Complex febrile seizure (HP_0011172) is a febrile seizure that has any of the following features: focal semiology (or associated with post-ictal neurologic abnormalities beyond drowsiness, such as a Todd's paresis), prolonged seizure beyond 15 minutes, or recurring (occurring more than once) in a 24 hour period. Also known as: Complex febrile convulsion, Complex febrile seizures, Complex fever fit.