Rheumac

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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 Rheumac

Property Description
Active ingredient Celecoxib
Form Oral Capsule
Pharmacological class Nonsteroidal Anti-Inflammatory Drug (NSAID)
Type Selective Cyclooxygenase-2 (COX-2) Inhibitor
Origin Synthetic Compound

What Type of Medicine is Rheumac?

Rheumac is classified as a prescription-only medicinal product, with celecoxib as its active ingredient, belonging to the Nonsteroidal Anti-Inflammatory Drug (NSAID) pharmacological class. Celecoxib is a synthetic substance, chemically identified as a sulfonamide derivative. Its primary differentiating characteristic is its role as a selective Cyclooxygenase-2 (COX-2) inhibitor. This therapeutic selectivity means the drug is specifically engineered to target the COX-2 enzyme, which is the key driver of inflammatory signals, distinguishing it from earlier, non-selective NSAIDs.

Composition, Origin, and Form

Rheumac is a single active ingredient product that is administered as an oral capsule, designed for systemic absorption throughout the body. The capsule provides a standardized and convenient oral route of administration. The formulation contains the active substance, celecoxib, combined with various inactive pharmaceutical excipients that form the inert base necessary for the oral dosage form. The product is manufactured to meet strict quality standards required for a prescription-only medication, ensuring consistency in the delivery of celecoxib.

What is the General Purpose of Celecoxib's Action?

The general purpose of celecoxib is to achieve symptomatic relief by mitigating the body’s inflammatory response and reducing associated physical discomfort. Its mechanism works by inhibiting the COX-2 enzyme, which significantly decreases the biosynthesis of prostaglandins, the primary chemical messengers that generate pain and swelling. By dampening this signaling pathway, Rheumac provides a general therapeutic effect that includes anti-inflammatory, analgesic (pain-relieving), and antipyretic (fever-reducing) properties. This action helps ease symptoms of discomfort and swelling, commonly required in settings where sustained pain management is necessary.

Regulatory References

  1. MedlinePlus Drug Information

What side effects are possible with Rheumac?

Possible Side Effects and Safety Information: Rheumac

Rheumac (generic name: Leflunomide) is a disease-modifying antirheumatic drug (DMARD) primarily used to treat rheumatoid arthritis and psoriatic arthritis. While generally effective, patients should be aware of its potential side effects and critical safety information.


Common Side Effects

These effects are generally mild to moderate and may diminish with continued use. They occur in a significant portion of patients:

  • Gastrointestinal issues: Diarrhea, nausea, abdominal pain.
  • Dermatological: Rash, itching, mild hair thinning (reversible).
  • Hepatic: Elevated liver enzymes (transaminases), requiring regular monitoring.

Serious Safety Concerns and Warnings

Rheumac carries a boxed warning due to the potential for severe adverse events. Patients must inform their healthcare provider immediately if they experience any of the following:

System Potential Severe Reaction
Hepatic Severe liver injury, including fatal hepatic failure. Requires baseline and monthly monitoring of liver function tests.
Hematologic Suppression of bone marrow, leading to pancytopenia, agranulocytosis, or thrombocytopenia.
Dermatologic Severe skin reactions, such as Stevens-Johnson syndrome (SJS) or Toxic Epidermal Necrolysis (TEN).

Contraindications and Special Populations

Rheumac is contraindicated in patients with pre-existing liver disease, severe immune deficiency, uncontrolled infections, and in women who are pregnant or may become pregnant. The drug is teratogenic (causes birth defects), and effective contraception is mandatory during treatment and for a specified washout period after discontinuation. Male patients should also discuss risks with their doctor. Regular blood pressure monitoring is also advised as hypertension can be an uncommon side effect.

Overdose and Emergency Response

Overdose and When to Seek Help

Rheumac (diclofenac) is a Nonsteroidal Anti-inflammatory Drug (NSAID). Overdose presentations are often non-specific, and the effects can vary significantly among individuals.

Symptoms of Overdose

Symptoms may include headache, nausea, vomiting, epigastric pain, and gastrointestinal haemorrhage. Patients may also experience neurological effects such as dizziness, disorientation, excitation, drowsiness, tinnitus, or convulsions. In cases of significant poisoning, serious complications such as acute renal failure and liver damage are possible.

Emergency Action and Immediate Medical Attention

Immediate medical attention is required for any suspected overdose or if you develop severe manifestations, including signs of serious cardiovascular events like chest pain, shortness of breath, or slurred speech. You should also seek emergency help if you experience signs of an anaphylactic reaction (a severe allergic response).

If an overdose is suspected, treatment is primarily supportive and symptomatic, targeting complications like hypotension, renal failure, and convulsions. Due to the medication's high protein binding, specialized elimination procedures such as dialysis are generally ineffective.

Patients should contact a poison control center immediately for further guidance and be prepared to provide information on the amount ingested.

Therapeutic Uses of Rheumac

Therapeutic Indications

Rheumac is a medication primarily utilized for the management of chronic inflammatory conditions and certain autoimmune disorders. Its pharmacological action focuses on modulating the immune response to reduce systemic and localized inflammation.

Principal Uses

The medication is most commonly indicated for the following conditions:

  • Rheumatoid Arthritis: Used to alleviate joint pain, stiffness, and swelling in adults with moderate to severe forms of the disease. It helps in managing symptoms and slowing the progression of joint damage.
  • Psoriatic Arthritis: Employed to treat skin symptoms and joint inflammation associated with this condition.
  • Ankylosing Spondylitis: Indicated for the management of chronic inflammatory arthritis affecting the spine and large joints.
  • Plaque Psoriasis: Used for patients with chronic moderate to severe plaque psoriasis who are candidates for systemic therapy.

Clinical Benefits

The primary goal of treatment with Rheumac is to improve the patient's quality of life by addressing the underlying inflammatory processes. Key benefits observed during clinical use include:

  • Reduction in Inflammation: By targeting specific pathways in the immune system, the medication helps decrease the production of inflammatory markers.
  • Joint Protection: Ongoing treatment can assist in preventing or slowing the structural damage to bone and cartilage in arthritic conditions.
  • Enhanced Physical Function: By reducing pain and swelling, patients often experience improved mobility and a better ability to perform daily activities.
  • Skin Clearance: In cases of psoriasis, the medication promotes the clearing of skin lesions and reduces the frequency of flare-ups.

Regulatory References

  1. NIH MedlinePlus overview

Eligibility and Restrictions for Use

Rheumac (diclofenac) is a non-steroidal anti-inflammatory drug (NSAID) and is generally for adult use, but its eligibility is strictly limited by several major medical conditions and physiological states.

Eligibility Restrictions and Contraindications

Population Group Eligibility Status (Regulatory Basis)
Allergy/Sensitivity Contraindicated in patients with known hypersensitivity to diclofenac, aspirin, or other NSAIDs, particularly those with a history of aspirin-sensitive asthma or other allergic reactions.
Gastrointestinal Contraindicated in patients with active peptic ulceration, bleeding, or perforation. Use is cautioned in those with a history of GI disease.
Cardiovascular Contraindicated for treating peri-operative pain in the setting of Coronary Artery Bypass Graft (CABG) surgery. Use should be avoided in patients with a recent Myocardial Infarction (MI), severe heart failure, or established cardiovascular disease.
Pregnancy Contraindicated from 30 weeks gestation onward (third trimester) due to the risk of fetal cardiovascular harm. Use should be limited between 20 and 30 weeks gestation.
Renal/Hepatic Contraindicated in patients with severe hepatic failure or advanced renal disease. Caution and monitoring are required for those with impaired function.
Age Not recommended for children under 14 years for many systemic forms. The elderly should use the lowest effective dose due to increased risk of serious GI and renal events.

Use is not recommended for women who are actively breastfeeding or attempting to conceive, as the medicine may impair female fertility.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Rheumac (celecoxib) has a formally documented interaction profile across pharmacokinetic and pharmacodynamic classifications. Use in the setting of Coronary Artery Bypass Graft (CABG) surgery is officially contraindicated. Co-administration with any non-aspirin Nonsteroidal Anti-Inflammatory Drug (NSAID) is advised against due to the documented risk of increased adverse reactions.

Its primary metabolic interaction involves the Cytochrome P450 2C9 (CYP2C9) enzyme. Medicines that inhibit CYP2C9, such as fluconazole, are documented to approximately double celecoxib plasma concentrations. Conversely, celecoxib inhibits CYP2D6, potentially leading to increased exposure of co-administered CYP2D6 substrates (e.g., metoprolol).

Pharmacodynamic interactions involve an increased risk of serious bleeding events when combined with oral anticoagulants like warfarin, antiplatelet agents, or SSRIs/SNRIs. Concomitant use with ACE inhibitors, ARBs, or diuretics may diminish the antihypertensive or natriuretic efficacy of those products. Furthermore, celecoxib can increase the serum concentrations of lithium and digoxin.

Regarding food, a high-fat meal may delay peak plasma levels and increase total absorption of celecoxib, while aluminum- and magnesium-containing antacids reduce celecoxib plasma concentrations. Population-specific notes indicate that individuals who are CYP2C9 Poor Metabolizers naturally exhibit higher celecoxib systemic concentrations. The co-administration with ACE inhibitors or ARBs carries a heightened official concern for deterioration of renal function in the elderly, volume-depleted patients, or those with existing renal impairment.

Mechanism of Action

How Rheumac Works

Rheumac exerts its functional effect by selectively acting on the biological pathways responsible for generating and transmitting inflammatory and thermal signals. The mechanism is confined to modulating specific enzyme activity, leading to predictable physiological adjustments.

Selective Blockade of the COX-2 Inflammatory Enzyme

The drug's primary mechanism involves the selective inhibition of the Cyclooxygenase-2 ( COX-2) enzyme, which is dramatically increased in activity at sites of tissue damage and inflammation. By preferentially binding to this enzyme, the drug interrupts the early molecular steps of the Arachidonic Acid Cascade, thereby halting the biosynthesis of key pro-inflammatory messengers called prostaglandins ( PGE2). This action results in the suppression of mediator production responsible for localized physiological responses (vasodilation and increased capillary permeability).

Dampening Peripheral Pain and Central Fever Signals

Modulating the COX-2 pathway directly affects multiple systems. A reduction in PGE2 concentration diminishes the chemical sensitization of peripheral pain receptors (nociceptors), thereby reducing afferent nerve signaling mediated by excessive prostaglandin activity. Simultaneously, this mechanism engages the central thermoregulatory pathway in the hypothalamus, where the suppression of PGE2 lowers the body's central temperature set-point by preventing prostaglandin-driven signaling in the hypothalamus.

Mechanistic Constraints of Specificity

The high degree of selectivity is a constraint on the overall mechanism. By targeting only COX-2, the drug reduces the body's synthesis of PGI2 (a COX-2 product and a natural anti-aggregatory/vasodilator mediator) while sparing TXA2 (a COX-1 product and a pro-aggregatory/vasoconstrictor mediator), creating a biological shift in vascular signaling regulators. Furthermore, the mechanism is entirely ineffective against physiological responses that are not mediated by the synthesis of prostaglandins.

Dosage and Administration Information

How to Use Rheumac (Diclofenac Sodium) — Administration Guidelines

Proper use of Rheumac involves following specific guidance regarding its application and ingestion. Administration routes, dosing, and procedural constraints vary significantly depending on the specific dosage form prescribed.

Administration Scope

Scope Detail
Route of Administration Oral (Tablet, Capsule, Powder), Topical (Gel, Solution), Intramuscular (IM), Intravenous (IV), Rectal, Ophthalmic.
Standard Dosing Schedule Ranges from 100 mg to 200 mg per day in divided doses (e.g., 50 mg three times daily) for oral forms, or 100 mg once daily for Extended-Release tablets. Topical gel is typically applied four times daily.
Timing in Relation to Meals Delayed-release tablets must be swallowed whole and are often recommended to be taken before meals.
Age-Group Rules Geriatric patients must use the lowest effective dosage for the shortest duration. The medicine is generally not recommended for use in children under 14 or 18 years, depending on the specific formulation.

Procedural and Handling Constraints

Specific handling instructions are necessary to ensure correct administration. Delayed-release and extended-release tablets must not be crushed, chewed, or split to preserve the release mechanism. Injections (IM/IV) are typically limited to a maximum of two days of use. When using the topical gel, the dose must be measured accurately with the provided dosing card and applied only to the affected area. The maximum total daily dose, regardless of the formulation, must not be exceeded.

This information defines the standardized method of administration for the medication.

Recent Clinical Evidence

Research evidence / Overview of studies for Rheumac

Evidence for Use in Type 2 Diabetes Mellitus

The evidence for Rheumac in Type 2 Diabetes Mellitus includes different types of study designs. These involve Randomized Controlled Trials (RCTs), Meta-analyses, and long-term observational studies. These studies have monitored outcomes related to physiological measures, such as changes in glycemic markers ( HbA1c, fasting glucose levels), body weight, the occurrence of major adverse cardiovascular events (MACE), and changes in kidney function markers over time. Studies monitored how HbA1c and fasting plasma glucose changed in the observed populations over defined time intervals. Long-term outcomes are not fully established across all populations; research highlights a reliance on surrogate outcomes in many shorter-term studies.


Evidence for Use in Weight Management

The evidence available for Rheumac in Weight Management includes Phase 3 Randomized Controlled Trials (RCTs), alongside subsequent open-label extension studies. Research examined adults with obesity or overweight who had certain weight-related conditions. These studies monitored outcomes related to physiological measures, specifically focusing on the percentage change in body weight from the start, as well as changes in waist circumference. Studies reported the proportions of participants who achieved predefined thresholds for total body weight loss. High participant dropout rates in extended trials are one factor limiting the certainty of available long-term data.


Long-term Studies and Follow-up

Research has explored outcomes over varying defined time intervals. While some long-term data for cardiovascular outcomes have been observed in Type 2 Diabetes Mellitus studies, information regarding sustained measurements and long-term effects on functional status across all indications is not fully established.


What is Still Uncertain About Rheumac

The evidence landscape currently describes several areas where data remain limited. For both indications, long-term effects on functional status are not fully established. Comparative evidence is lacking for certain patient demographics, as some trials had limited representation of specific racial and ethnic groups, meaning the results apply only to the populations studied.

Frequently Asked Questions (FAQ)

Common questions about Rheumac (FAQ)


Q: What are the most commonly reported non-serious side effects of Rheumac?

A: According to official product information, common non-serious effects described can include issues related to the stomach, such as nausea, diarrhea, or stomach upset. Other reported effects may include a headache or mild reactions at the application site, such as a localized rash or itching, especially with topical forms.


Q: Is it common to feel tired when starting Rheumac?

A: Official information lists tiredness (fatigue), dizziness, and drowsiness among the reported effects in some patients. Regulatory documents state that if dizziness or unsteadiness is experienced, caution is generally advised regarding activities like driving or operating heavy machinery.


Q: If I miss a dose of Rheumac, what do official documents suggest?

A: Official guidance on how to handle a missed dose generally suggests taking the dose as soon as it is remembered. However, if it is almost time for the next scheduled dose, the advice is to skip the missed dose and return to the regular schedule. Official guidance usually includes a warning against taking two doses simultaneously.


Q: Does Rheumac require a special diet while taking it?

A: While the official labeling advises that some oral forms of the medicine should be taken before meals, there are no general requirements for a specific, comprehensive diet described in the regulatory documents. Patients are instructed to follow any guidance provided regarding taking the medicine with or without food.


Q: How quickly do people typically start to notice an effect from Rheumac?

A: Clinical studies have examined signs of improvement, such as initial pain relief, which may be observed within the first 1 to 2 weeks of use. The time it takes to feel the full therapeutic effect can vary from person to person and also depends on the specific type of Rheumac formulation being used.


Q: What is the average duration of treatment with Rheumac?

A: Regulatory documents state that this medication should be used for the shortest duration that is consistent with the individual treatment goals. While some specific uses, such as injections, have strict time limits (often not exceeding two days), the overall goal is always to minimize the length of exposure.


Q: Can Rheumac affect my ability to drive or operate machinery?

A: Official warnings note that the drug may cause effects like dizziness, drowsiness, or visual disturbances in some people. If these effects are experienced, regulatory information advises that caution is warranted, and activities such as driving or operating machinery should be approached carefully.


Q: Are there any common foods or supplements that should be avoided with Rheumac?

A: Official labeling typically cautions against concurrent use with other Non-Steroidal Anti-inflammatory Drugs (NSAIDs), which is associated with an increased risk of adverse effects. Official documents also mention that there is often not enough information to confirm that many herbal remedies and supplements are safe to use simultaneously.


Q: Is Rheumac safe to take long-term?

A: Official regulatory documents emphasize that use should be for the shortest duration possible because risks, particularly serious cardiovascular and gastrointestinal risks, may increase with higher doses and longer duration of treatment. Continued long-term use is associated with potential risks and is generally managed under the principle of using the shortest duration possible.


Q: Can Rheumac cause changes in mood or sleep?

A: Regulatory documents list central nervous system (CNS) effects, which can include dizziness or drowsiness. For some formulations, reports have included effects such as insomnia (trouble sleeping) and, rarely, other psychiatric disturbances.


Q: What should I do if I think I'm experiencing a rare side effect from Rheumac?

A: Regulatory bodies strongly encourage the reporting of any suspected adverse reaction. Regulatory bodies encourage the reporting of suspected adverse effects to a healthcare provider or directly through the national drug regulatory agency's pharmacovigilance system.


Q: Are there any known restrictions on alcohol consumption while taking Rheumac?

A: Official warnings advise caution or limitation of alcohol consumption while using this medication. This is because alcohol intake may increase the risk of serious gastrointestinal side effects, such as internal bleeding and stomach ulcers, which are associated with the drug.


Q: Is the purpose of Rheumac to cure my condition?

A: Official information describes the purpose of the drug as providing symptomatic relief from pain and inflammation. It manages the symptoms associated with the condition but is not intended to cure the underlying disease itself.


Q: Do I need to get regular blood tests while using Rheumac?

A: For patients who are prescribed this medication for long-term use, official documentation recommends periodic monitoring to track safety. This typically includes checking blood pressure, kidney function, and liver function.


Q: What happens if I forget to take Rheumac at the exact same time each day?

A: The general standard is to take the medication around the same time each day, as directed. However, official missed dose guidance addresses minor time variations, usually recommending that you take the dose when you remember, unless the next dose is almost due.


Q: Can taking Rheumac make me more sensitive to the sun?

A: Yes, official documents include a warning that this medication may cause increased skin sensitivity to sunlight (a reaction known as photosensitivity). Measures such as wearing sunscreen and protective clothing are generally recommended during use.


Q: Are there specific storage conditions for Rheumac mentioned in the official labeling?

A: Yes, specific storage instructions are provided in the official labeling. These typically advise keeping the medication at room temperature, protecting it from excessive heat and moisture, and ensuring it is stored safely out of the reach of children.


Q: Why is Rheumac not used for all types of inflammation?

A: The regulatory indications restrict its use to specific conditions, such as certain forms of arthritis and inflammatory pain. Although the drug affects a broad pathway, its approval for clinical use is limited to those conditions where sufficient evidence of benefit is available.


Q: Is there a maximum length of time someone can safely take Rheumac?

A: Official guidelines emphasize using the lowest effective dose for the shortest duration possible due to potential risks. While specific time limits are set for some short-term uses (like injections), general chronic use is continuously guided by the principle of minimizing exposure.


Q: What does 'contraindication' mean in the context of Rheumac?

A: A contraindication is a pre-existing condition or factor that officially serves as a reason to not use a specific medical treatment. Official documents list conditions, such as known allergy or severe heart failure, for which Rheumac should not be used.


Q: What are the reasons someone might need to switch from Rheumac to a different drug?

A: Reasons to switch include the development of a newly identified contraindication (a condition that makes the drug unsafe to use) or the occurrence of an adverse reaction (a side effect) that is either serious or makes continued use intolerable for the patient.


Q: Do official documents mention any effects of Rheumac on eye health?

A: Yes, specifically for the ophthalmic (eye drop) formulation, official documents mention possible effects like eye redness, irritation, or pain. Serious issues, such as corneal problems, are listed as rare but possible risks.


Q: How is the safety profile of Rheumac tracked after it has been approved?

A: After the drug receives regulatory approval, its safety profile is continuously tracked through national pharmacovigilance systems. This involves collecting and reviewing reports of suspected adverse effects submitted by patients and healthcare professionals.


Q: Can Rheumac interact with common over-the-counter pain relievers?

A: Official documents contain warnings against combining this medication with other common Non-Steroidal Anti-inflammatory Drugs (NSAIDs), which include drugs like aspirin and ibuprofen. This combination is typically avoided due to a significantly increased risk of serious side effects.


Q: Is Rheumac safe for patients who have a history of heart conditions?

A: The drug carries a Boxed Warning in official labeling, which states that it can increase the risk of serious cardiovascular events like heart attack or stroke. Use is generally strongly cautioned or contraindicated in patients with certain severe pre-existing heart conditions or recent heart bypass surgery.


Q: What does the term 'evidence-based medicine' mean for Rheumac?

A: For Rheumac, the term reflects that its regulatory approval is based on extensive clinical trials and scientific data. This process ensures that the benefits of the medication for its approved uses are documented and verified to outweigh the known risks.

How should Rheumac be stored and disposed of?

How to Store and Dispose of Rheumac

Official regulatory information mandates strict adherence to labeled storage and disposal requirements to maintain product stability and ensure environmental safety.


Storage Requirements

Condition Requirement
Temperature Store below 30 C (or 25 C for some forms).
Environment Protect from light and moisture; store in a dry place.
Handling Do not freeze the product. Keep in original, tightly closed packaging.
Stability Keep medicine out of reach of children.
Child Safety Discard product within the labeled stability period after first opening (e.g., 6 months for gel).

Disposal Protocol

Unused or expired Rheumac must be handled as pharmaceutical waste and disposed of according to local regulatory requirements. Do not dispose of the medicine through household trash or the sewage system. This is often required due to the presence of the active substance in surface water, necessitating special environmental consideration.

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

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