"my doctor prescribed dilantin for anxiety and depression.  it seems to work just about 60 to 70% of the time for both conditions.  other times i can&#039;t really tell the difference.  i use 1 or 2 - 100 mg capsule(s) a day or only as needed.  i like that it is not habit forming and tolerance is not built up.  side effects need to be looked at, although i don&#039;t experience any serious adverse effects.  extra vitamin b-12 and folic acid needs to be taken while taking dilantin because it may cause a deficiency with these nutrients."