Relaxyl

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

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 Relaxyl

Quick Facts

Property Description
Active ingredient Diclofenac (Sodium/Potassium)
Primary Form Tablets (Oral), Gel (Topical)
Pharmacological Class Nonsteroidal Anti-inflammatory Drug (NSAID)
General Purpose Pain relief, Inflammation reduction
Origin Synthetic (Phenylacetic Acid derivative)

What Type of Medicine is Relaxyl and How Does it Work?

Relaxyl is a trade name for a pharmaceutical product whose primary active ingredient, Diclofenac, is formally classified as a potent Nonsteroidal Anti-inflammatory Drug (NSAID). This places it in the pharmacological class of Non-Opioid Analgesics.

The fundamental purpose of this medication is to relieve pain and reduce inflammation. Diclofenac achieves this by inhibiting the synthesis of prostaglandins—chemical messengers in the body that trigger the pain and inflammatory response. The drug entity is synthetic, belonging to the phenylacetic acid chemical group. The general benefit is to address and ease symptoms related to inflammation, swelling, and pain by targeting the underlying chemical pathway, making it a recognized choice for managing acute discomfort.

Forms, Composition, and Administration Type

The core composition of formulations under the Relaxyl name utilizes Diclofenac (often as the sodium or potassium salt) as the active ingredient. The product is available in several dosage forms and delivery types, including solid oral forms, such as tablets (with specialized Sustained-Release options), which are intended for oral administration.

Alternatively, it is available in topical semi-solid forms, like a gel or ointment, for localized topical administration to the skin. In these topical preparations, the Diclofenac is carried in an aqueous gel or similar base. The product exists as both a single-ingredient drug and, in some cases, as a combination product that integrates additional active ingredients. This variety in form is a key feature, offering either systemic or localized relief depending on the required therapeutic profile.

Regulatory References

  1. Diclofenac: MedlinePlus Drug Information
  2. Diclofenac - StatPearls - NCBI Bookshelf - NIH

What side effects are possible with Relaxyl?

Possible Side Effects and Safety Information

Relaxyl (a hypothetical non-steroidal anti-inflammatory drug or NSAID) carries serious documented safety risks that require consideration.

Serious and Clinically Significant Adverse Reactions

The most serious safety concerns are the increased risk of major cardiovascular thrombotic events (such as heart attack and stroke), and serious gastrointestinal adverse events (including bleeding, ulceration, and perforation of the stomach or intestines), all of which can be fatal. These serious events may occur at any time during use and may be increased with higher doses or longer duration of treatment. The drug may also cause or worsen kidney and liver function changes, particularly with long-term exposure.

Common Adverse Reactions

Adverse reactions that occur frequently in patients include disturbances of the gastrointestinal system (such as nausea, vomiting, diarrhea, indigestion, and abdominal pain) and the nervous system (including headache, dizziness, and drowsiness). For topical formulations, common reactions involve the skin, such as local irritation, redness, itching, and a burning sensation.

Safety Restrictions and Contraindications

  • Cardiovascular: Contraindicated for use in the setting of coronary artery bypass graft (CABG) surgery.
  • Pregnancy: Contraindicated in the third trimester of pregnancy due to the potential for harm to the fetus (e.g., heart problems and renal dysfunction).
  • General: Caution is required in patients with pre-existing conditions like kidney or liver impairment, high blood pressure, and a history of ulcers or bleeding. Patients on long-term treatment may require periodic monitoring of their organ function.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory information describes overdose primarily through the manifestation of systemic effects, as there is no specific antidote known for Diclofenac overdose. The management approach is symptomatic and supportive, and may include procedures such as gastric lavage or the use of activated charcoal if the ingestion was recent.

Classification Detail Official Regulatory Statement
Documented Manifestations Symptoms may include nausea, vomiting (potentially with blood), diarrhea, epigastric pain, headache, drowsiness, and tinnitus. Effects on the cardiovascular system, such as high or low blood pressure, have also been reported.
Severe Outcomes Large overdoses can be harmful to adults and children, resulting in rare but severe outcomes such as seizures, coma, acute renal failure, or respiratory depression. Gastrointestinal bleeding is a significant risk.
Emergency Action Required Seek medical help right away upon any suspicion of overdose. Contact emergency services immediately for signs of severe systemic toxicity, including loss of consciousness or difficulty breathing. Healthcare providers are expected to monitor vital signs and conduct blood and urine tests.
Topical Overdose Note Overdose is highly unlikely from topical use due to low systemic absorption. However, accidental ingestion of the gel may lead to systemic effects similar to those of oral overdose.

The overall regulatory profile emphasizes that while a mild overdose may be generally benign, the potential for severe or life-threatening systemic toxicity mandates immediate professional medical consultation for definitive clinical management and observation.

Therapeutic Uses of Relaxyl

Relaxyl (Diclofenac) is applied across therapeutic domains for its role in managing symptoms related to inflammatory or irritative states. It is relevant in contexts where additional symptomatic support is needed, providing support that helps ease the overall symptom load.

Managing Chronic Joint Discomfort

The medication is commonly used to help manage the persistent pain and inflammatory symptoms associated with chronic joint conditions such as Osteoarthritis, Rheumatoid Arthritis, and Ankylosing Spondylitis. It contributes to improved day-to-day comfort and assists with maintaining functional stability during symptomatic periods.

Support for Acute and Episodic Pain

Relaxyl is relevant for managing symptoms associated with acute events, including pain and swelling from sprains, strains, postoperative discomfort, migraine attacks, and primary dysmenorrhea (menstrual cramps). It is applied in situations where short-term symptomatic assistance is needed, assisting with maintaining a sense of stability when symptoms are more noticeable.


Quick Fact: Support for Symptoms Related to Physical Discomfort

Regulatory References

  1. NIH MedlinePlus overview of Diclofenac

Eligibility and Restrictions for Use

This section summarizes the official population-eligibility rules for Diclofenac (Relaxyl) as defined in government regulatory documents.

Populations Who Must Not Use Relaxyl (Contraindications)

Category Contraindication
Hypersensitivity Known allergy to Diclofenac or any history of asthma, hives, or allergic reactions after taking Aspirin or other NSAIDs (e.g., Aspirin-sensitive asthma).
Cardiovascular/Surgery Pain treatment related to Coronary Artery Bypass Graft (CABG) surgery. Systemic forms are contraindicated in patients with established Congestive Heart Failure (NYHA Class II–IV), Ischaemic Heart Disease, or Cerebrovascular Disease.
Gastrointestinal Active Gastrointestinal (GI) bleeding, ulceration, or perforation.
Pregnancy Starting at 30 weeks gestation and later.

Populations Requiring Restricted or Conditional Use

Age-Related Eligibility

  • Children and Adolescents: Safety and efficacy for many oral forms are not established for children under 12 years of age.
  • Elderly: Use is permitted but requires caution due to a higher risk of serious GI and renal adverse events.

Condition-Specific Limitations

  • Renal Function: Avoid use in advanced renal disease unless the benefit outweighs the risk of worsening function.
  • Hepatic Function: Discontinue immediately if abnormal liver tests persist or worsen.
  • Pregnancy (20–30 Weeks): Use should be limited to the lowest effective dose for the shortest duration (risk of fetal renal dysfunction).

What should I know about interactions with other medicines?

The official interaction profile of Relaxyl (Diclofenac) is defined by regulatory classification across pharmacodynamic risk enhancement and pharmacokinetic exposure alteration.

Interaction-Related Restrictions

Co-administration is formally contraindicated for the treatment of peri-operative pain in the setting of Coronary Artery Bypass Graft (CABG) surgery. It is also prohibited with other Systemic Nonsteroidal Anti-inflammatory Drugs (NSAIDs) and analgesic doses of Aspirin due to the documented increase in serious gastrointestinal event risk.

Pharmacodynamic Risk Enhancement

Co-administration with Anticoagulants (e.g., Warfarin), Antiplatelet agents, SSRIs/SNRIs, and systemic Corticosteroids is documented to increase the risk of serious bleeding or gastrointestinal ulceration. Combining it with Diuretics, ACE Inhibitors, or Angiotensin Receptor Blockers (ARBs) may diminish their desired effects and carries a documented risk of renal function deterioration. This risk is specifically noted as heightened in the elderly or those with pre-existing renal impairment.

Exposure Alteration

The drug formally reduces the renal clearance of Methotrexate and impairs the renal excretion of Lithium, both of which lead to increased plasma concentrations of the co-administered agents. The strong CYP inhibitor Voriconazole is documented to increase the systemic exposure ( C max and AUC) of Diclofenac. Administration of oral forms with food is noted to delay the time to reach maximum plasma concentrations, and consumption of alcohol increases the documented risk of serious gastrointestinal adverse events.

Mechanism of Action

Molecular Mechanism of Action

Relaxyl's mechanism is defined by its reversible, non-selective inhibition of the Cyclooxygenase ( COX-1 and COX-2) enzymes. This molecular action involves the drug binding to the active site of these enzymes, thereby preventing the conversion of Arachidonic acid into Prostaglandin precursors.

Downstream Physiological Consequences

By blocking COX activity, the mechanism drastically reduces the synthesis of Prostaglandins ( PGE2) at the site of action. The reduction of these inflammatory mediators affects two key physiological systems: Peripheral Modulation and Central Thermoregulation.

In the periphery, this mechanism results in the desensitization of nociceptors and the limitation of Prostaglandin-driven fluid extravasation in the affected tissues. Centrally, the inhibition of PGE2 synthesis in the hypothalamus interferes with central signaling, resetting the temperature set-point and resulting in the physiological adjustment of the thermal mechanism.

Dosage and Administration Information

How to Use Relaxyl

Relaxyl, the trade name for Diclofenac, is administered via several established routes, including oral (tablets, capsules, and powder for solution), topical (gel), intramuscular (IM), and intravenous (IV) injection. The foundational principle for administration is to utilize the lowest effective dose for the shortest possible duration, consistent with product labeling.


Official Dosing and Administration Patterns

Usage Aspect Administration Guideline
Standard Oral Dose For chronic conditions like Osteoarthritis, the typical dose is 100 to 150 mg daily, administered in divided doses (e.g., two to three times per day).
Extended-Release Form Extended-release tablets (e.g., 100 mg) are typically dosed once daily for maintenance therapy.
Topical Administration The topical gel (1%) is generally applied four times daily to the affected joint, requiring the use of a supplied dosing card for accurate measurement.
Timing Relative to Meals Oral delayed-release tablets should be taken with liquid, preferably before meals. In contrast, oral powder-for-solution is mixed with water and consumed on an empty stomach.
Special Handling Enteric-coated and extended-release tablets must be swallowed whole without crushing or chewing to maintain the intended release profile.

Population and Procedural Rules

Procedural rules mandate that different oral formulations are not interchangeable even at the same milligram strength. For older adults, clinical guidance requires initiating treatment with the lowest effective dosage. For missed doses, the instruction is to skip the missed dose and continue with the next scheduled time; doubling the next dose is not a standard procedure. These labeled instructions define the standardized, procedural approach to using the medicine.

Recent Clinical Evidence

Relaxyl: Recent Clinical Evidence


Evidence for use in Pain and Inflammation Associated with Osteoarthritis

Research for this condition has focused primarily on short-term Randomized Controlled Trials (RCTs), which were applied in studies examining patient-reported experiences of physical discomfort and outcomes reflecting daily functioning. The studies monitored outcomes related to daily functioning, such as the measurements of specific pain and function scores, over defined time intervals. The studies reported measurements of changes in pain intensity scores when comparing the Relaxyl group to the comparison groups (such as placebo or other medicines).

What remains uncertain is the long-term characterization of the outcomes beyond one year, as follow-up durations were limited in most initial trials. Data are still emerging, and certainty remains low regarding the patterns observed in functional measurements over many years.

Evidence for use in Pain and Stiffness Associated with Rheumatoid Arthritis

For Rheumatyl, short-to-intermediate-term RCTs, typically lasting three to six months, were evaluated in research exploring outcomes related to systemic or functional imbalance. Research examined the use of composite scores and functional status questionnaires as measured outcomes. The studies reported the percentage of patients in the Relaxyl group achieving specific predefined response criteria at intermediate time points. Some trials also described measurements of radiographic progression (joint damage), which was observed in some studies over periods up to one or two years.

What remains uncertain is the full picture of long-term outcomes. The data related to the durability of the reported changes over an extended period of time are still emerging. Comparative evidence is lacking for direct comparisons against all alternative treatments in the broader evidence landscape.

What is Still Uncertain About Relaxyl

The research highlights what is known and what is still uncertain about Relaxyl. The main evidence gaps include the limited data on long-term outcomes, as follow-up durations were limited in the initial registration trials. Findings were mixed or inconsistent in some specific subgroups, meaning that certainty remains low in those patient populations. Data are still emerging for specific clinical scenarios and for many special populations.

Key Studies & References

  1. Spondyloarthritis in over 16s: diagnosis and management (NICE Guideline NG65)

Frequently Asked Questions (FAQ)

Common questions about Relaxyl (FAQ)

Q: What is the main reason doctors prescribe Relaxyl?

Regulatory documents list Relaxyl's approved use for treating symptoms of pain and inflammation. This includes its use in managing chronic conditions like osteoarthritis and rheumatoid arthritis. It is also indicated for reducing inflammation associated with conditions such as ankylosing spondylitis and acute migraine attacks.

Q: Is Relaxyl a type of pain reliever or something else?

Relaxyl is officially classified as a Nonsteroidal Anti-inflammatory Drug (NSAID). Its classification indicates that it possesses multiple properties, including analgesic (pain-relieving) and anti-inflammatory effects. Official product information also notes that it has antipyretic (fever-reducing) properties.

Q: How quickly does Relaxyl usually start working?

Studies have examined the drug's onset of action for acute pain. Clinical trial data suggests that confirmed perceptible pain relief may begin in under 30 minutes after taking certain fast-acting formulations of the medication.

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

The terminal half-life of the unchanged drug is described in official pharmacokinetic studies as approximately 2 hours. This suggests that the duration of activity can range from four to six hours, depending on the specific formulation.

Q: What are the most common side effects reported for Relaxyl?

Clinical trial data indicates that the most frequently reported side effects involve the gastrointestinal system. These common events include abdominal pain, diarrhea, and indigestion (dyspepsia). Other common events noted in the official prescribing information are headache, dizziness, and ringing in the ears (tinnitus).

Q: Is it normal to feel a bit sleepy when starting Relaxyl?

Official prescribing information includes drowsiness and dizziness among the reported adverse experiences. These central nervous system (CNS) effects are described in the regulatory documents as potential effects related to the drug's use.

Q: Are there any specific foods or drinks to avoid while taking Relaxyl?

Regulatory documents note that the powder-for-solution form of the drug is best taken on an empty stomach because food may reduce how well it is absorbed. Furthermore, the consumption of alcohol is formally documented to increase the risk of serious gastrointestinal adverse events. For most tablet and capsule forms, there are generally no known interactions with other common foods or drinks.

Q: Can I take Relaxyl if I have kidney problems?

Official labeling states that use is discouraged (contraindicated) for individuals with severe kidney disease (renal impairment). For those with mild to moderate kidney dysfunction, the documents indicate that dosage adjustment of the unchanged drug is typically not required. However, close caution and monitoring of kidney function are still advised.

Q: What if Relaxyl doesn't seem to be working for me?

Official patient information advises that if symptoms persist or do not show improvement within the recommended period of treatment, it is important to seek medical advice. Regulatory warnings prioritize medical evaluation if the desired effects are not achieved.

Q: How should I stop taking Relaxyl if necessary?

Official patient labeling does not contain instructions for self-discontinuation of the medicine. The drug guide only provides a directive to stop taking the medicine and seek immediate medical help if signs of a serious side effect occur. Regulatory documents emphasize that any decision to stop or change the treatment regimen requires guidance from a healthcare professional.

Q: Does Relaxyl affect blood pressure?

Official warnings state that high blood pressure (hypertension) is a potential adverse event that can occur with the use of NSAIDs, including Relaxyl. For this reason, official guidance notes that blood pressure monitoring may be recommended during the course of therapy.

Q: Is Relaxyl considered safe for long-term use?

Regulatory documents advise caution regarding the long-term use of this medication. Official warnings indicate that the risks of serious side effects, including cardiovascular and gastrointestinal events, may increase with higher doses and extended duration of therapy.

Q: Is Relaxyl a controlled substance?

Relaxyl is officially classified as a Nonsteroidal Anti-inflammatory Drug (NSAID). According to U.S. federal regulation, this medicine is not listed or classified as a controlled substance.

Q: Are there generic versions of Relaxyl available?

Yes, the active ingredient in Relaxyl is widely available. Regulatory status shows that lower-cost generic versions of this medicine are available in the market.

Q: Does taking Relaxyl cause weight gain?

Official documentation lists “weight changes” as a potential adverse experience related to the drug's use. Furthermore, unexplained weight gain or swelling is specifically listed in the patient warnings as a symptom that requires immediate medical attention.

Q: What kind of studies have been done on Relaxyl?

The official labels are supported by research evidence from large, controlled clinical trials. These studies have primarily examined the drug's safety and effects in patient populations with conditions such as osteoarthritis, rheumatoid arthritis, and acute pain.

Q: Where can I find the official prescribing information for Relaxyl?

Official prescribing information is intended to be publicly available and accessible. These official documents can typically be found on the websites of government drug regulatory agencies, such as the U.S. Food and Drug Administration (FDA) and the National Institutes of Health (NIH) MedlinePlus.

Q: Is there a maximum amount of time Relaxyl can be used?

Regulatory guidance emphasizes that the medication should be used for the shortest duration possible at the lowest effective dose. For over-the-counter formulations, specific time limits (such as three or five days) may be recommended on the packaging.

Q: Do children ever use Relaxyl?

The official dosing information for certain formulations of the drug includes information for pediatric populations. However, the regulatory guidance strictly states that use and dosage for children must be determined and managed by a healthcare provider.

Q: What does 'contraindication' mean in relation to Relaxyl?

In the context of official drug labeling, a contraindication is a specific condition, circumstance, or prior event that formally discourages or prohibits the use of the drug. Taking the medicine when a contraindication is present may lead to serious harm or reduced safety.

Q: Is Relaxyl safe to take before driving?

The official label lists drowsiness and dizziness as potential side effects. Official product information suggests that patients should exercise caution when operating complex machinery or driving.

Q: Can people with liver issues use Relaxyl?

The medication is formally contraindicated (discouraged) for patients who have severe hepatic impairment (liver failure). Official warnings note that close medical surveillance may be required for patients with impaired liver function during treatment.

Q: What is the recommended storage temperature for Relaxyl?

Regulatory documents generally recommend storing this medicine at room temperature. This range is typically defined as between 68 F to 77 F (20 C to 25 C). Patients should consult the specific product packaging for exact storage instructions and keep the medicine away from heat and moisture.

Q: Are allergic reactions to Relaxyl common?

Official warnings note that allergic reactions can occur with this medication, including serious events like anaphylactic/anaphylactoid reactions. The drug is formally contraindicated in patients who have a known hypersensitivity to the drug or other NSAIDs.

Q: Can I take Relaxyl if I am pregnant or breastfeeding?

The use of Relaxyl is formally contraindicated in the third trimester of pregnancy due to documented risks to the fetus. While tiny amounts of the drug pass into breast milk, official information states that it has been used by breastfeeding patients. Regulatory guidance emphasizes the need for consultation with a healthcare provider for patients who are pregnant or breastfeeding.

Q: What are the rare but serious side effects of Relaxyl?

The official Boxed Warning and safety information highlight the risk of serious but rare adverse events. These include the risk of cardiovascular thrombotic events (such as heart attack or stroke) and serious gastrointestinal bleeding or ulceration. Severe skin reactions and liver problems are also listed as serious potential risks.

Q: Are there certain medical conditions that mean I shouldn't use Relaxyl?

Yes, the official label lists several conditions that contraindicate the use of Relaxyl. These include a history of active gastric or intestinal ulceration or bleeding, severe cardiac failure, and severe impairment of kidney or liver function. It is also prohibited during the perioperative period of coronary artery bypass graft (CABG) surgery.

Q: Why is Relaxyl not recommended for certain age groups?

Official documentation notes that the risk of certain serious side effects, particularly gastrointestinal bleeding, increases with older age. For pediatric populations, the regulatory label requires a healthcare provider to determine the appropriate use and dosage.

Q: What types of drug interactions are most concerning for Relaxyl?

Regulatory documents indicate two types of interactions are particularly concerning. One type significantly increases the risk of serious bleeding or gastrointestinal ulceration, such as with blood thinners. The other type may lead to the deterioration of kidney function, often when taken with certain blood pressure medications.

Q: Are there any specific precautions for people with heart conditions using Relaxyl?

The medication is formally contraindicated for patients with established heart and circulation conditions. This includes ischemic heart disease, peripheral arterial disease, cerebrovascular disease, and certain classifications of congestive heart failure. These contraindications are listed in the official warnings due to documented cardiovascular risks.

Q: What if I take too much Relaxyl?

Overdose symptoms reported in official documents may include gastrointestinal signs such as nausea, vomiting, and stomach pain, potentially with signs of bleeding. Central nervous system effects such as drowsiness and, in severe cases, loss of consciousness have also been reported.

Q: What is the primary way Relaxyl is eliminated from the body?

According to official pharmacokinetic studies, Relaxyl is eliminated primarily through metabolism in the liver. This process transforms the drug into metabolites, which are then excreted from the body via both the urine and the bile.

Q: Does Relaxyl have a 'boxed warning' or 'black box warning' ?

Yes, the oral tablet forms of this medication carry an official FDA Boxed Warning (also known as a Black Box Warning). This is the strongest type of warning required by the FDA. The warning highlights the risk of serious cardiovascular thrombotic events and serious gastrointestinal adverse events.

Q: Is it true that Relaxyl helps with sleep?

Official documentation reports effects on the central nervous system (CNS). The adverse experiences reported include both drowsiness and insomnia. The drug is not officially indicated or described as a treatment to help with sleep.

Q: What kind of monitoring is typically recommended while on Relaxyl?

Official guidance notes that close medical surveillance may be advised for patients with impaired liver function. Additionally, monitoring of liver enzymes and blood pressure may be recommended during the course of therapy.

Q: Does Relaxyl contain any common allergens like gluten or lactose?

The official inactive ingredients list for certain tablet formulations includes lactose monohydrate. Additionally, the powder-for-solution form contains aspartame, which is a source of phenylalanine. Patients with specific allergies or conditions, such as phenylketonuria, should review the ingredient list for their specific formulation.

Q: Is the long-term safety data for Relaxyl available?

The official labels are informed by data from studies that characterize the risk profile of the medication. This data is used to inform the warning that the risk of serious cardiovascular and gastrointestinal adverse events increases with the long-term use of the medication.

Q: What should I do if I experience a strange side effect from Relaxyl?

If serious symptoms, such as chest pain, difficulty breathing, or unexplained swelling of the face or body, occur, the official instruction is to immediately stop the medicine and seek emergency medical help. For non-emergency side effects, consultation with a healthcare provider is noted.

Q: Can Relaxyl affect fertility?

Official information advises that Nonsteroidal Anti-inflammatory Drugs (NSAIDs) may be associated with a reversible delay in ovulation for females who desire pregnancy. This potential effect is noted in the regulatory documents concerning fertility.

How should Relaxyl be stored and disposed of?

How to Store and Dispose of Relaxyl

Official regulatory requirements define the proper storage and disposal of Relaxyl (Diclofenac) formulations to ensure stability and safety.


Storage Requirements

Relaxyl products must be stored in a cool and dry place, often within the 20 C to 25 C range, and must be protected from light. The container must be kept tightly sealed and in its original receptacle. Topical forms have the specific instruction Do not freeze. Stability constraints include using opened gels within a specific timeframe, such as 28 days.

Disposal and Safety

The medicine must be stored out of the reach of children and pets. Unused or expired product must be discarded properly in accordance with local regulations, and it is explicitly prohibited to dispose of the product by flushing it down the toilet or drain. This prevents environmental contamination.

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

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