RCT, Blinded, 2-Arm Efficacy Study of IP and Placebo in Patients With Chronic Pain Related to Osteoarthritis of the Knee

The 800mg ibuprofen sustained-release tablet is the same as the next generation of ibuprofen sustained-release tablets developed by foreign pharmaceutical companies, but does not contain a placebo that the active ingredient of ibuprofen

Medication: ibuprofen modified sustained release tablets 800 mg Ibuprofen sustained Release Tablet 800mg is a new generation of ibuprofen developed by overseas pharmaceutical companies. It works fast and lasts for up to 12 hours. The dosing regimen was twice daily, 12 hours apart. Ibuprofen :2-\[4-(2-methylpropyl) phenyl\] propionic acid, nonselective nonsteroidal anti-inflammatory drug (NSAID).