Paracetamol is recommended as first line treatment for pain control in osteoarthritis, but it is not included in list of drugs than can be prescribed in charge of National Health System by General Practitioners. The hypothesis is that removing this economical barrier the investigators can decrease the prescription of NSAID and of the Proton Pump Inhibitors (PPI), often given for gastric bleeding prophylaxis in NSAID chronic users. As secondary outcome, opioids use was also monitored to see.