Polypharmacy is the rule in psychogeriatric patients, as they present frequently comorbidities such as depression, dementia [often including Behavioral and Psychological Symptoms of Dementia (BPSD)] and somatic diseases. Recommended treatments for geriatric depression are antidepressant medications, psychotherapy and psychosocial interventions [1]. Besides antidepressants, other psychotropic drugs are often co-prescribed, but somatic drugs are also needed for the treatment of other concomitant diseases. This situation increases the risk for adverse effects due to pharmacokinetic and pharmacodynamic interactions, especially since the organism of elderly patients displays a lowered homeostatic reserve and a decrease of functions, which allows resisting to xenobiotic influences.

On the other hand, there are also studies which suggest that in hospitalized psychogeriatric patients, the incidence of severe adverse reactions is lower in patients > 60 y than in those < 60 y [2]. This is one of the results of the AMSP-study group, which in German speaking countries has developed a pharmacovigilance program in psychiatric hospitals.