Antalgin (Indometacin)

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Overview of Antalgin (Indometacin)


Quick Facts: Indometacin

This table summarizes the core identity elements of the active substance, Indometacin.

Property Description
Active Ingredient Indometacin (or Indomethacin)
Form Available as capsules, tablets, suppositories, gels, and injectable solutions
Pharmacological Class Nonsteroidal Anti-inflammatory Drug (NSAID)
Common Use Symptomatic relief of inflammation, pain, and fever
Origin Synthetic compound (Indoleacetic acid derivative)

Identity and Classification

Indometacin is a powerful synthetic compound that serves as the active ingredient in medicine marketed under brand names such as Antalgin, belonging to the broad class of Nonsteroidal Anti-inflammatory Drugs (NSAIDs). This compound is chemically specified as an indoleacetic acid derivative, a structural feature that differentiates it from other common NSAIDs like Ibuprofen and Naproxen. Indomethacin is used to reduce inflammation and pain in the body. As a single active ingredient product, it functions through the inhibition of prostaglandin synthesis.


General Purpose and Forms

The fundamental purpose of Indometacin is to provide robust symptomatic relief through a triple action: reducing inflammation, alleviating pain, and lowering elevated body temperature. This action is mediated by the compound's potent, nonselective inhibition of the cyclooxygenase (COX) enzyme. Indometacin's diverse forms—including capsules, suppositories, and gels—facilitate both systemic and local administration. This wide array of formulations ensures flexibility in application, allowing the compound to be appropriately utilized depending on whether the need is for whole-body relief via oral or rectal routes, or localized application via the topical route.

Regulatory References

  1. NIH MedlinePlus Drug Information on Indomethacin
  2. MedlinePlus Indomethacin
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What side effects are possible with Antalgin (Indometacin)?

Official Description of Possible Side Effects and Safety

The safety profile for Indometacin, as documented in official regulatory sources, involves adverse reactions categorized by frequency and the body system affected. These classifications reflect how government regulatory documents organize and communicate the medicine’s safety profile.

Commonly Documented Adverse Reactions

Reactions generally classified as common (occurring in at least 1 in 100 patients) often involve the Nervous System and Gastrointestinal systems. These typically include headache (often noted as dose-related), dizziness, vertigo, dyspepsia (indigestion), nausea, vomiting, abdominal pain, and fluid retention (edema).

System-Organ Classes and Seriousness

The most significant safety patterns are associated with the risk of Serious Adverse Reactions. Officially documented risks include life-threatening Gastrointestinal Ulceration, Bleeding, and Perforation, which can occur without prior warning. Furthermore, the official labeling for Indometacin highlights an increased risk of serious Cardiovascular Thromboembolic Events, such as Myocardial Infarction and Stroke, which can occur early in the course of treatment and may increase with prolonged use.

Classification Tier Associated Risks (as per regulatory documents)
Rare Risks Severe hepatic reactions, blood dyscrasias (e.g., agranulocytosis), and severe dermatological reactions.
Serious Risks Gastrointestinal bleeding/perforation, Thromboembolic events (MI, stroke).

Population-Specific and Exposure Constraints

Regulatory texts explicitly note that older adults have a documented increased frequency and severity of adverse reactions, particularly the serious gastrointestinal complications. Safety limitations formally restrict use in individuals with active peptic ulcer disease, active gastrointestinal bleeding, or severe, uncontrolled heart failure. The risk of serious events is noted to increase with long-term exposure.

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Overdose and Emergency Response

Overdose Map: Overdose and when to seek help — Official Regulatory Information for Antalgin (Indometacin)


Overdose Scope

Documented overdose presentations:

  • Gastrointestinal: Nausea, vomiting (potentially with blood), diarrhea, stomach pain, and documented risk of internal bleeding or perforation.
  • Central Nervous System (CNS): Severe headache, dizziness, mental confusion, disorientation, lethargy, drowsiness, agitation, and unsteadiness.
  • Cardiopulmonary/Systemic: High or low blood pressure, increased heart rate, chest pain, and edema (swelling).
  • Renal/Sensory: Little or no urine output, blurred vision, and ringing in the ears (tinnitus).

Physiological systems affected (as stated in label):

  • Gastrointestinal system, Central Nervous System, Cardiovascular system, and Renal system are the primary organ systems described in the overdose documentation.

Dose-related or exposure-related factors (if applicable):

  • Overdose occurs when someone takes more than the normal or recommended amount of the medicine.
  • A large overdose is officially associated with being very harmful and potentially fatal.

Population-specific overdose notes (if applicable):

  • A large overdose can be very harmful to children and adults.

Emergency-response statements (as written in official documents):

  • Treatment is symptomatic and supportive.
  • The stomach should be emptied as quickly as possible if the ingestion is recent, potentially utilizing gastric lavage or activated charcoal.
  • No specific antidote for Indometacin toxicity is available.
  • Monitoring includes measuring vital signs (temperature, pulse, breathing rate, and blood pressure), as well as performing blood and urine tests and an Electrocardiogram (ECG).

When immediate medical help is required (label-derived phrasing only):

  • Seek medical help right away upon suspected overdose.
  • Call the local emergency number or contact a poison control center or emergency room at once.

Overdose Classifications (High-level)

Severity classification (as defined in official documents):

  • Mild Overdose: Generally does not cause serious problems, with symptoms like stomach pain and vomiting.
  • Severe/Large Overdose: Associated with life-threatening outcomes including seizures, coma, acute renal failure, and significant internal bleeding, and may cause death.

Regulatory basis (EMA / FDA / etc.):

  • This information is derived from official U.S. FDA Prescribing Information and the NIH/MedlinePlus Medical Encyclopedia.

Overdose-context constraints (as defined in official documents):

  • Symptoms depend on the amount swallowed and how quickly treatment is received.
  • The patient should be followed for several days, as gastrointestinal ulceration and hemorrhage have been reported.

Resulting Overdose Structure

Official overdose statements:

  • Overdose may present with CNS manifestations including intense headache, dizziness, and mental confusion, or severe outcomes such as seizures and coma.
  • Serious, life-threatening outcomes include acute renal failure and major gastrointestinal hemorrhage or perforation, which may require advanced support.
  • Treatment is symptomatic and supportive; the official labeling confirms that no specific antidote is available to reverse the drug's effects.
  • Regulators mandate that immediate medical help must be sought when an overdose is suspected, with follow-up monitoring of vital signs and diagnostic tests (e.g., ECG, blood tests) often required.

Connection to the overall overdose profile (2–4 sentences): Official regulatory documents strictly define the Indometacin overdose profile by listing specific symptoms across multiple organ systems, emphasizing the potential for severe outcomes like acute renal failure and major GI complications. The profile mandates that urgent medical attention must be sought immediately following a suspected overdose due to the absence of a specific antidote and the need for immediate, standardized supportive treatment and continuous hospital monitoring. This structure is intended solely to describe clinical manifestations and regulator-required emergency procedures, without offering any clinical advice or interpretation.

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Therapeutic Uses of Antalgin (Indometacin)

What Antalgin (Indometacin) Treats: Main Uses and Benefits

Antalgin is commonly applied in the long-term management of conditions characterized by persistent joint inflammation and stiffness, such as Rheumatoid Arthritis (RA), Ankylosing Spondylitis (AS), and Osteoarthritis (OA). The medication is used for managing symptoms associated with these moderate to severe conditions. Beyond chronic care, it is applied in addressing acute or disruptive episodes, including Acute Gouty Arthritis, the localized inflammation of bursitis and tendinitis, and in specialized cases for certain Indometacin-responsive headache disorders. Applied during phases of heightened discomfort, the medication helps address groups of symptoms that create noticeable interference with daily stability.

The primary therapeutic benefit contributes to easing the patient's symptomatic burden. It helps maintain a sense of stability when symptoms become more noticeable and contributes to improved day-to-day comfort. Furthermore, in a critical, specialized neonatal setting, it is applied in addressing conditions linked to temporary physiological imbalance, specifically in premature infants.


Quick Fact: Relief for Inflammation and Pain
This medication is primarily relevant for easing symptoms that create noticeable physiological strain, specifically inflammation, swelling, acute pain, and severe morning stiffness, supporting patients during difficult episodes.

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Eligibility and Restrictions for Use

This section summarizes the official eligibility and non-eligibility rules for Antalgin (Indometacin), as defined by governmental regulatory agencies.

Eligibility and Non-Eligibility Status

Status Population/Condition
Contraindicated Known hypersensitivity to indometacin, or history of asthma, urticaria, or allergic-type reactions after taking aspirin or other NSAIDs.
Contraindicated For the treatment of pain in the setting of coronary artery bypass graft (CABG) surgery.
Contraindicated Starting at 30 weeks gestation (third trimester) of pregnancy, due to risk of fetal harm.
Contraindicated Active gastrointestinal (GI) bleeding, ulceration, or perforation.
Not Recommended Patients with severe heart failure, advanced renal disease, or who are trying to conceive.
Restricted Use Between approximately 20 and 30 weeks gestation in pregnancy, to be limited to the lowest effective dose for the shortest duration possible.

Age-Related Eligibility: Safety and efficacy have not been established for children younger than 14 years of age for oral and rectal formulations. Elderly patients may be at a higher risk for certain adverse reactions and should be monitored with caution. The drug is contraindicated in several specific populations; therefore, individuals with a history of any listed contraindications must not use the medicine, as officially defined in regulatory documentation.

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What should I know about interactions with other medicines?

Interactions with other medicines and products

Official regulatory information classifies Indometacin interactions into pharmacodynamic and exposure-modifying categories, necessitating specific restrictions and monitoring requirements.


Interaction-Related Restrictions

Restriction Type Interacting Agents / Conditions
Contraindicated Treatment of peri-operative pain in the setting of Coronary Artery Bypass Graft (CABG) surgery; co-administration with Triamterene is restricted.
Not Generally Recommended Concomitant use with Aspirin (analgesic doses) or other NSAIDs due to increased risk of adverse events without proven therapeutic gain.
Substance Restriction Consumption of Alcohol significantly increases the risk of serious gastrointestinal bleeding.

Clinically Significant Interactions

Indometacin can reduce the effectiveness of several medication classes. It may diminish the antihypertensive effect of ACE Inhibitors, Angiotensin Receptor Blockers (ARBs), and Beta-Blockers, and may reduce the natriuretic effect of Diuretics.

Exposure modification is documented with certain narrow therapeutic index drugs: Indometacin may increase the serum concentrations of Digoxin, Lithium, and Methotrexate, requiring close monitoring. Co-administration with drugs that interfere with hemostasis (e.g., Warfarin, Antiplatelet agents, SSRIs/SNRIs) increases the risk of serious bleeding events due to additive pharmacodynamic effects.

Population-Specific Notes: Concomitant use with ACE Inhibitors or ARBs in the elderly, volume depleted, or those with renal impairment may result in a deterioration of renal function, as stated in regulatory labels.

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Mechanism of Action

Modulating Prostanoid Signals and Pain Sensitization

The primary mechanism of action involves the drug operating as a non-selective competitive inhibitor of the Cyclooxygenase (COX) enzymes (COX-1 and COX-2). Inhibiting the COX pathway suppresses the production of prostaglandins, which are signaling molecules that modulate the sensitivity threshold of peripheral pain receptors, resulting in a reduction of afferent pain signaling.

Modulation of Hypothalamic Thermoregulatory Signaling

The drug's activity affects the central nervous system, specifically the hypothalamus. By inhibiting prostaglandin synthesis in this brain region, Indometacin directly modulates the body's thermoregulatory set point, influencing the body's mechanism for temperature control and leading to a mechanistic reduction in elevated core temperature.

Influencing Local Cellular Response

An additional component of the mechanism involves the modulation of specific cellular processes associated with inflammation. The drug helps stabilize lysosomes and modulate the movement of leukocytes (immune cells) into damaged tissue. These actions modulate the extravasation of leukocytes and reduce the release of lytic enzymes, contributing to an adjustment in the characteristic physiological changes associated with local tissue response.

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Dosage and Administration Information

Routes of Administration and General Principle

Indometacin is available for administration via the oral route (capsules, suspension), rectally (suppositories), and intravenously (for highly specialized neonatal use). The fundamental guiding principle across all uses is to employ the lowest effective dosage for the shortest duration necessary, with the dosing always adjusted to the patient’s individual response. Oral, immediate-release forms are typically administered with food or immediately after a meal.


Standard Adult Dosing and Duration

For chronic conditions such as rheumatoid arthritis, the initial oral immediate-release dose is typically 25 mg, administered two or three times daily. If needed, the daily dosage can be increased by 25 mg or 50 mg at weekly intervals, up to a total maximum dose of 200 mg per day. A single dose of up to 100 mg may be administered at bedtime to help manage severe night pain or morning stiffness. For acute episodes, such as bursitis or tendinitis, the course of therapy is typically short, often lasting 7 to 14 days, and is discontinued once symptoms are controlled.


Specialized Use and Procedural Requirements

The intravenous form is strictly limited to use in premature infants for a specific physiological condition. This regimen involves a short course of three weight-adjusted doses (e.g., 0.2 mg/kg) given 12 to 24 hours apart. This IV formulation requires prior reconstitution of the lyophilized powder. Extended-release capsules must be swallowed whole and must not be crushed, broken, or chewed. Older adults are advised to proceed with greater caution due to increased sensitivity to the medication.

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Recent Clinical Evidence

Evidence for the Use of Antalgin (Indometacin) in Pain and Inflammation Conditions

Research has examined Antalgin (Indometacin) was studied for conditions associated with acute or disruptive episodes where outcomes related to physical discomfort and functional limitations are common, such as rheumatoid arthritis, osteoarthritis, and ankylosing spondylitis. Studies exploring these conditions often focus on how outcomes reflecting daily functioning or activity level change over time.

Research in this area often involves clinical trials. These studies describe patterns observed in the short-to-medium term. For chronic inflammatory conditions, research explored outcomes linked to inflammatory or irritative states. The findings describe group patterns, not personal outcomes, suggesting that the studies describe patterns related to symptom outcomes in many of the populations evaluated in these trials.


Evidence for Antalgin (Indometacin) in Acute Joint and Soft Tissue Swelling

Antalgin (Indometacin) was evaluated in research exploring conditions characterized by fluctuating or episodic manifestations, particularly acute gouty arthritis and inflammation of the shoulder (e.g., bursitis and tendinitis). These studies often focus on outcomes describing episodic or acute changes in a short time frame. Research describes the time intervals over which study outcomes were measured.


Evidence in Specific Patient Populations and Uncertainty

Studies have explored how Antalgin (Indometacin) is measured in different patient groups, such as older adults. Research examined the use of the medicine in older adults and populations with certain pre-existing health issues. The findings were mixed or sometimes limited regarding how these specific groups experienced changes in outcomes related to physical discomfort compared to younger, healthier adults.

Specifically, the certainty remains low for many of the long-term outcomes due to follow-up durations being limited across many of the relevant studies. Data for certain groups, such as children or pregnant women, remain insufficient, meaning subgroup findings are uncertain. The overall body of evidence contributes to the broader evidence landscape, but it clearly indicates that research is ongoing to better understand the medication's full profile.

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Frequently Asked Questions (FAQ)

Common questions about Antalgin (Indometacin) (FAQ)

Q: What is Antalgin (Indometacin) mainly prescribed to treat?

A: According to official product information, Indometacin is indicated for treating specific types of moderate to severe conditions. This includes chronic conditions like rheumatoid arthritis, ankylosing spondylitis, and osteoarthritis. It is also used for acute episodes such as gouty arthritis and painful shoulder conditions like bursitis or tendinitis.

Q: Is Antalgin the same drug as the brand name Indocin?

A: Yes, Indometacin is the official generic name for the active substance. Indocin is one of the brand names under which this drug is marketed, although other brand names may exist globally.

Q: Is Antalgin available in any over-the-counter strengths?

A: No. Official labeling indicates that Indometacin is a potent nonsteroidal anti-inflammatory drug (NSAID) and is available only with a prescription.

Q: Can Antalgin (Indometacin) affect mood or cause confusion or mental changes?

A: Official information documents that Central Nervous System (CNS) effects are possible. These reported effects can include symptoms such as dizziness, somnolence (drowsiness), depression, anxiety, and mental confusion.

Q: Are there any known vision or hearing side effects associated with Antalgin use?

A: Yes, the official safety profile includes warnings about potential effects on the special senses. Reported side effects can include changes in vision, such as blurred vision, corneal deposits, and retinal disturbances. Hearing disturbances, including deafness, have also been documented.

Q: Can Antalgin (Indometacin) be taken at the same time as Tylenol (Acetaminophen)?

A: Information regarding co-administration with Acetaminophen is not specifically detailed in the official prescribing information for Indometacin. Regulatory guidance, however, generally advises caution when combining medications.

Q: Why do doctors sometimes prescribe another medication to protect the stomach while taking Antalgin long-term?

A: This practice is related to the established class warning for all NSAIDs, including Indometacin. The drug carries a documented risk of serious gastrointestinal (GI) adverse events, such as bleeding, ulceration, and perforation, which can occur with or without warning symptoms. The co-prescribed medication is intended to help reduce the potential for these effects.

Q: What are the signs of a serious allergic reaction to Antalgin that require urgent attention?

A: If symptoms of a severe hypersensitivity reaction (allergic reaction) occur, immediate medical evaluation may be required. These signs may include difficulty breathing, swelling of the face or throat, or a severe, blistering skin rash.

Q: Does Antalgin (Indometacin) affect kidney function over time?

A: Yes. Official warnings indicate that Indometacin can cause renal toxicity (kidney damage). This can manifest as new onset or worsening of existing renal impairment and may lead to conditions such as acute renal failure.

Q: Is it true that Antalgin may cause or worsen high blood pressure?

A: Yes, official labeling includes a warning about hypertension (high blood pressure). Indometacin has the potential to lead to the new onset of high blood pressure or to worsen blood pressure control in people who already have the condition.

Q: Are there restrictions on who can use Antalgin based on history of kidney or liver disease?

A: Yes. The drug is used with caution in individuals with a history of liver or kidney disease. Use is specifically restricted in patients with severe, uncontrolled renal impairment (kidney function problems).

Q: Are there special considerations for people with asthma before using Antalgin?

A: Yes. Official warnings advise that Indometacin should be avoided in patients with aspirin-sensitive asthma due to the risk of bronchospasm. It is also advised to use caution in people with pre-existing asthma that is not aspirin-sensitive.

Q: Why is Antalgin generally avoided during the later stages of pregnancy?

A: Official warnings state that Indometacin is generally contraindicated from 30 weeks gestation onward. This restriction is due to the potential for the drug to cause premature closure of the fetal ductus arteriosus, a condition associated with adverse outcomes for the fetus.

Q: Can women who are breastfeeding safely take Antalgin (Indometacin)?

A: Regulatory documents confirm that Indometacin is present in breast milk. Because Indometacin is present in breast milk, its use during breastfeeding involves an evaluation of potential risks and benefits by a healthcare provider.

Q: Is Antalgin (Indometacin) linked to fertility problems in women?

A: Yes. Official warnings for this class of medication state that NSAID use, including Indometacin, may impair female fertility. This effect is generally considered reversible once the medication is stopped.

Q: Can patients with a history of epilepsy or Parkinson's disease use Antalgin?

A: Official labeling advises that Indometacin should be used with caution in patients with a history of epilepsy or Parkinsonism (symptoms associated with Parkinson's disease). This is due to the documentation that the drug could potentially aggravate or worsen symptoms of these pre-existing conditions.

Q: Is Antalgin appropriate for use in children under the age of 14?

A: For pediatric patients younger than 14 years of age (excluding specialized neonatal use), appropriate use and dosage information are obtained through a healthcare provider. Standard prescribing information does not generally describe routine non-neonatal pediatric use.

Q: How quickly does Antalgin (Indometacin) typically start to relieve pain?

A: Patient information indicates that for chronic conditions like arthritis, initial relief may be observed within one week of starting treatment. However, the maximum anti-inflammatory effect may take several weeks to fully develop.

Q: How long does the pain relief effect of one dose of Antalgin usually last?

A: Clinical data indicates the drug has a biological half-life of approximately 5 to 10 hours. This time frame is generally consistent with the frequency intervals described in standard dosing regimens.

Q: Is there clinical data on the effectiveness of Antalgin compared to a placebo?

A: Yes. The drug’s efficacy for its approved indications is established through controlled clinical trials. These studies are designed to establish effectiveness by comparing the drug's effects to control groups, which typically include a placebo.

Q: What are the different dosage forms of Antalgin (e.g., capsule, suppository) and do they have different side effects?

A: The drug is manufactured in different forms, including oral capsules, suspensions, and rectal suppositories. While general side effects apply, different forms have distinct absorption rates and may therefore cause different local side effects (e.g., rectal irritation from a suppository).

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How should Antalgin (Indometacin) be stored and disposed of?

Official Storage and Disposal Requirements for Indometacin

Storage conditions for Indometacin are form-specific and must be strictly followed to ensure product stability.


Storage Requirements

Dosage Form Required Temperature Range
Oral Capsules Controlled Room Temperature: 20 C to 25 C (68 F to 77 F)
Oral Suspension Store below 30 C (86 F). Do not freeze.
Rectal Suppositories Often require refrigeration (2 C to 8 C), though some labels allow storage below 30 C.

General Handling and Disposal

All forms must be kept out of the sight and reach of children. The medicine should be stored in its tightly closed, original container and protected from moisture and light. Dispose of unused or expired Indometacin according to the instructions from your pharmacist or healthcare professional, adhering to local and national waste regulations.

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

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