Hello: My daughter is Down Syndrome and had a seizure, Dr, gave her Keppra,, she is hallucinating and irritable. Taking 500 mg twice a day, there is another drug called Dechprote (sp?), Our MD said that was milder,,,,250 grams twice a day. Should we change gradually to this second drug mentioned? My daughter is 51 and very small...weighing only about 110,