Indometacin Sintofarm

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Overview of Indometacin Sintofarm

Indometacin Sintofarm is a prescription-only (Rx) medication used for the symptomatic relief of moderate to severe pain, inflammation, and stiffness. Its active ingredient is indometacin, a potent compound classified as a Non-Steroidal Anti-Inflammatory Drug (NSAID). The “Sintofarm” designation refers to the specific formulation manufactured by Sintofarm S.A., which is commonly distributed as 50 mg suppositories in certain regions, notably Romania and parts of Eastern Europe.


Quick Facts

Property Description
Active Ingredient Indometacin
Form (Common) 50 mg Rectal Suppositories
Pharmacological Class Non-Steroidal Anti-Inflammatory Drug (NSAID)
Primary Use Relief of pain and inflammation in severe arthritis and acute soft-tissue injuries.

Overview and Key Applications

Indometacin is recognized pharmacologically as an acetic acid derivative, an early and effective type of NSAID that is generally reserved for conditions when lower-potency NSAIDs are insufficient. It is used for several painful inflammatory conditions, recognized for its rapid onset of action and strong anti-inflammatory effects.

This medicine is primarily utilized for the symptomatic relief of severe inflammatory disorders, including:

  • Rheumatoid arthritis
  • Ankylosing spondylitis
  • Acute flares of gouty arthritis

Its clinical effectiveness in treating such diseases is well-established. Indometacin is recognized as a highly effective agent in managing chronic inflammatory joint diseases. This medicine does not cure the underlying condition but significantly improves the patient’s function by inhibiting the inflammatory process. Due to its potency, Indometacin Sintofarm is used under strict medical supervision.

Regulatory References

  1. EMA Medicines List
  2. Indometacin Product Information (eMC/MHRA)
  3. About NIH/NLM
  4. Indomethacin - NIH/StatPearls
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What side effects are possible with Indometacin Sintofarm?

Indometacin is a non-steroidal anti-inflammatory drug (NSAID) and is associated with known risks. To minimize potential adverse effects, the lowest effective dose should be used for the shortest possible duration.

Serious Warnings

  • Cardiovascular Risk: Indometacin may increase the risk of serious, and potentially fatal, cardiovascular thrombotic events, such as heart attack or stroke. This risk may be higher with longer duration of use and in individuals with pre-existing heart disease or risk factors. It is contraindicated for pain treatment right before or after coronary artery bypass graft (CABG) surgery.
  • Gastrointestinal Risk: NSAIDs can cause serious gastrointestinal adverse events, including inflammation, bleeding, ulceration, and perforation of the stomach or intestines, which can be fatal. These can occur without warning symptoms, particularly in older adults. Signs of serious GI issues include bloody or black, tarry stools, and vomiting blood or material that looks like coffee grounds.

Common Side Effects

Commonly reported side effects (incidence 3%) often involve the central nervous system and the gastrointestinal tract:

System Common Side Effects
Central Nervous System Headache, dizziness, drowsiness
Gastrointestinal Nausea (with or without vomiting), indigestion (dyspepsia), heartburn, abdominal pain, diarrhea, constipation

If you experience severe headache, persistent dizziness, or any serious adverse reaction, consult your healthcare provider immediately. Individuals with asthma (especially aspirin-sensitive asthma), existing kidney or liver problems, high blood pressure, or a history of bleeding disorders should use Indometacin with caution and only under medical supervision. Indometacin may also cause fluid retention and should be used cautiously in patients with heart failure.

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Overdose and Emergency Response

Overdose and when to seek help

An overdose of Indometacin Sintofarm requires immediate medical attention. If an overdose is suspected, individuals must seek medical help right away and contact emergency services or a Poison Control Center, as mandated by regulatory authorities.

The clinical signs of an acute overdose are primarily linked to the Central Nervous System (CNS) and the Gastrointestinal (GI) tract. Documented CNS manifestations include severe headache, dizziness, confusion, and extreme tiredness. GI symptoms often involve nausea, vomiting (which may contain blood), stomach pain, and diarrhea. Other signs may include blurred vision, tinnitus, changes in heart rate, or blood pressure fluctuations.

Severe and life-threatening outcomes are documented in regulatory prescribing information. These may include the development of seizures or coma, severe internal bleeding, and potential permanent kidney damage. A large overdose poses a serious risk to both children and adults.

Management for an Indometacin overdose is strictly symptomatic and supportive, as no specific antidote is known. Officially described supportive measures may include hospital procedures such as gastric lavage, administration of activated charcoal, continuous monitoring of vital signs and ECG, and necessary blood and urine testing. These procedures are required to manage and mitigate acute complications.

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Therapeutic Uses of Indometacin Sintofarm

What Indometacin Sintofarm Treats: Main Uses and Benefits

This medication is applied for the symptomatic management of severe, chronic inflammatory conditions, particularly rheumatoid arthritis and ankylosing spondylitis, as well as pronounced osteoarthritis. Indometacin is commonly used to help address symptoms related to physical discomfort, swelling, and stiffness in the context of these conditions. It is relevant when symptoms related to pain and morning stiffness are intense, providing support that helps ease the overall symptom burden during symptomatic phases.

Indometacin Sintofarm is primarily relevant during acute flares of gouty arthritis, where symptoms of intense, sudden pain and overwhelming joint swelling occur. It is considered relevant when supportive symptom management is appropriate for these distressing symptomatic manifestations and may assist with managing symptoms associated with acute or episodic changes.

The drug may be part of symptomatic management applied across domains where additional symptomatic support is needed for conditions involving localized swelling in soft tissues, such as bursitis and tendinitis (acute painful shoulder), as well as general post-traumatic or post-operative pain and swelling. It is applied in these contexts where symptoms create noticeable interference with movement, may assist with maintaining a sense of stability when symptoms are more noticeable, and contributes to improved comfort during periods of heightened symptoms.

“It supports general well-being during symptomatic phases.”

Quick Fact: Relief for Swelling and Stiffness
Primary Domain Severe Chronic Arthritis, Acute Gout
Symptom Focus Intense Pain, Joint Swelling, Morning Stiffness
Patient Benefit Supports general well-being and improved comfort

Regulatory References

  1. NIH MedlinePlus Drug Information
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Eligibility and Restrictions for Use

Eligibility for Indometacin: Official Regulatory Status

Official prescribing information establishes specific criteria regarding which populations may or may not use Indometacin Sintofarm. Eligibility is defined by absolute prohibitions and by conditional restrictions related to patient health status and life stage.

Eligibility Status Defined Population Groups
Absolute Contraindications Patients with known hypersensitivity to indometacin, a history of aspirin-sensitive asthma or allergic reactions to other NSAIDs, active peptic ulceration or hemorrhage, or severe hepatic, renal, or heart failure. Use is also prohibited in the setting of coronary artery bypass graft (CABG) surgery.
Age-Group Restrictions The safety and effectiveness for rheumatologic indications are not established in children younger than 14 years of age. Older adults are permitted to use the medicine but require greater care and careful monitoring due to the increased possibility of adverse reactions.
Pregnancy and Lactation Use is contraindicated in women during the third trimester of pregnancy (beginning at 30 weeks gestation). Avoidance is typically recommended during breastfeeding due to the presence of indometacin in breast milk.
Conditional Use (Caution) Patients with uncontrolled hypertension, existing cardiovascular disease, or less severe renal or hepatic impairment should use the medicine with caution. For the suppository formulation, use is contraindicated in those with a history of proctitis or recent rectal bleeding.

This structure reflects the mandated eligibility constraints derived strictly from government-approved labeling.

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What should I know about interactions with other medicines?

Indometacin Sintofarm Interactions with other medicines and products

This section details officially documented interaction information for Indometacin, the active ingredient in Indometacin Sintofarm, as established in government regulatory prescribing information.


Contraindicated and High-Risk Combinations

Certain combinations are explicitly advised against or prohibited due to severe adverse event risk. Co-administration is generally not recommended with Ketorolac, Diflunisal, or Triamterene due to risks including fatal hemorrhage and acute renal failure. Concurrent use with other Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), including analgesic doses of Aspirin, is also not generally recommended because it increases the risk of gastrointestinal ulcers and bleeding.


Interactions Affecting Drug Levels

Indometacin may increase the plasma concentration of co-administered agents by reducing their clearance. This effect is significant with Lithium and Digoxin, requiring mandatory monitoring of serum levels to prevent toxicity. Similarly, Indometacin may decrease the tubular secretion of Methotrexate, thereby potentiating its exposure.


Pharmacodynamic and Efficacy-Altering Interactions

Interacting Agent/Category Official Consequence
Anticoagulants (e.g., Warfarin) Increased risk of bleeding and hemorrhage (requires monitoring of prothrombin time).
Antihypertensives (ACE Inhibitors, ARBs) May diminish the blood pressure-lowering effect.
Diuretics (Thiazides, Furosemide) May reduce the diuretic and antihypertensive effects.
SSRIs/SNRIs Associated with an increased risk of gastrointestinal bleeding.

Population-Specific Cautions

Regulatory warnings note that Elderly, Volume-Depleted, or Renal-Impaired Patients face a higher risk of deterioration of renal function when Indometacin is co-administered with ACE Inhibitors or ARBs.

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Mechanism of Action

Indometacin Sintofarm acts by targeting and modulating key enzyme systems involved in the synthesis of prostanoid mediators. The drug's mechanism is defined by three overlapping physiological domains that influence critical biological processes.

Non-Selective Inhibition of Cyclooxygenase (COX) Enzymes

This primary domain describes the molecular interaction where indometacin acts as a non-selective competitive inhibitor of both the COX-1 and COX-2 enzymes. By blocking these targets, the drug intercepts the conversion of arachidonic acid into pro-inflammatory and pronociceptive mediators, initiating a cascade that affects downstream physiological responses.

Modulation of the Prostaglandin Signaling Cascade

The inhibition of COX enzymes leads directly to a profound reduction in the synthesis of prostaglandins ( PGE2 and PGI2) in peripheral tissues and the central nervous system. This mechanistic domain is crucial because the resulting decrease in PGE2 specifically reduces the sensitization of sensory nociceptors, a modulation that impacts afferent pain signaling.

Central Thermoregulation and Local Inflammatory Dampening

Indometacin's mechanism supports dual action in different physiological locations. Inhibition of prostaglandin synthesis in the hypothalamus modulates the thermal set-point of the body, influencing core temperature regulation. Concurrently, the local reduction of prostaglandins at injury sites limits capillary permeability and cellular infiltration, resulting in the dampening of local inflammatory markers.

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Dosage and Administration Information

The administration of Indometacin Sintofarm is defined by the official instructions as strictly the rectal route, utilizing the 50 mg suppository formulation. This dosage form is not to be used orally or intravaginally. The suppository may require chilling under cold water or in a refrigerator if it is too soft to handle prior to insertion.

The overall dosage regimen is highly dependent on the condition being addressed. The total daily dose is typically administered in divided amounts, two to four times a day, and must not exceed 200 mg. For chronic conditions like rheumatoid arthritis, the dosage is generally initiated at a lower amount and adjusted incrementally, with increases made in 25 mg or 50 mg steps at weekly intervals.

For acute episodes such as gouty arthritis, a typical regimen involves 50 mg three times a day, with instructions to rapidly reduce and discontinue the dose once the acute symptoms are controlled. Therapy for acute painful shoulder is generally limited to a course of 7 to 14 days.

To manage specific symptoms like night pain or morning stiffness, up to 100 mg of the total daily dose may be administered at bedtime. Official guidance also specifies that the medicine must be used with greater care in the elderly population.

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Recent Clinical Evidence

Research evidence / Overview of studies for Indometacin Sintofarm

Evidence for use in Chronic Inflammatory Arthritis

Studies for Rheumatoid Arthritis (RA) and Ankylosing Spondylitis (AS) include numerous Randomized Controlled Trials (RCTs) and Meta-analyses involving adult patients with moderate to severe symptoms. Researchers monitored outcomes related to physical discomfort, such as joint swelling and tenderness, and functional measures like walking time. For Osteoarthritis (OA), research primarily explored short-term symptom changes, measuring outcomes related to pain intensity. Studies report measurements of symptomatic change across these chronic conditions, but comparative evidence is lacking against some of the newer therapeutic classes utilized in modern protocols.

Evidence for Acute Conditions and Special Populations

Research for acute gouty arthritis was structured as very short-term trials involving adult patients, focusing on the time required for definite pain relief and the descriptive resolution of acute localized symptoms. For localized bursitis and tendinitis, studies explored symptomatic outcomes over short treatment durations, typically one to two weeks. Studies monitored outcomes in older adults, where age-related factors may influence findings. Data for children and adolescents remain insufficient, as appropriate studies have not been performed in children under 14 years of age for many formulations.

Evidence Gaps and Extended Observation

Indometacin was observed in long-term observational settings evaluating daily-life functioning in patients with chronic RA and AS, monitoring patient-reported outcomes over extended time periods. However, certainty remains low regarding the comparative, long-term characteristics of Indometacin against specific current treatment options. Follow-up durations were limited in studies for acute conditions, providing minimal data on outcomes beyond the initial treatment phase. Data for certain specific patient groups or those with comorbid conditions also remain insufficient.

Key Studies & References Do Etoricoxib and Indometacin Have Similar Effects and Safety for Gouty Arthritis? A Meta-Analysis of Randomized Controlled Trials

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Frequently Asked Questions (FAQ)

Common questions about Indometacin Sintofarm (FAQ)


Q: Is Indometacin Sintofarm the same type of medicine as ibuprofen or naproxen?

Regulatory documents classify the active ingredient, indometacin, in the same general pharmacological category as ibuprofen and naproxen. They are all considered Non-Steroidal Anti-Inflammatory Drugs (NSAIDs). This classification is based on their shared action of reducing inflammation and pain.


Q: How quickly should I expect Indometacin Sintofarm to start working?

Official information indicates that a noticeable effect, particularly for acute issues, can occur relatively quickly. For chronic conditions such as arthritis, while initial pain relief may begin within one week, full therapeutic benefits may require several weeks, according to official prescribing information.


Q: How long does the effect of Indometacin Sintofarm typically last?

According to the official pharmacokinetics data, the mean half-life of indometacin in the body is estimated to be approximately 4.5 hours. This half-life is a measurement of the time it takes for half of the dose to leave the bloodstream, which informs the recommended dosing intervals.


Q: Is it normal to feel stomach discomfort when first taking Indometacin Sintofarm?

Official adverse event reports list gastrointestinal issues, such as nausea, indigestion, heartburn, and abdominal pain, as commonly reported side effects. These effects are generally recognized in official warnings as being among the possibilities when treatment with the medicine is initiated.


Q: Does Indometacin Sintofarm affect blood pressure or heart rate?

Regulatory warnings state that NSAIDs like indometacin can potentially lead to the new onset or worsening of high blood pressure (hypertension). Regulatory guidance notes that close monitoring of blood pressure may be required by a healthcare professional when starting this treatment and throughout the course of therapy.


Q: Are there any common foods or drinks that should be avoided while using Indometacin Sintofarm?

Official warnings state that the consumption of alcohol while using this medicine is advised against. This is because the combination significantly increases the risk of serious gastrointestinal adverse events, such as stomach bleeding, as noted in the regulatory documents.


Q: Is Indometacin Sintofarm generally appropriate for older adults?

Official prescribing information states that older adults are permitted to use the medicine. However, regulatory guidelines also specify that they require greater care and careful monitoring. This is due to the increased possibility of experiencing adverse reactions, such as serious gastrointestinal issues, noted in this population group.


Q: Does Indometacin Sintofarm interact with common supplements like multivitamins or fish oil?

Official regulatory documents do not specifically list interactions with common multivitamins or fish oil. However, they advise caution regarding all co-administered agents and supplements. Patients typically receive guidance to disclose the use of all supplements, including herbal remedies, to their healthcare provider.


Q: Can Indometacin Sintofarm be taken on an empty stomach?

Indometacin Sintofarm is typically a rectal suppository, not an oral medicine to be swallowed. For the oral forms of indometacin, official labeling often advises taking them with food, milk, or an antacid. This is a common regulatory suggestion intended to help reduce the possibility of stomach upset.


Q: Can Indometacin Sintofarm make you feel drowsy or affect your ability to drive?

Official labeling lists dizziness and drowsiness as common side effects of indometacin. For this reason, official warnings note a recognized potential for reduced alertness, which may affect tasks requiring concentration, such as operating machinery or driving.


Q: Can Indometacin Sintofarm cause changes in sleep patterns?

Official adverse event reports associated with the active ingredient indometacin list insomnia (inability to sleep) as a possible nervous system reaction. This indicates that changes in sleep patterns may occur during use.


Q: What should I do if I forget when I last took Indometacin Sintofarm?

General regulatory guidance for a missed dose outlines that the missed amount should be taken as soon as it is remembered, unless it is nearly time for the next scheduled amount. In that case, the missed amount is usually omitted. Official guidance states that taking two doses together is not advised.


Q: Is there a maximum amount of time Indometacin Sintofarm is usually prescribed for?

The recommended duration of therapy depends on the condition being addressed. For acute, short-term issues like painful shoulder, therapy is generally limited to one or two weeks. For chronic inflammatory conditions, it may be used long-term under strict medical supervision, with an emphasis on using the shortest effective duration.


Q: Do studies suggest a link between Indometacin Sintofarm and kidney function?

Official warnings acknowledge a risk of deterioration of renal (kidney) function associated with indometacin. This risk is specifically highlighted when the medicine is used alongside certain other drugs, such as ACE inhibitors, or in patients who already have existing kidney problems.


Q: What are the main warnings about taking Indometacin Sintofarm with alcohol?

Regulatory warnings indicate that consuming alcohol while using indometacin significantly increases the risk of serious gastrointestinal adverse events, including stomach bleeding, ulcers, or perforation. For this reason, the avoidance of alcohol is noted in the official guidance.


Q: Is Indometacin Sintofarm safe to take if I am already taking medicine for acid reflux?

There are no stated direct interactions between indometacin and most acid reflux medicines (such as proton pump inhibitors). However, since NSAIDs can cause serious gastrointestinal events, official labeling notes that anti-ulcer medications are sometimes co-prescribed for patients considered to be at high risk of developing ulcers.


Q: Does Indometacin Sintofarm have a different effect than other NSAIDs on fever?

Indometacin, like other NSAIDs, possesses antipyretic (fever-reducing) properties. The mechanism involves inhibiting prostaglandin synthesis in the part of the brain that controls body temperature. Regulatory documents do not contain comparative claims about its specific strength versus other NSAIDs.


Q: What happens if Indometacin Sintofarm is stopped suddenly?

Guidance on discontinuation suggests that stopping the medicine suddenly, particularly in patients being treated for chronic inflammatory conditions, may result in a rapid return of symptoms. A concern mentioned in official discontinuation guidance for anti-inflammatory drugs is the potential for loss of symptom control.


Q: Are there different forms of Indometacin Sintofarm, like capsules versus suppositories?

Indometacin Sintofarm is defined by its specific formulation, which is typically a 50 mg rectal suppository. However, the active ingredient, indometacin, is also available globally in other regulatory-approved forms, including oral capsules, extended-release capsules, and liquid suspension.


Q: Can Indometacin Sintofarm interact with herbal remedies, such as St. John's wort?

While St. John's wort is not specifically listed in the interactions section, general regulatory warnings advise caution with herbal remedies. Some herbal products may alter the body's processing of medications. Patients typically receive guidance to disclose the use of all supplements to a healthcare professional.


Q: Are there any common skin reactions associated with taking Indometacin Sintofarm?

Official adverse event reports acknowledge that skin reactions are possible side effects associated with the use of indometacin. Furthermore, photosensitivity, which is an increased sensitivity to light, is also listed as a potential effect in official documents.


Q: What is the difference in purpose between Indometacin Sintofarm and a standard muscle relaxant?

Indometacin Sintofarm is classified as an NSAID and works primarily by reducing inflammation and pain through the inhibition of prostaglandins. Standard muscle relaxants are a different class of medicine that act on the central nervous system to reduce muscle spasms, serving a different therapeutic purpose.


Q: Is it described in official sources that Indometacin Sintofarm can cause swelling in the feet or ankles?

Yes, official labeling states that non-steroidal anti-inflammatory drugs (NSAIDs) may cause fluid retention and edema, which is swelling that can occur in the feet and ankles. It is advised in official sources that patients with pre-existing fluid retention or heart failure use the medicine cautiously.

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How should Indometacin Sintofarm be stored and disposed of?

Storage and Disposal Requirements

Official regulatory documents define strict storage and disposal requirements for Indometacin Sintofarm, most commonly available as 50 mg rectal suppositories.

Classification Official Requirement
Storage Temperature Must be stored at a temperature not exceeding 25°C (77°F).
Environmental Protection Must be stored protected from light and protected from moisture
Packaging Rule Must be kept in the original package (blister and outer carton).
Child Safety Must be kept out of the sight and reach of children.

Disposal must also follow specific regulations. Expired or unused Indometacin Sintofarm must not be thrown away with household waste or disposed of via wastewater. Users are instructed to consult a pharmacist for guidance and to discard the medicine according to local environmental requirements for pharmaceutical waste.

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

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