ethosuximide /eth′ōsuk″simīd/ , an anticonvulsant drug. ▪ INDICATIONS: It is prescribed in the treatment of absence seizures. ▪ CONTRAINDICATIONS: Known hypersensitivity to this drug or to any succinimide medication prohibits its use. ▪ ADVERSE EFFECTS: Among the more serious adverse effects are blood dyscrasias, GI disturbance, and hematopoietic complications.