Fifteen patients with chronic otitis media, where the organism cultured was Pseudomonas aeruginosa, had previously been treated with a variety of antibiotics, ear drops and surgical procedures. In 8 patients the discharge persisted. Between October 1986 and August 1987 these patients were treated with a combination of antibiotics (including piperacillin, ceftriaxone, amikacin and tobramycin) specific for Pseudomonas administered intravenously. In 7 patients the infection cleared completely. Follow-up ranged from 1 month to 1 year (average 4.5 months). The regimen described could be of value in patients who do not respond to standard methods of treatment.