Antalgin

Quick links to important sections

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 Antalgin

What Type of Medicine is Antalgin and What Does it Contain?

Antalgin is a synthetic pharmaceutical preparation classified within the Non-steroidal Anti-inflammatory Drug (NSAID) pharmacological class, a category used for reducing discomfort and swelling. The preparation's active substance is Naproxen Sodium, which is the soluble sodium salt of the base compound, Naproxen. As a Propionic acid derivative, the formulation is a single-ingredient product delivered through the oral route, typically supplied in the form of a tablet.

The use of the sodium salt form is intended to enhance the speed of onset compared to non-sodium Naproxen formulations. This formulation is designed to facilitate rapid and complete absorption of the active compound.


General Purpose and Mechanism: What is Antalgin Used For?

The general purpose of Antalgin is to provide symptomatic relief by modulating the body's inflammatory response. Its function is achieved by inhibiting the Cyclooxygenase (COX) enzyme, which is involved in the body's synthesis of prostaglandins. Prostaglandins are the internal chemical messengers responsible for driving the physiological responses of pain, inflammation, and fever.

In instances of acute discomfort, the medication acts to dampen the intensity of the localized inflammatory process. This mechanism provides the benefit of reducing the symptomatic distress associated with various inflammatory conditions by providing effective and prolonged analgesia.

Regulatory References

  1. StatPearls

What side effects are possible with Antalgin?

Possible Side Effects and Safety Information

Official safety documentation for Antalgin (metamizole) is dominated by the risk of severe, rare adverse reactions, particularly hematologic and hypersensitivity disorders.

Serious Adverse Reactions

The most critical adverse reaction is Agranulocytosis, a sudden, sharp decrease in a specific type of white blood cell (neutrophils), which can lead to life-threatening infections. This reaction is classified as rare or very rare by regulatory bodies but is considered a severe, non-dose-dependent risk that can occur at any time during treatment or shortly after cessation.

Other serious adverse reactions include:

  • Acute Liver Injury/Failure: Cases of acute hepatitis and rapid-onset liver failure have been reported.
  • Severe Cutaneous Reactions: This includes Stevens-Johnson Syndrome (SJS) and Toxic Epidermal Necrolysis (TEN).
  • Anaphylactic Shock/Reactions: Acute, severe, and potentially fatal hypersensitivity responses.

Safety Restrictions and Monitoring

The medicine is formally contraindicated in patients with a history of agranulocytosis caused by Antalgin or similar drugs, and in those with impaired bone marrow function. Due to the seriousness of agranulocytosis, patients are advised to immediately stop the medicine and seek urgent medical attention if they develop symptoms like fever, chills, sore throat, or painful mucosal changes.

Population-Specific Contraindications

  • Pregnancy: The medicine is contraindicated during the third trimester of pregnancy due to risks of fetal renal impairment and closure of the ductus arteriosus.
  • Breastfeeding: Use is generally avoided because the medicine and its metabolites pass into breastmilk in significant amounts. Regulatory guidance recommends that breastmilk be discarded for 48 hours following a single administration.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory information describes potential manifestations and mandated actions in the event of an Antalgin (Naproxen Sodium) overdose. Suspected overdose requires immediate medical attention due to the documented risk of severe systemic outcomes.

Documented Overdose Manifestations

Common signs listed in regulatory sources include gastrointestinal distress such as nausea, vomiting, epigastric pain, and indigestion. Central Nervous System effects such as dizziness, drowsiness, confusion, and tinnitus may also be observed. Massive ingestion may be correlated with severe outcomes, including the risk of acute renal failure, metabolic acidosis, gastrointestinal perforation, seizures, and coma.

Official Emergency Actions

Since no specific antidote is known for Naproxen Sodium, treatment is strictly symptomatic and supportive, as directed by medical professionals. Procedures such as the administration of activated charcoal or gastric lavage may be considered. Continuous monitoring of vital signs and renal function is required in a hospital setting. Regulatory documents also note that elderly patients and those with pre-existing impaired renal or cardiac function face a greater risk of severe complications during an overdose event.

Therapeutic Uses of Antalgin

What Antalgin Treats: Main Uses and Benefits

Antalgin (Naproxen) is applied across domains where additional symptomatic support is needed, primarily for conditions presenting with symptoms related to physical discomfort or symptoms that become more disruptive during flare-ups. It is used in situations involving symptoms like pain, stiffness, and swelling associated with chronic joint diseases such as Rheumatoid Arthritis and Osteoarthritis, as well as acute episodes of gout, tendinitis, and bursitis. The medication may also assist with easing symptoms associated with acute or episodic changes, such as primary dysmenorrhea and certain headache syndromes.

The medication may be part of symptomatic management applied in addressing these manifestations and is relevant for managing symptoms that interfere with daily comfort. It provides support that helps ease the overall symptom burden and supports the patient during difficult episodes by easing distress during periods of heightened symptoms.

“The medication is relevant when supportive symptom management is appropriate during phases when symptoms become more noticeable.”

Quick Fact: Relief for Symptom Clusters That May Become Intense

Supportive Use for Fever and Specialized Pediatric Joint Pain

Antalgin supports the moderation of systemic symptoms, and is relevant for easing symptoms related to systemic imbalance, such as fever (pyrexia). It is considered relevant for easing symptoms related to inflammatory or irritative states associated with Polyarticular Juvenile Idiopathic Arthritis (JIA) in applicable patient groups. In these contexts, it supports general well-being during symptomatic phases and provides supportive relief when symptoms interfere with daily functioning.

Regulatory References

  1. NIH MedlinePlus overview of Naproxen

Eligibility and Restrictions for Use

Official Regulatory Eligibility Profile

The eligibility for Antalgin (metamizole) is strictly defined by regulatory contraindications and restrictions, primarily related to immunological and haematological status, specific health conditions, and patient age/physiological state.

Populations for whom use is Contraindicated (Must NOT use):

  • Patients with a history of agranulocytosis induced by metamizole or related drugs.
  • Individuals with impaired bone marrow function or diseases of the haematopoietic system.
  • Patients with known analgesic-induced asthma or intolerance to salicylates/NSAIDs.
  • Conditions such as acute intermittent hepatic porphyria or genetic G6PD deficiency.
  • Infants below 3 months of age or 5 kg body weight.
  • Women in the third trimester of pregnancy (due to risk of fetal renal/circulatory effects).

Restrictions and Conditional Use:

  • Age: Use is conditional on body weight in children. In the elderly and those with hepatic or renal impairment, caution is required, and repeated high doses must be avoided due to reduced elimination rates.
  • Lactation: Use is not recommended; if a single dose is administered, breast milk should be discarded for 48 hours.

What should I know about interactions with other medicines?

Antalgin (metamizole) is documented in official regulatory materials to interact with several medicinal products and substance categories, primarily through metabolic enzyme induction and pharmacodynamic competition.

Pharmacokinetic Interactions

Metamizole has been identified as an inducer of certain hepatic enzymes, including CYP2B6 and CYP3A4. This enzyme induction can lead to a clinically relevant reduction in the plasma concentrations of co-administered medicines that are substrates for these enzymes. Explicitly listed examples in regulatory documents include Bupropion, Ciclosporin, Efavirenz, Methadone, Sertraline, and Tacrolimus. Due to the potential for decreased efficacy of these co-administered drugs, close monitoring of the clinical response or drug plasma levels is necessary.

Pharmacodynamic Interactions

When used with low-dose acetylsalicylic acid (ASA) for cardioprotection, metamizole may interfere with ASA's antiplatelet effect. To mitigate this effect, patients on low-dose ASA are advised to take the ASA at least 30 minutes before metamizole. Concomitant use with Chlorpromazine requires caution due to a documented risk of severe hypothermia. Finally, metamizole may also reduce the plasma levels of Valproate.

Mechanism of Action

Central Inhibition of Nociceptive and Thermoregulatory Signals

This mechanism primarily involves the selective inhibition of cyclooxygenase (COX) enzymes within the central nervous system (CNS), particularly the spinal cord and brain. By suppressing the synthesis of key prostaglandins, the drug dampens the transmission of nociceptive signals and resets the body's thermoregulatory control, leading to lowering the central thermoregulatory set-point and reducing core temperature and decreasing nociceptive signal processing .


Modulation of Descending Pain-Inhibitory Pathways

The drug's effect extends beyond prostaglandin inhibition to include modulation of descending pain-inhibitory pathways. It interacts with and strengthens the activity of systems involved in endogenous analgesia and nociceptive signal attenuation, which results in further attenuation of nociceptive transmission and leading to a decreased excitability within the neural pain network.


Direct Relaxation of Visceral Smooth Muscle

A third distinct mechanism involves the direct modulation of signaling within visceral smooth muscle cells. By interfering with the chemical processes that regulate muscle tone and contraction, the drug promotes relaxation of these involuntary muscles. This mechanism results in reduced spontaneous and evoked contraction of internal smooth musculature.

Dosage and Administration Information

How to Use Antalgin: Official Administration Guidelines

Antalgin, containing Naproxen Sodium, is administered exclusively via the oral route. The standardized usage patterns for this non-steroidal anti-inflammatory drug (NSAID) are defined by guidance concerning dosage, frequency, and specific administration conditions.


Administration Scope

Feature Guideline
Route of administration Oral administration only, typically using immediate-release tablets.
Dosing schedule The maintenance dose for chronic conditions often involves 550 mg (Naproxen Sodium) administered twice daily (BID). Acute regimens, such as for gout, begin with 825 mg, followed by 275 mg every 8 hours. The total maintenance daily dose should not exceed 1100 mg.
Timing in relation to meals The tablet must be taken with a full glass of water. It may be taken with food or milk to help mitigate gastrointestinal discomfort.
Preparation requirements Controlled-release or delayed-release forms must be swallowed whole and must not be broken, crushed, or chewed, as this compromises the release mechanism.

Population-Specific Use and Procedural Conditions

Standardized protocols emphasize using the lowest effective dosage for the shortest duration. Usage in specific populations requires procedural considerations:

Feature Guideline
Age-group rules For pediatric use (e.g., Polyarticular Juvenile Idiopathic Arthritis), dosing is 10 mg/kg total daily dose, divided into two doses. In older adults, the prudent approach is to use the lowest effective dose.
Special conditions Dosage adjustment is required for patients with hepatic impairment. The medicine should be avoided in patients with advanced renal disease.

These instructions establish a protocol for use, defining the dosing frequency, the maximum amount permissible in a 24-hour period, and the necessary intake conditions to ensure adherence to the established standard.

Recent Clinical Evidence

Research evidence / Overview of studies


Research into Drug Action and Selectivity

Research has been conducted into the action of the drug. Studies have investigated whether this action related to changes in measures of pain and inflammation in conditions like osteoarthritis and acute injury.

The COX-2 selectivity of this drug was examined in comparison to traditional NSAIDs. Studies explored whether this selectivity was associated with differences in reported gastrointestinal adverse events.


Investigation of Pain Management

Acute Pain Trials

Research has focused on the drug's use following acute injuries, dental procedures, and post-operative pain.

A key meta-analysis described the time course of reported pain changes. Several trials investigated dosage frequency, examining if different schedules were associated with differences in the total reported pain relief over a week.

Chronic Pain Trials

For chronic pain, trials examined changes in pain scores over six months. Findings summarized the measured change in pain scores over this period, and research is ongoing regarding its use in long-term management.

In rheumatoid arthritis (RA), studies evaluated measured changes in morning stiffness and joint swelling.


Combination Therapy Research

Clinical studies have explored the combination of this drug with physiotherapy. Research compared this combination to monotherapy and examined whether it resulted in differences in patient mobility.


Research on Dose and Administration

Research examined the relationship between dose usage and reported cardiovascular adverse events. Studies investigated the drug’s absorption. Studies evaluated the drug's absorption profile in various administration settings.

Clinical trials generally did not report significant impairment of ability to drive or operate machinery, and research included the examination of potential effects like dizziness.

Key Studies & References

  1. The use of combination therapy in rehabilitation of patients with hip osteoarthritis – preliminary report
  2. COX-2 Inhibitors: What They Are, Uses & Side Effects - Cleveland Clinic

Frequently Asked Questions (FAQ)

Common questions about Antalgin (FAQ)

Q: Is Antalgin the same as common over-the-counter painkillers?

Antalgin (Naproxen Sodium) is classified as a Non-Steroidal Anti-inflammatory Drug (NSAID). This is the same class of medication as several common painkillers found over the counter. However, official information shows that Antalgin is most often available by prescription in higher strengths, while lower doses of Naproxen are often available without a prescription.

Q: Why is Antalgin sometimes available only by prescription?

Antalgin is available by prescription primarily in higher strengths that are necessary for managing certain chronic conditions, such as some types of arthritis or acute gout. Regulatory agencies specify that these higher doses and extended-release forms require a prescription to ensure patient safety and proper monitoring by a healthcare provider.

Q: How quickly does Antalgin usually start working?

Regulatory documents indicate that Antalgin is formulated as a sodium salt, which is designed for rapid and complete absorption into the body. Official studies show that this formulation allows the drug to reach its peak concentration in the blood faster than non-sodium Naproxen forms.

Q: How long do the effects of Antalgin last after taking it?

Official regulatory information notes that the drug has a relatively long elimination half-life, meaning it remains active in the body for an extended period. This duration is discussed in regulatory documents concerning its typical usage pattern for sustained relief.

Q: Is Antalgin known to cause drowsiness or affect driving?

Official regulatory documents list side effects that may include dizziness, drowsiness, lightheadedness, and difficulty concentrating. Due to these potential effects, official warnings state that activities requiring mental alertness, such as driving or operating machinery, should be approached with caution until a person knows how the medicine affects them.

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

Commonly reported side effects listed in official documents often include mild symptoms related to the digestive system, such as heartburn, stomach pain, nausea, flatulence, and constipation. Other general effects like headache and dizziness are also frequently reported.

Q: Is it true that Antalgin can cause stomach upset?

Yes, official safety information indicates that gastrointestinal symptoms, including stomach upset, are common side effects. Regulatory guidance notes that it may be taken with food, milk, or an antacid as a way to potentially lessen this discomfort.

Q: Can Antalgin be taken for mild pain, or is it only for severe cases?

Official regulatory documents list the management of 'mild to moderate pain' as one of the primary indications for the use of Antalgin. It is used for acute symptomatic relief, alongside its indications for more severe, chronic conditions like arthritis or acute gout.

Q: What is the difference between Antalgin and other NSAIDs?

Antalgin (Naproxen Sodium) is an NSAID with specific features, including its formulation as a sodium salt for rapid absorption. Official regulatory information also discusses its pharmacological properties, noting that it has a low selectivity profile for the COX-2 enzyme compared to certain other drugs in the same class.

Q: Can people with a history of allergies use Antalgin?

Regulatory documents state that Antalgin is formally contraindicated if a person has a history of allergic-type reactions to aspirin or any other NSAID. This means it is avoided in those who have a history of allergic-type reactions to aspirin or any other NSAID, including conditions such as hives or analgesic-induced asthma.

Q: Can Antalgin be taken on an empty stomach?

Official guidance indicates the medicine can be taken with or without food. However, because stomach upset is a commonly reported effect, taking it with food, milk, or an antacid is often suggested to help reduce the potential for gastrointestinal discomfort.

Q: How is Antalgin different from the active ingredient in 'Tylenol'?

Antalgin (Naproxen Sodium) is an NSAID, a drug class defined by its ability to inhibit prostaglandin synthesis to reduce pain and inflammation. Tylenol’s active ingredient (acetaminophen/paracetamol) is not classified as an NSAID, and its pain-relieving mechanism is understood to be different.

Q: Does Antalgin affect blood clotting?

Yes, regulatory documents indicate that Antalgin affects blood clotting. Due to its mechanism, it can interfere with the antiplatelet effect of low-dose aspirin and may increase the risk of bleeding when taken alongside other blood-thinning agents.

Q: What is the general duration of treatment described for Antalgin?

Regulatory documents describe the usage principle as utilizing the lowest effective dose for the shortest possible duration. This approach is intended to minimize the potential for serious side effects, consistent with achieving the individual patient’s treatment goals.

Q: What does the term 'non-narcotic analgesic' mean in relation to Antalgin?

This term, used in regulatory descriptions, indicates that Antalgin is a pain reliever (analgesic) that is not a controlled substance. It does not carry the risk of physical dependence or addiction typically associated with narcotic (opioid) pain medications.

Q: Can Antalgin affect the results of lab tests?

Official product information indicates that Antalgin may potentially cause false results in certain specific laboratory tests. These include tests that measure urinary 17-ketogenic steroids and 5-hydroxyindoleacetic acid.

Q: Are there any common foods or drinks that should be avoided with Antalgin?

Regulatory warnings specifically caution against the consumption of three or more alcoholic drinks every day while using Antalgin. Heavy alcohol use, when combined with NSAIDs, is known to significantly increase the risk of serious stomach bleeding.

Q: Are there long-term effects associated with using Antalgin regularly?

Official Boxed Warnings highlight that long-term or high-dose use of Antalgin increases the risk of serious side effects. These include serious cardiovascular thrombotic events (such as heart attack or stroke) and serious gastrointestinal adverse events (such as bleeding or ulceration).

Q: Does Antalgin carry a risk of dependence or addiction?

Official regulatory classification lists Antalgin as a Non-Steroidal Anti-inflammatory Drug (NSAID). As such, it is not classified as a controlled substance and does not carry the risk of physical dependence or addiction typically associated with narcotic pain relievers.

Q: What should a person do if they miss a scheduled dose of Antalgin?

Official patient information states that if a dose is missed, it should be taken as soon as it is remembered. However, if it is almost time for the next scheduled dose, the prior dose is typically omitted to avoid taking a double dose. Following the regular schedule is the advised practice.

Q: Does Antalgin have a 'black box warning' in the United States?

Yes, official FDA labeling requires Antalgin (Naproxen Sodium) to carry a Boxed Warning. This warning is used to highlight the potential for serious, life-threatening risks, specifically cardiovascular thrombotic events (like heart attack or stroke) and serious gastrointestinal side effects (like bleeding or perforation).

Q: Can a person take Antalgin if they have high blood pressure?

Regulatory documents describe the need for caution concerning the use of Antalgin in patients who have high blood pressure (hypertension). NSAIDs are noted to potentially lead to new or worsened hypertension and may reduce the effectiveness of some blood pressure medications, necessitating careful patient monitoring.

Q: Does Antalgin interact with common cold or flu medicines?

Official patient counseling information notes that using Antalgin with other products containing NSAIDs is not recommended. Many common cold and flu medicines contain NSAIDs, and combining them increases the risk of serious side effects, especially gastrointestinal bleeding.

Q: What is the recommended approach if someone experiences a minor side effect from Antalgin?

Regulatory guidance instructs patients to immediately stop the medication and seek urgent medical attention for any signs of a severe reaction. For minor, non-serious side effects, the general practice described is to continue use if the side effect is minor and non-serious, unless a healthcare provider advises otherwise.

Q: What are the recognized symptoms of an Antalgin overdose?

Official regulatory information states that symptoms of an overdose may include extreme drowsiness, confusion, severe headache, and signs of stomach distress like nausea, vomiting, or stomach pain. Overdose can also potentially cause tinnitus (ringing in the ears) and signs of gastrointestinal bleeding.

Q: Can Antalgin be used by individuals who are already taking blood thinners?

Regulatory documents include warnings that Antalgin should be used with extreme caution with anticoagulants (blood thinners), such as warfarin. Combining the two medications significantly increases the risk of serious and potentially life-threatening gastrointestinal bleeding.

Q: Is there evidence that Antalgin works better for certain types of pain than others?

Regulatory documents list specific indications for which the drug has been formally approved and shown to be effective. These include treating pain associated with chronic conditions like rheumatoid arthritis and osteoarthritis, as well as acute conditions like gout and menstrual cramps (primary dysmenorrhea).

How should Antalgin be stored and disposed of?

How to Store and Dispose of Antalgin (Naproxen Sodium Tablets)

Official regulatory labeling dictates specific conditions for the storage and disposal of Antalgin tablets.

Storage Conditions

Antalgin must be stored at Controlled Room Temperature, which is between 20 C and 25 C (68 F and 77 F). The product requires protection from moisture, high humidity, and excessive heat. Tablets must be dispensed in a tight container and this container must be kept tightly closed to maintain product stability. Consistent with safety mandates, the medicine must be stored out of the sight and reach of children.

Disposal Instructions

Disposal of unused or expired tablets should prioritize an official drug take-back program. If a take-back program is unavailable, the tablets must not be flushed down the toilet or poured down a sink. Instead, they should be disposed of in the household trash following the guidelines for non-flushable medicines and discarded according to local regulations.

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

Available in countries:

Equivalent of Antalgin found in:

A-Z Index: