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Celebrex

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Celebrex (celecoxib) is a nonsteroidal anti-inflammatory drug (NSAID), specifically a COX-2 inhibitor, used to treat pain and inflammation. It helps adults suffering from osteoarthritis, rheumatoid arthritis, and acute pain. The medication works by reducing hormones that cause inflammation and pain signals in the body.


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Product Sheet

Active Ingredient(s)
Celecoxib
Reference Brand
Celebrex
Manufacturer
Pfizer
Product Form
Capsule
Regulatory Classification
Rx
Primary Category
Pain Relief
Product Category
Non-steroidal anti-inflammatory drugs (NSAIDs)
Pharmacological Class
Selective COX-2 inhibitor
Manufacturer Description
A targeted anti-inflammatory used to manage chronic joint pain with a lower risk of stomach irritation than standard aspirin or ibuprofen.
Mechanism of Action
Celecoxib selectively inhibits the COX-2 enzyme, which triggers pain and inflammation. Unlike older NSAIDs, it has less effect on the COX-1 enzyme, which helps protect the stomach lining.
Route of Administration
Oral
Onset Time
1-2 hours
Duration
12-24 hours
Contraindications
Sulphonamide allergy, Inflammatory bowel disease, Severe heart disease
Severe Adverse Events
Heart attack or stroke risk, Liver damage, Kidney failure
Common Side Effects
Stomach discomfort, Sore throat, Dizziness
Uncommon Side Effects
Swelling of legs and feet, Insomnia, Skin rash
Drug Interactions
Fluconazole, Lithium, Blood pressure medications, Warfarin
Pregnancy Safety Warnings
Do not use if pregnant or breastfeeding.
Age Restrictions
Adult use only (over 18)
Storage Guidelines
Store at room temperature.
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Celebrex FAQ

Can I take Celebrex with my regular ibuprofen?

No. Both medicines belong to the NSAID class and using them together increases the risk of gastrointestinal bleeding, kidney injury, and cardiovascular events. Discuss alternative pain-relief strategies with your prescriber.

Does Celebrex cause stomach ulcers?

Celebrex has a lower incidence of ulcer formation compared with non-selective NSAIDs because it spares COX-1. However, it can still cause gastrointestinal irritation and, rarely, ulceration, especially in patients with a prior history of ulcer disease.

Will Celebrex show up on a drug test for athletes?

Celecoxib is not listed as a prohibited substance by the World Anti-Doping Agency (WADA). Routine drug-testing panels for sports generally do not screen for celecoxib, but athletes should disclose any medication use to their medical team.

What does the imprint on a Celebrex tablet look like?

In the UK, a 100 mg tablet is typically imprinted with “C100” and a 200 mg tablet with “C200”. The exact appearance may vary by manufacturer.

Can I take Celebrex while pregnant?

Celebrex is contraindicated in the third trimester of pregnancy because it may cause premature closure of the fetal ductus arteriosus. It should be avoided throughout pregnancy unless the benefits outweigh the risks and a specialist advises otherwise.

How long does it take for pain relief to start?

Many patients notice a reduction in pain within one hour of taking the first dose, with the peak effect occurring around 2-3 hours.

Is Celebrex suitable for elderly patients?

Elderly individuals can use Celebrex, but they have an increased susceptibility to cardiovascular, renal, and gastrointestinal complications. Dose adjustments and closer monitoring are often recommended.

What should I do if I miss a dose?

Take the missed tablet as soon as you remember, unless it is almost time for your next scheduled dose. In that case, skip the missed dose and continue with your regular dosing interval. Do not double the dose.

Can Celebrex be taken with alcohol?

Moderate alcohol consumption does not usually cause a serious interaction, but both alcohol and celecoxib can irritate the stomach lining. Excessive drinking raises the risk of gastrointestinal bleeding and should be avoided.

Is there a generic version of Celebrex available in the UK?

Yes. Celecoxib is available as a generic prescription medication in the same 100 mg and 200 mg strengths, often at a lower cost than the branded Celebrex.

Celebrex: Generic Medication Overview

Celebrex is a brand-name prescription medication that contains the active ingredient celecoxib. It belongs to the pain-relief class of drugs known as non-steroidal anti-inflammatory drugs (NSAIDs), specifically a selective cyclo-oxygenase-2 (COX-2) inhibitor. Celebrex is supplied as a pill in two strengths: 100 mg and 200 mg. In the United Kingdom it is classified as a prescription-only medicine and is regulated by the Medicines and Healthcare products Regulatory Agency (MHRA).

How Celebrex Works in the Body

Celecoxib works by selectively inhibiting the COX-2 enzyme. COX-2 is an enzyme that becomes active at sites of inflammation and produces prostaglandins-chemicals that cause pain, swelling, and fever. By blocking COX-2 while sparing the COX-1 enzyme (which protects the stomach lining and supports platelet function), celecoxib reduces pain and inflammation with a lower risk of stomach irritation compared with traditional NSAIDs.

  • Onset of action: Pain relief can begin within 1 hour of taking a dose.
  • Peak effect: Maximum pain-relieving effect is usually observed 2-3 hours after ingestion.
  • Duration: The therapeutic effect typically lasts 8-12 hours, which aligns with once-daily or twice-daily dosing schedules.

Celecoxib is absorbed from the gastrointestinal tract, reaches peak plasma concentrations in about 3 hours, and is metabolised primarily by the liver enzyme CYP2C9. About 97 % of the dose is eliminated in the urine, either unchanged or as metabolites.

Conditions Treated by Celebrex

Celebrex is approved by the MHRA for the following indications:

  • Osteoarthritis - relief of pain and improvement in joint function.
  • Rheumatoid arthritis - reduction of signs and symptoms of inflammation.
  • Ankylosing spondylitis - alleviation of spinal pain and stiffness.
  • Acute pain (e.g., postoperative pain, dental pain, musculoskeletal injury).
  • Primary dysmenorrhea - relief of menstrual-related cramp pain.

These indications are based on clinical trials that demonstrated celecoxib’s efficacy in reducing pain scores and improving functional outcomes compared with placebo or other NSAIDs.

Off-Label and Investigational Applications

Evidence from peer-reviewed studies suggests that celecoxib has been explored for a limited number of off-label uses, such as:

  • Chemoprevention of colorectal adenomas in patients with familial adenomatous polyposis.
  • Management of certain cancers (e.g., breast and colorectal) as an adjunct to chemotherapy, based on its COX-2 inhibition properties.

These uses are not approved by the MHRA or the European Medicines Agency (EMA). Off-label use requires supervision by a qualified healthcare professional, and the potential benefits must be weighed against known cardiovascular and gastrointestinal risks.

Who Should (Not) Use Celebrex?

Ideal Candidates

  • Adults with chronic inflammatory joint conditions who need consistent pain control.
  • Patients who have experienced gastrointestinal intolerance with non-selective NSAIDs but have no contraindicating cardiovascular risk.

Absolute Contraindications

  • Known hypersensitivity to celecoxib, any other COX-2 inhibitor, or components of the tablet.
  • History of aspirin-sensitive asthma, urticaria, or allergic reactions to NSAIDs.
  • Established coronary artery disease, heart failure (NYHA class III/IV), or a history of myocardial infarction or stroke.
  • Active peptic ulcer disease or gastrointestinal bleeding.
  • Severe hepatic impairment (Child-Pugh class C).

Relative Contraindications

  • Pregnancy - especially the third trimester (risk of premature closure of the fetal ductus arteriosus).
  • Lactation - celecoxib is excreted in breast milk; caution advised.
  • Renal impairment - dose adjustment and close monitoring recommended.
  • Elderly patients - higher incidence of cardiovascular and renal adverse events.

Special Populations

  • Patients on anticoagulants (e.g., warfarin) or antiplatelet agents (e.g., clopidogrel) should be monitored for enhanced bleeding risk.
  • Individuals with CYP2C9 poor-metaboliser status may experience higher plasma levels; dosage may need reduction.

Safety Profile: Side Effects and Interactions

Common Side Effects

  • Stomach upset, abdominal pain, or dyspepsia
  • Diarrhoea or constipation
  • Nausea
  • Headache
  • Elevated blood pressure

These effects are usually mild and transient. If they persist, patients should discuss management with a healthcare professional.

Serious Adverse Events

  • Cardiovascular thrombotic events (myocardial infarction, stroke) - risk increases with long-term use, especially at high doses.
  • Gastrointestinal bleeding, ulceration, or perforation - although lower than with non-selective NSAIDs, the risk is not eliminated.
  • Severe skin reactions (e.g., Stevens-Johnson syndrome, toxic epidermal necrolysis).
  • Renal impairment - acute kidney injury, particularly in dehydrated patients or those with pre-existing kidney disease.
  • Hepatotoxicity - marked increases in liver enzymes; rare cases of hepatitis.

Drug Interactions

  • CYP2C9 inhibitors (e.g., fluconazole, amiodarone) → increased celecoxib concentrations.
  • Anticoagulants / antiplatelet agents (warfarin, aspirin, clopidogrel) → heightened bleeding risk.
  • Angiotensin-converting enzyme (ACE) inhibitors or diuretics → possible reduction in antihypertensive effect and increased risk of renal dysfunction.
  • Selective serotonin reuptake inhibitors (SSRIs) or serotonin-norepinephrine reuptake inhibitors (SNRIs) → additive risk of gastrointestinal bleeding.

Food and Lifestyle Interactions

  • Celebrex can be taken with or without food; a meal may lessen mild stomach upset.
  • Alcohol consumption should be limited, as it may increase gastrointestinal bleeding risk.
  • No specific restrictions on driving or operating machinery, but patients experiencing dizziness or severe pain should exercise caution.

How to Take Celebrex

  • Standard dosing (based on the 100 mg and 200 mg tablets):

  • Osteoarthritis, rheumatoid arthritis, ankylosing spondylitis:

  • 200 mg once daily, or 100 mg twice daily.

  • Acute pain:

  • 200 mg twice daily (total 400 mg per day) for the first 1-2 days, then 200 mg once daily as needed.

  • Primary dysmenorrhea:

  • 200 mg once daily for up to 3 days, starting at the onset of menstrual pain.

  • Administration: Swallow the pill whole with water. Do not crush, chew, or split the tablet unless a specific formulation (e.g., dispersible) is prescribed.

  • Missed dose: Take the missed tablet as soon as remembered unless it is near the time of the next scheduled dose; do not double-dose.

  • Overdose: Symptoms may include nausea, vomiting, abdominal pain, and drowsiness. Seek emergency medical care; activated charcoal may be considered if presentation is early.

  • Discontinuation: Celecoxib does not usually require tapering. However, patients with long-term use should discuss a gradual cessation with a healthcare provider to monitor for rebound pain or inflammation.

All dosing decisions must be individualized by a prescriber based on the patient’s condition, response, and comorbidities.

Monitoring and Follow-Up

  • Blood pressure should be measured before initiating therapy and periodically during treatment, especially in patients with hypertension.
  • Renal function (serum creatinine, eGFR) and liver enzymes (ALT, AST) are advisable at baseline and during prolonged therapy.
  • Patients should be instructed to report any signs of chest pain, shortness of breath, sudden severe headache, visual changes, or gastrointestinal bleeding promptly.

Storage and Handling

  • Store the tablets at room temperature (15-30 °C), away from direct sunlight, moisture, and heat.
  • Keep the medication in its original packaging until use.
  • Do not use the product beyond the expiration date printed on the label.
  • Dispose of unused tablets safely, preferably through a pharmacy take-back program, to prevent accidental ingestion by children or pets.

Medication-Specific Glossary

COX-2 Selective Inhibitor
A drug that primarily blocks the cyclo-oxygenase-2 enzyme, reducing inflammation while sparing COX-1-mediated protection of the stomach lining.
NSAID
Non-steroidal anti-inflammatory drug; a class of medicines that reduce pain, fever, and inflammation by inhibiting cyclo-oxygenase enzymes.
Cardiovascular Risk
The probability of experiencing heart-related events such as heart attack or stroke; certain NSAIDs, including celecoxib, may elevate this risk when used long-term or at high doses.
Therapeutic Window
The range of drug concentrations in the blood that yields clinical benefit without causing unacceptable side effects.

Medical Disclaimer

This article provides educational information about Celebrex and is not a substitute for professional medical advice. Treatment decisions, including use for unapproved indications, must be made under the guidance of a qualified healthcare provider. The content is intended for informational purposes and does not constitute medical recommendations. Always consult a physician before starting, stopping, or changing any medication regimen.

Information for Celebrex is sourced from established medical standards and updated frequently. It is provided for general guidance and should be confirmed with a healthcare professional before use.
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