De or het farmacopsychologie?

The correct Dutch article is:

de farmacopsychologie

Rule Words ending in -logie: always de. See the rule
Meaning (Dutch) (psychologie) studie van de werking van geneesmiddelen op de menselijke geest

How to use farmacopsychologie

the farmacopsychologiede farmacopsychologie
this farmacopsychologiedeze farmacopsychologie
that farmacopsychologiedie farmacopsychologie
our farmacopsychologieonze farmacopsychologie
your farmacopsychologiejouw farmacopsychologie
every farmacopsychologieelke farmacopsychologie
which farmacopsychologie?welke farmacopsychologie?
a big farmacopsychologie / the big farmacopsychologieeen grote farmacopsychologie, de grote farmacopsychologie

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).