Let Dr. Jones know if you have a pacemaker or implantable heart defibrillator, a history of bleeding problems, dilated blood vessels, and any other previously known problems with your esophagus.

• Seven days before the monitoring period, do not take proton pump inhibitors such as omeprazole (Prilosec®), lansoprazole (Prevacid®), rabeprazole (Aciphex®), pantoprazole (Protonix®), esomeprazole (Nexium®), or as instructed by Dr. Jones
• Two days (48 hours) before the monitoring period, do not take the H2 blockers ranitidine (Zantac®), cimetidine (Tagamet®), famotidine (Pepcid®), nizatidine (Axid®); or the promotility drug, metoclopramide (Reglan®)
• Six hours before the monitoring period, do not take antacids (such as Alka-Seltzer®, Gaviscon®, Maalox®, Milk of Magnesia®, Mylanta®, Phillips®, Riopan®, Tums® or any other brands)
• Four to 6 hours before your appointment do not eat or drink