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Novopyrine

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Novopyrine

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Medically reviewed

Rosario Oropesa

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.

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Overview of Novopyrine

Quick Facts

Property Description
Active Ingredient Sodium Metamizole (Metamizole / Dipyrone)
Forms Oral (tablets, drops), parenteral (solution), rectal (suppositories)
Pharmacological Class Non-Opioid Analgesic, Pyrazolone Derivative
Core Purpose Relief from pain and reduction of fever
Origin Synthetic drug

What Type of Medicine is Novopyrine?

Novopyrine is the trade name for a medicine containing the active substance Sodium Metamizole, which is also globally recognized as Dipyrone. This compound is structurally categorized as a Pyrazolone Derivative, a specific chemical grouping. The compound is functionally classified as a potent Non-Opioid Analgesic. The drug belongs to the class of pain relievers that do not act as narcotic substances. As a synthetic drug, Sodium Metamizole holds a distinct position among pain and fever relievers. Its designation primarily as an Analgesic-Antipyretic establishes its two core functions.

Sodium Metamizole: Composition and General Forms

The composition of this medication is based on the single active ingredient, Sodium Metamizole, making it a typical single-active-ingredient product (monotherapy). The chemical is supplied in various forms suitable for different administration routes, including oral preparations, as well as solutions for parenteral (intravenous or intramuscular) and rectal use. Metamizole is used for conditions where pain and fever relief are required. This confirms the drug's established primary role in managing these two symptoms.

What is the Core Purpose of this Analgesic-Antipyretic?

The core purpose of the medicine is to provide strong symptomatic relief by targeting pain and reducing elevated body temperature (fever). As an Analgesic-Antipyretic, the fundamental benefit of the Metamizole component is its dual capability to alleviate discomfort. For example, it is typically employed in situations requiring rapid relief from acute, intense discomfort and high fever. The drug achieves this by acting centrally to modulate the body's perception of pain and by resetting the thermal regulatory center, which is the mechanism recognized for controlling fever.

Regulatory References

  1. NIH
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What side effects are possible with Novopyrine?

Possible Side Effects and Safety Information

The safety profile for Novopyrine (Sodium Metamizole) is strictly governed by regulatory classifications based on officially documented adverse reactions. The most serious safety constraints defined in regulatory documents relate to potential blood disorders and severe hypersensitivity.

Official Adverse Reaction Scope

Adverse effects are classified by system-organ class, with the most critical events relating to the Blood and Lymphatic System Disorders (e.g., Agranulocytosis, Aplastic Anaemia) and Immune System Disorders (e.g., Anaphylactic Shock). Serious reactions also include Hepatobiliary Disorders such as acute liver failure and severe dermatological conditions like Stevens-Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN).

Classification Examples of Reactions (Regulatory Documentation)
Rare Agranulocytosis, Anaphylactic Shock, Severe Skin Reactions
Common Nausea, Vomiting, Headache, Somnolence

Official Safety and Constraint Notes

Agranulocytosis, which is classified as a rare event in some official documents, is explicitly noted as not being related to the dose and can occur at any time during treatment or shortly after it concludes. The risk of liver injury has also been documented with both hyper-acute (rapid) and delayed onset patterns.

Regulatory restrictions specify that the medicine must not be used in individuals with a prior history of Agranulocytosis caused by similar medicines or in those with pre-existing bone marrow impairment. Use is advised against during the third trimester of pregnancy due to potential effects on the fetus.

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Overdose and Emergency Response

Overdose and When to Seek Help

Novopyrine (Metamizole) overdose can result in serious health consequences, and immediate medical attention is required for any suspected or known supratherapeutic exposure. Overdose management is primarily supportive, as no specific antidote is available for Metamizole toxicity.

Documented Overdose Presentations

Symptoms of acute overdose are principally linked to high exposure levels and may include the following manifestations, as noted in authoritative safety literature:

Overdose scope Clinical Manifestations (Label-Derived)
Documented presentations Nausea, vomiting, abdominal pain, drowsiness, dizziness, nystagmus (involuntary eye movement).
Physiological systems affected Gastrointestinal, Central Nervous System (CNS), Renal (kidneys), and Cardiovascular.
Serious complications Acute renal failure, liver dysfunction, generalized tonic–clonic seizures, severe hypotension, and metabolic acidosis, potentially leading to coma or death.

Emergency Response and Urgent Care

Emergency-response statements (as written in official documents): Immediate medical consultation or treatment is required in the event of an overdose. Contact an emergency medical service, hospital emergency department, or Poison Control Center immediately.

When immediate medical help is required: Medical help must be sought immediately following a known or suspected overdose, even if the patient feels well or has no symptoms, due to the potential for delayed, life-threatening complications.

Overdose Context Constraints

Management procedures, such as measures to reduce absorption (e.g., gastric lavage or activated charcoal) and supportive treatment, must be instituted according to established clinical guidelines. Supportive care is critical, targeting symptoms like hypotension and respiratory distress. Overdose risk is considered elevated with ingestion of large volumes or in combination with other substances.

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Therapeutic Uses of Novopyrine

Novopyrine (Sodium Metamizole) is considered relevant for easing symptoms related to severe pain and high fever in contexts where additional symptomatic support is needed. The medication is used across three primary therapeutic domains.

It is applied in clinical settings that involve acute or unstable symptom patterns, such as postoperative pain, certain intense headaches, discomfort from injury, and cramping pain like that associated with renal or biliary colic. The medication is commonly used to help with symptoms related to systemic imbalance, specifically elevated body temperature (fever), when symptoms become temporarily overwhelming. This use contributes to improved comfort during periods of heightened symptoms and helps maintain a sense of stability.

“Novopyrine may assist with managing symptoms related to physical discomfort across various acute and episodic clinical presentations.”


Quick Fact: Relief for Pain, Fever, and Spasms

Symptom Domain Key Benefit
Severe Pain Provides supportive analgesic relief
High Fever Supports comfort and helps ease distress
Colic/Spasms Assists in managing cramping discomfort
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Eligibility and Restrictions for Use

Official Eligibility: Who Can and Cannot Use Novopyrine?

Eligibility for Novopyrine (Sodium Metamizole) is strictly governed by regulatory documentation, establishing absolute prohibitions for certain high-risk populations. Use is generally established for adults and adolescents (typically 15 years and older) who do not possess any specified contraindications.


Absolute Contraindications

The medicine must not be used by patients with:

  • A history of agranulocytosis (severe reduction in white blood cells) from any cause.
  • Known hypersensitivity to Metamizole or other pyrazolone derivatives.
  • Impaired bone marrow function or diseases of the haematopoietic system.
  • Acute intermittent hepatic porphyria or congenital G6PD deficiency.

Population Restrictions

Population Group Eligibility Status Restriction Context (as per label)
Pregnancy Contraindicated Use is absolutely prohibited during the third trimester and is not recommended in the first and second trimesters.
Breastfeeding Not Recommended Use is generally contraindicated due to metabolite transfer into breast milk.
Pediatric Use Not Recommended Use is generally not recommended in infants under 3 months of age, with strict minimum age and weight limits for older children.
Organ Impairment Conditional Use Patients with severe renal or hepatic impairment should avoid multiple high doses due to reduced elimination rates.

These eligibility rules define the population groups for whom the medicine is contraindicated (prohibited) or not recommended, based on official regulatory classifications.

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What should I know about interactions with other medicines?

Interactions with other medicines and products

Novopyrine (Sodium Metamizole) is documented in regulatory sources to interact with other substances primarily through metabolic enzyme induction and specific pharmacodynamic effects.

Pharmacokinetic Interactions

Metamizole is officially classified as a moderate to strong inducer of key metabolic enzymes, specifically CYP3A4, CYP2B6, and CYP2C19. This enzyme induction results in a reduction in the plasma concentration (AUC) of many co-administered medicines that are substrates for these enzymes, potentially leading to reduced exposure. Medicines affected include Ciclosporin, Midazolam, Efavirenz, Valproate, Bupropion, Methadone, and Tacrolimus.

Pharmacodynamic Interactions and Constraints

Official labeling describes a pharmacodynamic interference with low-dose Acetylsalicylic acid (ASA) used for cardiovascular protection, as co-administration can reduce the ASA’s antiplatelet effect. For this reason, a mandatory separation of administration is recommended. Co-administration with Methotrexate carries an additive risk for hematologic toxicity (myelosuppression), as formally stated in regulatory documents. Additionally, co-use with Chlorpromazine may result in additive hypothermia.

Interaction-Related Contraindications

Use is formally contraindicated in the third trimester of pregnancy and in infants below the age of three months or five kilograms of body weight. The drug is also prohibited for use in patients with previously documented metamizole-induced agranulocytosis or pre-existing diseases of the hematopoietic system.

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Mechanism of Action

Central Modulation of Nociceptive and Thermal Pathways

The main actions of Novopyrine are driven by its mechanistic activity within the Central Nervous System ( CNS). The active metabolites of the drug primarily inhibit the COX-3 enzyme, which is highly involved in Prostaglandin E2 ( PGE2) synthesis in the hypothalamus, the brain's thermal regulatory center. Concurrently, the drug modulates central pain transmission by activating the CB1 receptor and enhancing the endogenous opioidergic system. This dual central mechanism modulates nociceptive and thermoregulatory signaling by influencing the body’s descending inhibitory pathways.


Targeted Modulation of Visceral Smooth Muscle Tension

A distinct pharmacological action of Novopyrine is its mechanism for reducing smooth muscle tension, which involves a direct influence on the muscle fibers of internal organs. This mechanism is separate from its CNS activity and operates by modulating the intracellular Ca^2+ signaling required for muscle contraction. By interfering with the process that governs smooth muscle tension, the drug affects systems characterized by involuntary smooth muscle contraction, which results in altered smooth muscle tone.


Mechanistic Distinction: Low Peripheral Anti-inflammatory Effect

While maintaining a chemical structure similar to other compounds, the drug's core mechanism is not reliant on peripheral COX-1 or COX-2 inhibition in inflamed tissue. The metabolites exhibit only weak affinity for these peripheral enzymes, meaning the physiological consequence is predominantly based on neuro-modulation and thermal control, rather than altering the physiological cascade of local inflammation.

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Dosage and Administration Information

How Novopyrine is Used

Novopyrine (Sodium Metamizole) is administered according to high-level procedural instructions, defining the permitted forms, routes, and dosing parameters. The medicine is generally designated for short-term use and administered on an as-needed/intermittent schedule, with specific intervals observed between doses.


Administration Routes and Dosing Structure

Administration is approved via multiple routes, with corresponding dosage forms available:

Route of Administration Typical Adult Single Dose Range
Oral (Tablets/Drops) 500 mg to 1,000 mg
Parenteral (IV/IM Solution) 500 mg to 2,500 mg
Rectal (Suppositories) Varies by strength

Standard dosing is capped by a maximum daily dose of 4,000 mg for oral use and 5,000 mg for parenteral use. Standard protocols specify a minimum 6- to 8-hour interval between any two subsequent administrations, restricting frequency to a maximum of four doses per day.


Special Procedural Conditions and Adjustments

Specific administration requirements exist for the parenteral route. Intravenous injection must be performed very slowly, with the rate restricted to approximately 1,000 mg per minute to meet standardized protocol. The solution for injection can be diluted with standard intravenous fluids, such as 5% glucose or 0.9% sodium chloride, but must be used immediately.

Instructions require a reduced dose for specific patient populations. Dosing must be adjusted for older adults and for those with documented renal or hepatic impairment due to the compromised elimination of the drug's metabolites, adhering to the principle of using the lowest effective dose. Pediatric dosing is calculated based on the child's body weight.

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Recent Clinical Evidence

Research evidence / Overview of studies for Novopyrine

Novopyrine (Sodium Metamizole) was studied to explore symptom patterns in acute physical discomfort and high body temperature. The research approach was observed in different types of studies to understand how symptoms change over time in specific conditions, as outlined below.


Evidence for use in Acute Severe Pain

Research examining outcomes related to physical discomfort has centered on conditions associated with acute or disruptive episodes, such as post-operative recovery and certain types of acute injuries. The primary evidence source is short-term Randomized Controlled Trials (RCTs) and comprehensive Systematic Reviews which research examined.

These studies were conducted during periods of increased symptom activity in adult populations. Findings describe patterns observed in the studies related to outcomes related to physical discomfort in the immediate 24-hour post-treatment window. Evidence quality varies across studies, and many follow-up durations were limited to a few hours or a single day. Long-term effects are not fully established because the research is largely focused on the short-term control of episodes where symptoms become more noticeable.


Evidence for use in High or Persistent Fever

Antipyretic activity of Novopyrine was evaluated in comparative trials designed to assess temporary physiological imbalance. The research included both adults and pediatric populations (children). Findings indicate that studies report how symptoms evolved in the observed populations, specifically in terms of outcomes describing episodic or acute changes.

Comparative evidence is lacking for certain adult patient groups, as the existing research is largely focused on the immediate response to a single dose. Due to the rapid and temporary nature of fever, follow-up durations were limited, providing little insight into patterns of fever recurrence.


What Remains Uncertain About Novopyrine Research

The existing research, while providing context for short-term acute uses, highlights several areas where certainty remains low or where the evidence is limited.

Key research limitation frames include: Sample sizes were modest in many trials, which can make it difficult to generalize findings to broader patient populations, and Follow-up durations were limited, focusing on immediate relief rather than sustained or long-term symptom management. Research provides context but not individual predictions; the current evidence contributes to the broader evidence landscape but does not determine whether an individual will respond similarly.

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Frequently Asked Questions (FAQ)

Common questions about Novopyrine (FAQ)


Q: What is the main difference between Novopyrine and basic aspirin?

A: Novopyrine is primarily classified as an analgesic and antipyretic, meaning its main action is to relieve pain and reduce fever by working in the central nervous system. Official documents state that unlike basic aspirin, Novopyrine has only a weak effect on the local anti-inflammatory enzymes in body tissues. Furthermore, regulatory warnings note that Novopyrine can reduce the protective antiplatelet effect of low-dose Acetylsalicylic acid (ASA), which is often used for cardiovascular protection.

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

A: According to official product information, Novopyrine is rapidly converted into its active substance after intake. Studies examining the drug’s effects on symptoms focus on short-term outcomes in the immediate post-treatment period, and the onset of action after taking an oral dose generally occurs within about 30 to 60 minutes.

Q: Is it true that Novopyrine is not safe for people under 18?

A: Official eligibility documents state that use is generally established for adults and adolescents, specifically those typically 15 years and older, who do not have any contraindications. Use is explicitly not recommended in infants under 3 months of age, with strict minimum age and weight limits established for older children.

Q: Are the side effects of Novopyrine generally mild or severe?

A: The documented side effects include reactions that range from common but usually mild events, such as nausea, vomiting, headache, and drowsiness. However, official documents also warn of rare but potentially severe or fatal reactions, such as agranulocytosis (a severe drop in white blood cells) and severe allergic reactions. These risks are described in the overall safety profile.

Q: What are some common drug interactions to be aware of when taking Novopyrine?

A: Interactions documented in regulatory sources typically involve two main types. The first is reducing the effectiveness of other medicines by speeding up how quickly they are broken down in the liver (e.g., Ciclosporin, Bupropion). The second is increasing the risk of toxicity when combined with certain medicines like Methotrexate, or reducing the desired effect of low-dose aspirin (ASA).

Q: How quickly does Novopyrine leave the body?

A: The active substance of Novopyrine is eliminated from the body with a half-life of approximately 2 to 4 hours. Official documents indicate that this elimination rate can be significantly reduced in patients who have pre-existing kidney or liver impairment, meaning the substance will remain in the body longer for these individuals.

Q: Does Novopyrine affect blood pressure readings?

A: Yes, official regulatory documents state that the medicine may cause severe hypotensive reactions (low blood pressure) in rare cases. This reaction is considered a documented risk, especially when the medicine is administered too quickly via injection.

Q: Does Novopyrine have any warnings about kidney function?

A: Official warnings exist regarding renal (kidney) function. Because the elimination rate is reduced in those with impaired kidney function, regulatory instructions specify a reduced dose for these patients. Furthermore, patients with severe renal impairment are advised to avoid multiple high doses of Novopyrine.

Q: Can older adults safely use Novopyrine?

A: Official administration instructions specify that a reduced dose must be used for older adults. This is required because the elimination of the drug's metabolites may be compromised in this population, which could lead to higher levels of the substance remaining in the system for longer.

Q: What is the general difference between Novopyrine and common pain relievers like ibuprofen?

A: The main distinction lies in their mechanism of action. Unlike non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen, Novopyrine’s action is predominantly centered on modulating pain signals and fever control within the central nervous system. Its metabolites show only weak affinity for the peripheral enzymes in tissues that cause local inflammation.

Q: Can Novopyrine be taken by someone with a sensitive stomach?

A: While the drug’s mechanism is not primarily based on the peripheral anti-inflammatory action that can often irritate the stomach, regulatory documents list gastrointestinal disturbances like nausea and abdominal pain as documented adverse reactions. These effects are considered in the overall safety profile.

Q: Does Novopyrine cause drowsiness or make you tired?

A: Yes, official regulatory documents list Somnolence (drowsiness) and Headache as common adverse reactions documented in patients using the medicine. These effects are recognized in the drug's safety profile.

Q: Is Novopyrine safe to take if I have liver problems?

A: Official warnings exist regarding liver function. Elimination is reduced in those with impaired liver function, requiring a reduced dose. Additionally, regulatory documents warn that the medicine has been associated with rare cases of drug-induced liver injury, including acute liver failure, and this risk is part of the drug’s profile.

Q: How often do people usually need to take Novopyrine?

A: The medicine is generally designated for short-term use. Official administration instructions mandate a minimum 6- to 8-hour interval between any two subsequent administrations, restricting the frequency to a maximum of four doses per day.

Q: Is Novopyrine considered a first-line treatment for its primary uses?

A: While the drug is widely used globally, some regulatory bodies and international health organizations advise that it should not be considered a first-choice treatment. This guidance is due to the potential risk of severe blood disorders, such as agranulocytosis, requiring careful patient selection and monitoring.

Q: Do I need a prescription from a doctor to get Novopyrine?

A: The regulatory status of Novopyrine varies significantly depending on the country. In many jurisdictions, it is classified as a prescription-only medicine (POM) for human use. This classification is often applied because its risk profile requires supervision and monitoring by a healthcare professional.

Q: Is Novopyrine addictive or habit-forming?

A: Novopyrine is officially classified as a non-opioid analgesic and is a pyrazolone derivative. This official classification confirms that the drug does not act as a narcotic substance and is not associated with the addiction or habit-forming properties typical of opioid medications.

Q: Is there a generic version of Novopyrine available?

A: The active substance in Novopyrine is Sodium Metamizole (Dipyrone), which is an established pharmaceutical compound. Due to this, many metamizole-containing medicines are marketed globally, often under different brand names or as generic versions that contain the same active ingredient.

Q: Are there any specific foods or drinks that interact with Novopyrine?

A: Regulatory documents list numerous drug-to-drug interactions that must be considered by a prescriber. However, these documents do not typically mention specific foods or beverages as having a documented, significant interaction with Novopyrine that requires specific patient instruction.

Q: Why is Novopyrine sometimes mentioned alongside cardiovascular health?

A: Novopyrine is mentioned alongside cardiovascular health in official documents because of a known pharmacodynamic interference. Co-administration with low-dose Acetylsalicylic acid (ASA), which is often prescribed for cardiovascular protection, can reduce the protective antiplatelet effect of the ASA.

Q: What is the longest period of time someone can take Novopyrine?

A: The medicine is generally designated for short-term use in acute situations. Most research evidence is focused on immediate relief within short timeframes. Official warnings note that severe blood disorders, such as agranulocytosis, can occur at any time during treatment, irrespective of the duration of use, though the medicine is intended for short-term management.

Q: Is it normal to feel a mild headache after starting Novopyrine?

A: Yes, headaches are listed in official regulatory documents as a common adverse reaction that has been documented in patients using the medicine. This is a recognized event in the drug's safety profile.

Q: What should I do if I accidentally take too much Novopyrine?

A: Official documents on overdose state that immediate contact with the relevant emergency services or a specialized toxicology center is required for professional guidance.

Q: Are there any long-term side effects noted for Novopyrine use?

A: Due to the limited follow-up duration of most research, long-term effects are not fully established. However, official warnings state that severe blood disorders, such as agranulocytosis, can occur at any time during treatment or shortly after stopping the medicine.

Q: What is the difference between Novopyrine and a blood thinner?

A: Novopyrine is officially classified as a non-opioid analgesic and antipyretic. It is not considered a blood thinner itself. However, official documents warn that it can interfere with and reduce the antiplatelet effect of certain medicines that are used to thin the blood, such as low-dose aspirin.

Q: Can Novopyrine affect my ability to drive or operate machinery?

A: Official product information warns that the medicine can cause adverse effects such as drowsiness, fatigue, or low blood pressure. Due to these potential effects, official documents state that activities requiring alertness may be affected.

Q: Is Novopyrine associated with any skin reactions or rashes?

A: Yes, official regulatory documents list a range of potential skin reactions. This includes severe dermatological conditions, such as Stevens-Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN), which are rare but serious adverse reactions. Less severe skin reactions, such as rashes, are also documented.

Q: Is Novopyrine commonly prescribed by general practitioners?

A: The drug is widely used globally by various prescribers for its approved indications. However, some regulatory bodies and international health organizations advise that it should not be considered a first-line treatment, as advised by some health organizations, due to its risk profile requiring careful patient selection and monitoring.

Q: Are there different forms of Novopyrine, like a liquid or chewable?

A: Official regulatory documents list several dosage forms. The medicine is available in various forms, which may include oral tablets, drops (a liquid form), a solution for injection (parenteral use), and suppositories (rectal use).

Q: What is the shelf life or expiry of Novopyrine?

A: Official regulations require the manufacturer to conduct stability testing to establish an expiry date and appropriate storage conditions (e.g., cool, dry, dark). The specific shelf life of the product is determined by the manufacturer based on these tests and is printed on the product packaging.

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How should Novopyrine be stored and disposed of?

How to Store and Dispose of Novopyrine?

Regulatory documents define specific conditions for the storage and final disposal of Novopyrine (Sodium Metamizole) to maintain product integrity and ensure environmental safety.


Official Storage and Handling

Requirement Description
Storage Conditions Store in a cool, dry, and dark place at typical room temperature (e.g., 15 C to 25 C).
Handling & Packaging Keep container tightly closed and away from heat and oxidizing agents.
Child Safety Must be stored locked up and out of the sight and reach of children.

Disposal Requirements

Unused or expired product must not be disposed of in household trash, sewers, or surface water. Disposal is mandatory via an approved waste disposal plant or an authorized waste management company, in strict adherence to local and national regulations.

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

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