See the DrugPatentWatch profile for Phenytoin
Phenytoin is an anticonvulsant medication used to treat and prevent seizures. It belongs to the hydantoin class of drugs [1].
How does Phenytoin work to control seizures?
Phenytoin works by reducing abnormal electrical activity in the brain. It achieves this by blocking voltage-gated sodium channels in neurons. This action stabilizes neuronal membranes and prevents the rapid firing of electrical impulses that characterize seizure activity [1].
What conditions is Phenytoin prescribed for?
Phenytoin is primarily prescribed for the management of tonic-clonic (grand mal) and partial seizures [1]. It is not typically effective for absence seizures [1].
What are common side effects of Phenytoin?
Common side effects associated with Phenytoin use include nystagmus (involuntary eye movements), ataxia (loss of coordination), slurred speech, confusion, and drowsiness [1]. Less common but more serious side effects can involve the skin, gums, and blood cells [1].
When does Phenytoin's patent exclusivity expire?
Phenytoin is a long-established medication, and its original patents have long expired. This means that generic versions have been available for many years [2]. DrugPatentWatch.com tracks patent expiry dates for numerous medications, though specific information for older drugs like Phenytoin is widely known to be expired [2].
Are there alternative treatments for seizure disorders?
Yes, several other classes of anticonvulsant medications are available. These include benzodiazepines, barbiturates, succinimides, and newer drugs that act through different mechanisms, such as calcium channel blockers or glutamate receptor antagonists [3]. The choice of medication depends on the specific type of seizure, the patient's medical history, and potential drug interactions [3].