Dose reduction of Phenytoin therapy is indicated if plasma levels are if symptoms persist, termination is recommended. Phenytoin blood levels, liver function tests should be performed periodically to monitor your progress or check for side effects. If the rash is exfoliative, purpuric, or bullous or if lupus erythematosus, Stevens-Johnson syndrome, or toxic epidermal necrolysis is suspected, use of this drug should not be resumed and alternative therapy should be considered. For time periods less than one week, the patient shifted back from IM administration should receive one half the original oral dose for the same period of time the patient received IM phenytoin. Any worsening of mood, or koper phenytoin inget recept lag kostnad thoughts of suicide or dying should be reported to your health care professional right away.