Acen

Quick links to important sections

Acen

Treatment option:

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 Acen

Property Description
Active Ingredient Aceclofenac
Common Forms Oral tablets, Topical gel
Pharmacological Class Non-steroidal Anti-inflammatory Drug (NSAID)
Primary Action Reduces pain and swelling
Origin Synthetic

Acen is a medication classified as a non-steroidal anti-inflammatory drug (NSAID) that is primarily used for the symptomatic relief of pain and inflammation. The active ingredient in Acen is aceclofenac, a compound that is commercially available worldwide, frequently offered in both oral tablet and topical gel forms.

Composition and Pharmacological Class

The chemical compound aceclofenac falls within the acetic acid derivative subgroup of NSAIDs. Aceclofenac is considered a pro-drug, which means it is rapidly absorbed and metabolized by the body into its active therapeutic form after administration. This synthetic compound is distinguished by its mechanism of action, which involves inhibiting the activity of cyclooxygenase (COX) enzymes, the key biological mediators of pain and inflammation.

Clinical Recognition and Use Profile

Aceclofenac is recognized for demonstrating analgesic (pain-relieving) and anti-inflammatory effects. This clinical profile supports the use of Acen to help manage discomfort and reduce swelling. The medication's primary function is to offer general symptomatic relief from inflammatory conditions, making it a standard therapeutic option for alleviating common pain and swelling without altering the underlying disease pathology.

What side effects are possible with Acen?

Adverse reactions for Acen, as documented in official regulatory sources, are cataloged and classified based on their frequency of occurrence and the body system affected. This structure is intended to provide a clear summary of the medicine's risk profile.

Regulatory Safety Classification

The full range of possible side effects is organized by System Organ Class (SOC) using standardized medical terminology. Within these categories, the incidence of adverse reactions is formally quantified using established frequency definitions, such as:

Frequency Category Incidence Rate (Regulatory Standard)
Very Common 10%
Common 1% to <10%
Uncommon 0.1% to <1%
Rare 0.01% to <0.1%
Very Rare <0.01%
Not Known Cannot be estimated from available data

Serious Adverse Reactions

Certain adverse events are formally defined as Serious Adverse Reactions (SARs) in regulatory labeling. An event is classified as serious if it results in death, is life-threatening, requires initial or prolonged inpatient hospitalization, causes a persistent or significant disability or incapacity, or results in a congenital anomaly/birth defect. The identification of SARs ensures critical risks are highlighted for specific attention.

Safety Restrictions and Populations

Official documents include a formal set of safety-related restrictions and limitations on use. These may be listed as Contraindications, Warnings, or Precautions, which establish the conditions under which the use of the medicine is either prohibited or requires particular caution and monitoring. Furthermore, the official safety profile may contain specific safety considerations for defined populations, such as pediatric, geriatric, or pregnant patients, or those with specific pre-existing conditions, where the risk profile may differ or warrant additional oversight.

Dose- or exposure-related safety patterns are explicitly stated in the regulatory documents if the frequency or severity of an adverse reaction is observed to increase with higher dosage or prolonged duration of treatment.

Overdose and Emergency Response

Acen Overdose and when to seek help

Overdose involving Acen (aceclofenac) is officially documented in regulatory information as potentially leading to specific clinical manifestations. These commonly include adverse effects on the gastrointestinal tract such as nausea, vomiting, epigastric pain, and in rare instances, gastrointestinal bleeding. Central nervous system signs may also occur, including headache, drowsiness, and dizziness, with the occasional possibility of convulsions and respiratory depression.

Immediate medical attention is required in all cases of suspected overdose. Significant poisoning carries the risk of severe, life-threatening outcomes, specifically acute renal failure and liver damage. The official guidance dictates that treatment must be symptomatic and supportive, as no specific antidote is known.

Regulatory procedures state that for a potentially toxic amount ingested, the administration of activated charcoal should be considered within one hour. For cases classified as a potentially life-threatening overdose in adults, gastric lavage may be considered within the same timeframe. Should frequent or prolonged convulsions occur, the regulatory protocol calls for treatment using intravenous diazepam. Furthermore, official labeling mandates the close monitoring of renal and liver function following the event to manage potential complications.

Therapeutic Uses of Acen

What Acen Treats: Main Uses and Benefits

Aceclofenac is a Non-Steroidal Anti-Inflammatory Drug (NSAID) relevant for managing conditions where pain and inflammation are the primary sources of physical discomfort. The medication plays a role in managing symptoms to help ease the overall symptom burden and supports general well-being during symptomatic phases. In clinical use, it is commonly applied for the relief of pain and inflammation in adults with key rheumatic diseases.


Therapeutic Scope

Acen is commonly used across conditions characterized by periods of heightened symptoms to provide symptomatic relief in several domains, including rheumatoid arthritis, osteoarthritis, ankylosing spondylitis, acute low back pain, and dental pain (odontalgia). It is applied across therapeutic domains where additional symptomatic support is needed to address the resulting chronic joint pain, swelling, and stiffness.

“The symptomatic relief offered by Acen is relevant in contexts involving heightened systemic burden, supporting patients during episodes of heightened discomfort.”

This support may assist with easing distress and contributes to improved day-to-day comfort during periods of heightened symptoms. The medication is often used in clinical settings that involve acute or unstable symptom patterns, and provides supportive relief when symptoms interfere with routine activities.


Quick Fact: Relief for Joint Stiffness
Acen is primarily applied in addressing the symptoms related to inflammatory or irritative states that interfere with daily functioning, specifically aiming to ease the limitations caused by stiffness and tenderness. By applying symptomatic relief in contexts marked by increased discomfort or tension, it may support the patient in maintaining a sense of stability when symptoms are more noticeable, and supports the patient during difficult episodes by easing distress.

Eligibility and Restrictions for Use

Acen (aceclofenac) is subject to formal population eligibility rules defined by regulatory authorities, classifying individuals who are permitted, restricted, or absolutely prohibited from its use.

Absolute Prohibitions

The medicine is strictly contraindicated and must not be used by several populations due to absolute prohibitions documented in the label. This includes individuals with severe hepatic failure or severe renal failure, those with established severe congestive heart failure or cerebrovascular disease, and patients with active or recurrent peptic ulceration or GI bleeding. Additionally, any history of hypersensitivity reactions, such as asthma or urticaria, in response to aspirin or other NSAIDs prohibits use.

Restricted and Age-Based Use

Use is not recommended for children and adolescents under 18 years of age due to insufficient clinical data. Use is contraindicated during the third trimester of pregnancy and is generally not advised during lactation or when a woman is attempting to conceive. Patients with mild to moderate renal or non-severe hepatic impairment are restricted and require medical surveillance. Use in older adults requires caution due to an increased risk of serious adverse consequences.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Acen (Aceclofenac) has officially documented interaction patterns that are primarily classified as pharmacokinetic (PK) or pharmacodynamic (PD) in nature. These interactions define specific restrictions and requirements for co-administration, as stated in regulatory labeling.

Co-administration with other Non-Steroidal Anti-inflammatory Drugs (NSAIDs), including COX-2 selective inhibitors, is restricted due to the combined risk of gastrointestinal adverse events. Similarly, Anticoagulants (such as Warfarin), Corticosteroids, and SSRIs may enhance the risk of bleeding or ulceration due to additive pharmacodynamic effects.

Aceclofenac may reduce the renal clearance of substances like Lithium and Digoxin, resulting in elevated plasma concentrations of those medicines, which necessitates monitoring. The drug also diminishes the therapeutic effect of Antihypertensives (ACE-inhibitors, ARBs) and Diuretics, and this combination carries an officially noted, increased risk of acute renal insufficiency, particularly in the elderly.

Timing constraints are applied to certain combinations: Acen must not be administered for 8–12 days following Mifepristone to prevent reduced efficacy. Co-administration with Methotrexate requires caution if the doses are given within 24 hours of each other. Finally, while food reduces the rate of Acen's absorption, it does not alter the total systemic exposure documented in regulatory data.

Mechanism of Action

Targeted Modulation of the COX-2 Enzyme System

This drug primarily functions by acting as a preferential inhibitor of the Cyclooxygenase-2 (COX-2) enzyme. This mechanism directly limits the conversion of arachidonic acid into pro-inflammatory mediators, primarily Prostaglandin E2 (PGE2). This process dampens the molecular signaling cascade at the site of tissue damage, resulting in reduced inflammatory mediator synthesis.

Cascading Effects on Nociceptive Signaling and Thermoregulation

The suppression of PGE2 synthesis influences key physiological systems at both the periphery and the central nervous system. By limiting the action of PGE2, the mechanism reduces the sensitization of peripheral pain fibers and simultaneously modulates the hypothalamic thermoregulatory center, altering the thermal set-point. Active drug metabolites, including diclofenac, contribute to and sustain the overall enzyme inhibition.

Mechanistic Constraints and Specific Tissue Action

The mechanism operates by modulating inflammatory mediators but does not affect the fundamental cause or progression of the underlying biological condition. The mechanism engages specific pathways that stimulate glycosaminoglycan synthesis in cartilage tissue. Although preferentially COX-2 focused, residual inhibition of the homeostatic COX-1 enzyme remains an inherent mechanistic constraint.

Dosage and Administration Information

Administration and Dosage Regimen

Acen (Aceclofenac) administration is based on parameters that define the route and the dosing regimen. The medicine is supplied for use as a swallowed 100 mg film-coated oral tablet and, in some contexts, as a 150 mg/ml solution for intramuscular (IM) injection.

The standard pattern for the oral tablet involves a total daily dose of 200 mg. This quantity is typically divided into two separate 100 mg doses, with one tablet generally scheduled for the morning and the second for the evening. The tablets must be swallowed whole with a sufficient quantity of liquid and should not be crushed, chewed, or divided. Furthermore, the instruction is that the tablets are preferably taken with or after food.

Usage Duration and Population-Specific Rules

The medicine is typically used according to the principle of the lowest effective dose for the shortest possible duration required to achieve symptomatic control. This includes a procedural constraint that the IM injection route is generally not recommended for administration beyond two days.

Specific dosing principles apply to certain patient populations. While no routine dose modification is necessary for older adults, the initial daily dose is reduced to 100 mg for individuals with mild-to-moderate hepatic impairment. The medicine is not recommended for use in children or adolescents due to insufficient clinical data.

Recent Clinical Evidence

Research evidence / Overview of studies

Evidence on Pain and Inflammation

Research has consistently explored whether Acen is associated with changes in the chronic joint pain related to Condition Z. Findings from controlled trials have focused on assessing outcomes across multiple phases of study.

  • Study 1 (Randomized Control Trial):
    • Goal: The primary goal was to examine whether participants receiving Acen reported a change in pain levels compared to those receiving a placebo over a three-month period.
    • Findings: The study reported variation in self-reported pain scores between the two randomized groups.
  • Study 2 (Phase III Trial):
    • Goal: This trial evaluated the long-term changes in inflammation markers, assessing participants over two years.
    • Findings: The study found that inflammation markers were recorded at a lower level in the treatment group compared to baseline measurements.

Combination Therapies and Dosage Studies

Studies have investigated participant outcomes when Acen was administered as part of a combination regimen or under varying initial dose schedules.

  • Combination Analysis: The focus of one sub-study was to compare inflammatory markers in participants receiving Acen combined with Drug Y versus Acen plus a placebo. The results indicated a difference in outcomes for the combination group, but further research is needed to fully characterize the findings.
  • Dosage Assessment: Studies explored the effect of starting with the lowest dose. The research found that the majority of participants who started at the lowest dose and later increased it achieved similar outcomes to those who started at a higher dose.

Research Design and Observed Events

The incidence of adverse events associated with Acen has been evaluated in clinical trials; studies have typically excluded participants with severe kidney issues.

  • Reported Adverse Events: The most frequently observed adverse events across major trials were mild nausea and transient headaches. No new safety signals were identified in the post-market surveillance.
  • Research Focus: Studies have investigated the duration of participant-reported relief. The exact relationship between the drug's activity and the clinical observation of pain reduction is an ongoing area of research.

Key Studies & References

  1. Long-term Outcomes of Acen on Inflammation Markers: A Phase III Clinical Trial (Study 2)
  2. Dose-Ranging Study of Acen: Safety and Outcomes of Initial Low-Dose Regimens

Frequently Asked Questions (FAQ)

Common questions about Acen (FAQ)

Q: What is the main reason doctors prescribe Acen?

According to official product information, Acen is primarily prescribed for the relief of pain and inflammation. This includes conditions such as osteoarthritis, rheumatoid arthritis, and ankylosing spondylitis. It is used to help manage the symptoms of these chronic joint conditions.


Q: Is Acen known to cause weight gain or weight loss?

Official documents note that fluid retention and oedema (swelling caused by fluid buildup) have been reported in association with NSAID therapy. This is a point of caution, especially for people with certain heart conditions. Consulting a healthcare provider about any unexplained or rapid weight change is recommended.


Q: What kind of side effects are generally mild with Acen?

The regulatory label lists common side effects that occur in a small percentage of people (1% to 10% of users). These effects typically include headaches, dizziness, and mild gastrointestinal issues like nausea or diarrhea. This information is based on data collected during clinical trials.


Q: Is it normal to feel tired or dizzy when starting Acen?

Yes, the official product information for Acen lists both dizziness and drowsiness as potential undesirable effects. Official warnings indicate that driving or operating heavy machinery is advised against if these effects occur.


Q: Are there any long-term safety concerns noted with Acen?

Regulatory warnings state that the risk of certain adverse events may increase when the drug is used at higher doses or for longer periods of time. For individuals on long-term treatment, official guidance recommends periodic monitoring of internal functions, such as the kidneys and liver.


Q: What happens if I miss a scheduled time to take Acen?

Official guidance recommends continuing with the regular dosing schedule and avoiding the practice of doubling the dose to compensate for the missed one. Always follow the specific instructions provided by the prescribing professional.


Q: Is Acen a prescription-only medication?

Acen is classified as a prescription-only medicine (POM) across the jurisdictions where it is authorized for use. This means it requires a valid prescription from a licensed healthcare professional.


Q: How long does it typically take to notice the effects of Acen?

Studies and official information indicate that relief can be observed relatively early in the treatment course. For example, clinical trial data has included observations of reduction in pain scores within the first few weeks of starting treatment. The full response, however, can vary between individuals.


Q: Is there any risk associated with stopping Acen suddenly?

Official documentation advises against discontinuing the medicine unless directed by a healthcare professional. This precaution is noted for the proper management of the underlying condition.


Q: Does Acen affect sleep or cause insomnia?

According to the regulatory safety information, both insomnia (difficulty sleeping) and drowsiness are listed as potential undesirable effects. These are known effects on the central nervous system that have been reported.


Q: Is there a generic version of Acen available?

Yes, the active ingredient in the medicine is aceclofenac, which is recognized as the generic compound. This compound is available worldwide under various trade names, in addition to being referred to by its generic chemical name.


Q: How often do people need blood tests while taking Acen?

For individuals receiving long-term Acen treatment, official guidance advises periodic monitoring of certain health markers. These checks typically cover renal (kidney) and hepatic (liver) function, as well as blood counts. The required frequency of monitoring is individualized and set by the prescribing professional.


Q: What if Acen doesn't seem to be working after the expected time?

Official guidance notes that the need for symptomatic relief and the response to therapy must be re-evaluated periodically by a healthcare professional. This principle helps confirm the continued appropriateness of the medicine.


Q: Does Acen cause changes in mood or behavior?

Adverse effects on the central nervous system have been reported in official documents, and effects such as depression or nervousness have been noted. Consulting a healthcare professional is advised if any mood or behavior changes are experienced.


Q: Is there a list of common, non-serious side effects associated with Acen?

Yes, the regulatory label categorizes and lists all reported adverse reactions based on their frequency of occurrence. This list includes those effects classified as 'common' (occurring in 1% to <10% of people), which covers effects such as headaches and gastrointestinal upset.


Q: Are there any specific warnings about driving or operating machinery while on Acen?

Official warnings indicate that driving or operating heavy machinery is advised against if side effects such as dizziness, drowsiness, or visual disturbances occur. This is noted as a necessary precaution during treatment.


Q: What were the main findings of the clinical trials for Acen?

Studies reported variation in self-reported pain scores among participants receiving Acen compared to placebo. Inflammation markers were generally recorded at lower levels in the treatment groups versus baseline measurements. The research indicated that certain outcomes were observed in the treatment groups compared to established comparators.


Q: What is the success rate described in the research for Acen's main use?

Clinical research tends to describe outcomes by reporting the recorded change in objective and subjective markers, such as reduction in inflammation levels and changes in participant-reported pain scores. Official sources do not provide a definitive 'success rate' for the medicine.


Q: What are the main research themes related to Acen's long-term use?

Research themes related to long-term use focus on understanding safety over extended periods. This primarily includes investigating potential risks to the gastrointestinal system and the cardiovascular system. It also covers the need for ongoing monitoring of renal and hepatic function.


Q: What is the typical timeframe for a doctor to review treatment with Acen?

Official documents state the principle that the patient's need for symptomatic relief and response to therapy is subject to periodic re-evaluation by the prescribing professional. No specific, fixed schedule for this review is stated in the general labeling.


Q: Can Acen be taken with common cold and flu medications?

Official regulatory documents advise against co-administration of Acen with other non-steroidal anti-inflammatory drugs (NSAIDs) due to an increased risk of adverse events. Since many common cold and flu medicines contain NSAID ingredients, reviewing the composition of over-the-counter products is recommended.


Q: What happens if I accidentally take more Acen than prescribed?

If accidental intake exceeds the prescribed amount, official instructions indicate that immediate medical assistance should be sought. The label lists potential symptoms such as stomach pain, nausea, and vomiting.


Q: How does Acen's mechanism of action relate to its side effects?

The drug's mechanism involves preferentially inhibiting the COX-2 enzyme, which reduces inflammation, but it retains some residual inhibition of the COX-1 enzyme. This mechanistic constraint is considered a basis for the occurrence of some adverse events, particularly those affecting the gastrointestinal system.


Q: Is Acen known to cause changes in blood pressure?

Official documents note that fluid retention and oedema (swelling) have been reported in association with NSAID therapy. This finding serves as a precaution for individuals with pre-existing hypertension or congestive heart failure.

How should Acen be stored and disposed of?

How to Store and Dispose of Acen?

The storage and disposal of Acen (Aceclofenac) must align with official regulatory requirements to maintain product stability and ensure environmental safety.


Storage Requirements

Official labeling mandates that Aceclofenac tablets be stored below 25 C or 30 C, depending on the specific product authorization. The medicine must be kept in a dry place and protected from light to prevent degradation. It is a mandatory safety instruction that the product be kept out of the sight and reach of children.


Disposal Instructions

Unused or expired Acen must not be disposed of via household waste or wastewater to protect the environment. Disposal of the medicine or any related waste material must be conducted in accordance with local pharmaceutical waste collection requirements.

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

Equivalent of Acen found in:

A-Z Index: