Other major lipid classes in the fatty acid category are the fatty esters and fatty amides. Fatty esters include important biochemical intermediates such as wax esters, fatty acid thioester coenzyme A derivatives, fatty acid thioester ACP derivatives and fatty acid carnitines.
Phenytoin is an antiepileptic drug which can be used in the treatment of epilepsy. The primary site of action appears to be the motor cortex where spread of seizure activity is inhibited.
Phenytoin was first made in 1908 and found useful in seizures in 1936. It is on the World Health Organization's List of Essential Medicines, most important medication needed in a basic health system. Phenytoin is available as a generic medication and usually not too expensive. Wholesale it costs between 0.003 and 0.15 USD per dose. A month of treatment is about 30 USD in the United States.