Rapid infusion: Anaphylactoid reactions, including hypotension, wheezing, dyspnea, urticaria, or pruritus; flushing of the upper body (''red neck'') or pain & muscle spasm of the chest & back. Increased serum creatinine or BUN conc. Pseudomembranous colitis. Ototoxicity. Neutropenia. Inflammation at the inj site. Anaphylaxis, drug fever, nausea, chills, eosinophilia, rashes including exfoliative dermatitis, linear IgA bullous dermatosis, SJS, TENS & vasculitis.