A generalized myoclonic-atonic seizure is a type of generalized motor seizure characterized by a myoclonic jerk followed by an atonic motor component. The phenotype is Human Phenotype Ontology entry HP_0011170 (Generalized myoclonic-atonic seizure). Also known as: Generalised myoclonic-atonic seizure, Myoclonic atonic seizures, Myoclonic-astatic seizure.