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Antidotum Thallii-Heyl Side Effects

Generic name: prussian blue

Medically reviewed by Last updated on Sep 8, 2022.

Note: This document contains side effect information about prussian blue. Some dosage forms listed on this page may not apply to the brand name Antidotum Thallii-Heyl.

Applies to prussian blue: oral capsule.

Serious side effects

Along with its needed effects, prussian blue (the active ingredient contained in Antidotum Thallii-Heyl) 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 immediately if any of the following side effects occur while taking prussian blue:

More common

  • Convulsions
  • decreased urine
  • difficulty having a bowel movement (stool)
  • dry mouth
  • increased thirst
  • irregular heartbeat
  • loss of appetite
  • mood changes
  • muscle pain or cramps
  • nausea or vomiting
  • numbness or tingling in the hands, feet, or lips
  • shortness of breath
  • unusual tiredness or weakness

Other side effects

Some side effects of prussian blue 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

  • Blue colored stools

For Healthcare Professionals

Applies to prussian blue: oral capsule.


The most common adverse event was constipation.[Ref]


Very common (10% or more): Constipation (24%)

Frequency not reported: Gastrointestinal motility decreased, stools blue color, oral mucosa and dentition colored blue[Ref]


Common (1% to 10%): Hypokalemia[Ref]

Frequently asked questions

More about Antidotum Thallii-Heyl (prussian blue)

Patient resources

Other brands


Professional resources

Related treatment guides


1. "Product Information. Radiogardase (Prussian blue)." Heyl Chemisch Pharmaceuticals (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.