Coarsening of facial features, overgrowth of gums and acne may be a problem with prolonged use, as well as an increase in body hair. Ineffective against absences. Blurred vision, double vision, unsteadiness and nausea may occur initially or if dose is too high. Occasional rash and drowsiness may occur. May be used for partial seizures.
Weight gain can also occur.
Drowsiness and tremor are infrequent side effects. Hair loss occurs in some people, but usually minor and reversible. Liver damage very uncommon but may be serious. Blood disorders at high dose. As prescribed by the doctor.