<qa>  What is the name of the drug that is a potential enzyme inducer?- Unable to refrain from the use of prescription or non-prescription drugs, including vitamins, herbal and dietary supplements including St Johns Wort within 7 days or 14 days if the drug is a potential enzyme inducer or 5 half-lives whichever is longer prior to the first dose of study medication, unless in the opinion of the investigator the medication will not interfere with the study procedures or compromise subject safety. 