Shock or anaphylaxis; serious colitis w/ bloody stool eg, pseudomembranous colitis; TEN or muco-cutaneo-ocular syndrome (SJS); interstitial pneumonia, pulmonary interstitial emphysema (PIE) syndrome; hepatic function disorder; serious renal disorder eg, acute renal failure; agranulocytosis or hemolytic anemia; hypoglycemia accompanying hypocarnitinemia. Diarrhea, loose stool, queasy, stomach discomfort, abdominal pain; rash; increased AST & ALT count; eosinophilia.