De or het psychofarmacologie?

The correct Dutch article is:

de psychofarmacologie

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

How to use psychofarmacologie

the psychofarmacologiede psychofarmacologie
this psychofarmacologiedeze psychofarmacologie
that psychofarmacologiedie psychofarmacologie
our psychofarmacologieonze psychofarmacologie
your psychofarmacologiejouw psychofarmacologie
every psychofarmacologieelke psychofarmacologie
which psychofarmacologie?welke psychofarmacologie?
a big psychofarmacologie / the big psychofarmacologieeen grote psychofarmacologie, de grote psychofarmacologie

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