A child was started on an antiseizure drug 6 weeks ago. The nurse notes that the patient's serum blood level of the antiseizure drug is very low. How will the nurse interpret this result?
1) The client may not be taking the drug regularly as ordered
2) The client is taking too much or a toxic amount of the drug
3) This antiseizure drug is not effective, and the client should be placed on a different antiseizure drug
4) The client is experiencing an allergic reaction to the drug