The basic principle of psychopharmacology - is its impact on the psych
opathological syndrome, having in view its specificity, expressivity o
f negative disturbances, nozological entity. One of the approaches to
the selection of adequate psychopharmacotherapy may be the concept of
comorbidity of disturbances, determining the structure of the syndrome
and perspectives of its impact. With this in view, the structure of s
ome syndromes may be considered not as a complex of closely interrelat
ed disturbances, but as states stemming from relatively independent pa
thological disturbances, connected by probable relations. The problem
of differentiated psychopharmacotherapy in line with the phenomenon of
comorbidity at the level of symptom-syndrome, psychopathological pers
onality disturbances (including negative ones), may have a practical a
s well as a theoretical significance. An analysis of comorbid connecti
ons determines as well the selection of preventive drugs in the prophy
laxis of relapses of psychoses. An eventual study of all sides of this
problem has its goal to define the spectre of action of the already k
nown drugs and new psychopharmacological preparations, a deeper unders
tanding of psychopathology and the clinical state being under the impa
ct of psycopharmacological therapy, a transition from an extensive und
erstanding of a wide range of questions of psycopharmacology to an int
ensive study of separate facets of the problem, which seems to be most
perspective.