We plan to compare information that we obtained from participants who take Aptiom® and have not experienced a severe skin reaction to a group of patients who also have a history of seizure disorders and do have a history of a severe skin reaction after using Aptiom®. We will ask participants for a sample of their Deoxyribonucleic Acid (DNA). This sample can be obtained from saliva (spit). We will ask for information about skin reactions and medications. We plan to enroll about 500 individuals with a history of seizures who used Aptiom® and who did not have a severe skin reaction, and 25 participants who have used Aptiom® and experienced a severe skin reaction.

