- An unusual diet, for whatever reason e.g. low sodium diet, for two weeks prior to receiving any medication and through out subject's participation in the study. Consumption of grapefruit-containing food or beverages within 7 days prior to receiving the first dose of study medication in both the periods Recent history of dehydration from diarrhoea, vomiting or any other reason within a period of 24 hours prior to the study. Female volunteers demonstrating a positive pregnancy screen or currently breast-feeding.