History of hypersensitivity reactions to penicillins, cephalosporins or other allergens. Not to be used in patient w/ known hypersensitivity. Discontinue treatment if erythema rash, irritation or edema; flu-like symptoms; signs of SJS [eg, fever, rash, bullae, exfoliation of skin & other mucous membranes (eg, mouth, throat, nose, genitalia), or conjunctivitis] occur. Overgrowth of non-susceptible organisms w/ prolonged use. May cause cholestatic jaundice or rise of hepatic enzyme (cause hepatic dysfunction). Maintain adequate fluid intake during high-dose treatment to reduce possibility of amoxicillin crystalluria. Monitor hepatic function at regular intervals. Increased effect of warfarin in prolongation of prothrombin time w/ concomitant use. Not to be given in severe renal impairment (GFR <30 mL/min). Not recommended in hepatic impairment. Avoid use in pregnancy (especially during 1st trimester). Lactation.