I, also, have never heard of Neurontin being used "as needed". My husband had surgery for meningioma removal in 2004 and then CK for regrowth in October, 2007. He started having what they termed focal seizures and started on Keppra and was eventually raised to the maximum dose (3,000 mg a day). He was extremely dizzy and unbalanced on this and they switched him to Neurontin, 300 mg, three times a day. He is still having focal seizures and headaches over his eye (? sinus headaches). When they told him to increase the Neurontin to 1200 mg a day (300 x 4 pills), he once again got extremely dizzy and unsteady. Now he's backed off to the 900 mg a day (300 x 3 pills) and that symptom has gone away but still the focal seizures which are 4 to 5 minutes of his right hand (corresponds to the left-sided tumor) going numb/tingly/dead/sizzly feeling. He's getting to the point where he wants to call the neurologist and try something else. There are so many medications out there and it's just by trial and error that one that works will be found. Meanwhile the tumor has remained basically stable since the CK although the latest MRI did show part of the tumor with a minimal decrease and part with a minimal increase - so small it wasn't even measured.
Sheryl