A total of 110 adults with acute ear, nose and throat infections were treated orally with 750 mg/day (n = 9) or 1500 mg/day (n = 46) sultamicillin, or 500 mg/day (n = 51) or 1000 mg/day (n = 4) cefuroxime axetil for a minimum of 5 days. Variations in dose and duration of treatment were due to severity of symptoms. After treatment with sultamicillin for 8.1 +/- 1.5 days or with cefuroxime axetil for 7.9 +/- 1.6 days, local pain, erythema, exudate, oedema and adenopathies were improved in both treatment groups and all sultamicillin-treated patients were apyretic. All sultamicillin-treated and all but three cefuroxime axetil-treated patients experienced cure or improvement; only one cefuroxime axetil-treated patient discontinued treatment due to treatment failure. Gastro-intestinal adverse events occurred in both treatment groups (eight sultamicillin-treated patients and three cefuroxime axetil-treated patients); one patient receiving cefuroxime axetil discontinued treatment due to nausea. Pruritus was reported by one sultamicillin-treated patient.