Severe allergic reaction in penicillin-allergic patients. Not to be used in patients w/ history of hypersensitivity to cephem or penicillin antibiotics. Patients w/ personal or familial predisposition to allergic reactions eg, bronchial asthma, rash or urticaria. Discontinue treatment if fever, rashes, blisters, skin peeling, stomatitis, pharyngitis, rhinitis, conjunctivitis, genital inflammation occur; any abnormalities eg, feeling unwell, oral cavity discomfort, stridor, vertigo, defecation desire, tinnitus or diaphoresis are observed; abdominal pain or frequent diarrhea occurs; interstitial pneumonia or pulmonary interstitial emphysema syndrome w/ fever, cough, dyspnea, abnormal chest X-ray, eosinophilia occurs. Carefully observe patients w/ poor oral food intake or who are receiving parenteral alimentation, & in poor general health. Monitor patients w/ abnormal lab test values (increased AST & ALT, eosinophilia) in patients under long-term treatment by performing periodic lab tests. Vit K deficiency may develop. Shock. Limit duration of treatment to min period to prevent emergence of drug-resistant microorganisms. Prolong dosing interval in patients w/ severe renal function disorder. Hypocarnitinemia in women taking antibiotics containing pivoxil group during last trimester of pregnancy, as well as in neonates born to them. Not to be administered in ped patients found to have inborn errors of metabolism which may cause serum carnitine to decrease. Hypoglycemia accompanying hypocarnitinemia in childn particularly infants & small childn. Blood conc may increase in elderly patients w/ renal hypofunction. Bleeding tendency due to vit K deficiency in the elderly. 100 & 200 mg tab: Agranulocytosis or hemolytic anemia. Hepatic function disorder; serious renal disorder eg, acute renal failure. 200 mg tab: Patients who are hypersensitive to casein. Minor or moderate influence on ability to drive & use machines. Not recommended during lactation.