The vitamins contained in Vitamin B Complex are completely non-toxic even in high doses and usually no side effects occur. Sensitivity to Vitamin B1 however, may sometimes be encountered if administration is at prolonged intervals, irregular or if initial dose are low and suddenly increased.
Liver dysfunctions could also predispose patients to hypersensitivity reactions. Nevertheless, it must be stressed that hypersensitivity to Vitamin B1 is very rare when orally given unlike if administered by intravenous infection where hypersensitivity more often encountered.
When should the patient consult a doctor: If any undesirable effect occurs.
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