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Diclofenac penetrates skin and underlying tissue to inhibit COX-1 and COX-2 enzymes locally, blocking prostaglandin synthesis at the site of inflammation — reducing pain and swelling without significant systemic absorption.
Commercial topical diclofenac (Voltaren, Pennsaid) is available only in 1–1.5% concentrations. Compounding allows higher concentrations (2–10%+), multi-drug combinations (diclofenac + ketoprofen + lidocaine + cyclobenzaprine), and custom bases that enhance skin penetration for deeper relief.
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Topical diclofenac is a non-steroidal anti-inflammatory drug (NSAID) applied directly to the skin over affected joints or tissues. Unlike oral NSAIDs, topical application delivers anti-inflammatory effects locally with minimal systemic absorption — dramatically reducing the risk of gastrointestinal, cardiovascular, and renal side effects.
Compounding pharmacies create custom topical formulations with higher diclofenac concentrations, specialized penetration-enhancing bases (PLO gel, DMSO), and multi-drug combinations targeting multiple pain pathways simultaneously.
Common compounding combinations include diclofenac + ketoprofen + lidocaine for nerve and joint pain, or diclofenac + cyclobenzaprine + gabapentin for musculoskeletal spasm-related pain.
COX Inhibition
Diclofenac inhibits both COX-1 and COX-2 enzymes, blocking the conversion of arachidonic acid to prostaglandins — the key mediators of pain, inflammation, and fever.
Local Action
Topical application results in high drug concentrations in underlying subcutaneous tissue, synovial fluid, and muscle while maintaining low systemic plasma levels.
Penetration Enhancers
Compounded bases using DMSO or PLO (pluronic lecithin organogel) significantly enhance skin penetration, enabling therapeutic concentrations at deeper tissue levels.
Musculoskeletal: Osteoarthritis of the knee, hand, shoulder; tendinitis; bursitis; plantar fasciitis
Neuropathic Pain: Localized nerve pain (combined with lidocaine/gabapentin)
Sports Injuries: Sprains, strains, overuse injuries
Post-surgical: Localized post-operative pain management
Diclofenac Gel (1–3%): Apply 2–4g to affected area 3–4 times daily
Multi-drug Compounds: 1–2g applied 2–4x daily per provider instructions
Do not apply to broken skin. Wash hands after application unless treating hands.
Local (common):
Systemic (rare due to low absorption):
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