Each subject will receive each treatment over two separate treatment periods under fasting conditions. Each dosing day for male subjects will be separated by a washout period of at least 7 days. The study will comprise of a pre-study screen (within 14 days of the first dose), followed by 2 Treatment Periods (1 and 2). During each treatment period, subjects will reside at Simbec from the evening before dosing (Day 1), until at least 36 h post dose (evening of Day 2). On admission (Day -1), subjects will provide a urine sample for a drugs of abuse screen; this sample will also be tested to confirm a negative pregnancy result in female volunteers.