Thiamine Side Effects

For the Consumer

Applies to thiamine: capsule, solution, tablet, tablet enteric coated

As well as its needed effects, thiamine may cause unwanted side effects that require medical attention.

Major Side Effects

If any of the following side effects occur while taking thiamine, check with your doctor immediately:

• Coughing
• difficulty in swallowing
• hives
• itching of skin
• swelling of face, lips, or eyelids
• wheezing or difficulty in breathing

For Healthcare Professionals

Applies to thiamine: compounding powder, injectable solution, oral tablet

Local

Local side effects have included tenderness and induration at the injection site following intramuscular use.^[Ref]

Hypersensitivity

Hypersensitivity side effects have included a feeling of warmth, pruritus, urticaria, weakness, sweating, nausea, restlessness, tightness of the throat, angioneurotic edema, cyanosis, pulmonary edema, and hemorrhage into the gastrointestinal tract. Anaphylaxis has been reported, especially after repeated injection. Collapse and death have also been reported.^[Ref]

It is possible that some side effects of thiamine may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.

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