If you have any questions or concerns, call the Cardiac Catheterization Laboratory any time at 212-241-5881 and ask to speak to a nurse practitioner. We will be glad to assist you. If any medication side effects develop or change in intensity, contact your doctor as soon as possible. And if you have symptoms such as chest pain, palpitations, shortness of breath, or difficulty breathing, immediately call your doctor, call 911, or go to the closest emergency room.