Mitrazin

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Mitrazin

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 Mitrazin

Property Description
Active ingredient Mirtazapine
Form Tablet, Orally disintegrating tablet, Oral solution
Pharmacological class Noradrenergic and Specific Serotonergic Antidepressant (NaSSA)
General purpose Mood stabilization and relief of depressive symptoms
Origin Synthetic

Mitrazin is a synthetic, prescription-only medication classified as an antidepressant, used to help stabilize and elevate mood in adults. Its active component is the single small molecule compound Mirtazapine. Mirtazapine is functionally categorized as a Noradrenergic and Specific Serotonergic Antidepressant (NaSSA), a unique classification supported by pharmacological properties. This dual-action mechanism differentiates it from selective reuptake inhibitors, a feature noted for its potential benefit in patients requiring a distinct mode of action for managing depressive illness.


Composition and Available Forms

Mitrazin is a single product containing only the active ingredient Mirtazapine. The chemical structure of this compound is designated by the formula C17H19N3. It is formulated for oral administration and is manufactured in several primary dosage forms to suit patient needs. These forms include the conventional oral immediate-release tablet, the rapidly dissolving orally disintegrating tablet (SolTab), and an oral solution or liquid preparation. The availability of the orally disintegrating tablet is a distinguishing factor, providing an alternative for patients who have difficulty swallowing.


General Purpose and Function

Mirtazapine utilizes a dual-action mechanism in the treatment of major depressive disorder. The general purpose of Mirtazapine is to rebalance key chemical messengers in the central nervous system to support emotional stability. It achieves this by acting as a targeted blocker of specific receptors, which in turn leads to a substantial, specific increase in the release of both Serotonin and Norepinephrine. Mirtazapine works to restore the balance of these natural substances in the brain. This focused dual mode of action on these two neurotransmitter systems is essential for Mitrazin's general benefit, helping to relieve the emotional and physical components associated with a dysregulated mood state.

Regulatory References

  1. NIH MedlinePlus Mirtazapine
  2. NIH MedlinePlus Mirtazapine Drug Information

What side effects are possible with Mitrazin?

Mitrazin's safety profile, based on official regulatory documents, details adverse reactions organized by frequency and the body system affected. These classifications establish the risk profile without providing instructional advice.

Frequency-Classified Adverse Reactions

Adverse reactions are formally categorized in regulatory labeling:

  • Very Common (ge 1/10): Somnolence (drowsiness), increased appetite, weight gain, and dry mouth.
  • Common (ge 1/100 to < 1/10): Dizziness, lethargy, constipation, and peripheral edema.
  • Rare (ge 1/10,000 to < 1/1,000): Mania and elevated serum transaminases (liver enzymes).
  • Frequency Not Known: Serotonin Syndrome and severe cutaneous adverse reactions.

These effects primarily involve the Nervous System Disorders and Metabolism and Nutrition Disorders as defined by official System-Organ-Class groupings.


Serious Adverse Reactions and Safety Constraints

Specific risks are highlighted in official documents. The FDA label includes a Boxed Warning regarding the increased risk of suicidal thoughts and behavior in children, adolescents, and young adults (under 25), particularly during the initial months of treatment and following dose adjustments. Other serious, rare events documented include Agranulocytosis (a severe reduction in white blood cells) and Serotonin Syndrome when used with other serotonergic agents.

Clearance of the drug is reduced in individuals with hepatic or renal impairment, requiring a safety consideration for these populations. Sedation and postural hypotension are noted as being more common during the initial phases of treatment.

Overdose and Emergency Response

Overdose and When to Seek Help

Overdose with Mitrazin (Mirtazapine) alone typically results in relatively mild symptoms, primarily affecting the central nervous system. Common presentations include drowsiness, disorientation, prolonged sedation, and tachycardia (a fast heartbeat), along with mild high or low blood pressure. Treatment generally focuses on providing supportive care and managing symptoms.

However, immediate medical attention is required in certain situations. The risk of serious outcomes, including fatalities, increases significantly with very high dosages or in cases of a mixed overdose (ingestion with other substances). In such severe cases, serious cardiac events like QT prolongation and a life-threatening irregular heartbeat called Torsade de Pointes have been reported.

When to Call for Emergency Help

Urgent medical assessment is mandatory if you experience:

  • Signs of clinical worsening or suicidal thoughts/behavior, especially during the initial months of treatment or following a dose change.
  • Symptoms of Serotonin Syndrome, which may include confusion, agitation, hallucinations, shivering, muscle rigidity, rapid heart rate, or unexplained high fever.
  • Any of the severe symptoms associated with large or mixed overdoses, such as severe dizziness, fainting, or chest discomfort.

Activated charcoal may be administered in a healthcare setting to help absorb the drug following an overdose. If an overdose is suspected, contact emergency services immediately, and provide all information about the amount taken and any other co-ingested agents.

Therapeutic Uses of Mitrazin

What Mitrazin Treats: Main Uses and Benefits

Mitrazin is primarily used to provide essential supportive symptomatic relief in clinical settings marked by heightened patient distress, and generally assists with the symptom load. In clinical practice, the medication is applied across therapeutic domains to manage conditions associated with acute or disruptive symptom patterns, primarily Major Depressive Disorder.


It is commonly used to help manage symptom clusters that create noticeable functional strain, including core emotional manifestations (like persistent sadness and depressed mood), pronounced sleep disturbances, and symptoms related to diminished appetite. Mitrazin may be considered relevant when additional symptomatic support is needed in contexts involving episodic or fluctuating manifestations.

“Mitrazin may be part of symptomatic management, assisting with functional stability when symptoms interfere with routine activities.”

Quick Fact: Relief for Sleep and Appetite

Quick Fact: Relief for Sleep and Appetite Mitrazin contributes to improved comfort during symptomatic periods by providing the practical benefit of assisting with more stable sleep patterns and may assist with managing symptoms related to diminished appetite in relevant patient groups.

Eligibility and Restrictions for Use

Mitrazin is officially authorized for use only in adults (18 years and older). Regulatory documentation strictly defines eligibility based on absolute contraindications and patient clinical characteristics.

Populations Excluded or Restricted

Use of this medicine is contraindicated in patients with a known hypersensitivity to mirtazapine or its excipients. It is also prohibited for patients who are currently taking, or have stopped taking within the last 14 days, a Monoamine Oxidase Inhibitor (MAOI).

Age and Organ Function Limits

Safety and efficacy have not been established in the pediatric population; the medicine is not approved for children and adolescents under 18 years of age. Caution is indicated in older adults. Caution is also necessary in patients with moderate to severe renal or hepatic impairment because drug clearance is reduced in these conditions.

Conditional Use

Eligibility status is further defined by reproductive health and specific comorbidities. Use during pregnancy is advised only if clearly needed. Mirtazapine is excreted into human milk, necessitating that breastfed infants be monitored. Caution is additionally required for patients with a history of mania or hypomania, seizure disorders, and conditions like angle-closure glaucoma.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Mitrazin is contraindicated (must not be taken) with Monoamine Oxidase Inhibitors (MAOIs), including the medicines linezolid and intravenous methylene blue. A period of at least 14 days must pass between stopping an MAOI and starting Mitrazin, or vice-versa, due to the high risk of serotonin syndrome.

The risk of serotonin syndrome is also increased when Mitrazin is combined with other serotonergic drugs, such as triptans, tricyclic antidepressants, fentanyl, tramadol, lithium, buspirone, tryptophan, and the herbal product St. John’s Wort. Close monitoring for symptoms like agitation, confusion, or muscle rigidity is required with such combinations.

Mitrazin's concentration in the body can be affected by medicines that influence liver enzymes. Strong CYP3A inhibitors (e.g., ketoconazole, clarithromycin, cimetidine) can increase Mitrazin levels, possibly requiring a lower dosage. Conversely, strong CYP3A inducers (e.g., carbamazepine, phenytoin, rifampin) can decrease Mitrazin levels, potentially necessitating a higher dosage.

Combining Mitrazin with alcohol or other CNS depressants, like benzodiazepines (e.g., diazepam, alprazolam), may increase sedative effects and severely impair motor and cognitive function, and should be avoided. Caution is also advised when taking medicines that prolong the QTc interval due to an increased risk of heart rhythm problems. Finally, use with warfarin may require monitoring of the International Normalized Ratio (INR).

Mechanism of Action

Dual Monoamine Release via Alpha-2 Blockade

Mitrazin's primary action is the antagonism of presynaptic Alpha-2 adrenergic receptors. By blocking these inhibitory receptors, the drug disables the neuron's natural negative feedback mechanism, which directly and specifically leads to a simultaneous increase in the release of both Norepinephrine and Serotonin into the synaptic cleft. This domain increases the effective synaptic concentration of both core chemical messengers in the central nervous system.


Serotonin Receptor Control and Specific Channeling

In addition to enhancing release, Mitrazin acts as an antagonist at postsynaptic Serotonin 5-HT2 and 5-HT3 receptors. This control redirects the increased Serotonin primarily towards the 5-HT1 A receptors, resulting in a targeted, specific enhancement of 5-HT1 A-mediated signaling. This mechanism influences pathways controlled by these specific receptor subtypes, which include satiety and sleep-wake cycle signaling.


Central Histamine H1 Receptor Inhibition

Mitrazin has a high affinity for and acts as an antagonist at the central Histamine H1 Receptors. This blockade directly interferes with the histaminergic system, which plays a major role in wakefulness and arousal. This distinct mechanistic domain contributes to a strong H1-mediated alteration of central arousal states.

Dosage and Administration Information

How Mitrazin is Used

Mitrazin is administered strictly via the oral route and is manufactured in several forms, including conventional tablets and orally disintegrating tablets (ODTs). The medicine is taken once daily, with administration recommended in the evening prior to sleep. It may be consumed with or without food.

Dosing and Titration Protocol

The standard regimen begins with a recommended starting dose of 15 mg once daily. The dose is typically adjusted based on response, with the effective daily range being from 15 mg up to a maximum of 45 mg per day. Dose adjustments should adhere to a minimum interval of one to two weeks to allow for adequate evaluation of the patient’s response.

Dosage Parameter Dosage Details
Starting Dose 15 mg once daily
Maximum Dose 45 mg per day
Titration Interval Minimum 1 to 2 weeks

For administration, conventional tablets must be swallowed whole with fluid. Orally disintegrating tablets should be placed on the tongue to dissolve with saliva, and they do not require water. The ODT formulation must be handled using dry hands.

Use Duration and Adjustments

Treatment duration for the primary indication is advised to continue for a period of at least six months after the patient is free of symptoms. When discontinuing the medicine, a gradual dose reduction (tapering) is practiced. Furthermore, a dosage decrease may be necessary for individuals with moderate to severe renal or hepatic impairment due to reduced drug clearance. The medicine is not approved for use in the pediatric population (under 18 years of age).

Recent Clinical Evidence

Evidence for Use in Major Depressive Disorder (MDD)

The primary research for Mirtazapine (Mitrazin) consists of short-term randomized controlled trials (RCTs). These studies included adult outpatients and compared Mirtazapine against an inactive placebo or other active comparators. Researchers examined changes in depression symptom severity using tools like the HDRS and MADRS, reporting measurements of symptom change over observation periods typically lasting six to twelve weeks.

The findings describe patterns related to achieving predefined levels of clinical response or remission, contributing insight into short-term changes in the observed populations. The focus of these core trials was primarily on the acute, or short-term, phase of treatment.

Evidence Regarding Associated Symptoms

Mirtazapine was also evaluated in relation to prominent symptoms often experienced by patients with MDD. Studies specifically monitored outcomes related to physical discomfort, such as pronounced sleep disturbances and changes in appetite. Researchers examined how Mirtrazapine was evaluated in relation to these symptoms, monitoring observed changes during the treatment phase.

Augmentation and Research Gaps

The compound was studied as an augmentation (add-on) strategy in patients whose depression was classified as treatment-resistant, meaning they had not responded adequately to a single prior antidepressant. Findings from these augmentation trials were varied.

The majority of research evidence has follow-up durations that were limited, and long-term outcomes are not well characterized. Data are still emerging, and there is limited information for long-term outcomes beyond one year. Scientific reviews note that the consistency of the available data remains low for the treatment-resistant augmentation strategy, and data for specific patient groups, such as those with complex health conditions, remain insufficient.

Key Studies & References Depression in adults: recognition and management (NICE Guideline NG222, used for clinical context of TRD strategies)

Frequently Asked Questions (FAQ)

Common questions about Mitrazin (FAQ)

Q: Is it generally safe to drive or operate machinery while using Mitrazin?

A: Regulatory documents state that Mitrazin may cause somnolence (drowsiness) and impair a person’s judgment, thinking, and motor skills. Official guidance advises that driving or operating heavy machinery should be avoided until the effects of the medicine are fully known.


Q: Does Mitrazin cure a condition or only help manage symptoms?

A: Mitrazin is indicated for the treatment of Major Depressive Disorder (MDD). It works by rebalancing certain brain chemicals to help relieve the emotional and physical components associated with a dysregulated mood state, thus serving as a means of symptom management for the condition.


Q: Is Mitrazin considered to have potential for physical dependence or addiction?

A: Official status reports indicate that mirtazapine is not classified as a controlled substance because it is considered to have a low potential for abuse or dependence. However, official product information advises that the medicine should not be stopped suddenly, as this may lead to discontinuation (withdrawal) symptoms.


Q: How long does it usually take for a person to notice the intended effects of Mitrazin?

A: Official information indicates that initial benefits, such as improvement in sleep, may be noted within the first one to two weeks. However, the full intended effects on mood usually take four to eight weeks or longer to become fully evident.


Q: What are the signs of a possible allergic reaction to Mitrazin?

A: Severe, rare adverse reactions have been documented in official product information. These include Agranulocytosis, with signs like a sore throat or fever, and Drug Reaction with Eosinophilia and System Symptoms (DRESS), which is a severe skin reaction.


Q: Why do official documents sometimes warn against using Mitrazin with grapefruit?

A: Regulatory documents warn that strong inhibitors of the CYP3A enzyme can increase Mitrazin's concentration in the body. Since grapefruit and its juice can affect the body’s metabolism through this same enzyme, use may lead to higher concentrations of the medicine in the body.


Q: Is Mitrazin known by different brand names in other countries?

A: Yes, the active ingredient, mirtazapine, is marketed globally under several different brand names. Examples include Remeron in the US and Canada, and Avanza in Australia.


Q: Is Mitrazin appropriate for older adults or seniors?

A: Official guidance indicates that caution is necessary when prescribing Mitrazin for older adults. This is because pharmacokinetic studies show the body may clear the drug at a reduced rate, and dosage adjustments may be necessary.


Q: Can people with liver or kidney problems use Mitrazin?

A: Yes, but official documents advise caution for individuals with moderate to severe hepatic (liver) or renal (kidney) impairment. Dosage adjustments may be required by a prescribing physician due to the reduced clearance of the medicine in these populations.


Q: What is the safety classification for Mitrazin during pregnancy or breastfeeding?

A: Official product information states that mirtazapine is excreted into human milk. Use during pregnancy or breastfeeding requires evaluation by a healthcare provider to weigh the clinical need of the medicine against potential risk.


Q: What is the recommended approach if Mitrazin does not seem to be effective after several weeks?

A: Official guidance specifies that dosage adjustments should be strictly adhered to with a minimum interval of one to two weeks. If a response remains inadequate, a healthcare provider may adjust the dosage, observing the maximum recommended daily limit.


Q: Is Mitrazin known to affect weight?

A: Official regulatory documents indicate that Mitrazin has been associated with an increased appetite and weight gain as an adverse reaction observed in clinical trials.


Q: Is it normal to feel tired or dizzy when first starting Mitrazin?

A: Yes, official product labeling lists somnolence (drowsiness) and dizziness among the most common adverse reactions reported in clinical trials. These effects are often noted as being more common during the initial phases of treatment.


Q: If I miss a time I was supposed to take Mitrazin, what is the informational guidance?

A: Informational guidance provided in the product label outlines steps for handling a missed dose, typically advising taking the dose as soon as remembered unless the next dose is due soon. The guidance cautions against taking a double dose to compensate for the missed one.


Q: Does using Mitrazin affect fertility in men or women?

A: Studies performed in animals indicated reduced fertility in both male and female rats at high doses. Regulatory documents state that the effect of mirtazapine on human fertility is not known.


Q: Is Mitrazin generally suitable for individuals who also have diabetes?

A: Mitrazin is associated with weight gain and potential increases in blood cholesterol and triglyceride levels. Regulatory guidance indicates that metabolic parameters, such as blood sugar and lipid levels, may require close monitoring during treatment for patients with underlying metabolic conditions.


Q: Does taking Mitrazin potentially interfere with or alter common blood test results?

A: Yes, official documents note that treatment has been associated with clinically significant changes measured in blood tests. These changes include elevated cholesterol and triglyceride levels, hyponatremia (low sodium), and elevations in liver transaminase enzymes.


Q: Is Mitrazin used for long-term or short-term treatment?

A: The efficacy of Mitrazin was established in short-term, controlled clinical trials. Studies have shown its effectiveness in maintaining a response for up to 40 weeks following initial treatment, and physicians are advised to periodically re-evaluate the drug's long-term usefulness.


Q: Does alcohol reduce the effectiveness of Mitrazin?

A: Official warnings state that alcohol must be avoided while using Mitrazin. Combining the two is known to enhance the sedative effects of the medicine, significantly increasing the risk of drowsiness and severely reduced alertness.


Q: Is there a maximum limit on how long a person can continuously use Mitrazin?

A: While clinical trials have supported the medicine's ability to maintain a response for up to 40 weeks, official documents advise that the long-term usefulness of the drug should be periodically re-evaluated by a healthcare provider.


Q: What kind of studies or research evidence supports the use of Mitrazin?

A: Official product information states that the efficacy of Mitrazin for Major Depressive Disorder was established based on evidence from short-term, randomized, placebo-controlled trials conducted in adult outpatients.


Q: What regulatory bodies have approved Mitrazin for use?

A: Mirtazapine has received approval from major governmental regulatory bodies worldwide. For instance, the U.S. Food and Drug Administration (FDA) granted its initial approval for the medicine in 1996.


Q: How do doctors monitor the effects of Mitrazin?

A: According to official guidance, healthcare providers monitor patients closely for several clinical signs. This includes monitoring for clinical worsening, the emergence of suicidal thoughts, changes in behavior, and metabolic abnormalities like elevations in cholesterol, triglycerides, and liver enzymes.


Q: Does Mitrazin have different effects on men versus women?

A: Pharmacokinetic studies have examined how the body processes the medicine in different genders. Findings indicate that females typically exhibit a significantly longer elimination half-life (meaning the drug stays in the system longer) than males, though there was no difference noted in overall responsiveness.


Q: Are there any specific foods or drinks to avoid when using Mitrazin?

A: Official warnings state that alcohol must be avoided entirely due to the enhanced sedative effects. While some patient information discusses grapefruit and its juice, regulatory documents focus warnings on certain drug interactions, such as those that inhibit the CYP3A enzyme.


Q: Are there any specific, known long-term health risks associated with Mitrazin use?

A: Official documents advise that the long-term usefulness of the drug should be periodically re-evaluated. Known long-term risks are those associated with the documented adverse events, which can include metabolic changes, such as sustained elevations in cholesterol and triglyceride levels.

How should Mitrazin be stored and disposed of?

How to Store and Dispose of Mitrazin (Mirtazapine)

Official regulatory documents define strict storage and disposal requirements for Mitrazin.

Storage Conditions

Mitrazin tablets must be stored at controlled room temperature, generally maintained between 20 C to 25 C (68 F to 77 F). The product requires protection from light and moisture and must be kept in its original, tightly closed container.

For the orally disintegrating tablets (ODT), the unit must remain sealed in its blister pack until the moment of administration. The oral solution has an in-use stability limit and must be discarded 45 days after the bottle is opened.

All forms of the medicine must be stored out of the sight and reach of children.

Disposal Instructions

Disposal of any unused or expired Mitrazin must be conducted in accordance with local regulatory requirements. The medicine should not be thrown away via household trash or flushed down the toilet. Authorities recommend returning expired product to a pharmacist or utilizing a drug take-back program.

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

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