Additionally, they both come in many different strengths, with lower strengths available OTC and higher strengths available with a prescription. One main difference is that the effects of naproxen last longer than the effects of ibuprofen (Advil). Typically, naproxen is taken every 8 to 12 hours, while ibuprofen (Advil) is taken every 4 to 6 hours. Diclofenac is a stronger NSAID than ibuprofen. Taking Diclofenac 2-3 times daily can help treat arthritis pain, however has a greater side-effect profile to the heart and stomach, which is which it is not so often recommended. Treating joint pain with Ibuprofen will usually require a higher dose with a prescription likely required.
Because the IC 50 of diclofenac is approximately 900 times lower than that of ibuprofen, cumulative absorption of ibuprofen-containing formulations would need to be 700 times greater than that of diclofenac products to compensate for this difference and achieve comparable anti-inflammatory activity. According to Fick’s law, for ibuprofen
Diclofenac is a nonsteroidal anti-inflammatory drug (NSAID) of the phenylacetic acid class with anti-inflammatory, analgesic, and antipyretic properties. Contrary to the action of many traditional NSAIDs, diclofenac inhibits cyclooxygenase (COX)-2 enzyme with greater potency than it does COX-1. Similar to other NSAIDs, diclofenac is associated with serious dose-dependent gastrointestinal As a topical gel, a smaller amount of diclofenac from Voltaren Arthritis Pain Gel reaches the bloodstream compared with the oral form of diclofenac. In a clinical study, the systemic exposure with Voltaren Arthritis Pain Gel was 6%, or 94% less than the systemic exposure with the oral NSAID diclofenac.

Pain. 500 mg PO initially, then 250 mg PO q6-8hr or 500 mg PO q12hr PRN; not to exceed 1250 mg/day naproxen base on day 1; subsequent daily doses should not exceed 1000 mg naproxen base. Extended release: 750-1000 mg PO qDay; may temporarily increase to 1500 mg/day if tolerated well and clinically indicated.

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is diclofenac stronger than naproxen