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Diclofenac Topical (Diclofenac Sodium Topical Gel (Voltaren))

Category: Pain & Inflammation. Status: FDA Approved (OTC).

A topical NSAID that delivers potent anti-inflammatory and analgesic effects directly to the site of pain without significant systemic absorption. Ideal for joint, tendon, and muscle pain with minimal GI or cardiovascular risk.

How it works

Inhibits cyclooxygenase-1 and -2 (COX-1/2) locally in tissue, reducing prostaglandin E2 synthesis at the inflammation site. Topical delivery achieves therapeutic tissue concentrations with plasma levels <5% of oral dosing.

Key facts

  • Molecular weight: 318.13 Da (sodium salt)
  • Half-life: ~1-2 hours (plasma); tissue penetration lasts 12+ hours
  • Bioavailability: ~6% systemic (topical); local tissue levels therapeutic
  • Storage: Room temperature.

Dosing overview

  • Typical dose: 4g gel (1% or 2%) per joint
  • Frequency: 3-4x daily
  • Duration: As needed or 2-4 week courses
  • Route: Topical gel

Reported benefits

  • Localized pain relief
  • Minimal systemic side effects
  • Joint and tendon inflammation
  • Post-workout recovery
  • No GI ulcer risk
  • OTC availability

Possible side effects

  • Skin irritation at application site
  • Dryness/peeling
  • Rare: allergic dermatitis
  • Minimal systemic NSAID effects at recommended doses

Research

  • Topical diclofenac vs oral for knee OA (2020): Equivalent pain reduction to oral diclofenac in knee osteoarthritis with 85% fewer GI adverse events over 12-week trial.
  • Topical NSAIDs for acute sports injuries (2021): Topical diclofenac reduced acute soft tissue injury pain by 50% within 72h, similar to oral NSAIDs without systemic risks.

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Research and educational reference only. Not medical advice.