Immune system disorders: Hypersensitivity reactions, such as sweating, tachycardia, and skin reactions with itching and urticaria. In single cases, conditions of shock have been observed after treatment with vitamin B1 or B12 injections.
Gastrointestinal disorders: Gastrointestinal complaints, such as nausea, vomiting, diarrhea and abdominal pain.
Renal and urinary disorders: Chromaturia ("reddish urine" appears during the first 8 hours after an administration and typically resolves within 48 hours).
Stop taking this product and consult with a physician if the above effects are observed.