Drug news you texted primarily increases weariness (5)
I believe the answer is:
ennui
'weariness' is the definition.
(ennui is weariness or boredom)
'drug news you texted primarily increases' is the wordplay.
'drug' becomes 'e' (E is another name for ecstasy).
'news' becomes 'nn' (n is common abbrev for new, news can be plural).
'you texted' becomes 'U' (text abbreviation for 'you').
'primarily' says to take the initial letters.
The initial letter of 'increases' is 'i'.
'e'+'nn'+'u'+'i'='ENNUI'
(Other definitions for ennui that I've seen before include "Boredom or discontent" , "Listless boredom" , "The feeling of being bored" , "Lack of interest" , "doldrums" .)