Fenacof

Quick links to important sections

Medically reviewed

Marina Burgos

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 Fenacof

Property Description
Active ingredient Diclofenac (usually as Diclofenac Sodium)
Forms Tablet, injection, topical gel, suppository, ophthalmic solution
Pharmacological class Nonsteroidal Anti-Inflammatory Drug (NSAID)
General purpose Relief of pain, inflammation, and fever
Origin Synthetic compound (Phenylacetic acid derivative)

Defining Fenacof: Identity and Pharmacological Class

Fenacof is a pharmaceutical preparation whose active component is the Nonsteroidal Anti-Inflammatory Drug (NSAID), Diclofenac. It is classified within the anti-rheumatic and anti-inflammatory groups. Diclofenac, often utilized as Diclofenac Sodium, is a synthetic compound derived from phenylacetic acid. Its primary function relates to anti-inflammatory properties. This classification sets Fenacof apart from pure analgesic medicines, such as those that only manage central pain signals, highlighting its dual capability to mitigate both the symptom (pain) and the underlying process (inflammation).


Composition, Forms, and General Purpose

The primary function of Fenacof is to provide systemic relief from inflammation, associated pain (analgesia), and elevated body temperature (antipyresis). Its composition features the active Diclofenac Sodium along with specific excipients, which vary depending on the chosen delivery method. Fenacof is available in multiple forms to allow for diverse routes of administration, including systemic preparations like oral tablets and solutions for injection (parenteral), as well as localized forms such as topical gels and ophthalmic solutions. As an NSAID, it works by reducing substances that cause pain and swelling. The medication functions by blocking certain substances the body makes that cause inflammation, making it useful for relieving musculoskeletal discomfort. This range of dosage forms ensures that the medicine can be applied for general body relief or targeted action at a specific site of discomfort, supporting its overall purpose in controlling inflammatory responses.


How Fenacof Differs from Other Analgesics

Fenacof, as a Cyclooxygenase (COX) Inhibitor, differs from simpler analgesics by acting directly on the biochemical synthesis pathways that create inflammatory mediators. While its physiological action is complex, the mechanism involves reducing pain by limiting the production of prostaglandins, the chemical signals that trigger swelling and transmit pain. Unlike pure pain relievers that simply alter the perception of discomfort, or corticosteroids that broadly suppress the immune system, Fenacof targets this specific enzyme system, providing an anti-rheumatic agent effect useful for managing conditions characterized by inflammation and mild-to-moderate pain. This mechanism of action differentiates its therapeutic profile within the array of pain management options.

What side effects are possible with Fenacof?

Possible Side Effects and Safety Information: Fenacof

Fenacof's safety profile, based strictly on government regulatory documents, details adverse reactions classified by frequency and affected body system, along with critical safety limitations.

Adverse Reactions by Frequency and System-Organ Class

The following are documented side effects categorized by how often they occur and the body system involved.

Frequency Classification Examples of Documented Adverse Reactions
Very Common (≥1/10) Headache, Dizziness, Nausea
Common (≥1/100 to <1/10) Diarrhea, Abdominal Pain, Fatigue
Uncommon (≥1/1,000 to <1/100) Rash, Vertigo, Vomiting

Adverse effects are also categorized by System-Organ Class (SOC), including Gastrointestinal Disorders, Nervous System Disorders, Skin and Subcutaneous Tissue Disorders, and Hepatobiliary Disorders.


Serious Reactions and Safety Constraints

Serious Adverse Reactions documented in official labeling, although rare, include Anaphylactic Reaction, Angioedema, Stevens-Johnson Syndrome (SJS), and Agranulocytosis.

Safety Restrictions and Limitations formally state that Fenacof is Contraindicated in severe hepatic impairment. It is also Contraindicated in patients with a history of Angioedema related to Fenacof or similar agents.

Population-Specific Considerations note a documented increased risk of specific gastrointestinal events in older adults. For patients with renal impairment, specific monitoring or dose adjustments are formally documented.

Overdose and Emergency Response

Overdose and When to Seek Help

Overdosage of Fenacof (Diclofenac) is documented in official regulatory materials, outlining specific clinical manifestations and mandated emergency actions.

Documented Overdose Presentations and Outcomes

Overdose may initially present with common gastrointestinal disturbances, including nausea, vomiting, stomach pain, and diarrhea, alongside central nervous system effects such as drowsiness, headache, and dizziness. More severe presentations are recognized to include convulsions, coma, and signs of serious gastrointestinal bleeding.

Life-threatening outcomes documented in the regulatory profile include fatal cardiovascular thrombotic events (such as stroke or myocardial infarction), acute renal failure, liver failure, and severe gastrointestinal ulceration and perforation. Elderly patients and individuals with a prior history of peptic ulcer disease or GI bleeding are noted to be at greater risk for serious gastrointestinal events.

Required Emergency Actions

The official guidance mandates that patients seek immediate medical attention for a suspected overdosage. Emergency help must be sought immediately if signs of an anaphylactic-like reaction occur. Management is based strictly on symptomatic and supportive treatment, as regulatory documents explicitly state that no specific antidote is known for Diclofenac. Due to high protein binding, procedures such as hemodialysis or forced diuresis are considered unlikely to be effective.

Therapeutic Uses of Fenacof

What Fenacof treats: main uses and benefits

Fenacof is used in contexts where symptomatic support is required for the management of distressing symptoms. This medication is applied for short-term symptom management, primarily focusing on addressing discomfort and symptoms related to inflammation and swelling.

It is generally utilized to assist with symptoms related to systemic imbalance, including generalized aches and fever. It is also relevant for easing challenging symptoms associated with specific conditions. This includes managing symptoms linked to joint conditions such as osteoarthritis and rheumatoid arthritis; symptoms associated with acute or episodic changes, such as acute migraine attacks and primary dysmenorrhea; and symptoms related to temporary functional strain, such as sprains or post-surgical discomfort.

The medicine helps address symptom clusters that may become intense or disruptive, assists with maintaining functional stability, and contributes to easing the overall symptom load during symptomatic periods.

Quick Fact: Relevant for Pain and Inflammatory Symptom Management.

Regulatory References

  1. NIH MedlinePlus overview

Eligibility and Restrictions for Use

Fenacof (Diclofenac) is governed by strict population eligibility rules outlined by regulatory bodies. It is contraindicated and must not be used by several specific patient groups.


Contraindicated Populations

Use is explicitly prohibited if the patient has:

  • A known allergy to diclofenac or a history of asthma, hives, or other allergic reactions triggered by aspirin or other Nonsteroidal Anti-Inflammatory Drugs (NSAIDs).
  • Perioperative pain associated with Coronary Artery Bypass Graft (CABG) surgery.
  • Severe organ failure, including advanced renal disease or hepatic failure, or active gastrointestinal ulceration, bleeding, or perforation.
  • Pregnancy starting at 30 weeks gestation or later.

Population Restrictions and Limitations

The medicine is permitted for adults for approved uses. However, safety and effectiveness are not established for use in young children (under 12 or 16 years, depending on the formulation).

Older adults require particular caution due to increased susceptibility to adverse effects. Caution is also necessary for patients with severe heart failure. Furthermore, use may impair fertility in women of reproductive potential.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Fenacof (Diclofenac) interacts with several medicinal product categories and substances as formally documented in regulatory information. All interaction statements are derived strictly from government drug labels and prescribing information.


Formal Interaction Restrictions

Co-administration with Aspirin or other Nonsteroidal Anti-Inflammatory Drugs (NSAIDs) is documented as a contraindicated combination due to an officially increased risk of serious gastrointestinal (GI) adverse events. Additionally, Fenacof is contraindicated for the treatment of pain in the peri-operative setting of Coronary Artery Bypass Graft (CABG) surgery.


Exposure and Pharmacodynamic Interactions

Interacting Product Category Officially Documented Outcome
Anticoagulants / SSRIs / Corticosteroids Increased risk of bleeding, consistent with a pharmacodynamic additive risk.
ACE Inhibitors / ARBs / Diuretics Diminished blood pressure-lowering or natriuretic effect of the co-administered medicine.
Lithium, Digoxin, Methotrexate Co-administration may increase the plasma concentrations of these medicines.
Voriconazole (CYP Inhibitor) Formally documented as a pharmacokinetic interaction that increases the systemic exposure of Fenacof.

Substance and Population Notes

Alcohol (Ethanol) and Tobacco (Smoking) are formally listed as substances that increase the risk of serious GI bleeding and ulceration. Furthermore, the official label notes that the interaction with ACE Inhibitors or ARBs in elderly, volume-depleted, or renally impaired patients may specifically result in deterioration of kidney function.

Mechanism of Action

How Fenacof Works

Primary Mechanism: Inhibition of COX Enzymes

The mechanism of action for Fenacof (Diclofenac) involves the modulation of core biochemical pathways that produce eicosanoids. The action acts upon the Cyclooxygenase (COX) enzyme system. Fenacof acts as a non-selective competitive inhibitor of both the COX-1 and COX-2 enzymes, directly blocking them from converting arachidonic acid into various mediators. This initial molecular blockade limits the activity of the eicosanoid pathway, which initiates the subsequent physiological changes.

Pathway Effect: Modulation of Prostaglandin Synthesis

By reducing COX activity, the drug decreases the cellular synthesis of prostaglandins, particularly PGE2, at sites of injury and within the central nervous system. This reduced mediator level decreases the sensitization of peripheral nociceptors and interferes with the PGE2 mediation that elevates the hypothalamic thermoregulatory set-point.

Physiological Outcome: Altered Signaling Dynamics

The reduced presence of prostaglandins leads to two main outcomes: the desensitization of pain-sensing neurons and the alteration of the central temperature regulatory set-point. These physiological adjustments result in altered peripheral and central signaling dynamics within the affected pathways.

Dosage and Administration Information

How to use Fenacof

Fenacof, which contains the active substance Diclofenac, is administered via multiple routes, including oral (tablets, capsules, solutions), parenteral (intramuscular or intravenous injection), rectal (suppositories), and localized routes such as topical and ophthalmic preparations. The choice of administration route is dictated by the intended site of action, with oral forms being the most common for systemic use.

The standard dosing regimen requires administration in divided doses for immediate-release formulations, typically two or three times daily (BID or TID), with an adult daily maintenance dose ranging from 75 mg to 150 mg total per day. Extended-release tablets are generally prescribed as a single, once-daily dose, most commonly 100 mg. Maximum daily oral doses adhere to limits, generally not exceeding 150 mg to 200 mg.

Administration protocols specify particular use constraints: standard oral tablets may be taken with food or milk to improve gastric tolerance, while certain formulations, such as the powder for oral solution, are explicitly directed to be taken on an empty stomach. The physical integrity of the dose form must be maintained; for instance, extended-release tablets must be swallowed whole and cannot be crushed or split. For parenteral use, which is reserved for acute, short-term courses, the total daily dose is typically limited to 150 mg and must be administered in a supervised setting. Fenacof is intended for use at the lowest effective dosage for the shortest duration necessary, particularly for populations such as older adults, which is a foundational principle of the usage protocol.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Fenacof

The research for Fenacof (Diclofenac) consists of clinical evaluations conducted primarily through controlled clinical trials and large-scale, long-term observational studies. This overview describes the research framework and patterns observed in studies, without offering clinical recommendations or individual advice.


Evidence for Symptomatic Management of Chronic Joint Conditions

For conditions characterized by functional limitations, like Osteoarthritis (OA), research has primarily relied on short-term (2 to 12 weeks) randomized controlled trials used in studies examining patient-reported experiences. Researchers monitored outcomes such as scores on standardized pain scales and assessments of joint stiffness and mobility. Studies reported measurements of patient-reported outcomes describing perceived discomfort across the short-term study period. Studies explored topical formulations in OA research by measuring outcomes related to localized pain and function.

In conditions involving periods of heightened symptoms, such as Rheumatoid Arthritis, research examined the effects on clinical measures of inflammation. Trials primarily monitored outcomes describing episodic or acute changes, like the number of swollen joints and the duration of morning stiffness. This research explored how symptoms change over time in the populations observed in the study.


Evidence for Acute Pain Management and Symptom Relief

Research related to acute, temporary physical discomfort, such as sprains, strains, or post-operative discomfort, mainly involved very short-term RCTs, often lasting only a few days or one treatment episode. Data show patterns related to how rapidly outcomes describing episodic or acute changes were measured in the observed populations. Similarly, specialized, rapid-onset oral formulations was studied for acute migraine attacks in research focusing on episodes where symptoms become more noticeable. These trials assessed outcomes related to achieving pain-free status or substantial pain relief within two hours and monitored for pain recurrence within 24 hours.


Areas of Research Uncertainty and Study Gaps

While high-quality RCTs have evaluated Fenacof for short-term symptomatic changes, long-term effects are not fully established by efficacy trials that track outcomes over multiple years. The overall evidence quality varies across studies, particularly for long-term follow-up and in certain specific populations. Comparative evidence is lacking in high-quality trials when examining Fenacof against all available modern treatments across every single indication.

Frequently Asked Questions (FAQ)

Common questions about Fenacof (FAQ)

Q: How to store and dispose of Fenacof?

A: Official information requires Fenacof to be stored at controlled room temperature, generally protected from moisture and excessive heat. It is directed that the medicine be kept in its original container, ensured to be tightly closed, and, most importantly, kept out of the sight and reach of children. Unused or expired medicine must be disposed of safely via authorized drug take-back programs according to local guidelines.

Q: Does Fenacof cause fatigue or drowsiness?

A: Regulatory documents list central nervous system effects such as dizziness, vertigo, and fatigue as common adverse reactions. While the official documents do not frequently use the specific term 'drowsiness,' these listed effects suggest potential changes in alertness. Official sources note that if effects like dizziness occur, caution should be exercised during activities requiring concentration.

Q: Can Fenacof affect my blood pressure?

A: Official regulatory warnings note that taking medicines like Fenacof may be associated with the new onset or worsening of high blood pressure (hypertension). For this reason, official guidance describes that blood pressure should be monitored closely during treatment.

Q: Is Fenacof a type of antibiotic?

A: No, Fenacof is classified as a Nonsteroidal Anti-Inflammatory Drug (NSAID). Its primary function is to relieve pain, inflammation, and fever by targeting specific enzymes, which is different from how antibiotics work to fight bacterial infections.

Q: Are there long-term side effects associated with Fenacof?

A: Regulatory documents describe that the risk of serious side effects, particularly cardiovascular and gastrointestinal events, may increase with the duration of use. Therefore, official guidance recommends using the drug for the shortest possible duration consistent with the desired outcome to minimize these risks. Long-term use of this class of medicine has also been associated with effects on kidney function.

Q: Is it true that Fenacof has been studied for conditions other than its main use?

A: Studies and official information indicate that Fenacof is formally indicated for the management of various forms of osteoarthritis and rheumatoid arthritis, as well as other conditions such as acute pain and ankylosing spondylitis. This shows a broad range of researched applications for symptomatic relief.

Q: What should I know about the safety profile of Fenacof?

A: The safety profile is outlined in official documents, including a Boxed Warning that alerts users to the potential for serious, life-threatening cardiovascular and gastrointestinal events. Fenacof is also explicitly contraindicated (prohibited) in specific patient populations, such as those with severe organ failure or a history of allergic reactions to NSAIDs.

Q: Is Fenacof safe for older adults?

A: Regulatory documents note that older adults are at a greater risk for serious gastrointestinal and renal adverse events than younger patients. Official guidance directs that Fenacof should be used in this population with caution and that treatment should start at the lowest effective dose.

Q: How quickly does Fenacof start to work?

A: Clinical pharmacology data for certain oral formulations indicates that meaningful pain relief can begin approximately 30 minutes after administration in some patient studies. The time it takes to notice an effect can vary depending on the specific formulation used and the individual patient.

Q: How long does the effect of one Fenacof dose last?

A: The duration of the analgesic effect has been observed in clinical studies to be approximately six hours for some immediate-release formulations. This duration may differ based on the specific type of Fenacof used and individual patient metabolism.

Q: Can Fenacof be taken with common cold and flu medicines?

A: Official warnings contraindicate the concomitant use of Fenacof with aspirin or other Nonsteroidal Anti-Inflammatory Drugs (NSAIDs). Since many common cold and flu medicines contain other NSAIDs, using them together is a safety note in official documents.

Q: Is it possible to take Fenacof on an empty stomach?

A: Administration conditions vary by the specific formulation of the medicine. Regulatory guidelines state that some oral tablets are directed to be taken with food or milk, while other forms, such as the powder for oral solution, are explicitly directed to be taken on an empty stomach.

Q: Are there any specific foods that can interact with Fenacof?

A: Clinical studies generally show that food has no significant effect on the total amount of Fenacof absorbed by the body. However, taking it with food typically causes a delay in the onset of absorption and may reduce the peak amount of the drug in the bloodstream.

Q: Can young adults or teens use Fenacof?

A: The safety and effectiveness of Fenacof in children under 18 years of age (pediatric patients) are not established for all formulations. For certain indications, the drug may be used under specific medical guidance where dosing is weight-adjusted.

Q: What happens if I miss a scheduled dose of Fenacof?

A: Patient information describes that if a dose is missed, it is often taken as soon as it is remembered, unless it is nearly time for the next scheduled dose. If it is nearly time, the instruction is to skip the missed dose and resume the normal schedule. The instruction is generally to not take two doses to make up for a forgotten one.

Q: Is Fenacof known to cause stomach upset?

A: Yes, regulatory documents list adverse events such as Diarrhea and Abdominal Pain as common reactions, consistent with the user term 'stomach upset.' Because of the potential for gastrointestinal irritation, official use protocols recommend taking some formulations with food.

Q: Can Fenacof make you dizzy?

A: Yes, dizziness is officially listed as a very common or common adverse reaction in regulatory documents for Fenacof. Official sources note that if effects like dizziness occur, caution should be exercised during activities requiring concentration.

Q: Can Fenacof affect sleep patterns?

A: Official labeling lists some effects related to the nervous system and psychiatric disorders. While it does not commonly list 'sleep patterns' or 'insomnia' as frequent adverse reactions for most formulations, all potential effects are detailed in the official safety documents.

Q: Does Fenacof need to be taken at a specific time of day?

A: The official protocol specifies taking doses in divided intervals (e.g., two or three times daily) or once daily for extended-release forms. However, the guidance does not generally mandate administration at a specific time of day, such as only in the morning or only at night.

Q: Is Fenacof considered a high-risk medication?

A: Regulatory documents include a Boxed Warning concerning the potential for serious, life-threatening cardiovascular and gastrointestinal events. This type of prominent regulatory warning indicates the potential for serious risk associated with the medicine, as determined by regulatory agencies.

Q: Is there a limit to how long Fenacof can be used?

A: Official guidance describes that Fenacof should be used for the shortest duration necessary to manage symptoms, which is intended to minimize the risk of serious adverse events. It also specifies that daily doses generally should not exceed 150 mg to 200 mg total per day.

Q: Why do official documents mention specific safety warnings for certain conditions?

A: Official regulatory bodies require that specific serious risks be formally communicated to the public and healthcare providers. This requirement, often outlined in documents like Risk Management Plans, ensures the medicine's benefits continue to outweigh its risks in the target population under real-world use conditions.

Q: Is Fenacof used to treat a fever?

A: Yes, Fenacof is officially classified as an NSAID and possesses antipyretic properties, meaning it is used for the relief of elevated body temperature (fever), in addition to its anti-inflammatory and pain-relieving effects.

Q: Is Fenacof a commonly prescribed medication?

A: The active substance in Fenacof is listed on the World Health Organization (WHO) Model List of Essential Medicines. This classification is used globally to recognize its therapeutic importance and indicates its wide use in basic health systems.

Q: Does Fenacof contain ingredients that can be habit-forming?

A: No, Fenacof (Diclofenac) is not classified as a controlled substance by the DEA and is not listed as having a risk of dependency or habit-forming potential in official documents.

Q: What are the most common reasons people stop taking Fenacof?

A: Clinical trial data on discontinuation commonly cites the occurrence of adverse events as a reason for people to stop taking the medicine. These adverse events often involve gastrointestinal issues or other serious reactions detailed in the official safety profile.

Q: What is the difference in how Fenacof is described by the FDA versus the EMA?

A: While both agencies share the goal of ensuring safety and efficacy, they may differ in their regulatory approaches. For instance, the U.S. FDA uses Risk Evaluation and Mitigation Strategies (REMS) while the European EMA uses Risk Management Plans (RMP), leading to differences in communication requirements and public documentation.

Q: Why is Fenacof available only by prescription in some regions?

A: The decision on a drug's legal status (prescription vs. non-prescription) is made by each region's regulatory authority based on its assessment of the risk-benefit balance. The classification depends on whether the drug requires medical supervision to be used safely.

Q: Does Fenacof affect birth control?

A: Official patient information generally indicates that Fenacof does not affect hormonal contraceptives, which include the combined oral pill or the progestogen-only pill.

How should Fenacof be stored and disposed of?

How to Store and Dispose of Fenacof?

Fenacof, which contains Diclofenac, must be stored according to official regulatory specifications to maintain its stability and potency.

Official Storage Requirements

Condition Requirement (Based on Regulatory Labeling)
Temperature Store at controlled room temperature, typically below 25 C or 30 C.
Protection Must be protected from moisture and excessive heat.
Packaging Keep the medicine in its original container and ensure the container is tightly closed.
Safety It is mandatory to keep all medication out of the sight and reach of children.

Disposal Instructions

Unused or expired Fenacof must be disposed of safely according to local guidelines for pharmaceutical waste. The preferred method is often an authorized drug take back program. Care should be taken to avoid environmental release of the active ingredient.

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

Available in countries:

Equivalent of Fenacof found in:

A-Z Index: