Thiamine: Feelings of warmth, tingling, pruritus, pain, urticaria, weakness, sweating, nausea, restlessness, tightness of throat, angioedema, resp distress, cyanosis, pulmonary edema; GI bleeding, transient vasodilation & hypotension, vascular collapse & death. Pyridoxine: Nausea, headache, paresthesia, somnolence & increased serum AST (SGOT) & decreased serum folic acid conc. Cyanocobalamin: Mild transient diarrhea, peripheral vascular thrombosis, itching, transitory exanthema, urticaria, feeling of swelling of entire body, anaphylaxis & death.