Diclofenac is a non-selective COX inhibitor with IC50 of 60 and 220 nM for ovine COX-1 and -2, respectively. It inhibits human COX-1 and -2 with IC50 values of 0.9-2.7 and 1.5-20 uM, respectively. It is thought that the primary mechanism responsible for its anti-inflammatory, antipyretic, and analgesic action is inhibition of prostaglandin synthesis by inhibition of cyclooxygenase (COX), and it appears to inhibit DNA synthesis.
Molecular Weight | 318.13 |
Formula | C14H10Cl2NNaO2 |
CAS Number | 15307-79-6 |
Solubility (25°C) | DMSO 60 mg/mL |
Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
Animal A Km |
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
[4] Paul L McCormack, et al. Diclofenac sodium injection (Dyloject): in postoperative pain
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