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Pirinovag

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Pirinovag

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Treatment option:

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.

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Overview of Pirinovag

Quick Facts

Property Description
Active ingredient Dipyrone (Metamizole)
Form Tablet, Oral drops, Solution for injection
Pharmacological class Analgesic, Antipyretic, Spasmolytic
General purpose Relief of acute pain, fever, and spasm
Origin Synthetic compound (Pyrazolone derivative)

Core Identity and Pyrazolone Classification

Pirinovag is a single-agent Pharmaceutical preparation containing the active substance Dipyrone, which is also scientifically and globally recognized as Metamizole. This substance is a Synthetic compound chemically derived from the Pyrazolone derivative group, establishing its distinct pharmacological profile. The compound is a potent non-opioid analgesic indicated for the management of severe pain where typical over-the-counter options may be insufficient.

Therapeutic Profile: Analgesic, Antipyretic, and Spasmolytic Type

The general purpose of Pirinovag is defined by its powerful triple-action Pharmacological class, serving as a potent Analgesic, an effective Antipyretic, and a valuable Spasmolytic agent. Metamizole is utilized for its antipyretic properties, particularly in cases of fever unresponsive to other agents, and for acute pain management. The primary action involves the modulation of pain signals and temperature regulation, chiefly through the inhibition of Prostaglandin synthesis.

Compositional Form: Preparation and Vehicle

Pirinovag's physical identity is defined by its common Dosage form(s): the solid Tablet, Oral drops for flexible dosing, and the Solution for injection for acute needs. The composition requires a single active ingredient, Metamizole (Dipyrone), which is combined with standard pharmaceutical excipients for the tablet form or suspended in an aqueous vehicle for liquid solutions. The availability of these distinct forms ensures versatility in clinical application, allowing administration through the oral, rectal, or parenteral routes to match the required speed and severity of the patient's condition.

Regulatory References

  1. Metamizole (Dipyrone) | NIH LiverTox
  2. MedlinePlus | Drug Information
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What side effects are possible with Pirinovag?

Possible Side Effects and Safety Information

The safety profile of Pirinovag (Dipyrone/Metamizole) is defined by officially documented risks, primarily focusing on rare but severe adverse reactions as classified by regulatory authorities. The adverse events are categorized into System-Organ Classes (SOCs), which include the Blood and Lymphatic System, Immune System, Skin and Subcutaneous Tissues, and Hepatobiliary Disorders.


Officially Documented Adverse Reactions

The regulatory safety profile highlights the risk of Serious Adverse Reactions. These include the blood disorder Agranulocytosis, which is classified as Very Rare and may occur at any time during treatment. Life-threatening immunological events such as Anaphylactic Shock, classified as Rare, and severe skin reactions, including Stevens-Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN), are also documented.

Classification Example Adverse Reaction
Very Rare Agranulocytosis, Thrombocytopenia, SJS/TEN
Rare Anaphylactic Reactions, Leukopenia
Not Known Drug-induced Liver Injury (Hepatitis)

Less severe but officially noted effects may involve the gastrointestinal system, such as nausea or vomiting. The excretion of metabolites may result in a harmless red discoloration of the urine, which is a documented safety note.


Regulatory Safety Constraints

Official labeling specifies constraints for use. The medicine is Contraindicated in individuals with a known hypersensitivity to the pyrazolone group of substances or a history of drug-induced agranulocytosis. Population-specific notes include the contraindication during the last trimester of pregnancy due to potential risks to the fetus and while breastfeeding. Safety cautions also apply to patients with pre-existing hepatic impairment or renal impairment.

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Overdose and Emergency Response

Overdose with Pirinovag (Dipyrone/Metamizole) may result in documented clinical manifestations that range from mild gastrointestinal symptomatology and somnolence to severe systemic toxicity. The official regulatory profile highlights the potential for serious outcomes affecting major organ systems, including acute renal insufficiency, acute liver injury, and significant cardiovascular instability such as severe hypotension or shock.

The most critical regulatory-mandated response pertains to signs of myelotoxicity. Urgent medical assistance must be sought immediately if any symptoms indicative of agranulocytosis or other blood disorders occur, such as unexplained fever, sore throat, or chills. If such symptoms appear, the medicine must be stopped immediately to prevent further risk. Regulatory authorities require that a blood test (including a differential blood count) be performed without delay in these circumstances to determine the severity.

In cases of toxicity, no specific antidote is known. Management is officially limited to symptomatic and supportive measures. For recent oral ingestion, measures to limit absorption, such as the administration of activated charcoal, may be described for use. In severe toxicity, procedures to accelerate the removal of the substance, such as haemodialysis, are officially described management options due to the dialyzable nature of the substance's metabolites.

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Therapeutic Uses of Pirinovag

What Pirinovag Treats: Main Uses and Benefits

Pirinovag (Dipyrone/Metamizole) is commonly used across domains where additional symptomatic support is needed to address acute or disruptive symptom patterns. It is relevant when symptoms create noticeable physiological strain and may support symptomatic relief across key therapeutic domains: pain, fever, and spasm. Its use is indicated for treating severe pain and fever that cannot be controlled with other treatments.

The medication is generally used to help manage symptoms associated with conditions like postoperative pain, trauma, cancer-related pain, intense renal colic, biliary colic, intestinal spasms, and high-grade fever that is unresponsive to standard treatments. This approach supports patients during difficult episodes by easing distress and assists with maintaining functional stability when symptoms interfere with routine activities.


Quick Fact: Symptomatic Management for Acute Symptom Clusters

Symptom Axis Use Classification Patient Benefit
Severe Pain Postoperative/Traumatic Helps ease the overall symptom burden.
Cramping/Colic Episodic Visceral Spasm Supports patients during episodes of heightened discomfort.
High Fever Systemic Imbalance Contributes to improved comfort.

Regulatory References

  1. European Medicines Agency on Metamizole
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Eligibility and Restrictions for Use

Official Eligibility and Contraindications

Regulatory agencies strictly define the populations eligible for Pirinovag (Dipyrone/Metamizole) use, focusing on eliminating specific high-risk groups.

Contraindicated Populations (Must Not Use)

The medicine is absolutely contraindicated for individuals with:

  • A history of agranulocytosis or known hypersensitivity to Metamizole or other pyrazolone derivatives.
  • Impaired bone marrow function or diseases of the haematopoietic system.
  • Specific genetic deficiencies, such as G6PD deficiency or acute intermittent hepatic porphyria.
  • Infants under the age of 3 months or with a body weight below 5 kg.
  • Use is prohibited during the third trimester of pregnancy.

Conditional and Restricted Use

  • Children over the minimum age/weight threshold are eligible, but the fixed-dose tablet form is generally not recommended for those under 15 years old due to weight-based dosing requirements.
  • Use requires caution and potential dose reduction in patients with pre-existing severe renal or hepatic impairment.
  • During lactation, repeated use is generally not recommended, and a 48-hour discard period for breast milk is required after a single administration.
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What should I know about interactions with other medicines?

Pirinovag (Dipyrone/Metamizole) enters into specific interaction patterns with other medicines, which are defined by its effects on drug elimination and through direct functional reinforcement. The official regulatory profile documents interactions that modify the exposure of co-administered drugs and those that create combined toxicity risks.

Pharmacokinetic Interactions: Exposure Reduction

Co-administration of Pirinovag can lead to a clinically significant reduction in the plasma concentration of several medicines. This reduction in exposure is officially documented for the immunosuppressants Cyclosporine and Tacrolimus, as well as for Bupropion, Methadone, and Valproic acid. These outcomes are typically associated with Pirinovag's role as an enzyme inducer.

Pharmacodynamic Interactions and Restrictions

The medicine is formally contraindicated for use with other pyrazolone or pyrazolidine derivatives due to a documented risk of shared haematologic toxicity.

A critical pharmacodynamic interaction exists with Acetylsalicylic acid (ASA) when used for cardioprotection, as Pirinovag may inhibit its antiplatelet effect. To manage this antagonism, the regulatory literature suggests a mandatory separation: ASA should be administered at least 30 minutes before Pirinovag. Combining Pirinovag with Methotrexate carries an additive risk of haematologic toxicity, a risk noted to be more severe in elderly patients. Co-administration with Chlorpromazine may result in a risk of severe hypothermia, and use with antibiotics may mask the early symptoms of agranulocytosis.

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Mechanism of Action

Pirinovag (Dipyrone/Metamizole) exerts its effects through a multi-modal pharmacodynamic mechanism mediated by its active metabolites, which rapidly access the central nervous system ( CNS).

Central Modulation of Pain and Temperature

This domain involves two distinct CNS pathways: inhibition of the central COX-3 isoenzyme and the modulation of descending pain control pathways via CB1 cannabinoid and Opioidergic systems. These combined actions suppress the intensity of nociceptive signaling and reset the hypothalamic set-point, resulting in the suppression of nociceptive signal transmission and promoting the dissipation of heat and the adjustment of the core temperature set-point.

Visceral Smooth Muscle Spasmolysis

Operating peripherally, this mechanism interferes with the biochemical signals that control intracellular calcium ( Ca^2+) release within smooth muscle tissue (e.g., in the gastrointestinal or urogenital tracts). This action leads to decreased basal tone and contractility of the smooth muscle and the restoration of the smooth muscle tissue to a lower resting state.

Mechanistic Limitations

The mechanism is constrained by the presence of peroxidase enzymes in peripheral, inflamed tissues. These enzymes significantly reduce the inhibitory effect on COX enzymes outside the CNS, resulting in only limited COX inhibition in peripheral, peroxidase-rich environments.

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Dosage and Administration Information

Pirinovag, containing Dipyrone (Metamizole), is intended for short-term management and is available for multiple administration routes to accommodate acute needs. The medicine is utilized for Oral (tablets, drops), Intravenous (IV), Intramuscular (IM), and Rectal administration.

Official Dosing and Frequency

Standard administration protocols include specific maximum limits. For adults (aged 15 years and over with a body weight >53 kg), the maximum single oral dose is 1,000 mg (1 g), which may be taken up to four times daily. The total maximum dose in a 24-hour period should not exceed 4,000 mg (4 g) for oral use. A minimum interval of 6 to 8 hours is required between doses to prevent exceeding the daily maximum limit.

Administration Route Maximum Single Dose Maximum Daily Dose
Oral (Adults) 1,000 mg 4,000 mg
Parenteral (IV/IM) 1,000 mg (typically) 5,000 mg

Procedural and Population Rules

Administration via the intravenous route requires a specific procedure: the injection must be administered very slowly over several minutes. For specific populations, a dose reduction is typically indicated for older adults and debilitated patients due to the potential for prolonged drug elimination. Similarly, for patients with existing renal or hepatic impairment, the avoidance of repeated high doses is standard, though short-term use may not require a formal dose adjustment.

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Recent Clinical Evidence

Pirinovag: Overview of Studies


Research Scenarios in Acute Pain and Postoperative Settings

Research has explored Pirinovag in numerous Randomized Controlled Trials (RCTs) and subsequent large Meta-analyses focused on outcomes related to physical discomfort. These studies primarily examined its use in conditions associated with acute or disruptive episodes, such as pain following surgical procedures and visceral colic. Findings describe patterns observed in these studies where pain intensity measurements were tracked in the observed populations during the acute observation periods. The evidence derived from these settings relates mainly to short-term symptom patterns, with trials often comparing the measurements collected against those recorded for placebo, opioids, and other non-opioid medications.

The large structure of acute pain evidence suggests that follow-up durations were limited, with most data reflecting short-term exposure. There remains limited information for how this medicine may function in a preventive role or within long-term, complex analgesic regimens.


Research Scenarios in High Fever (Antipyresis) Settings

The medicine was studied for conditions associated with temporary physiological imbalance, specifically high-grade fever. Studies monitored outcomes related to systemic imbalance, including core body temperature change over acute time intervals, and recorded measurements against those observed with comparator agents. Findings describe patterns of core body temperature change measured during the study period, primarily across short observation windows of up to 24 hours.

However, data for certain groups remain insufficient due to a scarcity of robust, direct comparative studies in the general adult population. While studies in children were evaluated in some systematic reviews, the sample sizes were modest in the available trials for this patient group.


Research Scenarios in Chronic Pain Settings (Cancer-Related Pain)

For chronic conditions, such as cancer-related pain, the evidence landscape is primarily supported by a limited number of RCTs supplemented by Systematic Reviews. The research examined specific outcomes related to managing ongoing symptoms, including quantification of pain intensity and monitoring of opioid usage patterns.

High-quality RCTs are urgently needed to clarify the role of the medicine in this setting. Furthermore, comparative evidence is lacking for intermediate or long-term outcomes, and certainty remains low due to limitations in study volume and design quality. The current research does not provide comprehensive insight into its role in monitoring symptoms over an extended duration, meaning long-term effects are not fully established.

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Frequently Asked Questions (FAQ)

Common questions about Pirinovag (FAQ)


Q: Why do people say Pirinovag feels different than what they expected?

Official documentation describes the medicine's mechanism of action as distinct from other common pain relievers. Its analgesic effect involves actions within the central nervous system ( CNS), such as modulating pain control pathways and inhibiting a central COX enzyme. This central profile, coupled with only limited activity in peripheral, inflamed tissues, is cited as a reason for its unique effect.

Q: How long does it typically take before I start to feel anything after taking Pirinovag?

Studies on the medicine's absorption indicate a quick processing profile. Following oral administration, the main active component is typically processed rapidly, with the highest concentration in the blood plasma often reached between 1.2 to 2.0 hours.

Q: Can Pirinovag cause issues with my stomach or digestion?

Yes, regulatory documents list less severe but officially noted effects that involve the gastrointestinal system. These commonly reported issues include nausea, vomiting, abdominal pain, and general indigestion (dyspepsia).

Q: Is it common to have a mild headache when starting Pirinovag?

The safety profile does not consistently list headache as a frequently reported side effect. However, other neurological effects, such as dizziness or lightheadedness, are commonly reported in clinical settings.

Q: Can Pirinovag affect blood pressure readings?

Yes, official warnings exist regarding blood pressure effects. The regulatory information requires that administration of the injection form, in particular, must be given very slowly over several minutes. This specific condition is stated to ensure proper use and manage potential effects on circulation.

Q: What does 'contraindicated' mean in the official documents for Pirinovag?

A 'contraindication' means that the medicine mathbfmust mathbfnot mathbfbe mathbfused because a documented health risk significantly outweighs any potential benefit. Examples for this medicine include a history of drug-induced agranulocytosis and use during the last trimester of pregnancy.

Q: Is Pirinovag known to interact with common pain relievers like ibuprofen?

The regulatory profile specifically documents a critical interaction with mathbfAcetylsalicylic mathbfacid ( ASA) when it is used for cardioprotection. The documentation does not list an interaction with ibuprofen, as Pirinovag's mechanism of action is chemically distinct from conventional non-steroidal anti-inflammatory drugs ( NSAIDs). The official warnings focus on the documented ASA interaction.

Q: What are the official restrictions for combining Pirinovag with alcohol?

Official product information notes that use with alcohol requires caution. The regulatory documentation suggests this is because the potential impact of alcohol on the medicine's effects and safety profile is not fully established.

Q: How long does the effect of one dose of Pirinovag last?

Studies and official information indicate that the duration of the analgesic effect for a single dose is typically cited as lasting approximately mathbf4 mathbfto mathbf6 mathbfhours. The recommended minimum time interval between doses is set at mathbf6 to mathbf8 mathbfhours to maintain safety.

Q: What should I do if I accidentally miss a time to take Pirinovag?

Official documentation does not provide a specific instruction for a missed dose. The most important regulatory instruction is to strictly adhere to the mandated minimum interval of mathbf6 to mathbf8 mathbfhours between doses. This interval must be respected to prevent exceeding the maximum allowable daily dose.

Q: What are the most commonly reported side effects in clinical studies for Pirinovag?

While the regulatory profile highlights the risk of mathbfVery mathbfRare but severe events like Agranulocytosis, less severe effects are commonly reported in clinical settings. These include gastrointestinal issues such as nausea, vomiting, abdominal pain, and neurological effects such as dizziness or lightheadedness.

Q: What should I look out for if I'm concerned about a serious side effect from Pirinovag?

Official safety information suggests awareness of the symptoms of Agranulocytosis. These serious symptoms include the sudden onset of mathbfhigh mathbffever, mathbfchills, mathbfsore mathbfthroat, and mathbfpainful mathbfsores on the moist inner body surfaces ( mucosa). These can be observed at any time during treatment or shortly after stopping the medicine.

Q: Does the time of day matter when taking Pirinovag?

The official administration instructions focus strictly on the dosage quantity and the time interval between doses. The regulatory documentation does not mandate a specific time of day for administration, allowing flexibility as long as the minimum mathbf6 to mathbf8 mathbfhour interval is maintained.

Q: Is Pirinovag safe to use while breastfeeding or pregnant?

Use is mathbfcontraindicated during the mathbflast mathbftrimester of pregnancy due to known fetal risks. For the first two trimesters, use is generally discouraged. During lactation, repeated use should be avoided; after a single administration, official guidelines require a mathbf48-mathbfhour mathbfdiscard mathbfperiod for breast milk.

Q: What happens if Pirinovag is stopped suddenly?

The most serious side effect, Agranulocytosis, is a known risk that can be observed at any time, including mathbfshortly mathbfafter mathbfstopping the medicine. Furthermore, in cases of documented misuse that lead to dependence, clinical reports have noted the occurrence of withdrawal symptoms when the medicine is stopped abruptly.

Q: Why do some people report feeling dizzy when they first start Pirinovag?

Dizziness and lightheadedness are documented in the regulatory profile as commonly reported side effects of the medicine. These neurological effects are usually mild and may be more noticeable when first starting treatment.

Q: How do researchers measure the success of Pirinovag in clinical trials?

In clinical trials, the success of the medicine is measured using established endpoints. These typically include the mathbfquantification mathbfof mathbfpain mathbfintensity (or reduction of pain), mathbfopioid-mathbfsparing mathbfeffects, and mathbfcore mathbfbody mathbftemperature mathbfchange in fever studies.

Q: What are the signs of using too much Pirinovag?

Signs of a severe overdose can include serious symptoms such as mathbfdifficulty mathbfbreathing, mathbfseizures, mathbfconfusion, and mathbfcardiovascular mathbfissues. These signs may indicate multiple organ failure, and mathbfurgent medical assistance is required if an overdose is suspected.

Q: Why are people talking about a new study related to Pirinovag's use?

The regulatory documents and research overviews note that mathbfhigh-mathbfquality mathbfRandomized mathbfControlled mathbfTrials ( RCTs) are mathbfurgently mathbfneeded to clarify the medicine's role in chronic pain settings. New research is frequently published, often focusing on comparing its safety profile against other analgesics or addressing these documented evidence gaps.

Q: Can people with diabetes use Pirinovag?

The current official regulatory information reviewed mathbfdoes mathbfnot mathbflist mathbfdiabetes as a formal contraindication or special precaution. However, caution is required when taking any medication for a patient with a chronic medical condition.

Q: What are the common misuses of Pirinovag that people discuss online?

Clinical reports have noted limited cases of misuse involving chronic high-dose use that led to mathbfpsychological mathbfdependence or mathbfaddiction in certain individuals. This is a rare form of dependence, sometimes linked to the medicine's documented anxiolytic-like effects.

Q: Is Pirinovag known to cause weight changes?

Based on the current official product information and safety documentation reviewed, mathbfweight mathbfchange mathbfis mathbfnot mathbflisted as a reported adverse reaction or side effect.

Q: Can Pirinovag be used by older adults?

Yes, older adults can use this medicine. However, official guidelines advise a mathbfdose mathbfreduction for older adults and debilitated patients. This adjustment is recommended due to the potential for prolonged drug elimination in these populations.

Q: Are there any age restrictions mentioned for Pirinovag?

Yes, the medicine is mathbfcontraindicated for mathbfinfants mathbfunder mathbf3 mathbfmonths or with a mathbfbody mathbfweight mathbfbelow mathbf5 mathbfkg. The fixed-dose tablet is generally not recommended for those under mathbf15 mathbfyears mathbfold due to the need for precise weight-based dosing.

Q: How is Pirinovag's use described for people with kidney problems?

Official guidelines advise patients with pre-existing mathbfrenal mathbfimpairment to avoid mathbfrepeated mathbfhigh mathbfdoses. While short-term use may not require a formal dose adjustment, use in these patients requires caution due to the drug’s elimination profile.

Q: Why are there warnings about using Pirinovag with certain heart medications?

Warnings exist primarily because Pirinovag is documented to mathbfinhibit mathbfthe mathbfantiplatelet mathbfeffect mathbfof mathbfAcetylsalicylic mathbfacid ( ASA) when ASA is used for cardioprotection. The official profile also notes that it can decrease the activities of certain blood pressure medications.

Q: What are the main goals of the Pirinovag treatment?

The main goals of treatment are defined by the medicine's triple-action mathbfPharmacological mathbfclass. The official purpose is to provide potent relief for mathbfAcute mathbfPain ( Analgesia), mathbfHigh mathbfFever ( Antipyresis), and mathbfVisceral mathbfSpasms ( Spasmolysis).

Q: Is Pirinovag meant to be a short-term or long-term medicine?

The medicine is officially sanctioned for mathbfshort-mathbfterm mathbfmanagement of acute needs. The evidence landscape for long-term outcomes remains limited, and the long-term effects of chronic use are mathbfnot mathbffully mathbfestablished in regulatory documents.

Q: Does Pirinovag interact with common contraceptives?

The official regulatory profile reviewed mathbfdoes mathbfnot mathbflist an interaction with common hormonal or non-hormonal contraceptives. Pharmacokinetic interactions are primarily documented for specific medicines, including immunosuppressants like Cyclosporine and antiepileptics like Valproic acid.

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How should Pirinovag be stored and disposed of?

How to Store and Dispose of Pirinovag?

Regulatory documentation defines specific rules for the storage and disposal of Pirinovag (Metamizole) to ensure product stability and safety.

Storage Requirements

  • Temperature and Protection: The medicine must be stored at a temperature below 25°C and kept in the original package to protect from light.
  • Freezing: The solution for injection must not be stored in the freezer.
  • Child Safety: All forms of the medicine must be kept out of the sight and reach of children.
  • In-Use Stability: Any remaining solution for injection must be discarded immediately after opening.

Disposal Instructions

Official disposal instructions mandate that unused or expired Pirinovag must not be thrown away via wastewater or household waste to protect the environment. Disposal must occur according to local regulations by returning the product to a pharmacy or official collection point.

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

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