Diclofenac sodiummechanism of action of diclofenac sodiumdiclofenac possess analgesic, anti-inflammatory and antipyretic action. it inhibits the enzyme cyclo-oxygenase and there by inhibits the synthesis of prostaglandins (pgs). it is more potent against cyclo-oxygenase-2 enzyme as compared to other nsaids like indomethacin, naproxen etc. it reduces intracellular concentrations of free arachidonic acid in leukocyte by altering its release or uptake. .interactions for diclofenac sodiumlithium & digoxin : blood levels of lithium and digoxin increased leading to enhanced efficacy and posible toxicity. diuretics : inhibits diuretics but efficacy of potassium sparing diuretics enhanced. methotrexate : toxicity enhanced. salicylates : efficacy of salicylates reduced. cyclosporine : increases nephrotoxicity of both agents. hydantoins : increases serum levels resulting in toxicity.
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