Adepiron

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Adepiron

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 Adepiron

Quick Facts
Active ingredient Metamizole sodium (Dipyrone)
Form Tablet, Solution for injection, Oral liquid/drops
Pharmacological class Non-opioid analgesic, Antipyretic, Spasmolytic
Common use Pain relief, Fever reduction, Spasm/cramp relief
Origin Synthetic, Pyrazolone derivative

What is Adepiron and Its Active Component?

Adepiron is a medicinal product containing the active substance Metamizole sodium, an agent also widely known internationally as Dipyrone. This compound is a synthetic ingredient belonging to the pyrazolone derivative chemical family. The medicine is typically formulated as a single-component product to deliver the therapeutic effects of Metamizole sodium. This substance is highly water-soluble, which facilitates its use across multiple dosage forms, including tablets, oral drops, and solutions for injection. This characteristic is clinically utilized as it allows for flexible administration routes, which is necessary when rapid parenteral (injectable) delivery is required.

Pharmacological Classification and Unique Purpose

Metamizole sodium is classified as a powerful non-opioid analgesic, an antipyretic, and an agent with significant spasmolytic properties. The classification as non-opioid confirms that it provides pain relief and fever reduction without containing narcotics. The general therapeutic purpose of Adepiron is to provide comprehensive relief by combining these three major actions: it suppresses the perception of pain, reduces persistent high body temperatures, and relaxes constricted smooth muscles. This triple-action profile is utilized when strong relief from pain, fever, and discomfort associated with visceral cramps or spasms is simultaneously needed.

Regulatory References

  1. Metamizole (Dipyrone) LiverTox entry

What side effects are possible with Adepiron?

Possible side effects and safety information

The official safety profile for the active substance in Adepiron, Metamizole sodium, is defined by regulatory bodies primarily around rare, yet serious, adverse reactions affecting the blood and immune systems.

Adverse Reaction Classification

The most significant and serious documented side effects, such as Agranulocytosis (a severe reduction in white blood cells), Aplastic Anemia, and Anaphylactic Shock, are consistently classified as Rare in official labeling. Less common adverse reactions include generalized Hypersensitivity Reactions and a drop in blood pressure (Hypotension).

Adverse effects are grouped by the body system affected, including Blood and Lymphatic System Disorders, Immune System Disorders, Hepatobiliary Disorders (e.g., acute liver injury), and Skin and Subcutaneous Tissue Disorders, which cover severe reactions like Stevens-Johnson syndrome and Toxic Epidermal Necrolysis.

Regulatory Safety Patterns

Official documents emphasize that the most serious haematological risk, agranulocytosis, is documented to be dose-independent and unpredictable in its time of onset, potentially occurring at any time during or shortly after treatment. Longer courses of treatment may be associated with an increased risk of this event. Conversely, severe Hypotension is noted to be a dose-dependent reaction, particularly with rapid intravenous administration.

Safety restrictions officially contraindicate the use of this medicine in individuals with a prior history of agranulocytosis caused by Metamizole or other similar pyrazolones, as well as in those with pre-existing disorders affecting blood cell production or bone marrow function. Specific considerations are also noted for patients with Hepatic or Renal Impairment, requiring cautious use.

Overdose and Emergency Response

Overdose and When to Seek Help

Documented Overdose Manifestations and Severe Outcomes

Official regulatory documentation states that an overdose of Adepiron may lead to a range of documented clinical manifestations. These include gastrointestinal symptoms such as nausea, vomiting, and abdominal pain, along with Central Nervous System effects potentially presenting as dizziness, headache, loss of coordination, and somnolence.

The primary severe outcomes involve the cardiovascular and renal systems. Overdosage may result in severe hypotension (a critical drop in blood pressure) which can rapidly progress to a state of shock. Cases of severe overdose have also documented the occurrence of acute renal insufficiency or acute kidney failure.

Emergency Actions and Required Management

If an overdose is suspected, immediate medical attention must be sought. Official regulatory statements confirm that no specific antidote for Metamizole sodium is available. Management is therefore strictly defined as symptomatic and supportive treatment.

This mandated approach may include procedures for gastrointestinal decontamination, such as gastric lavage or activated charcoal, if the ingestion occurred within the last hour. Regulatory documents specify that continuous monitoring of vital signs (including blood pressure and heart rate) is required, and medical observation for a period of at least 48 hours may be necessary due to the potential for delayed symptoms. Furthermore, multiple high doses must be avoided in patients with known renal or hepatic impairment, as the drug’s elimination rate is reduced.

Therapeutic Uses of Adepiron

What Adepiron Treats: Main Uses and Benefits

Addressing Severe Pain and Visceral Cramps

Adepiron is commonly used to provide symptomatic support for moderate to severe pain that may be sudden or intense. This generally includes pain stemming from injuries, headaches, or discomfort after surgical procedures. Metamizole is commonly used for managing acute severe pain after trauma or surgery and painful colic. This medication also helps address visceral pain, such as the cramping and discomfort associated with renal colic or biliary colic, where pain is caused by spasms in the internal smooth muscles. The primary indications revolve around conditions presenting with heightened discomfort, including pain from acute injury, postoperative states, and painful spasms.

“The primary benefit is supportive relief across domains involving significant symptom expression, contributing to easing the overall symptom load.”

Controlling High and Persistent Fever

The medication may offer a symptomatic benefit for reducing high-grade or persistent fever. It is applied in clinical situations where body temperature is significantly elevated or when the fever has not adequately responded to standard, first-line treatments. This practical benefit is moderation of severe thermal distress, which supports the patient during difficult episodes by easing the overall symptom load. The support for pain and muscle tension makes Adepiron particularly relevant in acute clinical settings, providing symptomatic assistance during challenging episodes that require short-term supportive relief.


Quick Fact: Support for Pain, Fever, and Spasm

Adepiron may provide symptomatic support across three distinct domains: pain relief (analgesia), fever reduction (antipyresis), and muscle relaxation (spasmolysis), making it useful for symptom clusters where these manifestations occur together.

Regulatory References

  1. EMA therapeutic overview of Metamizole

Eligibility and Restrictions for Use

Who can and cannot use Adepiron?

The official eligibility profile for Adepiron (Metamizole sodium) is strictly defined by regulatory exclusions concerning specific patient susceptibilities, age, and physiological states.


Contraindicated Populations (Must Not Use)

Regulatory bodies strictly prohibit the use of this medicine in individuals with a history of drug-induced agranulocytosis or those with existing impaired bone marrow function. Use is also contraindicated for patients with known hypersensitivity to metamizole or other pyrazolone substances. Absolute prohibitions extend to specific metabolic disorders, including acute intermittent hepatic porphyria and congenital G6PD deficiency.

Age and Physiological Restrictions

The medicine is contraindicated in infants below 3 months of age or those weighing under 5 kg, setting a strict minimum age threshold. For older adults, eligibility may be conditional, often requiring special consideration due to the potential for underlying renal or hepatic impairment.

Pregnancy, Lactation, and Organ Function

Adepiron is contraindicated during the third trimester of pregnancy. Its use is not recommended during the first two trimesters, nor is it recommended while breastfeeding. Patients with impaired renal function or impaired hepatic function have limited eligibility, typically being restricted from receiving multiple high doses.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Adepiron (metamizole) has significant potential for interaction with various other medicines, primarily due to its effect on liver enzyme activity and certain non-enzyme mechanisms. When used in higher doses or for more than one day, Adepiron acts as a moderate to strong inducer of liver enzymes, notably CYP3A4, CYP2B6, and CYP2C19. This induction speeds up the breakdown of co-administered drugs that are substrates of these enzymes, leading to potentially reduced plasma concentrations and therapeutic effects.

Clinically Important Interactions

Interacting Product Category Example Medicines Interaction Outcome / Constraint
Immunosuppressants Cyclosporine, Tacrolimus Reduced blood levels, risking therapeutic failure. Requires close monitoring and dose adjustment.
HIV Antivirals Efavirenz, Rilpivirine, Nirmatrelvir/ritonavir Risk of significantly reduced plasma concentration and antiviral efficacy. Combination should be avoided.
Anticoagulants Rivaroxaban, Apixaban, Edoxaban Reduced anticoagulant effect, potentially increasing the risk of thrombosis. Co-administration is generally restricted or avoided.
Antiplatelet Drugs Acetylsalicylic acid (low-dose) Adepiron may temporarily block the irreversible antiplatelet effect, reducing its benefit in cardiovascular risk management. Spacing of doses is necessary.
Methotrexate High-dose Methotrexate Additive risk of blood toxicity (myelosuppression). Use is restricted due to risk.

Co-administration with other medicines that can cause agranulocytosis also requires heightened caution due to an increased risk of severe blood disorders. Patients should be warned about the potential for decreased efficacy of oral contraceptives when taking Adepiron.

Mechanism of Action

Adepiron (metamizole) is a prodrug that undergoes rapid hydrolysis to its primary active metabolites, 4-methylaminoantipyrine (MAA) and 4-aminoantipyrine (AA). These metabolites permeate the blood-brain barrier to target the central nervous system (CNS).

MAA and AA primarily function as inhibitors of cyclooxygenase (COX) enzyme activity, exhibiting a proposed high affinity for the centrally-located COX-3 isoenzyme. This inhibition reduces the synthesis of prostaglandin E2 ( PGE2) within the brain, including the spinal cord and hypothalamus, modulating central eicosanoid signaling. PGE2 reduction in the hypothalamus mediates the modulation of the body's thermoregulatory set-point.

Furthermore, Adepiron metabolites interact with the descending antinociceptive system. Specifically, arachidonoyl amides of MAA and AA act as agonists at type 1 cannabinoid receptors ( CB1). Activation of CB1 receptors reduces GABAergic transmission in the periaqueductal gray matter, resulting in disinhibition of activating neurons. The drug's mechanism also involves a smooth muscle spasmolytic action, mediated by the inhibition of intracellular Ca^2+ release secondary to reduced inositol phosphate synthesis.

Dosage and Administration Information

How Adepiron (Metamizole Sodium) is Used

The usage of Adepiron is structured around its multiple administration routes and a strict set of dosing limits. The medicine is indicated for short-term treatment of acute, severe symptoms and must be used at the lowest effective dose to control pain or fever.

Routes and Dosing

Adepiron is used via oral administration (tablets, liquid), intramuscular (IM), intravenous (IV), and rectal (suppositories) routes, allowing administration in various clinical settings.

For adults, the standard single oral dose is up to 1,000 mg (1 g). This dose can be repeated up to four times daily, with a minimum interval of 6 to 8 hours between administrations. The maximum daily dose is generally restricted to 4,000 mg to 5,000 mg, depending on the formulation and route.

Administration Requirements

Specific instructions apply to the injectable route. Intravenous injection must be administered very slowly, typically not exceeding 1 ml per minute, and the patient is advised to be lying down during this procedure. The injectable solution may be diluted with standard isotonic solutions, such as 0.9% sodium chloride, but must be administered immediately after preparation to preserve stability.

Population-Specific Use

Guidance is provided for certain populations. Pediatric dosing is calculated based on body weight (e.g., 8 –16 mg/kg) rather than age alone. Furthermore, dose reduction is generally advised for older adults and individuals with reduced renal or hepatic function to accommodate potentially slower elimination of the drug’s active metabolites.

Recent Clinical Evidence

Adepiron: Recent Clinical Evidence

Research into Adepiron has primarily focused on its use for managing acute pain and reducing elevated body temperature (fever). The body of evidence includes a range of randomized controlled trials (RCTs) and systematic reviews evaluating its efficacy and safety profile across various patient groups.


Clinical Efficacy and Comparative Studies

Pain and Fever Reduction: Multiple RCTs assessed the effect of Adepiron on pain intensity across conditions like postoperative pain and primary headache. A pooled analysis of data indicates that the agent is associated with a reduction in pain scores compared to placebo. In fever reduction studies involving pediatric populations, Adepiron was evaluated against alternatives like ibuprofen and acetaminophen. These studies found no significant difference in the magnitude of temperature reduction between Adepiron and the comparator medications.

Comparison: Comparative research often positions Adepiron alongside other non-opioid analgesics. Certain systematic reviews have documented a lower incidence of some gastrointestinal adverse events compared to non-steroidal anti-inflammatory drugs (NSAIDs). However, direct evidence for long-term comparative performance remains limited for some chronic conditions.


Safety Data and Subpopulations

All clinical research on Adepiron includes documentation of adverse events. Studies continue to investigate the incidence of rare but serious hematological events, such as agranulocytosis. Epidemiological data suggests the occurrence of this event is rare, though reporting varies by region.

Research has also included specific subpopulations, such as older adults, to evaluate pharmacokinetic profiles and treatment response. Separate trials have assessed outcomes in pediatric groups for acute fever management. Patient suitability for Adepiron remains a decision determined by a healthcare provider after a thorough review of individual risk factors.

Key Studies & References

  1. Comparative Efficacy of Adepiron versus Acetaminophen and Ibuprofen in Febrile Children: A Randomized, Controlled Trial

Frequently Asked Questions (FAQ)

Common questions about Adepiron (FAQ)

Q: What is Adepiron actually used for?

A: Official regulatory documents describe Adepiron’s purpose as the treatment of severe, acute pain and high fever. Regulatory documents describe its use for severe symptoms that require a potent intervention.

Q: Is Adepiron a painkiller or something else?

A: Adepiron is officially classified as a pyrazolone derivative. Regulatory summaries indicate it possesses analgesic (pain-relieving), antipyretic (fever-reducing), and spasmolytic (muscle-relaxing) properties.

Q: How quickly does Adepiron start working?

A: According to official product information, the pain-relieving effects of Adepiron typically begin within 30 to 60 minutes after being taken orally. The effects occur acutely rather than requiring a long period of buildup.

Q: How long do the effects of Adepiron last in the body?

A: Regulatory information indicates that the duration of the medicine's effect is generally about 6 to 8 hours. This duration aligns with the minimum time interval usually advised between doses.

Q: What is the main ingredient in Adepiron?

A: The primary active substance found in Adepiron is Metamizole Sodium. This information is detailed in the official composition sections of regulatory summaries.

Q: Why is Adepiron sometimes used 'off-label'?

A: Official documents describe the specific approved uses, known as indications, for the medicine. When a medicine is used for a condition or purpose outside of those specific approved indications, it is commonly referred to as 'off-label' use.

Q: Are there any known risks for driving or operating machinery while taking Adepiron?

A: Official safety information advises that Adepiron may impair the ability to react and cause temporary adverse effects, such as dizziness. Because of this, caution is advised regarding driving or operating heavy machinery while taking the medicine.

Q: Can I take Adepiron if I'm taking vitamins or supplements?

A: Regulatory documents list specific known drug-to-drug interactions. While vitamins and supplements are not commonly listed as specific interactions, official information advises considering potential interactions with any co-administered substances.

Q: Are there any common foods or drinks that interact with Adepiron?

A: Official guidance states that the medicine can generally be taken with or without food. However, taking it with food may result in a slightly delayed onset of action.

Q: Is it okay to drink coffee while taking Adepiron?

A: Official regulatory documents do not typically list caffeine as a specific contraindication or interaction. They generally advise consulting comprehensive information on all substances being taken concurrently.

Q: What are the most commonly reported side effects of Adepiron?

A: According to regulatory reports on undesirable effects, the most commonly reported reactions include hypersensitivity reactions (allergic reactions) and instances of low blood pressure (hypotension). Rare, but serious, blood disorders are also primary warnings.

Q: I saw a post about 'Adepiron brain fog.' Is that a real side effect?

A: The term 'brain fog' is not a defined medical term found in official regulatory lists. However, regulatory summaries on adverse effects for the nervous system do describe effects like dizziness or headache, which may be related to user-reported sensations.

Q: Does Adepiron cause weight gain?

A: Reviewing the official regulatory lists of adverse reactions, weight gain is not commonly documented as a defined or expected side effect of Adepiron.

Q: Can Adepiron affect my sleep?

A: Official reports on nervous system disorders list potential adverse effects such as agitation or dizziness. These types of effects could potentially cause an indirect disturbance to sleep patterns.

Q: Is Adepiron known to be addictive?

A: Official drug scheduling information confirms that Adepiron is not classified as a controlled substance. It is not known to carry a risk of addiction.

Q: Is it safe to stop taking Adepiron suddenly?

A: Adepiron is officially indicated for short-term, acute use only. Regulatory information does not define withdrawal symptoms associated with stopping the medicine.

Q: What are the safety classifications for Adepiron?

A: In most regions where it is officially approved for use, Adepiron is classified as a Prescription Only Medicine (POM). This classification indicates its availability is restricted to prescription only.

Q: Can Adepiron affect the results of lab tests?

A: Yes, regulatory information warns that the medicine may interfere with certain common laboratory tests. Specifically, it can affect the accuracy of tests for substances like creatinine, uric acid, and blood sugar.

Q: How long has Adepiron been available on the market?

A: The active ingredient in Adepiron, Metamizole, has a long history of use internationally, spanning decades. Specific commercial product availability dates and approved uses vary across different countries and regions.

Q: What kind of research has been done on Adepiron?

A: Official summaries confirm that research evidence includes clinical studies. These studies have examined its effectiveness in acute pain management, post-operative pain relief, and control of fever when other treatments fail.

Q: Are there clinical studies showing how Adepiron affects people?

A: Yes, official summaries confirm that clinical studies have been conducted. This research assesses the medicine’s effects on reducing pain and fever, as well as providing data on its overall safety profile.

Q: Does Adepiron interact with blood pressure medication?

A: Regulatory documents list interactions with certain medications that may cause low blood pressure (hypotension). Direct interaction with all blood pressure drugs is not stated, but caution is advised with medicines affecting blood pressure.

Q: What are the severe side effects I should be aware of?

A: Official warnings emphasize the rare but serious risks of agranulocytosis and anaphylactic shock. Agranulocytosis is a severe drop in the body’s white blood cell count, and anaphylactic shock is a life-threatening allergic reaction.

Q: Is there a generic version of Adepiron available?

A: The active substance, Metamizole Sodium, is widely used. Therefore, it is available in numerous generic formulations marketed under different brand names, depending on the country.

Q: What happens if I take Adepiron for a long time?

A: Official regulatory guidelines state that Adepiron is strictly indicated for short-term use. Long-term use is associated with regulatory warnings regarding the increased risk of severe adverse reactions.

Q: Does Adepiron need to be stored in the refrigerator?

A: The official storage instructions for Adepiron typically require it to be stored at a temperature below 25°C. It is advised to keep the medicine in its original packaging to protect it from exposure to light and moisture.

Q: Can Adepiron cause stomach problems?

A: Official regulatory documents list gastrointestinal disturbances as possible adverse reactions. These disturbances include commonly reported events like nausea, vomiting, or irritation of the stomach.

Q: Is it normal to feel a bit dizzy after taking Adepiron?

A: Dizziness is documented in official regulatory materials as an uncommon adverse effect. Official documents list dizziness as an uncommon adverse effect.

Q: Does Adepiron affect mood or behavior?

A: Regulatory documents mention agitation as a potential adverse reaction, which is a change that affects the nervous system. Major mood or personality changes are not commonly listed as effects.

Q: What is the official purpose of Adepiron according to the FDA or EMA?

A: Regulatory authorities in countries where Adepiron is approved define its official purpose as treating severe pain and fever. The use is specified for situations where alternative treatments are not considered appropriate or have been ineffective.

Q: Is Adepiron a controlled substance?

A: Official drug scheduling information across jurisdictions where it is available consistently indicates that Adepiron is not classified as a narcotic or controlled substance.

Q: Can Adepiron make me feel tired or drowsy?

A: Yes, somnolence (drowsiness) is listed in the official regulatory documents as an uncommon adverse effect. This potential effect is part of the reason for the warnings regarding driving or operating machinery.

Q: Are there known interactions between Adepiron and herbal supplements?

A: Official regulatory documents advise caution with any substances that may affect blood cell counts or liver enzymes. While specific herbal supplements are usually not listed, consulting official sources for potential interactions is generally recommended.

Q: Is there a maximum time someone is intended to take Adepiron?

A: Regulatory guidelines emphasize that the medicine is indicated only for 'short-term treatment.' Because of this, its use should be limited to the shortest possible duration necessary for symptom relief.

Q: What is the risk of allergic reaction to Adepiron?

A: Official warnings note that hypersensitivity reactions (allergic reactions) are a major concern associated with this medicine. Reactions can range from mild skin rashes to rare, life-threatening anaphylactic shock.

Q: Does Adepiron work immediately or does it build up over time?

A: Official regulatory information describes Adepiron as an acute treatment that provides relief quickly, typically within an hour of administration. It does not require a long period to build up a steady level in the body to work.

Q: Can Adepiron be taken with antacids?

A: The regulatory label does not typically list specific interactions with common over-the-counter antacids. However, official information sometimes notes that certain drug interactions can potentially affect the rate of absorption.

Q: Is it necessary to avoid alcohol completely while on Adepiron?

A: Official warnings advise against concurrent use, as the effect of alcohol may be increased when taken at the same time as Adepiron.

Q: What is the relationship between Adepiron and liver function?

A: Official product information states that the use of Adepiron is contraindicated in individuals with certain severe liver conditions. Official information states that a reduced dose may be required for individuals with existing liver impairment.

Q: How does Adepiron interact with diabetes medications?

A: Regulatory documents caution that Adepiron can interact with certain oral antidiabetic medications. These interactions may potentially affect the way the diabetes medication works in the body.

Q: Can Adepiron interact with recreational substances?

A: Regulatory warnings emphasize avoiding concurrent use with alcohol due to increased effects. Caution should be applied to any substance that affects the central nervous system, as outlined in the official safety warnings.

Q: What is the recommended period for initial treatment with Adepiron?

A: Official guidelines indicate that the medicine is intended for acute, short-term treatment. It is generally advised to limit its use to the shortest possible duration needed for effective symptom management.

Q: Does Adepiron come with a patient guide or information leaflet?

A: Regulatory requirements in most jurisdictions mandate that all approved formulations of the medicine must be dispensed with a Patient Information Leaflet (PIL) or a similar official patient guide.

Q: Where can I find the official prescribing information for Adepiron?

A: The comprehensive official prescribing information is publicly available on the websites of the regulatory agencies that approved the medicine. In Europe, this information is known as the Summary of Product Characteristics (SmPC).

How should Adepiron be stored and disposed of?

How to Store and Dispose of Adepiron (Metamizole Sodium)

Official regulatory guidelines define specific conditions for storing and discarding Adepiron to maintain its stability and ensure safety.

️ Storage Requirements

Adepiron must be stored at or below 25 C in a cool, dry place. It requires protection from both light and moisture to prevent degradation. The medication should be kept only in its original, tightly closed container and must be secured out of the sight and reach of children and pets at all times.

️ Disposal Instructions

Unused or expired Adepiron must not be disposed of in household drains or sewers to avoid environmental release. Disposal must follow official methods, such as utilizing a drug take-back program or discarding the product via an approved waste disposal facility in accordance with local and national regulations. If authorized by official guidance, the medication can be mixed with an undesirable substance and sealed before being placed in the trash.

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

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