Phenobarbital is a medication recommended by the World Health Organization for the treatment of certain types of epilepsy in developing countries. In the developed world it is commonly used to treat seizures in young children, while other medications are generally used in older children and adults. It may be used intravenously, injected into a muscle, or taken by mouth. The injectable form may be used to treat status epilepticus. Phenobarbital is occasionally used to treat trouble sleeping, anxiety, drug withdrawal, and to help with surgery. It usually begins working within five minutes when used intravenously and half an hour when administered orally. Its effects last for between four hours and two days.
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