Thanks for your interest and for getting back with useful information. The medication was not prescribed by a neurologist. I've been seen by neurologist at two well-regarded teaching hospitals. The doctor at one said the chance of anything helping was "vanishingly small." The other wants me to hurry back to Pittsburgh for more tests, probably to see how fast I'm going down. But a family doctor thought the med might be worth a limited try. After three nights of trying, reading the package insert, consulting with Dr. Google and now reading your post, the test has now concluded. Thanks again.