Thallous chloride tl 201 (Injection)


Thallous Chloride Tl 201 (THAL-us KLOR-ide TI 201)

Helps diagnose a heart attack or blocked arteries of the heart during planar scintigraphy or single-photon emission computed tomography (SPECT) scan. Also helps diagnose parathyroid problems.

Brand Name(s)

When This Medicine Should Not Be Used

How to Use This Medicine


  • A doctor or other trained health professional will give you this medicine. It is given through a needle placed in one of your veins just before you have a planar scintigraphy or SPECT scan.
  • Your doctor may ask you not to eat or drink anything for several hours before your test.
  • You may be asked to sit upright while you receive your injection.
  • Your planar scintigraphy or SPECT scan will be performed 10 to 20 minutes after you receive this medicine.

Drugs and Foods to Avoid

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

Warnings While Using This Medicine

  • Make sure your doctor knows if you are pregnant or if you have heart rhythm problems, high or low blood pressure, breathing or lung problems, or a history of heart attack or stroke.
  • Do not breastfeed for 2 weeks after you receive this medicine.
  • You may receive a medicine to make your heart beat faster. This is called a pharmacologic stress test. The stress test is used together with the planar scintigraphy or SPECT scan to show how well your heart muscle works when it is stressed. Talk to your doctor if you have questions about this test.
  • Tell your doctor right away if you have a mild burning pain, a feeling of warmth or coldness, or redness at the injection site.
  • This medicine may cause a serious type of allergic reaction called anaphylaxis. Check with your doctor or nurse right away if you have cold, clammy skin; confusion; dizziness; lightheadedness; a skin rash; itching; sweating; swelling of the face, tongue, or throat; trouble with breathing; or chest pain after you receive the medicine. Anaphylaxis can be life-threatening and requires immediate medical attention.
  • You will be exposed to radiation when you receive this medicine. Talk to your doctor if you have any questions about this.
  • The vial stopper contains dry natural rubber, which may cause allergic reactions in people who are sensitive to latex. Tell your doctor if you have a latex allergy before you receive this medicine.
  • Your doctor will check your progress very closely while you are receiving this medicine. This will allow your doctor to see if the medicine is working properly.

Possible Side Effects While Using This Medicine

Call your doctor right away if you notice any of these side effects:

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
  • Chest pain
  • Fast, slow, or pounding heartbeat
  • Fever or chills
  • Lightheadedness or fainting
  • Shortness of breath
  • Tremors

If you notice these less serious side effects, talk with your doctor:

  • Blurred vision
  • Increased sweating
  • Nausea, vomiting, or diarrhea
  • Red, irritated eyes
  • Skin rash or itching
  • Warmth or redness in your face, neck, arms, or upper chest

If you notice other side effects that you think are caused by this medicine, tell your doctor

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088

Version Info

  • Last reviewed on 8/4/2014

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