Which of the following is an antiepileptic medication associated with significant hypersensitivity reactions?

Cephalexin is a cephalosporin antibiotic that can cause allergic reactions, but it is not classified as an antiepileptic medication. While hypersensitivity reactions can occur, they are generally milder and less frequent compared to those associated with carbamazepine. Therefore, it does not fit the criteria of an antiepileptic medication with significant hypersensitivity reactions.

Tacrolimus is an immunosuppressant often used in organ transplant patients. Although it can lead to side effects, including allergic reactions, it is not an antiepileptic medication. Its hypersensitivity reactions are less characteristic and not as pronounced as those seen with carbamazepine.

Trazodone is primarily an antidepressant medication and is not used as an antiepileptic. While it can cause some side effects, including potential allergic reactions, it lacks the significant hypersensitivity profile associated with carbamazepine in the context of epilepsy treatment.