Introduction
Nimesulide is a non-steroidal anti-inflammatory drug (NSAID) that is used for its analgesic (pain-relieving), antipyretic (fever-reducing), and anti-inflammatory properties. It is primarily used for the short-term treatment of acute pain and for symptomatic treatment of osteoarthritis in patients where other NSAIDs are not effective or appropriate. Nimesulide is not approved in some countries (such as the United States) due to concerns over liver toxicity, but it remains in use in various parts of Europe, Asia, and Latin America under careful prescription.
Drug class: Non-steroidal anti-inflammatory drug (NSAID), selective COX-2 inhibitor
Route of administration: Oral (tablets, granules), topical, or rectal
Common brand names: Aulin®, Mesulid®, Nimegesic®, Nicip®
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Mechanism of Action
Nimesulide works by selectively inhibiting the enzyme cyclooxygenase-2 (COX-2), which is involved in the synthesis of prostaglandins. These substances play a key role in inflammation, pain, and fever. Unlike traditional NSAIDs that inhibit both COX-1 and COX-2, nimesulide provides anti-inflammatory effects with relatively less impact on COX-1, which helps protect the stomach lining and maintain platelet function.
In addition to its COX-2 inhibition, nimesulide may have antioxidant effects and inhibit mediators such as tumor necrosis factor-alpha (TNF-α), contributing to its anti-inflammatory efficacy.
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Indications and Uses
Nimesulide is indicated for:
Acute pain relief (e.g. musculoskeletal, dental, or post-surgical pain)
Dysmenorrhea (painful menstruation)
Osteoarthritis (short-term symptomatic treatment)
Inflammatory conditions such as tendonitis or bursitis
Occasionally used in fever when other antipyretics are ineffective (under medical supervision)
Use is generally limited to short-term treatment (typically ≤15 days) due to its safety profile.
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Dosage and Administration
The typical adult oral dose is 100 mg taken twice daily, after meals to reduce gastrointestinal side effects. It is available in various forms including tablets, dispersible granules, and suspensions for pediatric use (only in some countries).
Topical formulations (gels or creams) may be applied to the affected area 2–3 times daily, depending on the product. Rectal suppositories (in certain markets) are also occasionally used.
Nimesulide is not recommended for use in children under 12 years of age or in elderly patients with liver or kidney problems.
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Pharmacokinetics
After oral administration, nimesulide is rapidly absorbed, with peak plasma concentrations reached within 1.5 to 2.5 hours. It is extensively bound to plasma proteins (around 99%) and primarily metabolized in the liver to its main active metabolite, 4-hydroxy nimesulide.
Its elimination half-life is approximately 1.8–4.7 hours. The drug and its metabolites are mainly excreted through urine (about 50%) and feces.
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Common Side Effects
Commonly observed adverse effects include:
Gastrointestinal discomfort such as nausea, diarrhea, dyspepsia, and abdominal pain
Headache
Drowsiness or dizziness
Skin rashes or itching
Elevated liver enzymes (indicative of liver stress)
To reduce the risk of stomach upset, nimesulide is usually taken after food.
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Serious or Rare Adverse Reactions
Serious adverse reactions, although rare, include:
Hepatotoxicity (liver damage), including hepatitis, jaundice, and liver failure
Gastrointestinal bleeding or ulcer (less frequently than with non-selective NSAIDs)
Renal impairment
Severe allergic reactions (anaphylaxis or Stevens-Johnson syndrome)
Hematologic effects like thrombocytopenia (low platelet count)
Due to the risk of liver injury, treatment duration should be limited, and liver function should be monitored during use.
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Contraindications and Precautions
Nimesulide is contraindicated in:
Patients with active or history of liver dysfunction or hepatotoxic reaction to nimesulide
Peptic ulcers, gastrointestinal bleeding, or inflammatory bowel disease
Severe renal or hepatic impairment
Known hypersensitivity to nimesulide or other NSAIDs
Children under 12 years of age
Pregnant or breastfeeding women
It should be used with caution in elderly patients and those with cardiovascular risk factors. Alcohol consumption should be avoided during treatment due to heightened liver risk.
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Drug Interactions
Nimesulide may interact with:
Other NSAIDs or corticosteroids (increased risk of gastrointestinal bleeding)
Anticoagulants like warfarin (enhanced bleeding risk)
Methotrexate or cyclosporine (increased toxicity)
Diuretics and antihypertensives (reduced effectiveness)
Lithium and digoxin (increased plasma levels)
As nimesulide is metabolized in the liver, concomitant use of drugs that affect liver enzymes could alter its levels or increase toxicity.
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Use in Special Populations
Pregnancy: Not recommended during pregnancy, especially in the third trimester, due to risks of ductus arteriosus closure and reduced uterine contractions.
Lactation: Contraindicated, as the drug may pass into breast milk and harm the infant.
Children: Not recommended for children under 12 years due to risks of adverse effects.
Elderly: Use cautiously, especially in those with liver, kidney, or cardiac conditions; close monitoring is required.
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Regulatory Status
Nimesulide is approved in certain countries such as Italy, India, Russia, and some Latin American nations. However, its use has been restricted or banned in others, including the USA, Canada, and several European countries, largely due to concerns about liver toxicity. In countries where it is approved, strict guidelines are usually in place to limit its duration and indications.
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Summary
Nimesulide is a selective COX-2 inhibitor NSAID used for short-term relief of pain and inflammation. It is effective in treating conditions like osteoarthritis, dysmenorrhea, and various types of acute pain. Its favorable gastrointestinal profile makes it distinct from traditional NSAIDs, but its potential to cause liver injury has led to regulatory restrictions in some countries. As such, its use should be limited in duration and reserved for patients who cannot tolerate other NSAIDs, with regular monitoring of liver function during treatment.
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