hi there, just a tid-bit from my mom (she reads some of this too but never posts) she calls lyrica her miracle drug as she has had everything for pain including morphine (she has fibromyalgia) and nothing was able to stop the constant pain as Lyrica did, although the lyrica replaced the 2400mg of Neurontin (not sure if the being on a med already to another lessened, if not eliminated all side effects) however she is a much better functioning person since being on Lyrica, some days prior to this med she couldnt even get out of bed, now as long as she stays on track with taking this med (WITHDRAWAL IS NOT GOOD) she is able to do the regular day to day functions in life. I do notice that sometimes if she is already tired, the lyrica seems to make her sleepy rather rapidly but usually only the evening dose.but otherwise she wouldnt be the same without this med, then again everyone is different!

As a footnote she currently takes 150mg 2 x daily, but started on 1/2 that dosage approximately 1 year ago, i am not aware of what is a high or low dosage im just adding what hers is incase it might be helpful to you.
BUT she has fibromyalgia, not trigeminal neuraligia... GOOD LUCK!!