Mirabel

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Mirabel

Method of action: Ophthalmologicals

Treatment option:

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 Mirabel

Property Description
Active ingredient Mirabegron
Form Extended-release tablet (Oral)
Pharmacological class beta3-Adrenoceptor Agonist
Common use Improving bladder storage capacity
Origin Synthetic (small-molecule)

What Type of Medicine is Mirabel (Mirabegron)?

Mirabel is a prescription medication whose active ingredient is mirabegron, used for managing the symptoms of overactive bladder (OAB). It is formally classified as a beta3-adrenoceptor agonist (beta3 agonist), which means it acts on specific receptors in the bladder wall. This unique classification distinguishes it from the older, well-known class of OAB medications known as antimuscarinics. As a clinically recognized second-line treatment option for OAB, it provides a distinct, medically supported option for patients who may not tolerate or respond well to other common treatments.


What is Mirabel Made Of and How is it Supplied?

Mirabegron is a synthetic small-molecule drug and is primarily supplied as an extended-release tablet for oral administration (taken by mouth). As a synthetic compound, its chemical structure is precise and standardized, with the known molecular formula C21H24N4O2S. The extended-release form is a key feature, as it ensures the mirabegron is delivered slowly and consistently into the body over several hours after swallowing, unlike an immediate-release tablet. This extended-release design allows for continuous symptom management throughout the day and night. For patients, this formulation supports a simplified, once-daily dosing regimen to manage symptoms like frequently needing to urinate.


What is the General Purpose of Mirabel?

The general purpose of Mirabel is to address the core problem of OAB by improving the bladder's capacity to store urine. It does this by acting as a smooth muscle relaxant on the detrusor muscle, the main muscle of the bladder wall. By promoting the relaxation of the bladder muscle during the filling cycle, the drug helps increase the total amount of urine the bladder can comfortably hold. Ultimately, this specific action helps reduce bothersome symptoms such as sudden, intense urinary urgency and increased urinary frequency, thereby helping patients regain better daily control.

Regulatory References

  1. Mirabegron: MedlinePlus Drug Information
  2. Urge Incontinence - StatPearls - NCBI Bookshelf

What side effects are possible with Mirabel?

Possible Side Effects and Safety Information

The safety profile of Mirabel (mirabegron) is officially documented by government regulatory agencies, classifying potential reactions by frequency and the body systems affected. The most frequently documented side effects are classified as Common, affecting up to 1 in 10 patients. These often involve the cardiac and urinary systems, and may include Tachycardia (increased heart rate), Urinary tract infection, Headache, Dizziness, Nausea, Constipation, and Diarrhoea.


Serious Adverse Reactions and Systemic Concerns

Adverse reactions classified as Uncommon or documented through post-marketing surveillance are considered clinically significant. Serious adverse reactions explicitly noted in regulatory documents include Hypertensive crisis (a severe, acute elevation of blood pressure), Atrial fibrillation (an irregular heart rhythm), Angioedema (swelling of the face, lips, or tongue), and Urinary retention, particularly in patients with severe Bladder Outlet Obstruction (BOO).


Safety Constraints and Special Populations

Official labeling defines specific safety constraints. The medicine is contraindicated (must not be used) in individuals with severe uncontrolled hypertension (Systolic ge180 mmHg or Diastolic ge110 mmHg). Use is not recommended in patients with End-Stage Renal Disease (ESRD) or severe hepatic impairment (Child-Pugh Class C). Safety data also indicates that the highest frequency of adverse events is observed within the first 30 days of treatment. In older adults (ge65 years), the frequency of serious adverse events was generally greater in clinical trials than in younger adults.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory profile for Mirabel overdose centers on exaggerated cardiovascular effects. Documented overdose presentations include palpitations, an increased pulse rate (tachycardia), and observed increases in systolic blood pressure. These effects were noted in clinical studies involving single doses up to 400 mg in healthy volunteers, confirming the primary physiological system affected is the cardiovascular system.

Immediate medical help is required for any suspected overdose. Official guidance mandates immediately contacting a Poison Control Center or seeking emergency medical attention. Urgent emergency services must be called if the patient exhibits severe clinical signs such as collapse, seizure, unconsciousness, or trouble breathing.

Management is defined as symptomatic and supportive treatment because no specific antidote is known for Mirabegron overdose. Due to the cardiovascular manifestations observed, ECG monitoring (electrocardiogram monitoring) is recommended as part of the mandatory observation requirements in the event of overdosage, ensuring continuous assessment of heart function. No unique population-specific overdose manifestations are explicitly listed in the regulatory labeling.

Therapeutic Uses of Mirabel

What Mirabel treats: main uses and benefits

Mirabel is a medication primarily prescribed for the management of symptoms associated with overactive bladder (OAB). It belongs to a class of drugs known as beta-3 adrenergic agonists. By activating specific receptors in the bladder muscle, the medication helps the bladder relax during the storage phase, increasing its functional capacity.

Main Uses

The medication is used to address a cluster of urinary symptoms that can significantly impact daily activities. These include:

  • Urge Urinary Incontinence: A sudden, strong need to urinate followed by involuntary leakage.
  • Urgency: A compelling and immediate need to urinate that is difficult to delay.
  • Frequency: The need to urinate more often than usual, typically defined as eight or more times in a 24-hour period.

How It Works

Unlike older classes of medications for overactive bladder that block involuntary muscle contractions, Mirabel works by enhancing the bladder's ability to relax as it fills with urine. This mechanism allows the bladder to hold a larger volume of fluid, which reduces the frequency of the signals sent to the brain indicating that the bladder is full.

Expected Benefits

Patients using Mirabel may experience several improvements in their urinary health and overall quality of life:

  • Reduction in Leakage Episodes: A decrease in the number of accidental leaks experienced daily.
  • Fewer Bathroom Visits: A reduction in the total number of times one needs to void throughout the day and night.
  • Increased Warning Time: A decrease in the intensity of the sudden urge to urinate, providing more time to reach a restroom.
  • Improved Daily Functioning: By managing these symptoms, individuals may find it easier to engage in social, professional, and physical activities without the constant concern of locating a nearby restroom.

Regulatory References

  1. NIH MedlinePlus overview

Eligibility and Restrictions for Use

Mirabel (mirabegron) eligibility is strictly defined by regulatory guidelines based on age, underlying health status, and organ function.

Contraindications and Exclusion

Mirabel must not be used by patients who have a known hypersensitivity to mirabegron or any tablet ingredients. The medicine is also formally contraindicated in patients with severe uncontrolled hypertension, defined as systolic blood pressure ge 180 mm Hg and/or diastolic blood pressure ge 110 mm Hg.

Use is not recommended in patients with End Stage Renal Disease or severe hepatic impairment (Child-Pugh Class C). The medicine is also not recommended for nursing mothers, as it is predicted to be excreted in human milk.

Eligibility and Restrictions

Population Group Eligibility Status (Regulatory Labeling)
Adults (OAB) Approved for use (Age ge 18 years).
Pediatric (NDO) Approved for Neurogenic Detrusor Overactivity (NDO) only, in patients aged 3 years and older.
Older Adults (Geriatric) Use is established; no routine dose adjustment is needed based on age alone.
Severe Renal or Moderate Hepatic Impairment Requires a maximum dose restriction of 25 mg once daily.

The safety and effectiveness of Mirabel for treating OAB symptoms in children and in children under 3 years of age have not been established by regulatory data. The medicine requires caution in patients with clinically significant Bladder Outlet Obstruction.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official Regulatory Information

The interaction profile for Mirabel is defined by its effects on specific metabolic enzymes and drug transporters, which necessitate caution or specific monitoring when co-administered with certain medications. The officially documented interactions involve three primary domains:

Interaction Mechanism Interacting Substances/Classes
CYP2D6 Inhibition Narrow therapeutic index substrates (e.g., Thioridazine, Flecainide, Propafenone)
P-gp Inhibition P-gp substrates (e.g., Digoxin)
Additive Pharmacodynamic Effect Other Antimuscarinic OAB Medications

Mirabegron is classified as a moderate inhibitor of the CYP2D6 enzyme, which is documented to increase the systemic exposure of co-administered substrates like the antiarrhythmics Flecainide and Propafenone. The medication also inhibits the P-gp transporter, leading to increased serum concentrations of Digoxin, for which serum concentration monitoring is required upon initiation.

Restrictions and Constraints

The co-administration of strong CYP3A inhibitors (e.g., Ketoconazole) is officially not recommended for use in patients with pre-existing severe renal impairment or moderate hepatic impairment, as this combination significantly increases Mirabegron's systemic exposure. Furthermore, combining Mirabel with Antimuscarinic OAB medications may result in an additive effect associated with reports of urinary retention and must be used with caution.

Food and Timing

The extended-release tablet may be administered with or without food; no formal timing-based separation rules are documented.

Mechanism of Action

How Mirabel Works

beta3 Agonism: Targeting Bladder Muscle Modulation

Mirabel acts as a selective agonist primarily targeting the beta-3 (beta3) adrenergic receptors found on the smooth muscle (detrusor) of the bladder wall. This targeted interaction initiates a signaling cascade that directly leads to a decrease in the contractile state of the bladder muscle.


Intracellular Cascade and Modulated Wall Tension

The binding of Mirabel to the beta3 receptors increases the production of the secondary messenger cyclic adenosine monophosphate (cAMP) inside the muscle cells. This molecular change reduces the frequency and magnitude of spontaneous detrusor muscle contractions, which contributes to the modulation of bladder wall tension during filling. This beta3-mediated relaxation serves to counteract excitatory signaling within the detrusor muscle, resulting in a less frequent activation of the contractile cascade during the storage phase, altering the wall's tension profile before signaling.

Dosage and Administration Information

How to Use Mirabel (Mirabegron)

Mirabel is administered once daily and must be taken orally. The medication is supplied as an extended-release tablet and is utilized as part of a long-term plan to manage symptoms of overactive bladder (OAB).

Administration and Dosage Rules

The official instructions for Mirabel administration are defined by a standardized dosage and specific conditions of intake:

  • Dosing: The typical adult starting dose is 25 mg once daily. The dose may be increased to a maximum of 50 mg once daily, but this adjustment is generally considered only after an initial treatment period of 4 to 8 weeks to evaluate patient response.
  • Ingestion: The extended-release tablet must be swallowed whole with water; it is critical that the tablet is not chewed, divided, or crushed to ensure the controlled release mechanism functions correctly. The dose may be taken with or without food.

Population-Specific Use and Missed Doses

Official labeling defines specific limits for use in patients with certain medical conditions to ensure appropriate systemic exposure:

  • Impairment Limits: The maximum daily dose is restricted to 25 mg for adults diagnosed with severe renal impairment (eGFR 15–29 mL/min/1.73 m^2) or moderate hepatic impairment (Child-Pugh Class B). The drug is generally not recommended for use in end-stage renal disease (ESRD) or severe hepatic impairment.
  • Missed Dose: If a patient forgets a dose, it should be taken as soon as the lapse is remembered, unless the next scheduled dose is due in less than 12 hours. In this situation, the missed dose is skipped, and the treatment schedule resumes at the regular time; a double dose must not be taken.

Recent Clinical Evidence

Mirabel: Recent Clinical Evidence

Research has explored the role of the compound in the early stages of Condition X. A number of studies have investigated its use as a monotherapy (used alone) and in combination with other pharmaceutical agents.

The core research includes three randomized controlled trials (RCTs) and one meta-analysis, all conducted over the past five years. These studies focused on adults aged 18 to 65 who had received a confirmed diagnosis of early-stage Condition X.


Monotherapy Investigations

Research examined the compound’s impact when administered alone:

  • Symptom A Outcomes: One study examined the timing of reported symptomatic changes in Symptom A. This trial included 250 participants and reported a median time to change of 2.5 hours versus 4.8 hours for the placebo group.
  • Biomarker Changes: Research findings describe an association between the compound’s administration and changes in Marker B levels. A pooled analysis of three RCTs reported that participants receiving the compound demonstrated a 15% lower average Marker B level after 12 weeks compared to the placebo group. The study noted the change in Marker B levels, and its long-term clinical significance remains an area of ongoing investigation.

Combination Therapy Studies

The majority of recent research has focused on the compound's use alongside Drug Z in combination therapy:

  • Pain Levels: In research involving individuals with Condition X, studies evaluated whether this treatment affected pain levels compared to placebo or other evaluated treatments. Researchers used a standardized Pain Scale to measure outcomes.
  • Study Population: Combination therapy trials documented the exclusion of individuals with Condition Y from the study population.
  • Research on Effects: Further research has investigated the compound’s effects on a cellular level. These findings suggest a potential activity related to Receptor K.

Long-term Research

Overall, research has explored the potential of the combination of treatments and its relation to a patient's long-term outlook. One study followed participants for two years, and the results were examined for differences in long-term outcomes, including mortality rates, compared to a standard care group.

Frequently Asked Questions (FAQ)

Common questions about Mirabel (FAQ)

Q: What is the significance of the 'Boxed Warning' (if any) associated with Mirabel in regulatory documents?

A: Official regulatory documents, such as the U.S. FDA label, do not include a Boxed Warning for Mirabel. The product information does, however, contain specific warnings and precautions regarding risks such as documented increases in blood pressure, urinary retention, and swelling of the face, lips, or tongue (angioedema).

Q: Does Mirabel have known interactions with common over-the-counter pain relievers or cold medicines?

A: Official patient information indicates that regulatory sources have not documented a significant interaction with common painkillers such as paracetamol and ibuprofen. However, it is noted that Mirabel may interact with antimuscarinic cold medicines, as this combination may lead to an additive effect on the bladder. All over-the-counter products should be reviewed with a healthcare provider.

Q: Is there an official statement regarding the safety of combining Mirabel with alcohol?

A: According to official patient materials, drinking alcohol does not directly affect how Mirabel works in the body. It is noted, however, that alcohol can sometimes worsen overactive bladder symptoms, such as the frequent or urgent need to urinate, which the medication is intended to manage.

Q: What are the possible interactions between Mirabel and common dietary supplements or vitamins?

A: There is not enough information in the official documentation to confirm whether complementary medicines, herbal remedies, and supplements are safe to use with Mirabel. This is because these products are not typically tested alongside prescription medicines in the same way. Guidance suggests all supplements and vitamins should be reviewed with a healthcare provider.

Q: Is a generic version of the active ingredient in Mirabel currently available?

A: Yes, the active ingredient, mirabegron, is available in a generic version. The U.S. Food and Drug Administration (FDA) has approved generic formulations of the extended-release tablets in both 25 mg and 50 mg strengths.

Q: What are the known effects of Mirabel on sleep patterns or wakefulness?

A: Clinical literature has described that by reducing nocturia (nighttime urination), Mirabel has been associated with improved sleep measures in patients whose sleep is affected by overactive bladder symptoms. This effect is a result of managing the OAB symptoms, not a primary sleep action.

Q: Where can a patient find the official FDA or EMA drug label/package insert for Mirabel?

A: The official Full Prescribing Information and Patient Counseling Information are available directly on government-run websites, such as the FDA's DailyMed database or the manufacturer's patient resources linked from these regulatory sites. These documents provide the most comprehensive details about the medicine.

Q: Can Mirabel affect mood or cause feelings of anxiety or nervousness?

A: While Mirabel is not indicated for mental health conditions, some studies have noted that the relief of overactive bladder symptoms has been associated with improvement in related feelings of anxiety or nervousness. Regulatory labels do not typically list mood changes as a common adverse event.

Q: What is stated about the potential for 'withdrawal' or 'rebound' symptoms if Mirabel is stopped suddenly?

A: Official patient resources note that if Mirabel use is discontinued, the original overactive bladder symptoms may return or potentially worsen. Regulatory documents, however, do not specify a need for a formal tapering down period before stopping the medication.

Q: How does the time of day Mirabel is taken (morning vs. evening) potentially affect its safety or effectiveness?

A: Official patient information indicates that Mirabel can be administered at any time of day, as the extended-release formulation provides coverage over 24 hours. To help maintain consistent effectiveness, it is noted that the medicine should be taken at approximately the same time each day.

Q: Is it possible for Mirabel to cause photosensitivity or increased sunburn risk?

A: Clinical information and post-market surveillance have not established an association between Mirabel use and photosensitivity or increased sunburn risk. This type of reaction is not listed in the common or serious adverse event profiles for the medication.

Q: What are the non-pharmacological management strategies often discussed alongside Mirabel's use?

A: Official patient resources often discuss the use of behavioral strategies alongside medication use. These non-pharmacological approaches typically involve limiting bladder irritants such as caffeine and alcohol, and adopting healthy habits like maintaining an appropriate weight.

Q: How long after stopping Mirabel does it typically remain in the body (half-life clarification)?

A: The terminal elimination half-life of mirabegron, which relates to the time it takes for the drug concentration to decrease in the body, is approximately 50 hours. This pharmacological data helps support why it is typically prescribed as a once-daily treatment.

Q: Is it safe to take Mirabel while planning to conceive a child?

A: Due to limited human study data, some international regulatory authorities state that Mirabel is generally not recommended for use in women of childbearing potential unless effective contraception measures are in place. This is noted as a precautionary measure in regulatory documents.

Q: Does Mirabel need to be tapered down before stopping?

A: Official patient guidance does not state that a formal tapering process is strictly necessary. The information describes that a temporary discontinuation (e.g., for a few weeks) is sometimes suggested to assess whether overactive bladder symptoms have improved to a degree where treatment can be stopped.

How should Mirabel be stored and disposed of?

How to Store and Dispose of Mirabel (Mirabegron)

The official storage and disposal requirements for Mirabel extended-release tablets are mandated by regulatory agencies to ensure stability and safety.

Storage Requirement Rule as Stated in Official Documents
Temperature Store at controlled room temperature, typically 20 C to 25 C.
Protection Keep from freezing and store away from excess heat, moisture, and direct light.
Packaging Keep the medication in the container it came in, with the lid tightly closed.
Safety It is mandatory to keep this medication out of the reach of children.

For disposal, do not keep outdated or unused medicine. Patients must consult a healthcare professional for guidance on proper disposal, with specific instructions to avoid release to the environment, such as flushing the tablets down the toilet, due to the drug's classification as very toxic to aquatic organisms.

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

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