Quick query roughly speaking this medication?

Doing a research project & can't seem to find this... the question is Promethazine/Phenegren toxic in long possession usage? Just the meds by itself

Answers:

It might cause tardive dyskinesia, (uncontrolled movements of tongue and lips that continue even when the drug intake is stopped).

see the following knit for further details:

http://www.merck.com/mmpe/lexicomp/prome…