Before using this medication, tell your doctor or pharmacist your medical history, especially of: personal or family history of glaucoma (angle-closure type), overactive thyroid, other heart problems (e.g., coronary heart disease, congestive heart failure, fast heartbeat, arrhythmias), high blood pressure, kidney disease, heartburn problems (acid reflux, hiatal hernia), certain nervous system problem (autonomic neuropathy), myasthenia gravis.