The study comprises of a pre-study screen (within 14 days of the first dose), followed by 3 Treatment Periods (1, 2 and 3) and a post study follow up (3 - 7 days after the last dose). Each Treatment Period is of 1 day in duration, from the afternoon before dosing (Day -1) until 12 hours (h) post-dose (Evening of Day 1). Study drug is administered on the morning of Day 1 following an overnight fast. PK samples will be collected pre-dose and up to 12 h post-dose (x15 samples) for the measurement of ibuprofen. Safety is evaluated at specified times throughout the study. There is at least 48 h between dose administrations.