Skip to main content

Thallous chloride, tl-201 Side Effects

Medically reviewed by Last updated on May 2, 2022.

For the Consumer

Applies to thallous chloride, tl-201: intravenous solution

Side effects requiring immediate medical attention

Along with its needed effects, thallous chloride, tl-201 may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor or nurse immediately if any of the following side effects occur while taking thallous chloride, tl-201:

Incidence not known

  • Blurred vision
  • chest pain or discomfort
  • chills
  • confusion
  • cough
  • difficulty with breathing
  • difficulty with swallowing
  • dizziness
  • dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
  • fainting
  • fast, slow, or irregular heartbeat
  • feeling of warmth
  • fever
  • hives, itching, or skin rash
  • inability to speak
  • nausea
  • noisy breathing
  • pain or discomfort in the arms, jaw, back, or neck
  • puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
  • redness of the face, neck, arms, and occasionally, upper chest
  • seizures
  • severe or sudden headache
  • shakiness in the legs, arms, hands, or feet
  • slurred speech
  • sweating
  • temporary blindness
  • tightness in the chest
  • trembling or shaking of the hands or feet
  • unusual tiredness or weakness
  • vomiting
  • weakness in the arm or leg on one side of the body, sudden and severe

Side effects not requiring immediate medical attention

Some side effects of thallous chloride, tl-201 may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Incidence not known

  • Bleeding, blistering, burning, coldness, discoloration of the skin, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, ulceration, or warmth at the injection site
  • burning, dry, or itching eyes
  • discharge or excessive tearing
  • mild diarrhea
  • redness, pain, or swelling of the eye, eyelid, or inner lining of the eyelid

For Healthcare Professionals

Applies to thallous chloride, tl-201: intravenous solution


Frequency not reported: Hypotension[Ref]


Frequency not reported: Pruritus, flushing, diffuse rash, itching[Ref]


Frequency not reported: Nausea/vomiting, mild diarrhea[Ref]


Frequency not reported: Tremor[Ref]


Frequency not reported: Conjunctivitis, blurred vision[Ref]


Frequency not reported: Chills, fever, sweating[Ref]


Frequency not reported: Shortness of breath[Ref]


1. Cerner Multum, Inc. "Australian Product Information." O 0

2. "Product Information. Thallous Chloride Tl 201 (thallous chloride Tl-201)." GE Healthcare (2022):

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.