frequent seizures do I have a drug interaction? age 68....weight 140lbs....female....have had a mild heart attack...kidney failure 2 years ago....not on dialysis lorazepam .5, metoprolol 25 mg, levothyroxine sodium 125mg, forosenude 40mg, rocaltrol .25, niacin 100mg,prevastatin 40mg, keppra 250mg x3 per day, iron, Tylenol 500mg