ThyroShield Side Effects
Generic name: potassium iodide
Medically reviewed by Drugs.com. Last updated on Aug 24, 2022.
Note: This document contains side effect information about potassium iodide. Some dosage forms listed on this page may not apply to the brand name ThyroShield.
Applies to potassium iodide: oral solution, oral tablet.
Serious side effects of ThyroShield
Along with its needed effects, potassium iodide (the active ingredient contained in ThyroShield) 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 as soon as possible if any of the following side effects occur while taking potassium iodide:
- joint pain
- swelling of arms, face, legs, lips, tongue, and/or throat
- swelling of lymph glands
With long-term use
- Burning of mouth or throat
- headache (severe)
- increased watering of mouth
- irregular heartbeat
- metallic taste
- numbness, tingling, pain or weakness in hands or feet
- soreness of teeth and gums
- sores on skin
- symptoms of head cold
- unusual tiredness
- weakness or heaviness of legs
Other side effects of ThyroShield
Some side effects of potassium iodide 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:
For Healthcare Professionals
Applies to potassium iodide: compounding powder, oral liquid, oral solution, oral tablet.
Hypersensitivity reactions such as skin rashes, swollen salivary glands, headache, bronchospasm and gastrointestinal disturbances can be mild or severe and may be dose dependent.
Frequency not reported: Hypersensitivity
Frequency not reported: Hyperthyroidism, iodine induced autoimmunity (Grave's and Hashimoto type), toxic nodular goiter, iodine-induced hypothyroidism, overactive thyroid gland, thyroiditis, enlarged thyroid gland with or without development or myxoedema
Frequency not reported: Stomach upset, diarrhea, nausea, vomiting, stomach pain, gastrointestinal bleeding, salivary gland swelling or tenderness
Frequency not reported: Skin rash
Frequency not reported: Pain or weakness in hands or feet, weakness or heaviness of legs
Frequency not reported: Unusual tiredness, fever, iodism (chronic iodine poisoning)
Frequency not reported: Confusion, numbness, tingling
Frequency not reported: Irregular heartbeat
More about ThyroShield (potassium iodide)
- Check interactions
- Dosage information
- During pregnancy
- FDA approval history
- Drug class: antithyroid agents
- En español
Related treatment guides
1. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
2. "Product Information. iOSAT (potassium iodide)." Anbex Inc (2019):
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.