- Any medication taken listed in Prior and Concomitant Medication section including over-the-counter medications and herbal products within 21 days of commencing study drug dosing with the exception of vitamins and/or paracetamol and/or hormonal contraceptives including the combined oral contraceptive pill, Depo-Provera and the Mirena intrauterine system. When a concomitant medication is necessary, this will be reviewed by the Investigator and if not contraindicated, may be continued at the same dose and frequency during the study period.