<qa>  What is the oral dose of amantadine hydrochloride?Patient volunteers will be asked to fast overnight prior to the day of their first scheduled chemotherapy and to ingest an oral dose of 200 mg of amantadine hydrochloride HCl in the morning within an hour of arriving in clinic. The following biological specimens will be collected: blood 2 x 10 ml at 2 and 4 hours after amantadine ingestion, saliva 2 x 5ml immediately after the blood samples, and a total urine specimen between the time of the 2 blood samples. Patient will be instructed to empty the bladder immediately before the first blood sample and then collect the total urine produced until the end of the second blood sample 4 hours. Subsequently, the patient will be allowed lunch if they so choose prior to their scheduled chemotherapy. 