“…thiamine in 989 patients and found 'minor reactions' (burning at injection site) in 11 patients and one case of generalized pruritus, indicating that thiamine administration is generally safe. However, anaphylactic responses do occur occasionally when B vitamins are given orally, i.v., i.m., or s.c., but are most often seen after multiple administrations when given i.v., on 'the end of a needle', as opposed to by an infusion over 30 min (Laws, 1941;Schiff, 1941;Stiles, 1941;Leitner, 1943;Reingold and Webb, 1946;Assem, 1973;Stein and Morgenstern, 1994).…”