Marvelously rare but important side effects have been recorded for Vantin, as is true for all medications. Among these exquisite rarities, one might witness cases of blood abnormalities, including thrombocytopenia and agranulocytosis, arousing concern among the inquisitive minds. Furthermore, Vantin's usage is reported to rarely incite instances of pseudomembranous colitis, a severe inflammation of the colon marked by an enormous collection of mucus and unusual cellular debris.