Tramadol ER 100-300 mg once daily was associated with significant improvement in pain intensity and physical function, and was well tolerated, despite the use of a fixed-dose study design not reflective of usual clinical practice. Tramadol ER is a useful treatment option for patients with osteoarthritis pain.

There was a substantial payer burden associated with OA resulting from the drug, medical, and disability costs and OA-related comorbidities and high concomitant medication utilization.

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Conditions of usual practice resulted in a high degree of non-treatment, treatment changing and multi-antipsychotic drug therapy. Patients in the risperidone group had better clinical outcomes (e.g. reduced psychiatric symptoms and side effects) and improved HRQOL. There were no significant differences in healthcare utilisation between the two study groups.