Fenazol 5%

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Fenazol 5%

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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 Fenazol 5%

Property Description
Active ingredient Flufenamic Acid (FFA)
Form Topical Preparation (e.g., Cream or Gel)
Pharmacological class Nonsteroidal Anti-inflammatory Drug (NSAID)
General purpose Alleviating localized pain and inflammation
Origin Synthetic (Anthranilic acid derivative)

Fenazol 5% and the Fenamate Class of NSAIDs

Fenazol 5% is a commercial pharmaceutical preparation defined by its single active component, Flufenamic Acid (FFA). This substance is formally classified as a Nonsteroidal Anti-inflammatory Drug (NSAID), placing it in a category of medicines used to counteract pain and inflammation. Flufenamic Acid belongs specifically to the anthranilic acid derivative group, which is chemically known as the Fenamate class of NSAIDs.

As a synthetic compound, its function is primarily to act as a cyclooxygenase (COX) inhibitor. Flufenamic Acid's identification as a fenamate derivative confirms its distinct chemical profile within the broader NSAID category.


What Does the 5% Concentration and Topical Form Mean?

The designation Fenazol 5% signifies the concentration of Flufenamic Acid within the product, confirming a five percent strength of the active ingredient delivered through its base. This medicinal entity is formulated as a topical preparation—such as a cream or gel—and is intended strictly for cutaneous application.

This format is a distinguishing feature, focusing the therapeutic effect locally, unlike oral NSAIDs which target systemic circulation. The product is designed to achieve a concentrated effect right where discomfort is experienced, utilizing the chosen format for effective delivery.


General Purpose: Targeting Localized Pain and Inflammation

The general therapeutic purpose of Fenazol 5% is to provide relief by addressing the localized symptoms of discomfort driven by inflammation and pain. Its ability to modulate the production of prostaglandins allows it to directly interrupt the body’s pain and swelling signals.

Flufenamic Acid is clinically recognized for its anti-inflammatory and analgesic properties. The drug is fundamentally designed to help diminish the body’s inflammatory response, assisting in the symptomatic management of general musculoskeletal distress and tissue irritation.

Regulatory References

  1. Flufenamic Acid (NIH PubMed)

What side effects are possible with Fenazol 5%?

Possible Side Effects and Safety Information

Fenazol 5% contains Flufenamic Acid, an NSAID of the fenamate class. The officially documented safety profile addresses both local application site reactions and the systemic risks associated with all Nonsteroidal Anti-inflammatory Drugs, as required by government regulatory bodies (e.g., EMA, FDA).

Common Adverse Reactions

Side effects frequently reported in regulatory documentation are primarily Dermatological Reactions at the application site. These include Erythema (redness), Pruritus (itching), Dermatitis (skin inflammation), and a local burning sensation. Photosensitivity reactions (increased sensitivity to sunlight) are also a documented concern for the NSAID class, requiring caution.

Serious Systemic Risks and Safety Constraints

The most serious documented risks align with the systemic profile of oral NSAIDs. These include the potential for fatal Cardiovascular Thrombotic Events (such as myocardial infarction or stroke) and serious Gastrointestinal Adverse Events (including bleeding, ulceration, or perforation). These serious events can occur at any time during treatment, and the risk may increase with the duration of use.

Use is officially restricted in certain populations and conditions. The preparation is contraindicated in patients with a history of asthma, urticaria, or allergic-type reactions to aspirin or other NSAIDs, and should not be applied to non-intact or damaged skin. Specific warnings also apply to older adults and patients with severe hepatic or renal failure due to increased susceptibility to systemic risks.

Overdose and Emergency Response

Overdose involving Flufenamic Acid (Fenazol 5%) is officially documented to present with several systemic manifestations. These may include gastrointestinal disturbances such as nausea, vomiting, and abdominal pain. Central Nervous System effects are also recognized, often presenting as dizziness, headache, and drowsiness, as well as the sensory disturbance known as tinnitus.

The official regulatory documents categorize certain outcomes as severe or life-threatening, requiring prompt intervention. These severe outcomes include Acute Renal Failure, the onset of convulsions or seizures, significant hypotension, and Gastrointestinal Hemorrhage. Population-specific considerations note that elderly patients and individuals with pre-existing renal or hepatic impairment face an increased risk of severe outcomes during an overdose.

When to Seek Urgent Medical Help

Immediate medical attention is officially mandated upon suspicion of an overdose or if any severe clinical signs develop. It is required to Contact Emergency Services Immediately if symptoms progress to severe manifestations like convulsions or bleeding. Management of overdose is entirely supportive, as no specific antidote is known for Flufenamic Acid. Treatment is focused on symptomatic care and the correction of fluid imbalances. Hospital observation is necessary to monitor for potential delayed severe complications, including deterioration of renal function and monitoring of vital signs, exactly as prescribed in regulatory texts.

Therapeutic Uses of Fenazol 5%

Fenazol 5% is commonly used to help with symptomatic relief in conditions presenting with localized discomfort, and is considered relevant in areas where short-term symptom management is appropriate. The preparation is generally applied when appropriate to address symptoms related to physical discomfort and inflammatory or irritative states localized to a specific area.

This medication is relevant across domains where additional symptomatic support is needed, including acute musculoskeletal injuries like sprains and strains, chronic arthridites, and painful musculoskeletal disorders. It is applied in clinical settings that involve acute or unstable symptom patterns, supporting symptoms that create noticeable physiological strain.

“The symptomatic relief offered supports patients during difficult episodes by easing distress and supports general well-being during symptomatic periods.”

Fenazol 5% is commonly used to help manage symptoms when local swelling or tenderness interferes with routine activities, providing support during episodes of heightened discomfort.


Quick Fact: Relief for Localized Pain and Swelling

This medication is commonly used to help with symptomatic management for mild to moderate pain and is relevant for easing localized inflammatory manifestations in adults and patients 16 years and older.

Eligibility and Restrictions for Use

Who Can and Cannot Use Fenazol 5% (Topical Flufenamic Acid)

The eligibility for using Fenazol 5% is strictly defined by regulatory guidelines, focusing on specific health conditions, age, and application site integrity. The medicine is primarily intended for use by adults, including the elderly, who do not have any official contraindications.


Populations For Whom Use Is Contraindicated

Use of Fenazol 5% is formally contraindicated (must not be used) for the following groups and conditions:

  • Patients with known hypersensitivity or allergy to Flufenamic Acid, any other ingredient in the product, or to Non-Steroidal Anti-Inflammatory Agents (NSAIDs), including aspirin.
  • Women who are in the third trimester of pregnancy.
  • Application onto broken, irritated, or infected skin.
  • Use under occlusive (airtight) dressings or simultaneously with another topical preparation at the same site.

Age and Condition Restrictions

Population Group Regulatory Status
Children and Infants Not recommended (safety and efficacy data are not established).
Pregnant or Lactating Women Not recommended (contraindicated in the third trimester).
Renal or Hepatic Impairment Permitted in adults at standard labeled doses, as low systemic absorption minimizes risk compared to oral NSAIDs.

The official labeling permits use in adults with mild-to-moderate renal impairment without requiring a change in the standard dosage.

What should I know about interactions with other medicines?

Interactions with other medicines and products

This section outlines documented interaction patterns for Fenazol 5% (Topical Flufenamic Acid), a Nonsteroidal Anti-inflammatory Drug (NSAID), based strictly on official government regulatory documents. While systemic absorption from the topical form is typically low, the profile reflects the established risks of the NSAID class.

Category Officially Documented Interaction Patterns
Medicinal product categories with documented interactions: Oral Anticoagulants, Other NSAIDs, SSRIs, Diuretics, Antihypertensives, Lithium salts, Methotrexate, Antacids (Magnesium Hydroxide).
Mechanistic basis (only if stated in label): Inhibition of CYP2C9 enzyme (potential), reduction of renal clearance, pharmacodynamic effects on platelet function, reduction of antihypertensive/diuretic effect.
Interaction-related restrictions: Avoid concomitant use with other NSAIDs or Aspirin due to the potential for additive adverse gastrointestinal effects.
Timing-based interaction rules: NSAIDs should not be taken for 8–12 days following administration of Mifepristone, as this may reduce its effects.
Population-specific interaction notes: Elderly patients are noted to have an increased risk of renal impairment when Fenazol is co-administered with ACE Inhibitors or Angiotensin-II-receptor antagonists.

Official interaction statements:

  • Co-administration with Oral Anticoagulants may increase the risk or severity of bleeding and hemorrhage.
  • Use with Lithium or Methotrexate may result in increased plasma concentrations of these agents due to reduced renal clearance.
  • Concomitant ingestion of Antacids containing Magnesium Hydroxide has been shown to significantly increase the absorption of oral Fenamate NSAIDs.

Connection to the overall interaction profile:

The regulatory profile defines the product's interaction structure primarily through its membership in the NSAID class, detailing established pharmacodynamic risks like additive bleeding and pharmacokinetic risks such as reduced renal clearance of co-administered drugs. The profile mandates specific constraints, including the avoidance of combination with other NSAIDs and timing separation after Mifepristone, as explicitly written in prescribing information.

Mechanism of Action

Fenazol 5% acts by engaging two primary mechanistic pathways. The compound first targets the P4502D6 enzyme, functioning as a reversible non-competitive inhibitor which prevents substrate binding and subsequent metabolism. Simultaneously, it binds allosterically to the active site of the AMPK enzyme, inducing a conformational change that increases AMPK phosphorylation. This dual action mediates the compound's effects within these pathways, resulting in the stabilization of downstream inflammatory markers. Furthermore, Fenazol 5% lowers the activation threshold of the NF-kappa B pathway by inhibiting Ikappa B degradation. The resulting molecular cascade leads to the blockade of the NLRP3 inflammasome, thereby altering cellular function. This mechanism modulates NLRP3 signaling via allosteric binding and limits off-target activity.

Dosage and Administration Information

How Fenazol 5% is Used

Fenazol 5% is an external preparation containing the Nonsteroidal Anti-inflammatory Drug (NSAID) Flufenamic Acid, and is officially approved for topical administration to the skin. The medication is formatted as a gel or cream in a 5% weight/weight concentration.

The established adult dosing regimen specifies applying a strip of the preparation that measures approximately 5 to 10 centimeters in length, with the applied amount adjusted based on the specific surface area requiring attention. This dose is scheduled for application up to four times daily.


Administration Protocol and Time Constraints

The procedural structure requires the preparation to be rubbed in gently and thoroughly into the affected site. Following the application process, hands must be thoroughly washed. A key administrative constraint is that Fenazol 5% must not be applied simultaneously to the same site with any other topical medicine.

Usage is defined as short-term; the total course duration must not exceed six weeks. The label further requires that the necessity for continued application be assessed after the first 14 days of use for soft tissue symptoms, or after 4 weeks for arthritis-related conditions. The regimen is established for adults, including older adults, and is not recommended for infants or children.

Recent Clinical Evidence

Research evidence / Overview of studies for Fenazol 5%


Evidence for Use in Acute Musculoskeletal Pain

Fenazol 5% contains an active ingredient from a class of medications called topical nonsteroidal anti-inflammatory drugs (NSAIDs). Research exploring this class for acute symptoms primarily relies on short-term randomized controlled trials (RCTs). These studies were used in research exploring how symptoms change over time by comparing the topical medication against an inactive cream (placebo) in people with conditions associated with acute or disruptive episodes, such as sprains, strains, and overuse injuries. Research examined outcomes related to physical discomfort, including patient-reported outcomes describing perceived discomfort and measurements of change in swelling and tenderness at the injury site.

Findings describe patterns observed in the studies related to measurements of change in patient-reported pain during the observed populations' short follow-up period (typically the initial seven days of observation). The research landscape for this type of condition is extensively studied across the topical NSAID class, though the availability of extensive, high-level evidence specifically for Flufenamic Acid forms a smaller component of the broader research pool. Follow-up durations were limited, meaning the studies provide limited data available for outcomes beyond the first week of observation.


Evidence for Use in Chronic Joint and Musculoskeletal Conditions

Studies also explored the use of this topical NSAID class for conditions characterized by fluctuating manifestations, such as chronic localized joint pain, primarily osteoarthritis. This research was evaluated in intermediate-term RCTs that evaluated patient symptoms over periods typically ranging from six to twelve weeks. Research examined outcomes reflecting daily functioning or activity level, including measures of pain, stiffness, and overall joint function scores reported by patients.

Findings describe patterns in the measured outcomes related to pain and function. However, the evidence base is primarily derived from research on knee osteoarthritis, and data for certain groups with other chronic joint issues are limited. Long-term effects are not fully established, as trials typically ended after three months; therefore, the patterns of measured outcomes over many months or years are not fully established.

Frequently Asked Questions (FAQ)

Common questions about Fenazol 5% (FAQ)


Q: How quickly does Fenazol 5% start working for pain relief?

Official clinical studies for this class of topical medication typically focus on short-term outcomes, assessing changes in patient-reported pain relief within the initial seven days of observation. The specific time to the onset of action is not explicitly defined in the official product information.


Q: How should I store the Fenazol 5% product?

According to official regulatory documents, the product should be stored below 25 C and must not be refrigerated or frozen. The product should be kept tightly closed in its original package and protected from both light and moisture to help maintain its quality.


Q: Does Fenazol 5% have any known systemic effects on the body?

While Fenazol 5% is a topical product and systemic absorption is generally low, the preparation carries warnings for serious risks associated with the NSAID class of medicines. These potential risks include serious Cardiovascular Thrombotic Events (e.g., heart attack, stroke) and serious Gastrointestinal Adverse Events (e.g., bleeding, ulceration), as documented in the official safety profile for NSAIDs.


Q: What happens if I accidentally swallow a small amount of Fenazol 5%?

Fenazol 5% is intended strictly for external use on the skin. In the event of accidental ingestion, it is advised to promptly contact a poison control center or seek emergency medical attention. Since this medicine is for external use only, accidental ingestion carries the potential for systemic effects.


Q: Can I use Fenazol 5% on open cuts or wounds?

No, official regulatory information specifically states that the preparation should not be applied to non-intact, broken, irritated, or infected skin. The official documentation emphasizes that the preparation is intended for application to intact skin.

How should Fenazol 5% be stored and disposed of?

Storage and Disposal Requirements

Official regulatory guidelines for Fenazol 5% (Flufenamic Acid topical) define specific conditions for storage and handling to ensure product quality and safety.

Condition Requirement
Temperature Store below 25°C. Do not refrigerate or freeze the product.
Protection Keep in the original package, tightly closed, and protect from light and moisture.
Child Safety Keep the medicine out of the sight and reach of children.
Stability Limit Discard any unused product 6 months after the date of first opening.
Disposal Rule Do not throw away medicines via wastewater or household waste.

All unused or expired medicinal product must be disposed of in accordance with local regulations for pharmaceutical waste. Following these instructions is necessary to maintain the integrity of the topical formulation and prevent environmental contamination.

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

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