Generalized tonic clonic seizures are characterized by overactivity of the brain, which leads to loss of consciousness.  Emfit NZ The condition may be life-threatening and can be caused by a variety of medical conditions.Typically, the duration of the seizure lasts for only a few minutes. However, it may last longer. Seizures lasting more than five minutes can be a sign of a life-threatening medical emergency.During a tonic clonic seizure, the person's body stiffens. This stiffness causes the muscles to contract and restricts respiration. They may also lose control of their bladder and bite their tongue.People who have this condition are at an increased risk of cardiovascular and psychiatric disorders, and may have impaired memory and cognitive skills. Treatment options vary according to the cause and severity of the seizure. Usually, patients do not require antiseizure medication.Although generalized tonic clonic seizures usually occur in adults, they can also happen in children. A tonic clonic seizure can be diagnosed by an EEG. Other tests may be performed to determine the cause of the seizure.Most patients with a tonic clonic seizure have no premonitory symptoms. In some cases, the patient will experience a vague warning. Symptoms include headache, dizziness, hallucinations, loss of bladder control and other neurological signs.When a person experiences a tonic clonic seizure, they will be confused. They may also feel dizzy, have a fever, vomit, feel sleepy and lose awareness of their surroundings.If a tonic clonic seizure is uncontrollable, a healthcare provider will attempt to reduce the frequency and severity of the seizure. In some cases, the patient will be admitted to the hospital for treatment.