What Diclofenac Is Used For
Diclofenac is a nonsteroidal anti-inflammatory drug (NSAID) indicated for treating osteoarthritis, rheumatoid arthritis, primary dysmenorrhea, and mild to moderate pain from various causes including soft tissue injuries. 1
FDA-Approved Indications
The FDA label clearly specifies diclofenac's approved uses 1:
- Osteoarthritis - Relief of signs and symptoms
- Rheumatoid arthritis - Relief of signs and symptoms
- Primary dysmenorrhea - Treatment of menstrual pain
- Mild to moderate pain - General pain relief
Additional Clinical Applications
Beyond the core FDA indications, diclofenac has demonstrated efficacy in several other conditions:
Musculoskeletal Conditions
- Ankylosing spondylitis - Comparable efficacy to other NSAIDs 2, 3
- Soft tissue injuries - Including periarthritis, bursitis, tendonitis, myositis 4
- Acute sports injuries - Ankle, knee, or shoulder injuries 5
- Sciatica and chronic neuroinflammatory pain 4
Acute Pain Conditions
- Renal colic - NSAIDs including diclofenac reduce pain by decreasing inflammation and lowering pressure in the urinary collecting system 6
- Post-surgical pain - Minor surgery recovery 3
- Trauma-related pain 3
Ophthalmic Uses (Topical Formulation)
- Ocular inflammation - Uveitis and keratitis management
- Post-cataract surgery - Prevention of cystoid macular edema and maintenance of mydriasis
- Posterior capsule opacification prevention 7
Formulation-Specific Applications
Topical diclofenac (gel, solution, patch) is particularly effective for 8, 5, 9:
- Knee osteoarthritis with localized pain
- Soft tissue rheumatic disorders
- Acute localized musculoskeletal injuries
The topical route provides therapeutic concentrations at target tissues while minimizing systemic exposure and gastrointestinal complications compared to oral NSAIDs 8.
Critical Safety Context
While discussing indications, prescribers must recognize that diclofenac carries among the highest cardiovascular risks of all NSAIDs 10. Meta-analyses show diclofenac increases vascular events (RR 1.63), cardiovascular events (RR 1.40), recurrent MI (RR 1.54), and mortality (RR 2.40) compared to placebo 10.
Diclofenac is absolutely contraindicated for perioperative pain in coronary artery bypass graft (CABG) surgery 1.
Practical Prescribing Algorithm
For osteoarthritis specifically, guidelines recommend 11:
- Start with paracetamol (acetaminophen) as first-line
- Progress to ibuprofen if inadequate response
- Consider diclofenac only after these options, given its higher cardiovascular risk profile
Use the lowest effective dose for the shortest duration necessary 1. For localized joint pain, strongly consider topical formulations over oral to reduce systemic adverse effects 8, 12.