Hey, I know what you mean!
The trick is to be patient! If your beardie doesn't like the taste of the meds, maybe you can dilute in la little bit of juice to make her lick and open enough her mouth for you to stick the seringe tip (or whatever device you're using).
In my case, five alive did the job. The quantity of juice I gave was like 0.05 ml, just enough to get the mouth open (procedure vet-approved!)