Go ahead and take the HUMAWORM. The parasites may not be totally gone, but you've probably got them on the run! I need to know if your daughter will be taking the HUMAWORM For Children or the HUMAWORM For Adults. The formulations are different - Hyssop is not in the children's formula and it is the only herb that MIGHT have a contradiction with the Keppra. There is, of course, no clinical data for this contradiction. Hyssop contains an essential hormone oil which is very effective in destroying a variety of parasites and is very effective against the herpes simplex virus, but the chemical way in which it works to kill parasites might interfere. She may safely take the HUMAWORM For Children - even if she's over 150 pounds, she can take 1 capsule for every 30 pounds of body weight. Our formulas are based on blood volume levels, not age. Thank You!