Generic Medicine Info
Indications and Dosage
Acute musculoskeletal disorders, Dysmenorrhoea, Mild to moderate pain
Adult: As conventional tab/gastro-resistant tab/oral susp: Initially, 500 mg followed by 250 mg 6-8 hourly as necessary. Max: 1,250 mg on the 1st day then 1,000 mg thereafter. As extended-release tab: Initially, 1,000 mg once daily, may be adjusted to 1,500 mg once daily for a short period. Max: 1,000 mg daily.
Elderly: Lowest effective dose for the shortest possible duration.

Juvenile idiopathic arthritis
Child: >5 years 10 mg/kg daily in 2 divided doses 12 hourly. Max: 1,000 mg daily.

Ankylosing spondylitis, Osteoarthritis, Rheumatoid arthritis
Adult: As conventional tab/gastro-resistant tab/oral susp: 500-1,000 mg daily as a single or in 2 divided doses. As effervescent tab: Initially, 250 mg twice daily, may be adjusted to 500-1,000 mg daily in 2 divided doses. As extended-release tab: 750-1,000 mg once daily, may be adjusted according to clinical response. Max: 1,000 mg daily. As delayed-release tab: 375 mg or 500 mg twice daily, may be adjusted according to clinical response. Use lowest effective dose for the shortest possible duration based on individual patient treatment goals.
Elderly: Lowest effective dose for the shortest possible duration.

Acute gout
Adult: As conventional tab/effervescent tab: Initially, 750 mg followed by 250 mg 8 hourly until the attack subsides. As extended-release tab: Initially, 1,000-1,500 mg followed by 1,000 mg once daily until the attack subsides.
Elderly: Lowest effective dose for the shortest possible duration.
Special Patient Group
Patient with severe night time pain or morning stiffness, pain as predominant symptom in osteoarthritis, and who are switched to naproxen from high dose of another anti-rheumatic drug: As conventional tab/gastro-resistant tab/oral susp: Loading dose of 750 mg or 1,000 mg daily.
Renal Impairment
CrCl <30 mL/min or on dialysis: Contraindicated.
Hepatic Impairment
Severe: Contraindicated.
Should be taken with food.
Hypersensitivity. Patient with active or history of recurrent peptic ulcer, history of gastrointestinal bleeding or perforation related to previous NSAID therapy, chronic dyspepsia, severe heart failure, history of asthma, bronchospasm, nasal polyps, rhinitis, angioedema, or urticaria associated with aspirin or NSAID therapy. Treatment of peri-operative pain in the setting of CABG surgery. Renal (CrCl <30 mL/min) and severe hepatic impairment. Pregnancy (3rd trimester).
Special Precautions
Patient with or a history of bronchial asthma, inflammatory bowel disease (e.g. Crohn’s disease, ulcerative colitis), mild to moderate heart failure, fluid retention, ischaemic heart disease, peripheral arterial disease, cerebrovascular disease, coagulation disorders, risk factors for CV events (e.g. hyperlipidaemia, diabetes mellitus, smoking), cirrhosis, chronic alcoholic liver disease, dehydration, hypovolaemia. Debilitated patients. Mild to moderate renal and hepatic impairment. Elderly. Pregnancy (1st-2nd trimester) and lactation.
Adverse Reactions
Significant: Aggrevated asthma, bronchospasm, hypertension, hyperkalaemia, fluid retention, anaemia, increased ALT/AST.
Blood and lymphatic system disorders: Haemolysis, purpura, agranulocytosis, leucopenia, neutropenia, thrombocytopenia.
Cardiac disorders: Palpitation.
Ear and labyrinth disorders: Tinnitus, hearing disturbances.
Eye disorders: Visual disturbances, corneal opacity.
Gastrointestinal disorders: Nausea, vomiting, constipation, abdominal pain, heartburn, diarrhoea, flatulence, dyspepsia, stomatitis.
General disorders and administration site conditions: Fatigue, malaise, pyrexia, diaphoresis.
Hepatobiliary disorders: Jaundice, abnormal liver function.
Musculoskeletal and connective tissue disorders: Myalgia, muscle weakness.
Nervous system disorders: Headache, vertigo, paraesthesia.
Psychiatric disorders: Insomnia, depression, confusion, hallucination, disorientation, dream abnormality.
Renal and urinary disorders: Cystitis.
Respiratory, thoracic and mediastinal disorders: Dyspnoea, asthma, eosinophilic pneumonitis, pulmonary oedema.
Skin and subcutaneous tissue disorders: Pruritus, urticaria, rash, ecchymoses, alopecia, photosensitivity reaction.
Vascular disorders: Vasculitis.
Potentially Fatal: Gastrointestinal obstruction, inflammation, bleeding, ulceration or perforation, CV thrombotic events including MI and stroke, anaphylactic reactions. Rarely, fulminant hepatitis, hepatic necrosis, hepatic failure, angioedema, Stevens-Johnson syndrome, toxic epidermal necrolysis, exfoliative dermatitis.
Parenteral/PO/Rectal: Z (NSAIDs caused foetal ductus arteriosus premature closure, foetal renal impairment and persistent pulmonary hypertension. Avoid near term, else use lowest dose for shortest time.)
Patient Counseling Information
This drug may cause dizziness, drowsiness or blurred vision, if affected, do not drive or operate machinery.
Monitoring Parameters
Monitor CBC, chemistry profile, renal and liver function. Blood pressure should be monitored during initiation of treatment and throughout the course of therapy.
Symptoms: Headache, nausea, vomiting, epigastric pain, indigestion, heartburn, gastrointestinal bleeding, lethargy, hypoprothrombinaemia, apnoea, metabolic acidosis. Rarely, diarrhoea, disorientation, excitation, drowsiness, dizziness, tinnitus, fainting, convulsions, hypertension, respiratory depression, coma, acute renal and liver damage. Management: Symptomatic and supportive treatment. Consider activated charcoal, emesis, osmotic cathartic, or gastric lavage within 1-4 hours of ingestion. Ensure good urine output. Administer IV diazepam for frequent or prolonged convulsions.
Drug Interactions
May increase the risk of bleeding with other NSAIDs or salicylates (e.g. aspirin), anticoagulants (e.g. warfarin), corticosteroids, SSRI. May decrease efficacy of antihypertensive agents (e.g. ß-blockers, ACE inhibitors, angiotensin II receptor antagonists). Increased risk of nephrotoxicity of ciclosporin and tacrolimus. May increase risk of haematological toxicity with zidovudine. Reduced natriuretic effects of diuretics (e.g. furosemide, thiazide diuretics). Increased plasma concentration and prolonged half-life with probenecid. May increase serum levels of lithium, digoxin, and methotrexate. May decrease the effects of mifepristone. Increased risk of myelosuppression, renal and gastrointestinal toxicity of pemetrexed. Delayed absorption rate with antacid, colestyramine, and sucralfate.
Food Interaction
Decreased rate of absorption with food.
Lab Interference
May result to false-positive aldosterone/renin ratio (ARR). May interfere with 5-hydroxyindoleacetic acid (5-HIAA) urinary assays. May cause a falsely elevated urinary 17-ketogenic steroid concentrations by interfering with the m-dinitrobenzene reagent in Porter-Silber test.
Description: Naproxen, a propionic acid derivative, is a prototypical NSAID which reversibly inhibits the cyclooxygenase-1 and -2 (COX-1 and -2) enzymes, thus resulting in decreased formation of prostaglandin precursors. It has anti-inflammatory, analgesic and antipyretic activity, and can inhibit platelet aggregation.
Onset: Analgesic: 30-60 minutes.
Duration: Analgesic: <12 hours.
Absorption: Readily absorbed from the gastrointestinal tract. Decreased absorption rate with food. Bioavailability: 95%. Time to peak plasma concentration: Conventional tab: Approx 1-2 hours (naproxen Na); Approx 2-4 hours (naproxen); Delayed-release tab: 4-6 hours (empty stomach); 12 hours (with food); 1-4 hours (oral susp).
Distribution: Diffuses into synovial fluid. Crosses placenta and distributed into breast milk (small amounts). Volume of distribution: 0.16 L/kg. Plasma protein binding: >99% mainly to albumin.
Metabolism: Extensively metabolised in the liver by CYP1A2 and CYP2C9 isoenzymes to inactive 6-O-desmethylnaproxen which undergoes further metabolism to its respective acylglucuronide conjugate metabolites.
Excretion: Mainly via urine (approx 95%) as unchanged drug and metabolites; faeces (<5%). Elimination half-life: Approx 12-17 hours.
Chemical Structure

Chemical Structure Image

Source: National Center for Biotechnology Information. PubChem Database. Naproxen, CID=156391, (accessed on Jan. 22, 2020)

Store between 15-30°C. Protect from light and heat.
MIMS Class
Nonsteroidal Anti-Inflammatory Drugs (NSAIDs)
ATC Classification
M01AE02 - naproxen ; Belongs to the class of propionic acid derivatives of non-steroidal antiinflammatory and antirheumatic products.
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Buckingham R (ed). Naproxen. Martindale: The Complete Drug Reference [online]. London. Pharmaceutical Press. Accessed 10/04/2019.

Joint Formulary Committee. Naproxen. British National Formulary [online]. London. BMJ Group and Pharmaceutical Press. Accessed 10/04/2019.

Naprosyn EC 375 mg Gastro-Resistant Tablets (Atnahs Pharma UK Limited). MHRA. Accessed 10/04/2019.

Naproxen Orion 25 mg/mL Oral Suspension (Orion Corporation). MHRA. Accessed 10/04/2019.

Naproxen Sodium Tablet, Film-coated, Extended Release (Actavis Pharma Inc.). DailyMed. Source: U.S. National Library of Medicine. Accessed 10/04/2019.

Naproxen Tablet, Delayed Release (Teva Pharmaceuticals USA, Inc). DailyMed. Source: U.S. National Library of Medicine. Accessed 10/04/2019.

Disclaimer: This information is independently developed by MIMS based on Naproxen from various references and is provided for your reference only. Therapeutic uses, prescribing information and product availability may vary between countries. Please refer to MIMS Product Monographs for specific and locally approved prescribing information. Although great effort has been made to ensure content accuracy, MIMS shall not be held responsible or liable for any claims or damages arising from the use or misuse of the information contained herein, its contents or omissions, or otherwise. Copyright © 2022 MIMS. All rights reserved. Powered by
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