The dose range for epilepsy is 60–320 mg/day; its very long active half-life means that for some patients, doses do not have to be taken every day,
It is occasionally still used as a sedative/hypnotic in anxious or agitated patients who may be intolerant of or do not have access to benzodiazepines, neuroleptics and other, newer drugs. For this purpose phenobarbital has a lower dose range - around 30–120 mg/day(what i would reccomend for you) but start at ONE pill; however this practice is uncommon in developed countries.