Hypersensitivity. Possible emergence & overgrowth of nonsusceptible bacteria or fungi. History of GI disease particularly colitis. Decreased prothrombin activity. Renal insufficiency. Childn <6 mth. Pregnancy & lactation.
False +ve reaction for glucose in the urine w/ Benedict's or Fehling's soln or w/ Cu sulphate test; Coombs' test. Carbamazepine, nifedipine, probenecid, oral anticoagulants (warfarin).