All of the following statements about phenytoin are true except:
Phenytoin is not a CNS depressant; some sedation occurs at therapeutic doses, but this does not increase fuher with dose; rather toxic doses produce excitement and muscular rigidity. REF: ESSENTIALS OF MEDICAL PHARMACOLOGY KD TRIPATHI 8TH ED.
It follows Saturation kinetics
Anti-seizure activity closely resembles plasma concentration
Does not depress CNS
Cerebellar degeneration occurs on long-term administration
Central Nervous system