<unk>  is chemically similar to other local anesthetics such as tetracaine and procaine, and shares their pharmacology and toxicology.<unk>  overdose is characterized by symptoms of restlessness, tremors, seizures, abnormal heart rhythms (cardiac arrhythmia), cerebral edema, absent breathing (apnea), fast heart beat (tachycardia), and in severe cases, coma and death. Symptoms develop rapidly, typically within 1 hour of ingestion. Treatment focuses on removal of gastric contents and on managing symptoms of sedation, convulsions, apnea, and cardiac arrhythmia. Despite a long history of safe and appropriate usage, the safety margin of<unk>  is reportedly narrow. Toxicity above the therapeutic dose is relatively low and ingestion of a small handful of pills can cause symptoms of overdose. Children are at an increased risk for toxicity, which have occurred with administration of only one or two capsules. Due to increasing usage of<unk>  and rapid onset of symptoms, there are accumulating cases of<unk>  overdose deaths, especially in children.
Benzonatate
Galantamine
Retigabine
Phenylpiracetam
Tianeptine
Ethosuximide
Chlordiazepoxide
Levetiracetam