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(±)-Ketoprofen-d3 is intended for use as an internal standard for the quantification of (±)-ketoprofen by GC- or LC-MS. (±)-Ketoprofen is a non-selective COX inhibitor and non-steroidal anti-inflammatory drug (NSAID).1 It inhibits human recombinant COX-1 and COX-2 with IC50 values of 0.5 and 2.33 μM, respectively. In vivo, (±)-ketoprofen reduces carrageenan-induced paw edema and increases latency to paw withdrawal in the hot plate test in rats when administered using a sustained-release implant.2 Formulations containing (±)-ketoprofen have been used to treat pain and inflammation in osteoarthritis.

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