One day (24 hours) before the test, stop taking calcium channel blockers such as Calan®, Isoptin® (verapamil); Adalat®, Pro-cardia® (nifedipine); and Cardizem®(diltiazem). Also stop taking nitrate and nitroglycerin products such as Isordil® (isosorbide); Nitrobid®, Nitrodisc®, Nitrodur®, Nitrogard®, Transderm-Nitro®, and Tridil®
Twelve hours before the test, do not take sedatives such as Valium® (diazepam) or Xanax® (alprazolam).
Do not stop taking any other medication without first talking with your doctor.
Do not eat or drink anything 4 to 6 hours before the test.
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