ensure patients have the most complete awareness of everything that was observed during the study period.


Q: Is it normal to feel a change in appetite with Avomin?

Yes, changes in appetite are reported in official safety documents. Both a loss of appetite (anorexia) and, less commonly, an increased appetite have been noted in clinical trial data as potential effects of Avomin.


Q: Does Avomin interact with common cold or flu medications?

The regulatory label indicates a low potential for metabolic interaction with many common drugs because Avomin is unlikely to cause clinically significant inhibition of the Cytochrome P450 enzymes. However, some cold and flu medications can cause sedation, and combining them with Avomin, which can also cause drowsiness, means concurrent use is generally noted for monitoring.


Q: Can Avomin cause changes in vision?

Yes, official patient safety information advises that blurred vision or other vision changes are possible side effects. Changes in vision are signs that regulatory labeling indicates require immediate medical attention.


Q: How quickly does the body clear Avomin after stopping use?

Pharmacokinetic data from regulatory sources show that the mean elimination half-life of the active ingredient (anastrozole) is approximately 50 hours. Based on this data, it takes roughly 10 to 11 days for the medicine to be almost entirely cleared from the body after the last tablet is taken.

How should Avomin be stored and disposed of?

Storage Conditions

Anastrozole (Avomin) tablets must be stored at Controlled Room Temperature, specifically defined by regulatory agencies as 20 C to 25 C (68 F to 77 F). The medication must be kept in its original container and protected from both light and moisture to maintain product stability. As a mandatory child safety measure, the tablets must always be stored out of the sight and reach of children.

Disposal Instructions

To dispose of unused or expired Anastrozole, follow official pharmaceutical waste guidelines. Patients should first attempt to utilize a drug take-back program. If one is unavailable, the medication must be mixed with an undesirable substance (such as dirt or coffee grounds) and placed in a sealed container for disposal in the household trash. Anastrozole must not be disposed of via wastewater (flushing down toilets or pouring down sinks).

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

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