Thanks for writing in.
Slurring of speech is a known side effect of phenytoin
( which is the drug present in Dilantin
). It is indicative of an overdose. Please see your physician as soon as possible so that he caan modify the dosage. Also, please get the following investigations done: Complete blood count
with peripheral smear, Serum phenytoin levels. These symptoms will disappear in a few dose of reducing the dose.
I hope this helps