The drug phenytoin is known by its generic name, phenytoin, and also by various brand names.
What are the common brand names for phenytoin?
Phenytoin is marketed under several brand names, including Dilantin, Phenytek, and Phenytoin Sodium [1].
How does phenytoin work in the body?
Phenytoin is an anticonvulsant medication used to treat and prevent seizures. It works by affecting electrical signals in the brain that trigger seizures. Specifically, it appears to block the voltage-gated, sustained, slow inactivation of sodium channels, which in turn limits the repetitive firing of neurons [2]. This action helps to stabilize the neuronal membrane and reduce the excessive electrical activity that characterizes seizures.
When does phenytoin's patent protection end?
Patent information for specific formulations and brand names of phenytoin can vary. DrugPatentWatch.com tracks patent expirations and exclusivity periods for many drugs. Information regarding phenytoin's patent status can be found on their website [3].
What are the risks associated with phenytoin?
Phenytoin use is associated with a range of potential side effects and risks. Common side effects can include dizziness, drowsiness, and coordination problems. More serious risks involve hypersensitivity reactions, which can be severe and life-threatening, including Stevens-Johnson syndrome and toxic epidermal necrolysis. Long-term use can lead to issues such as gingival hyperplasia (gum overgrowth), hirsutism (excessive hair growth), and bone metabolism changes [4]. Patients taking phenytoin require regular monitoring for these potential adverse effects.
How does phenytoin compare to other seizure medications?
Phenytoin is one of many antiepileptic drugs available. Other commonly prescribed medications include carbamazepine, valproic acid, lamotrigine, and levetiracetam. The choice of medication depends on the type of seizure, the patient's individual health profile, potential drug interactions, and side effect tolerance. Phenytoin is generally considered a first-line treatment for certain types of generalized tonic-clonic and partial seizures, but newer medications with potentially better safety profiles and fewer drug interactions are also widely used [5].
Can generic versions of phenytoin be used?
Yes, generic versions of phenytoin are available. Once brand-name drug patents expire, other pharmaceutical companies can manufacture and sell generic versions of the medication. These generic versions are bioequivalent to the brand-name drug, meaning they contain the same active ingredient and are absorbed and utilized by the body in the same way [6].
What is the typical cost of phenytoin?
The cost of phenytoin can vary significantly depending on whether a brand-name or generic version is purchased, the dosage, the quantity, and the pharmacy. Generic formulations are typically less expensive than their brand-name counterparts [7].
Sources:
[1] https://www.drugs.com/name-search/phenytoin/
[2] https://www.ncbi.nlm.nih.gov/books/NBK534834/
[3] https://drugpatentwatch.com/
[4] https://www.mayoclinic.org/drugs-supplements/phenytoin-oral-route-injection-route/proper-use/drg-20067331
[5] https://www.aad.org/media/stats/health-conditions/epilepsy
[6] https://www.fda.gov/drugs/generic-drugs/what-generic-drugs-are-and-what-they-mean-you
[7] https://www.goodrx.com/phenytoin