A survey of 5 year period activity (1995-99) of a university consultation-liaison service is reported, concerning 1556 psychiatric consultations. The majority of referrals (68%) came from internal medicine units; the reason of referral was prevalently due (approx. 50%) to the presence of psychiatric symptoms; moreover, the majority of patients (approx. 51%) for which the consultation has been requested were already under psychiatric treatment and 32% of them took psychoactive drugs. In 75% of cases a psychiatric diagnosis according to ICD-10 was formulated after consultation: "Affective syndromes" were diagnosed in 25% of cases and "Neurotic, somatoformand stress-related syndromes" in 36.6% of cases. Approx. 60% of patients were prescribed psychoactive drugs; 50% received psychological support.