- Discontinuation of all medications (including over-the-counter medications and herbal supplements) except occasional paracetamol (maximum dose of 2 g/day and maximum of 10 g/2 weeks) at least 2 weeks prior to the first study drug administration. In addition, subjects must agree not to take any medications (including over-the-counter medication and herbal supplements), or alcohol during the course of the study.-non-smokers and non-users of any nicotine-containing products.