Phenytex - General Information:

An anticonvulsant that is used in a wide variety of seizures. It is also an anti-arrhythmic and a muscle relaxant. The mechanism of therapeutic action is not clear, although several cellular actions have been described including effects on ion channels, active transport, and general membrane stabilization. The mechanism of its muscle relaxant effect appears to involve a reduction in the sensitivity of muscle spindles to stretch. Phenytex has been proposed for several other therapeutic uses, but its use has been limited by its many adverse effects and interactions with other drugs. [PubChem]


    Phenytex is an antiepileptic drug which can be useful in the treatment of epilepsy. The primary site of action appears to be the motor cortex where spread of seizure activity is inhibited. Phenytex reduces the maximal activity of brain stem centers responsible for the tonic phase of tonic-clonic (grand mal) seizures. Phenytex acts to damp the unwanted, runaway brain activity seen in seizure by reducing electrical conductance among brain cells. It lacks the sedation effects associated with phenobarbital. There are some indications that phenytoin has other effects, including anxiety control and mood stabilization, although it has never been approved for those purposes by the FDA.

    Phenytex for patients

    Patients taking phenytoin should be advised of the importance of adhering strictly to the prescribed dosage regimen, and of informing the physician of any clinical condition in which it is not possible to take the drug orally as prescribed, eg, surgery, etc.

    Patients should also be cautioned on the use of other drugs or alcoholic beverages without first seeking the physician's advice.

    Patients should be instructed to call their physician if skin rash develops.

    The importance of good dental hygiene should be stressed in order to minimize the development of gingival hyperplasia and its complications.

    Do not use capsules which are discolored.

    Phenytex Interactions

    There are many drugs which may increase or decrease phenytoin levels or which phenytoin may affect. Serum level determinations for phenytoin are especially helpful when possible drug interactions are suspected. The most commonly occurring drug interactions are listed below:

    1. Drugs which may increase phenytoin serum levels include: acute alcohol intake, amiodarone, chloramphenicol, chlordiazepoxide, diazepam, dicumarol, disulfiram, estrogens, H2-antagonists, halothane, isoniazid, methylphenidate, phenothiazines, phenylbutazone, salicylates, succinimides, sulfonamides, tolbutamide, trazodone.

    2. Drugs which may decrease phenytoin serum levels include: carbamazepine, chronic alcohol abuse, reserpine, and sucralfate. Moban brand of Molindone Hydrochloride contains calcium ions which interfere with the absorption of phenytoin. Ingestion times of phenytoin and antacid preparations containing calcium should be staggered in patients with low serum phenytoin levels to prevent absorption problems.

    3. Drugs which may either increase or decrease phenytoin serum levels include: phenobarbital, sodium valproate, and valproic acid. Similarly, the effect of phenytoin on phenobarbital, valproic acid and sodium valproate serum levels is unpredictable.

    4. Although not a true drug interaction, tricyclic antidepressants may precipitate seizures in susceptible patients and phenytoin dosage may need to be adjusted.

    5. Drugs whose efficacy is impaired by phenytoin include: corticosteroids, coumarin anticoagulants, digitoxin, doxycycline, estrogens, furosemide, oral contraceptives, quinidine, rifampin, theophylline, vitamin D.

    Drug/Laboratory Test Interactions

    Phenytoin may cause decreased serum levels of protein-bound iodine (PBI). It may also produce lower than normal values for dexamethasone or metyrapone tests. Phenytoin may cause increased serum levels of glucose, alkaline phosphatase, and gamma glutamyl transpeptidase (GGT).

    Phenytex Contraindications

    Phenytoin is contraindicated in those patients who are hypersensitive to phenytoin or other hydantoins.

    Other Brand Names containing Phenytoin:

    Aleviatin; Antisacer; Auranile; Causoin; Citrullamon; Citrulliamon; Comital; Comitoina; Convul; Danten; Dantinal; Dantoinal; Dantoinal klinos; Dantoine; Denyl; Di-Hydan; Di-Lan; Di-Phetine; Didan TDC 250; Difenilhidantoina; Difenin; Difetoin; Difhydan; Dihycon; Dilabid; Dilantin; Dilantin acid; Dilantin-125; Dilantine; Dillantin; Dintoin; Dintoina; Diphantoin; Diphedal; Diphedan; Diphenat; Diphenin; Diphenine; Diphentoin; Diphentyn; Diphenylan; Ditoinate; Ekko; Elepsindon; Enkelfel; Epamin; Epanutin; Epasmir 5; Epdantoin Simple; Epdantoine simple; Epelin; Epifenyl; Epihydan; Epilan; Epilan D; Epilan-D; Epilantin; Epinat; Epised; Eptal; Eptoin; Fenantoin; Fenidantoin s; Fentoin; Fenylepsin; Fenytoin Dak; Fenytoine; Gerot-epilan-D; Hidan; Hidantal; Hidantilo; Hidantina; Hidantina senosian; Hidantina vitoria; Hidantomin; Hindatal; Hydantal; Hydantin; Hydantoin; Hydantoinal; Hydantol; Ictalis simple; Idantoil; Idantoin; Iphenylhydantoin; Kessodanten; Labopal; Lehydan; Lepitoin; Lepsin; Mesantoin; Minetoin; Neos-Hidantoina; Neosidantoina; Novantoina; Novophenytoin; Om hidantoina simple; Om-Hydantoine; Oxylan; Phanantin; Phanatine; Phenatine; Phenatoine; Phenhydan; Phenhydanin; Phenitoin; Phentoin; Phentytoin; Phenytex; Phenytoin AWD; Phenytoin-Gerot; Prompt Phenytoin Sodium; Ritmenal; Saceril; Sanepil; Silantin; Sinergina; Sodanthon; Sodantoin; Sodanton; Solantin; Solantoin; Solantyl; Sylantoic; TOIN; Tacosal; Thilophenyl; Toin unicelles; Zentronal; Zentropil;

    Phenytex more info

    Indication, Mechanism Of Action, Drug Interactions, Food Interactions, etc..