[Psychotropic agents in elderly persons].

The response to narcotics, sedatives, hypnotics, antidepressants and antipsychotic drugs is modified in elderly patients. The effects of these drugs are enhanced, and dosage reduction is required. This phenomenon is gradual and occurs before any sign of senile dementia. The choice of a drug within a therapeutic class may depend on the severity of adverse reactions, some of which are particularly disturbing in elderly patients.