I have trilgimal nerugia I'm on gabapintin dilanta just started tegretol 100 chewable. My blood levels on dilanta was 4.5 is it still working?

Combination. The combined use of tegretol and Dilantin is tricky and should be guided by a neurologist who is most used to using two antiseizure medications simultaneously. The usual therapeutic level of Dilantin is 10to20 but it can lower the serum level of tegretol and perhaps you're recommended to take a lower dose because of this effect on tegretol.