Indomecin

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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.

Overview of Indomecin

Property Description
Active Ingredient Indometacin (or Indomethacin)
Pharmacological Class Nonsteroidal Anti-inflammatory Drug (NSAID)
Origin Synthetic compound (indole acetic acid derivative)
Forms Various: Oral (capsules), rectal (suppositories), topical
General Purpose Relieves inflammation, pain, and fever

What Type of Medicine is Indomecin (Indometacin)?

Indomecin is a synthetic medicinal product containing the active substance Indometacin, which is officially classified as a Nonsteroidal Anti-inflammatory Drug (NSAID). The active substance, Indometacin (or Indomethacin), is chemically characterized as an indole acetic acid derivative, confirming its origin as a synthetic compound. This classification places it within the family of agents used to manage inflammation, pain, and fever without relying on steroid hormones. Its potent action is clinically recognized for effectively targeting the underlying causes of inflammatory discomfort.


Composition and Forms of Indomecin

The core of Indomecin is the single-ingredient product Indometacin. This active substance is combined with appropriate pharmaceutical excipients (non-active ingredients) to create the final medicinal product. A key feature of Indometacin is its diverse availability across different dosage forms, including oral forms like capsules and rectal forms such as suppositories, ensuring the drug can be used systemically through various routes of administration. This flexibility also includes preparations for local application (topical use).


What is the General Purpose of Indomecin?

The primary function of Indomecin is to provide comprehensive relief by simultaneously addressing the three key symptoms associated with the body’s inflammatory reaction: inflammation, pain, and fever. It is therefore classified as an anti-inflammatory, analgesic, and antipyretic agent. Indomecin is typically used in scenarios where significant anti-inflammatory power is required. By directly influencing the underlying biological process (inhibiting prostaglandins), the medicine helps lessen swelling and tenderness and provides reliable relief from generalized aches and body pains.

Regulatory References

  1. WHO Model List of Essential Medicines
  2. Indomethacin Drug Information

What side effects are possible with Indomecin?

Possible Side Effects and Safety Information

Indomecin carries regulatory warnings regarding its potential for serious adverse events. It is classified with a Boxed Warning concerning two major risks: serious Cardiovascular Thrombotic Events (e.g., heart attack, stroke), which can be fatal and may occur early in treatment, and serious Gastrointestinal Adverse Events (e.g., bleeding, ulceration, perforation of the stomach or intestines), which can also be fatal and occur without warning symptoms. The risk for both types of serious events may increase with the duration of use.

Safety-Related Restrictions and Contraindications

Indomecin is contraindicated (should not be used) in patients undergoing Coronary Artery Bypass Graft (CABG) surgery. It is also contraindicated in patients with a history of asthma, hives, or other allergic reactions after taking aspirin or other Nonsteroidal Anti-inflammatory Drugs (NSAIDs). Use in pregnant women is limited, with avoidance recommended at 30 weeks gestation and later due to risks to the fetus.

Adverse Reaction Scope

Adverse reactions span multiple system-organ classes. The most common reactions (with an incidence of ge 3% in clinical studies) include headache, dizziness, dyspepsia, and nausea. Other serious risks include new-onset or worsening hypertension, renal toxicity, hepatotoxicity, heart failure, and severe skin reactions (e.g., SJS, DRESS). Elderly patients are at greater risk for serious adverse events, particularly serious GI events, and require careful monitoring.

Overdose and Emergency Response

Overdose Manifestations and Severe Outcomes

Indomecin overdosage is officially documented to cause a variety of systemic manifestations, primarily involving the Central Nervous System (CNS) and the Gastrointestinal (GI) tract. Documented symptoms include severe headache, unusual drowsiness, confusion, and dizziness, alongside GI distress such as nausea, abdominal pain, and vomiting, which may potentially contain blood. Sensory effects like tinnitus and blurred vision are also documented presentations.

Overdosage with a large amount is classified as potentially very harmful and carries the risk of severe, life-threatening outcomes. These complications may involve seizures, coma, and acute kidney injury leading to little or no urine output. Serious internal bleeding in the stomach and intestines is a documented risk, along with potential changes to the cardiovascular system, including high or low blood pressure and alterations in heart rate.

Regulator-Mandated Emergency Actions

Regulatory guidance mandates that individuals must seek medical help right away and contact a poison control center or emergency services for any suspected overdosage. Management is strictly symptomatic and supportive, as no specific antidote is officially documented. Procedures listed in regulatory documents include monitoring of vital signs (pulse, breathing, blood pressure), administration of activated charcoal, and, in severe cases, gastric lavage and breathing support. Diagnostic tests such as ECG and endoscopy may be required to assess the extent of systemic damage.

Therapeutic Uses of Indomecin

Addressing Acute Symptom Burdens and Episodic Strain

Indomecin is used in situations involving certain distressing symptoms, applied across domains where additional symptomatic support is needed. This medication is relevant in contexts marked by increased discomfort or tension, and is commonly used across conditions presenting with acute episodes. It helps address symptom clusters that may become intense or disruptive, such as symptoms related to physical discomfort, and is relevant in clinical settings that involve acute or unstable symptom patterns. This medicine is used for managing various manifestations, including those associated with recurrent arthritis, ankylosing spondylitis, and acute painful shoulder episodes. It supports the patient during difficult episodes by easing distress and assisting with maintaining functional stability when symptoms create noticeable physiological strain.


“It is applicable in scenarios where additional management of discomfort is required to help patients cope more steadily with symptom fluctuations.”

Quick Fact: Relief for Symptoms that Interfere with Daily Functioning.


This drug is commonly used when symptoms intensify and supportive relief is needed, particularly in situations involving recurrent or episodic manifestations. It contributes to improved comfort during periods of heightened symptoms, supporting general well-being during symptomatic phases.

Regulatory References

  1. Official FDA Drug Label via DailyMed

Eligibility and Restrictions for Use

Who Can and Cannot Use Indomecin?

Eligibility for Indomecin (Indometacin) is strictly defined by regulatory status, pre-existing conditions, and age. The medicine is contraindicated and must not be used by patients with a known hypersensitivity to Indometacin or other NSAIDs (including aspirin-sensitive asthma). Absolute prohibitions also apply to patients with active peptic ulceration or GI bleeding, those recovering from Coronary Artery Bypass Graft (CABG) surgery, and women in the third trimester of pregnancy.

Use is restricted or requires caution in several populations. Patients with severe renal impairment or uncontrolled heart failure are generally ineligible unless risks are carefully managed. Older adults require greater care and monitoring due to increased risk. For children under 14 years of age, the safety and efficacy of oral and rectal forms are typically not established for standard indications. Furthermore, use is not recommended during lactation or for women attempting to conceive.

What should I know about interactions with other medicines?

Interactions with other medicines and products

This section addresses formally documented interaction patterns for Indomecin found in government regulatory prescribing information.

Officially Contraindicated Combinations

Co-administration with other Nonsteroidal Anti-inflammatory Drugs (NSAIDs), including Aspirin, is prohibited due to the significant and additive risk of severe gastrointestinal toxicity. Use is also contraindicated for managing peri-operative pain in the setting of Coronary Artery Bypass Graft (CABG) surgery.


Pharmacokinetic and Exposure Effects

Indomecin alters the clearance of several co-administered medicines. The drug reduces the renal clearance of both Lithium and Methotrexate, resulting in increased plasma concentrations and potential toxicity for these substances. Conversely, Probenecid reduces the clearance of Indomecin itself, which increases Indomecin's systemic exposure. Co-administration may also lead to elevated plasma concentrations of Digoxin.


Pharmacodynamic and Substance Interactions

A clinically significant pharmacodynamic risk is the increased potential for serious bleeding/hemorrhage when Indomecin is combined with Anticoagulants (like Warfarin) or SSRIs. Furthermore, Indomecin diminishes the efficacy of antihypertensive agents such as ACE Inhibitors and Diuretics. The regulatory profile requires the avoidance of Alcohol due to an elevated risk of gastrointestinal hemorrhage. Interaction risk is heightened in elderly patients or those with renal impairment when combined with ACE Inhibitors.

Mechanism of Action

Indomethacin's primary mechanism of action is the non-selective inhibition of cyclooxygenase (COX) enzymes, specifically COX-1 and COX-2 isoforms. Indomethacin acts as a slow, tight-binding inhibitor at the active site of these enzymes.

These COX enzymes catalyze the conversion of arachidonic acid, a cell membrane-derived lipid, into prostaglandin H2 (PGH2). This step is rate-limiting in the biosynthesis of various downstream pro-inflammatory molecules, including prostaglandins and thromboxanes.

By inhibiting COX-1 and COX-2, Indomethacin restricts the cellular synthesis of these eicosanoids throughout the body. The resulting reduction in prostaglandin production leads to systemic modulation of inflammation pathways and decreased sensitization of peripheral nociceptors. The drug also exhibits additional, less-understood mechanisms, including inhibition of polymorphonuclear leukocyte motility and stabilization of lysosomal membranes, which modulates the release of hydrolytic enzymes into tissue.

Dosage and Administration Information

How Indomecin is Used: Official Administration Guidelines

Indomecin (Indometacin) is administered using the lowest effective dosage for the shortest duration possible. The medicine is officially available for oral, rectal, and intravenous (IV) administration, the latter reserved for specialized use in premature infants.

Dosing and Administration Protocols

Condition Type Starting Dose (IR Oral) Max Daily Dose Duration Pattern
Chronic (e.g., Arthritis) 25 mg two or three times daily 200 mg (IR) / 150 mg (ER) Increase dose at weekly intervals
Acute Gout 50 mg three times daily 150 mg Rapid reduction to cessation once pain is tolerable
Acute Shoulder 75 to 150 mg daily in 3 or 4 divided doses 150 mg Typical course of 7 to 14 days

Key Administration Instructions

  • Intake Context: Oral capsules and suspension should be taken with food, immediately after meals, or with antacids to support proper use.
  • Form Integrity: Extended-Release (SR) capsules must be swallowed whole; they must not be crushed, broken, or chewed. Oral suspension must be shaken well before measuring.
  • Rectal Use: Suppositories may be administered at bedtime for pronounced night pain or morning stiffness.
  • Population Rules: The medicine requires greater care in older adults, typically involving lower starting doses. The dose should be lowered for patients with known hepatic or renal impairment.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Indomecin

Evidence for Use in Chronic Inflammatory Conditions

The research base where Indomecin was evaluated in chronic inflammatory conditions like rheumatoid arthritis, ankylosing spondylitis, and osteoarthritis is built on numerous Randomized Controlled Trials (RCTs). These studies were used in research exploring how symptoms change over time in adults diagnosed with moderate to severe forms of these conditions. The studies monitored outcomes related to physical discomfort, such as joint tenderness and swelling, and outcomes reflecting daily functioning. Findings describe patterns observed in the studies where patient-reported outcomes describing perceived discomfort evolved during the measured period. However, the research provides limited insight into whether the drug affects the progressive course of the underlying chronic disease.

Evidence for Use in Acute Painful Episodes

Indomecin was studied for managing short-term, acute episodes, such as flares of gouty arthritis and acute painful shoulder syndromes. The relevant evidence primarily comes from short-term controlled clinical trials, applied in studies examining patient-reported experiences during phases of heightened symptom activity. These studies monitored outcomes describing episodic or acute changes, specifically assessing the time it takes for symptom intensity to evolve and changes in localized swelling. Research provides insight into short-term changes observed in the trial populations. However, this research is limited in scope; the studies were not designed to provide long-term data.

Evidence for Use in Specialized Prophylaxis and Neonatal Care

Indomecin was evaluated in highly specific, non-arthritis research scenarios. The rectal form was studied for PEP prophylaxis (against post-procedure pancreatitis) following a specialized endoscopic procedure (ERCP). The data show patterns related to incidence rates observed in multiple placebo-controlled trials. This evidence is derived from research exploring acute, post-procedural complications.

In another area, the intravenous formulation was studied for the rate of Patent Ductus Arteriosus (PDA) closure in pre-term infants. This research monitored the physical rate of vessel closure and outcomes related to systemic or functional imbalance, such as the incidence of severe brain hemorrhage (IVH). While the evidence describes rates of observed closure, long-term effects are not fully established. Research describing long-term neurodevelopmental outcomes in the studied infants suggests findings were mixed.

Key Studies & References

  1. INDOMETHACIN capsule - DailyMed (FDA Drug Label for oral forms)
  2. INDOMETHACIN injection, powder, lyophilized, for solution - DailyMed (FDA Drug Label for IV form)
  3. PRODUCT MONOGRAPH Indocid P.D.A. (indomethacin sodium for injection) LYOPHILIZED (Health Canada/Regulatory Monograph)
  4. Non-steroidal anti-inflammatory drugs and cardiovascular risks in the UK (EMA/Regulatory Review)

Frequently Asked Questions (FAQ)

Common questions about Indomecin (FAQ)


Q: How quickly does Indomecin typically start to work for pain?

Official information, primarily drawn from pharmacokinetic studies, describes how the medicine is processed by the body. These studies indicate that Indomecin has a mean plasma half-life of approximately 4.5 hours in adults, which is the time it takes for the concentration of the drug in the blood to decrease by half. While this does not state the exact time until a person feels pain relief, this data provides information used by prescribers to determine dosing frequency.


Q: What's the difference between Indomecin and Ibuprofen, generally speaking?

Both Indomecin and Ibuprofen are classified as Nonsteroidal Anti-inflammatory Drugs (NSAIDs), meaning they work similarly to reduce pain and inflammation. The medicines are different compounds: Indomecin is an indole acetic acid derivative, and Ibuprofen is a propionic acid derivative. Regulatory documents establish distinct indications, dosing, and specific warnings for each medicine.


Q: Is Indomecin safe for long-term use?

Official guidelines stress the importance of using Indomecin at the lowest possible dose for the shortest period required to achieve treatment goals. Regulatory warnings note that the risk of serious side effects, particularly those affecting the heart and the stomach (like bleeding and ulcers), may increase the longer the medicine is used. In cases of long-term use for chronic conditions, regulatory guidance highlights the need for ongoing patient monitoring.


Q: How does Indomecin compare to Naproxen in terms of how long it lasts?

According to regulatory data on how the drug is eliminated, Indomecin has a mean plasma half-life of approximately 4.5 hours in adults. For comparison, Naproxen is typically described as having a longer half-life, ranging from 12 to 17 hours. This difference in the presence of the active substance in the body is a factor prescribers consider when determining dosing frequency.


Q: What are some less common but serious side effects of Indomecin?

Beyond the most frequently reported issues, regulatory documents have noted that other serious adverse events can occur in less than 1% of patients. These can include effects on the nervous system, such as depression, psychotic episodes, and blurred vision, as well as problems with hearing, and rare effects on the blood, such as severe anemia.


Q: Is Indomecin available in different formulations (e.g., capsule, liquid)?

Yes, Indomecin is officially available in multiple physical forms. This includes immediate-release and extended-release oral capsules, a liquid oral suspension, and suppositories for rectal administration. There is also an intravenous form, though it is approved only for a specific use in premature infants.


Q: Can Indomecin be taken on an empty stomach?

Official instructions advise that Indomecin is generally taken with food, milk, or an antacid immediately after meals. This specific guidance is provided to help reduce or mitigate the potential for gastrointestinal irritation and stomach upset that can be associated with the medicine.


Q: What should I do if I forget to take a scheduled dose of Indomecin?

General regulatory guidance for missed doses suggests taking the dose if remembered soon after the scheduled time, unless it is close to the next dose. If it is close to the next scheduled dose, the prior dose is typically skipped, and the regular schedule is resumed. Official guidance emphasizes that doses should not be doubled.


Q: Are there any common foods or drinks to avoid while taking Indomecin?

Regulatory guidance explicitly recommends avoiding alcohol while taking Indomecin. This restriction is due to the potential for a significantly increased risk of gastrointestinal bleeding when combined with alcohol.


Q: Are there different strengths of Indomecin available?

Yes, official product information confirms Indomecin is manufactured in different strengths to allow for flexibility in its use. For example, immediate-release oral capsules are commonly available in strengths of 25 mg and 50 mg, and other strengths are available for the extended-release and suppository forms.


Q: Does Indomecin affect sleep?

Regulatory documents list certain central nervous system (CNS) effects that could potentially interfere with sleep. Reported adverse reactions in this area include insomnia, listlessness, and depression. Patients are generally informed to note these potential effects.


Q: Is Indomecin commonly associated with headaches?

Yes, headache is noted in regulatory documents as one of the most common side effects observed during clinical studies. It was reported with an incidence rate of 3% or higher among patients using the drug.


Q: Is Indomecin a narcotic or addictive?

Indomecin is classified as a Nonsteroidal Anti-inflammatory Drug (NSAID) and works by modulating inflammation. It is not listed as a controlled substance by the Drug Enforcement Administration (DEA) and is not classified as a narcotic.


Q: Can I take Indomecin if I am also taking an antidepressant?

Regulatory warnings indicate a specific interaction risk with a class of antidepressants called Selective Serotonin Reuptake Inhibitors (SSRIs). Using Indomecin alongside an SSRI may increase the risk of serious bleeding events. Regulatory warnings note that a healthcare professional can assess the risk of this combination.


Q: Are there any limitations on driving or operating machinery while using Indomecin?

Official information includes possible side effects on the central nervous system, such as dizziness, vertigo, drowsiness, and confusion. Patients are generally advised to note how the medicine affects them before performing tasks that require mental alertness.


Q: How is Indomecin different from celecoxib?

The primary difference lies in their mechanism of action, as described in regulatory texts. Indomecin is characterized as a non-selective inhibitor of the cyclooxygenase (COX) enzymes, affecting both COX-1 and COX-2. Celecoxib, in contrast, is classified as a selective inhibitor, primarily targeting only the COX-2 enzyme.


Q: What is the maximum duration of use mentioned in official guidelines?

Official guidance emphasizes using the drug for the shortest possible duration consistent with treatment goals. For acute episodes, specific, short timeframes are often given, such as 7 to 14 days. For chronic use, a maximum daily dose is provided, but a singular maximum time limit for all chronic therapy is not typically stated; instead, careful, ongoing monitoring is required.


Q: Are generic versions of Indomecin as effective as the brand name?

The regulatory body (FDA) only approves a generic drug product after it has demonstrated therapeutic equivalence to the brand-name product. This means the generic version must contain the identical active ingredient, strength, and dosage form, and meet the same strict standards for quality and performance.


Q: Is Indomecin approved for use in children?

Official prescribing information states that the safety and effectiveness of the oral and rectal forms are generally not established for children 14 years of age and under. However, the intravenous formulation is officially indicated and approved for use in premature infants within a specific weight range for the treatment of Patent Ductus Arteriosus (PDA).


Q: What is the meaning of 'Indomecin' in the context of drug classification?

'Indomecin' is the brand or trade name under which the medicine is sold. The active ingredient itself is called Indometacin (or Indomethacin), which is officially classified as a Nonsteroidal Anti-inflammatory Drug (NSAID), specifically derived from indole acetic acid.


Q: What kind of studies have been performed on Indomecin's long-term safety?

Regulatory warnings mention that clinical trials involving this class of NSAID, lasting up to three years, have been used to evaluate the risk of serious cardiovascular events. Safety information is also compiled from postmarketing surveillance data, as well as specific studies related to its approved use in premature infants.


Q: Can Indomecin cause problems with hearing?

Yes, regulatory documents list adverse reactions related to the special senses. These reports include possible hearing impairment and, in rare instances, cases of deafness.


Q: What is the official recommended action if a side effect is noticed?

Official communications advise contacting a healthcare professional immediately if a patient experiences any serious adverse reactions, such as symptoms of heart issues or internal bleeding (e.g., chest pain, difficulty breathing, or slurring of speech). For non-urgent effects, patients are advised to discuss them with their provider.


Q: Does the effectiveness of Indomecin depend on the patient's weight?

For the oral and rectal forms used by adults, dosing is primarily guided by the patient's condition, response to treatment, and tolerability, rather than being strictly weight-based. However, for the specific intravenous use in premature infants, regulatory dosing is calculated precisely based on the infant’s weight and age.

How should Indomecin be stored and disposed of?

Storage and Disposal Requirements for Indomethacin

Indomethacin must be stored according to official regulatory specifications to maintain its stability. Capsules and oral suspension require storage at controlled room temperature, specifically between 20 C and 25 C (68 F and 77 F). Suppositories must be kept refrigerated, between 2 C and 8 C (36 F and 46 F). All forms must be kept in the original container, tightly closed, and protected from moisture. The oral suspension should not be frozen.

Child Safety and Disposal

All Indomethacin forms must be stored out of the reach and sight of children. To dispose of unused or expired medicine, use a medicine take-back program. If a program is unavailable, mix the product with an undesirable substance, seal it, and place it in the household trash. Do not flush Indomethacin down the toilet or pour it down a drain.

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

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