You should not use this medicine if you have had an allergic reaction to regadenoson, or if you have certain heart problems (such as heart block or a sinus node disorder) and do not have a pacemaker that is working.
Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.
Make sure your doctor knows if you are using dipyridamole (Persantine®) before you receive this medicine. You may need to stop using dipyridamole for at least two days before the test.
Make sure your doctor knows if you are using theophylline (Theo-24®, Uniphyl®) before you receive this medicine. You may need to stop using theophylline for at least twelve hours before the test.
Do not take anything that contains caffeine for at least twelve hours before you receive this medicine. This includes medicines, foods, and beverages with caffeine, such as coffee, tea, and cola drinks.
Make sure your doctor knows if you are pregnant or breastfeeding, or if you have low blood pressure, breathing problems, or certain lung diseases (such as asthma or chronic obstructive pulmonary disease [COPD]).
Tell your doctor right away if you start having chest pain, trouble with breathing, lightheadedness, or if you feel faint after this medicine is injected. You may be having a serious side effect from this medicine.