Efficacy and Safety of Diclofenac Potassium 25 mg Tablet Taken Three Times Daily in Subjects With Acute Joint Pain

Inclusion Criteria: * Male or female aged 18 years and over. * Acute sprain of the lateral ankle, Grade I-II, meeting baseline pain intensity level. * Injury within past 12 hours. Exclusion Criteria: * Pain medication was taken within the 6 hours that precede randomization. * During the past 3 months: Grade I-III sprain of the same ankle. * During the past 6 months: Grade II-III sprain, any other significant injury (such as fracture or torn ligament), or surgery (except for skin or nails) of the same ankle or foot. * Pain or instability in the same ankle attributable to previous ankle sprain or any other trauma. * Ankle sprain attributable to a known disease affecting the ligaments, such as ligament hyperlaxity due to connective tissue disease (e.g., Marfan's syndrome, Down's syndrome, Ehlers-Danlos syndrome).