<prompt> The Antiepileptic drug, Phenytoin therapeutic blood level is0-9 mcgml10-19 mcgml20-29 mcgml30-39 mcgml  <response>: B 10-19 mcgml SERUM PHENYTOIN LEVELS: Therapeutic range is 10-20 mcgmL. Total phenytoin levels mcgmL - Typical corresponding Signs Symptoms: Lower than 10- Rare Between 10 and 20 - Occasional mild nystagmus Between 20 and 30 - Nystagmus Between 30 and 40 - Ataxia, slurred speech, nausea, and vomiting Between 40 and 50 - Lethargy and confusion Higher than 50 - Coma and seizures 