Introduction
Oxaprozin is a non-narcotic, non-steroidal anti-inflammatory drug (NSAID), used to relieve the inflammation, swelling, stiffness, and joint pain associated with osteoarthritis and rheumatoid arthritis.
Uses
Oxaprozin is an NSAID used to treat osteoarthritis, rheumatoid arthritis, and juvenile rheumatoid arthritis.
Used to relieve the inflammation, swelling, stiffness, and joint pain associated with rheumatoid arthritis and osteoarthritis.
Associated Conditions
Pharmacodynamics
Oxaprozin is a nonsteroidal anti-inflammatory drug (NSAID) with analgesic and antipyretic properties. Oxaprozin is used to treat rheumatoid arthritis, osteoarthritis, dysmenorrhea, and to alleviate moderate pain.
Mechanism of Action
Anti-inflammatory effects of Oxaprozin are believed to be due to inhibition of cylooxygenase in platelets which leads to the blockage of prostaglandin synthesis. Antipyretic effects may be due to action on the hypothalamus, resulting in an increased peripheral blood flow, vasodilation, and subsequent heat dissipation. Oxaprozin is a non-selective NSAID, with a cell assay system showing lower COX-2 selectivity implying higher COX-1 selectivity.
Absorption
Oxaprozin is 95% absorbed after oral administration. Food may reduce the rate of absorption of oxaprozin, but the extent of absorption is unchanged. Antacids do not significantly affect the extent and rate of oxaprozin absorption.
Volume of Distribution
- 11 to 17 L/70 kg
Protein Binding
>99.5% bound to albumin
Route of Elimination
Oxaprozin is expected to be excreted in human milk based on its physical-chemical properties; however, the amount of oxaprozin excreted in breast milk has not been evaluated. Approximately 95% of oxaprozin is metabolized by the liver. Approximately 5% of the oxaprozin dose is excreted unchanged in the urine. Sixty-five percent (65%) of the dose is excreted in the urine and 35% in the feces as metabolite. Biliary excretion of unchanged oxaprozin is a minor pathway. Several oxaprozin metabolites have been identified in human urine or feces.
Half Life
54.9 hours
Toxicity
Oral, mouse: LD50 = 1210 mg/kg; Oral, rabbit: LD50 = 172 mg/kg; Oral, rat: LD50 = 4470 mg/kg
Food Interactions
- Take with food. Take once daily after breakfast. Food decreases the rate but not the extent of absorption.
Dosage
Divided doses may be tried in patients unable to tolerate single doses. For osteoarthritis patients of low body weight or with milder disease, an initial dose of one 600 mg tablet once a day may be appropriate. The maximum total daily dose is 1200 mg.
Osteoarthritis: For Osteoarthritis, the dosage is 1200 mg (two 600 mg tablets) given orally once a day.
Rheumatoid Arthritis: For Rheumatoid Arthritis, the dosage is 1200 mg (two 600 mg tablets) given orally once a day.