My keppra (levetiracetam) level is 78 is that dangerous i am taking 4000 mg daily.

Tx range 5-30 µg/mL: Per aruplab.Com, the proposed range is well below 78, assuming you are referring to this same scale. Notice the word "proposed". Why? Because no one really knows & the issue is always the fantastic complexity of individual response; also the reason your primary doctor (like it or not, good at it or not) is yourself. Other people are focusing on their perspective & guessing, perhaps better educated.