Diclofenac sodium delayed-release tablets is a benzene-acetic acid derivative. Diclofenac sodium is a white or slightly yellowish crystalline powder and is sparingly soluble in water at 25°C. The chemical name is 2-[(2,6-dichlorophenyl)amino] benzeneacetic acid, monosodium salt. The molecular weight is 318.14. Its molecular formula is C 14H 10Cl 2NNaO 2, and it has the following structural formula
The inactive ingredients in diclofenac sodium delayed-release tablets include: hydroxypropyl methylcellulose, lactose monohydrate, magnesium stearate, methacrylic acid copolymer, microcrystalline cellulose, polyethylene glycol, povidone, propylene glycol, sodium starch glycolate, talc, titanium dioxide, triethyl citrate.CLINICAL PHARMACOLOGY Mechanism of Action
Diclofenac has analgesic, anti-inflammatory, and antipyretic properties.
The mechanism of action of diclofenac, like that of other NSAIDs, is not completely understood but involves inhibition of cyclooxygenase (COX-1 and COX-2).
Diclofenac is a potent inhibitor of prostaglandin synthesis in vitro. Diclofenac concentrations reached during therapy have produced in vivo effects. Prostaglandins sensitize afferent nerves and potentiate the action of bradykinin in inducing pain in animal models. Prostaglandins are mediators of inflammation. Because diclofenac is an inhibitor of prostaglandin synthesis, its mode of action may be due to a decrease of prostaglandins in peripheral tissues.Pharmacokinetics Absorption
Diclofenac is 100% absorbed after oral administration compared to IV administration as measured by urine recovery. However, due to first-pass metabolism, only about 50% of the absorbed dose is systemically available (see Table 1). Food has no significant effect on the extent of diclofenac absorption. However, there is usually a delay in the onset of absorption of 1 to 4.5 hours and a reduction in peak plasma levels of
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