- Intake of any enzyme-modifying drugs such as cimetidine, theophylline, benzodiazepines, ranitidine, proton pump inhibitors, erythromycin, diuretics, ketoconazole, anti hypertensive drugs, dopamine agonists, etc within 30 days of study drug administration, or administration/ intake of any prescription or OTC drug including vitamins and natural supplements within 30 days of study drug administration. In such cases, enrolment of the subject in the study will be at the discretion of the Principal Investigator/designee.