Vitamin B1 Side Effects
Generic Name: thiamine
Note: This page contains side effects data for the generic drug thiamine. It is possible that some of the dosage forms included below may not apply to the brand name Vitamin B1.
It is possible that some side effects of Vitamin B1 may not have been reported. These can be reported to the FDA here. Always consult a healthcare professional for medical advice.
For the Consumer
Applies to thiamine: capsule, solution, tablet, tablet enteric coated
As well as its needed effects, thiamine (the active ingredient contained in Vitamin B1) may cause unwanted side effects that require medical attention.
If any of the following side effects occur while taking thiamine, check with your doctor immediately:Rare - Soon after receiving injection only
- difficulty in swallowing
- 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 side effects have included tenderness and induration at the injection site following intramuscular use.
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.
More about Vitamin B1 (thiamine)
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