<qa>  What is the name of the drug used to treat grape fruit juice?- Use of following drugscompounds: cyclosporine, itraconazole, ketoconazole, erythromycin, clarithromycin, HIV protease inhibitors, nefazodone, gemfibrozil, niacin, amiodarone, verapamil or large quantities of grape fruit juice 1 quart per day 