July 25, 2016
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Thallous Chloride

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Thallous Chloride Tl-201 Injection

Thallous Chloride Side Effects Center

Medical Editor: John P. Cunha, DO, FACOEP

Last reviewed on RxList 5/06/2016

Thallous Chloride Tl-201 Injection is a diagnostic radiopharmaceutical used in myocardial perfusion imaging using either planar or SPECT (Single Photon Emission Computed Tomography) techniques for the diagnosis and localization of myocardial infarction, in conjunction with exercise stress testing as an adjunct to the diagnosis of ischemic heart disease (atherosclerotic coronary artery disease), for scintigraphic imaging of the myocardium to identify changes in perfusion induced by pharmacologic stress in patients with known or suspected coronary artery disease and who cannot exercise adequately, and also for the localization of sites of parathyroid hyperactivity in patients with elevated serum calcium and parathyroid hormone levels. Thallous Chloride Tl-201 Injection is available in generic form. Common side effects of Thallous Chloride Tl-201 Injection include:

The recommended adult dose of intravenous Thallous Chloride Tl-201 for planar myocardial imaging is 37 to 74 MBq (1 to 2 mCi). The recommended intravenous doses for SPECT myocardial imaging are 74 to 111 MBq (2 to 3 mCi). Thallous Chloride may interact with other drugs. Tell your doctor all medications and supplements you use. During pregnancy, Thallous Chloride should be used only if prescribed. It is unknown if this drug passes into breast milk. Consult your doctor before breastfeeding.

Our Thallous Chloride Tl-201 Injection Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What is Prescribing information?

The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.

Thallous Chloride FDA Prescribing Information: Side Effects
(Adverse Reactions)


Following the administration of Thallous Chloride Tl-201, adverse anaphylactoid reactions have been reported (characterized by cardiovascular, respiratory and cutaneous symptoms), some severe enough to require treatment. Hypotension, pruritus, flushing, and diffuse rash which responds to antihistamines have been reported. Other reported events include itching, nausea/vomiting, mild diarrhea, tremor, shortness of breath, chills, fever, conjunctivitis, sweating, and blurred vision.

Adverse events, some of which were serious, have also been reported in patients who have undergone thallium pharmacologic testing (see WARNINGS). Please refer to the package inserts of approved pharmacologic stress agents for more detailed information on those adverse reactions.

Read the entire FDA prescribing information for Thallous Chloride (Thallous Chloride)

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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