Mirtor

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Mirtor

Medically reviewed

Marina Burgos

Last updated on 22/12/2025

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

Overview of Mirtor

What is Mirtor? Defining the Drug's Identity

Mirtor is a prescription-only medication whose active ingredient is Mirtazapine. It is a synthetic pharmaceutical agent belonging to the class of antidepressants, specifically known for its unique profile as an atypical, tetracyclic compound.

Property Description
Active ingredient Mirtazapine
Form Film-coated tablets, Orally Disintegrating Tablets (SolTab)
Pharmacological class Atypical Antidepressant, NaSSA
Common use (General) Supporting mood stabilization and emotional regulation
Origin Synthetic (chemically synthesized)

Mirtazapine: A Specific Antidepressant Class

Mirtazapine is officially classified as a Noradrenergic and Specific Serotonergic Antidepressant (NaSSA), a designation that sets it apart from selective serotonin reuptake inhibitors (SSRIs). Its mechanism does not rely on reuptake inhibition; instead, it utilizes selective antagonism to block specific inhibitory receptors in the central nervous system, including the alpha2-adrenergic autoreceptors.

Pharmacological studies have clinically recognized this dual mechanism for its ability to enhance the activity of both noradrenaline and serotonin signaling. This unique action profile is a valuable tool for regulating mood, often making it a choice for adults whose symptoms of emotional dysregulation include prominent sleep disturbance or anxiety.


Composition and Differentiating Forms

Mirtor is a single active ingredient product, meaning its therapeutic effect is delivered entirely by Mirtazapine. It is formulated for oral administration in two main types: the standard film-coated tablets and the orally disintegrating tablets (SolTab).

The composition uses the active compound embedded in a solid dosage matrix alongside essential inactive ingredients. The orally disintegrating form represents a key distinguishing feature for patient administration, as it is engineered to dissolve on the tongue without the need for water, providing a unique patient-friendly option.

What side effects are possible with Mirtor?

Possible Side Effects and Safety Information

The safety profile of Mirtor (Mirtazapine) is officially documented by government regulatory agencies (e.g., FDA, EMA) based on clinical data and post-marketing surveillance. This profile details the potential adverse reactions, required safety constraints, and population-specific considerations.

Frequency-Classified Adverse Reactions

The most common adverse reactions reported in clinical trials and listed in regulatory documents include effects on the central nervous and metabolic systems:

Classification Key Adverse Reactions (Regulatory)
Very Common (ge1 in 10) Somnolence/Drowsiness, Increased Appetite, Dry Mouth, Weight Gain
Common (le1 in 10) Dizziness, Constipation, Asthenia (Weakness)

Serious Adverse Reactions and Regulatory Warnings

Official labeling highlights severe, clinically significant adverse events that require immediate attention. These events include:

  • Suicidal Thoughts and Behaviors: The label includes a warning regarding an increased risk of suicidal thoughts and behaviors, particularly in children, adolescents, and young adults (under age 25), especially during the initial months of treatment and following dose changes. Mirtor is not approved for pediatric patients.
  • Serotonin Syndrome: A potentially life-threatening reaction, the risk of which increases when taken with other serotonergic medications. Symptoms can include agitation, hallucinations, fever, and muscle stiffness.
  • Agranulocytosis: A rare but serious reduction in white blood cells. Treatment must be discontinued if signs of infection (fever, sore throat) develop.
  • Severe Cutaneous Adverse Reactions (SCARs): Including Stevens-Johnson Syndrome (SJS), Toxic Epidermal Necrolysis (TEN), and Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS).

Safety-Related Restrictions

  • Contraindication: Mirtor is strictly contraindicated for use with a Monoamine Oxidase Inhibitor (MAOI), or within 14 days of stopping an MAOI, due to the risk of Serotonin Syndrome.
  • Special Populations: The total body clearance of Mirtazapine is reduced in patients with moderate to severe renal or hepatic impairment, requiring careful consideration. The orally disintegrating tablets contain phenylalanine (a component of aspartame), which is a restriction for patients with Phenylketonuria (PKU).

This structured safety information provides a factual, regulatory basis for understanding Mirtor's risk profile, distinguishing common metabolic and nervous system effects from rare, but critical, safety warnings and constraints.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory profile for Mirtor overdose is defined by specific clinical signs and mandatory emergency procedures. Suspected overdose requires immediate medical attention.

Documented Clinical Signs and Manifestations

Overdose manifestations reported in regulatory documentation, particularly with Mirtazapine alone, include central nervous system effects such as disorientation, drowsiness, impaired memory, and reduced consciousness level. Tachycardia (fast heart rate) is also a documented clinical sign. While some reports suggest single-agent overdose is associated with mild CNS depression, the potential for severe outcomes warrants caution.

Serious Risks and Help-Seeking Requirements

Serious outcomes, including fatalities, have been documented, primarily associated with mixed overdoses (Mirtor taken with other pharmacological agents). Postmarketing reports specifically highlight the cardiovascular risks of QT prolongation and Torsades de Pointes. Urgent medical help is required due to the potential for such severe consequences. Treatment consists of general measures employed in the management of overdose with any drug for Major Depressive Disorder.

Mandated Supportive Management

No specific antidote is known for Mirtor overdose. Management is strictly symptomatic and supportive, focusing on maintaining physiological stability. Mandated actions include ensuring an adequate airway, oxygenation, and ventilation, alongside continuous monitoring of cardiac rhythm and vital signs. The clearance of Mirtazapine is decreased in patients with hepatic or renal insufficiency, which is noted as a factor relevant to the patient's overall management in an overdose situation.

Therapeutic Uses of Mirtor

What Mirtor Treats: Main Uses and Benefits

Mirtor is a prescription medication considered relevant for managing symptoms associated with Major Depressive Disorder (MDD) in adults. Its indication is for treating the core depressive illness. It is applied across conditions characterized by episodic or chronic symptom patterns. The overall therapeutic goal is to provide support that helps ease the overall symptom burden.

It is commonly used to help with symptomatic relief across key domains, including symptoms related to core emotional function, sleep disturbances, and anxiety symptoms. Additionally, it helps manage decreased appetite and unintentional weight loss.

“This supportive effect on both mood and appetite contributes to easing the overall symptom load during episodes of heightened discomfort.”

Quick Fact: Relief for Sleep and Appetite
Mirtor is generally used when additional symptomatic support is appropriate to address symptoms that may become intense or disruptive, such as insomnia and poor nutritional intake co-occurring with clinical depression.

Core Mood and Emotional Stabilization

This domain is relevant for managing groups of symptoms that may become intense or disruptive, including feelings of sadness, loss of interest, and emotional fluctuation. Mirtor is considered relevant for easing symptoms across periods of heightened discomfort associated with depressive episodes.

Targeted Relief for Sleep and Anxiety Symptoms

Mirtor is commonly used in clinical settings that involve acute or unstable symptom patterns, such as co-occurring insomnia and anxiety. It is relevant for managing symptoms that interfere with daily comfort, which may assist with symptomatic relief.

Support for Appetite and Physical Health

The medication is commonly used when symptoms of depression include a pronounced decrease in appetite and unintentional weight loss or low body mass index. This supportive application is relevant in situations where additional management of discomfort is required due to nutritional deficits.

Eligibility and Restrictions for Use

The official regulatory profile for Mirtor (Mirtazapine) strictly defines the eligible patient population, primarily through absolute contraindications and age restrictions.

Populations Excluded or Restricted

Contraindications (Must Not Use):

  • Patients with a known hypersensitivity or allergy to Mirtazapine or its excipients.
  • Patients taking, or within 14 days of discontinuing, a Monoamine Oxidase Inhibitor (MAOI) intended for psychiatric disorders.

Age-Related Eligibility:

  • Mirtor is indicated for use only in adults (18 years and older).
  • Use is not approved and not recommended for children and adolescents, as efficacy and long-term safety concerning development have not been established in this age group.

Conditional Use (Caution Required):

  • Organ Impairment: Caution is required for patients with moderate to severe hepatic (liver) or renal (kidney) impairment, as regulatory data shows drug clearance is reduced.
  • Comorbidities: Caution and close monitoring are necessary for patients with a history of mania/hypomania or seizures/epilepsy.
  • Pregnancy/Lactation: Use during pregnancy should occur only if clearly needed. Caution is advised during breastfeeding.

What should I know about interactions with other medicines?

Mirtor Interactions with other medicines and products

Official regulatory documents require specific management of Mirtor when co-administered with certain drug classes, primarily based on pharmacokinetic and pharmacodynamic interactions.

Interacting Product Category Restriction or Management Requirement
Monoamine Oxidase Inhibitors (MAOIs) Concomitant use is Contraindicated. A minimum 14-day gap must separate the discontinuation of an MAOI (including linezolid and intravenous methylene blue) and the initiation of Mirtor, and vice-versa.
Strong CYP3A Inducers Dosage of Mirtor may require increase with concomitant use of agents like carbamazepine, phenytoin, or rifampin. Conversely, the Mirtor dosage may need to be decreased upon discontinuation of the inducer.
Strong CYP3A Inhibitors Dosage of Mirtor may require decrease with concomitant use of agents like ketoconazole or clarithromycin. Conversely, the Mirtor dosage may need to be increased upon discontinuation of the inhibitor.
Other Serotonergic Drugs Use with agents such as SSRIs, SNRIs, and triptans requires patient monitoring for the emergence of serotonin syndrome.
Warfarin International Normalized Ratio (INR) should be monitored closely during concomitant use, as Mirtor can affect prothrombin time.

These interactions are formally documented because Mirtor is metabolized by several cytochrome P450 enzymes (CYP1A2, CYP2D6, and CYP3A4). Therefore, drugs that induce or inhibit these enzymes may significantly alter the concentration of Mirtor in the bloodstream, necessitating dosage adjustments to maintain safety and effectiveness.

Mechanism of Action

The action of Mirtazapine is defined by its pharmacological classification as a Noradrenergic and Specific Serotonergic Antidepressant ( NaSSA), employing a multi-target receptor antagonism to modulate key brain signaling pathways.


Dual Action: Enhancing Noradrenaline and Serotonin Release

The molecule acts as an antagonist at the presynaptic alpha2-adrenergic receptors. By blocking these receptors, Mirtazapine disables the neuron's natural inhibitory feedback loop, leading to a dual increase in the synaptic availability of both Noradrenaline ( NE) and Serotonin ( 5-HT). This action engages mechanisms that modulate overactive or dysregulated signaling processes, contributing to neurochemical modulation within central regulatory circuits.


Selective Serotonin Channeling and Systemic Effect

Mirtazapine simultaneously blocks the postsynaptic Serotonin 5 -HT2 and 5 -HT3 receptors. This selective antagonism ensures that the increased Serotonin is channeled toward the 5 -HT1 A receptors, modifying the signaling sequences that shape systemic physiological outcomes. The blockade of 5 -HT3 receptors also modulates pathways involved in gastrointestinal signaling.


Modulation of Central Arousal

A distinct mechanistic domain involves antagonism of the central Histamine H1 receptors. This action directly affects the neural pathways governing wakefulness and alertness, resulting in a physiological consequence of decreased central arousal and modulating the metabolic signaling pathways associated with appetite drive.

Dosage and Administration Information

Mirtor, which contains the active substance mirtazapine, is an antidepressant medication used to treat major depressive disorder in adults. It is essential to follow the specific instructions and dosage prescribed by your healthcare provider.

Administration and Timing

  • Mirtor is typically taken once a day, preferably in the evening just before sleep. This timing is generally recommended due to the potential for sedation associated with the drug.
  • The medication can be taken with or without food.
  • If your dosage is divided into two daily doses, the smaller dose is usually taken in the morning, and the larger dose is taken at night.

Dosage

  • The recommended starting dose for adults is generally 15 mg daily.
  • Your doctor may adjust the dose up to a maximum of 45 mg per day, with dose changes occurring no more frequently than every one to two weeks to allow for proper evaluation of your response.
  • Patients with renal or hepatic impairment may require a lower initial dosage and closer monitoring due to reduced clearance of the drug.

Important Considerations

  • Orally Disintegrating Tablets (Mirtor SolTab): These tablets should be handled with dry hands and removed immediately before use by gently peeling back the foil—do not push the tablet through the foil. Place the tablet on the tongue to dissolve, and swallow with saliva; no water is needed. The tablet should not be split or broken.
  • Missed Dose: If you take the medication once daily and miss a dose, skip the missed dose and resume your regular schedule. Do not take a double dose to compensate.
  • Stopping Treatment: Do not suddenly stop taking Mirtor. Treatment should be discontinued gradually under the guidance of a healthcare professional to minimize the risk of withdrawal symptoms and relapse.

Recent Clinical Evidence

Recent clinical research on Mirtor (mirtazapine) primarily confirms its established efficacy in Major Depressive Disorder (MDD) and highlights its distinct profile regarding sleep and tolerability.

Efficacy in Depression

Overall evidence, including systematic reviews and meta-analyses, suggests that mirtazapine is comparable in efficacy to other common antidepressants, such as selective serotonin reuptake inhibitors (SSRIs). However, some analyses indicate a potential faster onset of action in reducing depressive symptoms, especially in the first one to two weeks of treatment, compared to certain SSRIs. Furthermore, mirtazapine has shown to be effective across various symptom domains, including depression accompanied by anxiety and sleep disturbances.

Benefits for Sleep and Insomnia

A notable area of focus in recent clinical trials is mirtazapine’s effect on sleep. Due to its potent antihistamine and certain receptor blocking properties, mirtazapine is consistently shown to have sleep-promoting effects in patients with MDD. Studies indicate that it can reduce the time it takes to fall asleep and improve total sleep time and sleep quality. In patients whose depression includes prominent insomnia, mirtazapine may offer a dual benefit, leading to significant improvements in both depression and sleep parameters. It is also used off-label for chronic insomnia, with some trials in older adults showing short-term improvement in insomnia severity.

Tolerability and Combination Therapy

In terms of tolerability, mirtazapine is often associated with a lower risk of common SSRI-related side effects like sexual dysfunction and nausea. Conversely, it carries a higher risk of sedation, increased appetite, and subsequent weight gain. Emerging evidence also explores its use as an augmentation strategy—adding mirtazapine to an SSRI or SNRI when monotherapy has failed to achieve an adequate response—with some studies indicating a potential for enhanced clinical response and remission rates, though this may come with a higher overall side-effect burden.

Frequently Asked Questions (FAQ)

Common questions about Mirtor (FAQ)

Q: What should I do if I forget to take my Mirtor dose?

Official patient information advises that if a dose is missed while on a once-daily schedule, the missed dose should be skipped, and the medication resumed on the next regular schedule. Taking a double dose to compensate for a missed dose is not recommended. If a patient is on a divided dosage (more than once per day) or is uncertain what to do, it is appropriate to contact a healthcare provider for specific advice.


Q: How do I properly take the orally disintegrating tablet (SolTab)?

According to the official product information, the orally disintegrating tablet (SolTab) should be handled with dry hands. Once removed from the blister pack, the tablet should be placed on the tongue, where it will rapidly dissolve. The dissolved medication can then be swallowed with saliva, and no additional water is required. The tablet is intended to be used immediately upon removal and should not be split or broken.


Q: Is it safe to drink alcohol while taking Mirtor?

Regulatory documents state that the impairment of motor skills and cognitive abilities caused by Mirtor may be increased when combined with alcohol. Official guidance advises patients to avoid consuming alcohol while taking this medication. The combination can lead to amplified central nervous system (CNS) effects.


Q: How quickly does Mirtor start working for depression?

Studies and official information indicate that patients may begin to notice an improvement in their depressive symptoms within the first one to four weeks of treatment. Even if improvement is seen early, it is important for patients to continue taking the medication exactly as prescribed to achieve the full therapeutic effect.


Q: What is the difference between Mirtor and common SSRIs like Zoloft?

Mirtor is classified in regulatory documents as a Noradrenergic and Specific Serotonergic Antidepressant (NaSSA), meaning its action involves blocking specific receptors in the brain to increase neurotransmitter activity. This is different from Selective Serotonin Reuptake Inhibitors (SSRIs), whose primary mechanism is the inhibition of serotonin reuptake. This difference in classification results in distinct pharmacological and clinical profiles.


Q: Can I use Mirtor for a condition other than major depression?

The official indication for Mirtor, according to regulatory documents, is strictly for the treatment of Major Depressive Disorder (MDD) in adults. The decision to use this medication for an unapproved condition is a clinical decision that requires consultation with a healthcare professional.


Q: Are there any known foods or beverages I should avoid while on Mirtor?

Official product information states that Mirtor can be taken with or without food, as the absorption of the drug is minimally affected by the presence of food. However, patients are advised to avoid consuming alcohol while taking this medication due to the risk of additive central nervous system (CNS) effects.


Q: What happens if I take too much Mirtor (overdose)?

Symptoms reported in cases of overdose include disorientation, drowsiness, impaired memory, and a rapid heartbeat (tachycardia). In the event of suspected overdose, contacting a doctor or poison control center immediately, or seeking urgent care at an emergency room, is necessary. While effects are often reported as mild, severe outcomes and fatalities have been reported.

How should Mirtor be stored and disposed of?

The storage and disposal of Mirtor (mirtazapine) must adhere strictly to the conditions specified in official regulatory labeling.

Required Storage Conditions

Mirtor tablets must be stored at controlled room temperature, defined as 20°C to 25°C (68°F to 77°F). It is required to keep the medicine out of the sight and reach of children and to store it in the original container.

To preserve product stability, Mirtor must be protected from light and moisture. Tablets must not be refrigerated or frozen.

Handling and Disposal

Orally disintegrating tablets (ODT) must be used immediately upon removal from the blister pack and should not be stored after opening.

Disposal of any unused or expired product must be in accordance with local requirements. The officially preferred disposal method is using a drug take-back program. Medication should not be flushed down the toilet or poured down a drain.

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

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