Reviewed on 9/26/2022

What Is Regadenoson and How Does It Work?

Regadenoson is given in preparation for a radiologic (x-ray) examination of blood flow through the heart to test for coronary artery disease.

  • Regadenoson is available under various brand names: Lexiscan 

What Are Side Effects Associated with Using Regadenoson?

Common side effects of Regadenoson include:

  • trouble breathing.
  • headache, dizziness.
  • chest pain or discomfort.
  • nausea; or
  • flushing (warmth, redness, or tingly feeling).

Serious side effects of Regadenoson include:

  • hives. 
  • difficulty breathing. 
  • swelling of the face, lips, tongue, or throat.
  • severe dizziness, fast heartbeats, and warmth or a tingly feeling.
  • wheezing, chest tightness, trouble breathing.
  • weak or shallow breathing.
  • chest pain or pressure, pain spreading to your jaw or shoulder.
  • a seizure.
  • low blood pressure--a light-headed feeling.
  • high blood pressure--a severe headache or pounding in the neck or ears.
  • signs of a stroke--sudden numbness or weakness (especially on one side of the body), severe headache, slurred speech, balance problems.

Rare side effects of Regadenoson include:

  • none

Seek medical care or call 911 at once if you have the following serious side effects:

  • Severe headache, confusion, slurred speech, arm or leg weakness, trouble walking, loss of coordination, feeling unsteady, very stiff muscles, high fever, profuse sweating, or tremors;
  • Serious eye symptoms such as sudden vision loss, blurred vision, tunnel vision, eye pain or swelling, or seeing halos around lights;
  • Serious heart symptoms such as fast, irregular, or pounding heartbeats; fluttering in the chest; shortness of breath; sudden dizziness, lightheadedness, or passing out.

This is not a complete list of side effects and other serious side effects or health problems that may occur because of the use of this drug. Call your doctor for medical advice about serious side effects or adverse reactions. You may report side effects or health problems to FDA at 1-800-FDA-1088.


Heart Disease: Symptoms, Signs, and Causes See Slideshow

What Are Dosages of Regadenoson?

Adult dosage

Intravenous solution

  • 0.4 mg/5 mL

Myocardial perfusion imaging

Adult dosage

  • Intravenous: 0.4 mg as a single dose.

Dosage Considerations – Should be Given as Follows: 

  • See “Dosages”

What Other Drugs Interact with Regadenoson?

If your medical doctor is using this medicine to treat your pain, your doctor or pharmacist may already be aware of any possible drug interactions and may be monitoring you for them. Do not start, stop, or change the dosage of any medicine before checking with your doctor, health care provider, or pharmacist first.

  • Regadenoson has severe interactions with no other drugs.
  • Regadenoson has serious interactions with the following drugs:
  • Regadenoson has moderate interactions with no other drugs.
  • Regadenoson has minor interactions with no other drugs.

This information does not contain all possible interactions or adverse effects. Visit the RxList Drug Interaction Checker for any drug interactions. Therefore, before using this product, tell your doctor or pharmacist about all your products. Keep a list of all your medications with you and share this information with your doctor and pharmacist. Check with your health care professional or doctor for additional medical advice, or if you have health questions or concerns.

What Are Warnings and Precautions for Regadenoson?


  • Allergic to regadenoson
  • 2nd or 3rd degree AV block; or
  • "Sick sinus syndrome" (unless you have a pacemaker).

Effects of drug abuse

  • None

Short-Term Effects

  • See “What Are Side Effects Associated with Using Regadenoson?”

Long-Term Effects

  • See “What Are Side Effects Associated with Using Regadenoson?”


  • Receiving regadenoson may increase your risk of having abnormal heartbeats, breathing problems, heart attack, stroke, or cardiac arrest. Talk to your doctor about your specific risk.
  • Avoid drinking coffee or other beverages with caffeine for at least 12 hours before your stress test.

Pregnancy and Lactation

  • It is not known whether regadenoson will harm an unborn baby. Tell your doctor if you are pregnant.
  • Lactation
    • Do not breastfeed within 10 hours after receiving regadenoson. If you use a breast pump during this time, throw out any milk you collect. Do not feed it to your baby.


In the U.S., 1 in every 4 deaths is caused by heart disease. See Answer

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