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Acetaminophen for osteoarthritis.

T E Towheed¹, L Maxwell, M G Judd

¹Queen's University, Medicine and of Community Health and Epidemiology, Etherington Hall-Room 2066, Kingston, Ontario, Canada, K7L 3N6. tt5@post.queensu.ca

The Cochrane Database of Systematic Reviews

|January 27, 2006

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See all related articles

Non-steroidal anti-inflammatory drugs (NSAIDs) are more effective than acetaminophen for osteoarthritis pain relief, though both have similar safety profiles. NSAIDs offer greater benefits for moderate-to-severe pain, but trial durations were short.

Area of Science:

Rheumatology
Pharmacology
Clinical Research

Background:

Osteoarthritis (OA) is the most prevalent form of arthritis, necessitating clear treatment guidelines.
Current guidelines and expert opinions differ on whether acetaminophen (paracetamol) or non-steroidal anti-inflammatory drugs (NSAIDs) should be the primary pharmacologic treatment for OA.
Comparative safety data between acetaminophen and NSAIDs is crucial for informed clinical decisions.

Purpose of the Study:

To evaluate the efficacy and safety of acetaminophen compared to placebo.
To assess the efficacy and safety of acetaminophen in comparison to various NSAIDs (e.g., ibuprofen, diclofenac, celecoxib, naproxen).
To provide evidence-based recommendations for first-line pharmacologic therapy in osteoarthritis management.

Main Methods:

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Systematic review and meta-analysis of published randomized controlled trials (RCTs).
Searched major databases (MEDLINE, EMBASE, CENTRAL) up to July 2005 for relevant RCTs.
Included RCTs focused on acetaminophen efficacy and safety in OA patients, analyzing pain, physical function, and global assessments.

Main Results:

Fifteen RCTs involving 5986 participants were analyzed.
Acetaminophen showed a statistically significant but clinically questionable improvement in pain compared to placebo (SMD -0.13).
NSAIDs demonstrated superior efficacy over acetaminophen for pain reduction, functional status, and global assessments in OA. Safety profiles were similar, though traditional NSAIDs had a higher risk of gastrointestinal events.

Conclusions:

NSAIDs are more effective than acetaminophen for managing knee and hip pain in osteoarthritis.
The modest treatment effect and short trial durations (median 6 weeks) warrant careful consideration in treatment decisions.
For moderate-to-severe OA pain, NSAIDs appear to be the more effective therapeutic option.