<p>There have been rare reports of anaphylactic reactions following parenteral multivitamin administration. Rare reports of anaphylactic reactions have also been reported after large intravenous doses of thiamine. The risk is negligible if thiamine is co-administered with other vitamins in the B group. There have been rare reports of the following types of reactions:- rash, erythema, pruritus, headache, dizziness, agitation, anxiety, diplopia, urticaria, shortness of breath, wheezing, and angioedema.</p>