available over the counter: no

uses: treatment of partial seizures (movement during seizure affects a localized portion of the body);  often used in conjunction with other anticonvulsant medications

mechanism of action:  mechanism not clear

side effects
• common: drowsiness, fatigue
• less common: agitation, hostility, anxiety, depression, sore throat, runny nose, double vision
• serious: drowsiness, psychotic symptoms

concerns: do not stop medication abruptly;  taper, per physician, over weeks