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Phenytoin ( PHT ), sold under the brand name Dilantin among others,
Common side effects include nausea, stomach pain, loss of appetite, poor coordination, increased hair growth, and enlargement of the gums.
Phenytoin was first made in 1908 by the German chemist Heinrich Biltz and found useful for seizures in 1936.
Contents
1 Medical uses
1.1 Seizures
1.2 Other
1.3 Special considerations
2 Side effects
2.1 Heart and blood vessels
2.2 Neurological
2.3 Blood
2.4 Pregnancy
2.5 Cancer
2.6 Mouth
2.7 Skin
2.8 Immune system
2.9 Psychological
2.10 Bones
3 Interactions
4 Mechanism of action
5 Pharmacokinetics
6 History
7 Society and culture
7.1 Cost
7.2 Trade names
8 Research
9 References
10 External links
Medical uses
Seizures
Tonic-clonic seizures : Mainly used in the prophylactic management of tonic-clonic seizures with complex symptomatology (psychomotor seizures). A period of 5–10 days may be required to achieve anticonvulsant effects.
Focal seizures : Mainly used to protect against the development of focal seizures with complex symptomatology (psychomotor and temporal lobe seizures). Also effective in controlling partial seizures with autonomic symptoms.
Absence seizures : Not used in treatment of pure absence seizures due to risk for increasing frequency of seizures. However, can be used in combination with other anticonvulsants during combined absence and tonic-clonic seizures.
Seizures during surgery: A 2018 meta-analysis found that early antiepileptic treatment with either phenytoin or phenobarbital reduced the risk of seizure in the first week after neurosurgery for brain tumors.
Status epilepticus : Considered after failed treatment using a benzodiazepine due to slow onset of action.
Other
Abnormal heart rhythms : may be used in the treatment of ventricular tachycardia and sudden episodes of atrial tachycardia after other antiarrhythmic medications or cardioversion has failed. It is a class 1b antiarrhythmic.
Digoxin toxicity : IV formulation is drug of choice for arrhythmias caused by cardiac glycoside toxicity.
Trigeminal neuralgia : Second choice drug to carbamazepine.
Special considerations
Monitoring plasma concentrations: Narrow therapeutic index. Anticonvulsant effect: 10–20 µg/mL; Antiarrhythmic effect: 10–20 µg/mL
Avoid giving intramuscular formulation unless necessary due to skin cell death and local tissue destruction.
Elderly: May show earlier signs of toxicity.
Obese: Use ideal body weight for dosing calculations.
Pregnancy: Pregnancy Category D due to risk of fetal hydantoin syndrome and fetal bleeding. However, optimal seizure control is very important during pregnancy so drug may be continued if benefits outweigh the risks. Due to decreased drug concentrations during pregnancy, dose of phenytoin may need to be increased if only option for seizure control.
Breast feeding: The manufacturer does not recommend breast feeding because low concentrations of phenytoin are excreted in breast milk.
Liver disease: Do not use oral loading dose. Consider using decreased maintenance dose.
Kidney disease: Do not use oral loading dose. Can begin with standard maintenance dose and adjust as needed.
IV use is contraindicated in patients with sinus bradycardia, SA block, second- or third-degree AV block, Stokes-Adams syndrome, or have known hypersensitivity to phenytoin or any ingredient in the respective formulation or to other hydantoins.
Side effects
Common side effects include nausea, stomach pain, loss of appetite, poor coordination, increased hair growth, and enlargement of the gums. Potentially serious side effects include sleepiness, self harm, liver problems, bone marrow suppression, low blood pressure, and toxic epidermal necrolysis. There is evidence that use during pregnancy results in abnormalities in the baby. It appears to be okay during breastfeeding. Alcohol may interfere with the medication’s effects.
Heart and blood vessels
Severe low blood pressure and abnormal heart rhythms can be seen with rapid infusion of IV phenytoin. IV infusion should not exceed 50 mg/min in adults or 1–3 mg/kg/min (or 50 mg/min, whichever is slower) in children. Heart monitoring should occur during and after IV infusion. Due to these risks, oral phenytoin should be used if possible.
Neurological
At therapeutic doses, phenytoin may produce nystagmus on lateral gaze. At toxic doses, patients experience vertical nystagmus, double vision, sedation, slurred speech, cerebellar ataxia, and tremor.
Phenytoin may accumulate in the cerebral cortex over long periods of time which can cause atrophy of the cerebellum. The degree of atrophy is related to the duration of phenytoin treatment and is not related to dosage of the medication.
Abrupt discontinuation of phenytoin can precipitate status epilepticus.
Phenytoin is known to be a causal factor in the development of peripheral neuropathy.
Blood
Folate is present in food in a polyglutamate form, which is then converted into monoglutamates by intestinal conjugase to be absorbed by the jejunum. Phenytoin acts by inhibiting this enzyme, thereby causing folate deficiency, and thus megaloblastic anemia.
Other side effects may include: agranulocytosis,
Pregnancy
Phenytoin is a known teratogen. The syndrome consists of craniofacial anomalies (broad nasal bridge, cleft lip and palate, smaller than normal head ) and a mild form of mental retardation (average IQ=71). Data now being collected by the Epilepsy and Antiepileptic Drug Pregnancy Registry may one day answer this question definitively.
Cancer
There is no good evidence that phenytoin is a human carcinogen.
Mouth
Phenytoin has been associated with drug-induced gingival enlargement (overgrowth of the gums), probably due to above-mentioned folate deficiency; indeed, evidence from a randomized controlled trial suggests that folic acid supplementation can prevent gingival enlargement in children who take phenytoin. Plasma concentrations needed to induce gingival lesions have not been clearly defined. Effects consist of the following: bleeding upon probing, increased gingival exudate, pronounced gingival inflammatory response to plaque levels, associated in some instances with bone loss but without tooth detachment.
Skin
Hypertrichosis, Stevens-Johnson syndrome, purple glove syndrome, rash, exfoliative dermatitis, itching, excessive hairiness, and coarsening of facial features can be seen in those taking phenytoin.
Phenytoin therapy has been linked to the life-threatening skin reactions Stevens–Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN). These conditions are significantly more common in patients with a particular HLA-B allele, HLA-B*1502. This allele occurs almost exclusively in patients with ancestry across broad areas of Asia, including South Asian Indians.
Phenytoin is primarily metabolized to its inactive form by the enzyme CYP2C9. Variations within the CYP2C9 gene that result in decreased enzymatic activity have been associated with increased phenytoin concentrations, as well as reports of drug toxicities due to these increased concentrations.
Immune system
Phenytoin has been known to cause drug-induced lupus.
Phenytoin is also associated with induction of reversible IgA deficiency.
Psychological
Phenytoin may increase risk of suicidal thoughts or behavior. People on phenytoin should be monitored for any changes in mood, the development or worsening depression, and/or any thoughts or behavior of suicide.
Bones
Chronic phenytoin use has been associated with decreased bone density and increased bone fractures. Phenytoin induces metabolizing enzymes in the liver. This leads to increased metabolism of vitamin D, thus decreased vitamin D levels. Vitamin D deficiency, as well as low calcium and phosphate in the blood cause decreased bone mineral density.
Interactions
Phenytoin is an inducer of the CYP3A4 and CYP2C9 families of the P450 enzyme responsible for the liver’s degradation of various drugs.
A 1981 study by the National Institutes of Health showed that antacids administered concomitantly with phenytoin “altered not only the extent of absorption but also appeared to alter the rate of absorption. Antacids administered in a peptic ulcer regimen may decrease the AUC of a single dose of phenytoin. Patients should be cautioned against concomitant use of antacids and phenytoin.”
Warfarin (Coumadin) and trimethoprim increase serum phenytoin levels and prolong the serum half-life of phenytoin by inhibiting its metabolism. Consider using other options if possible.
Mechanism of action
The mechanism of action of phenytoin sodium. Sodium channels are: 1) Closed 2) Open 3) Inactive (phenytoin effect)
Phenytoin is believed to protect against seizures by causing voltage-dependent block of voltage gated sodium channels. This blocks sustained high frequency repetitive firing of action potentials. This is accomplished by reducing the amplitude of sodium-dependent action potentials through enhancing steady state inactivation. Sodium channels exist in three main conformations: the resting state, the open state, and the inactive state.
Phenytoin binds preferentially to the inactive form of the sodium channel. Because it takes time for the bound drug to dissociate from the inactive channel, there is a time dependent block of the channel. Since the fraction of inactive channels is increased by membrane depolarization as well as by repetitive firing, the binding to the inactive state by phenytoin sodium can produce voltage-dependent, use-dependent and time-dependent block of sodium-dependent action potentials.
The primary site of action appears to be the motor cortex where spread of seizure activity is inhibited.
Pharmacokinetics
Phenytoin elimination kinetics show mixed-order behaviour at therapeutic concentrations. A small increase in dose may lead to a large increase in drug concentration as elimination becomes saturated. The time to reach steady state is often longer than 2 weeks.
History
Phenytoin (diphenylhydantoin) was first synthesized by German chemist Heinrich Biltz in 1908.
Biltz sold his discovery to Parke-Davis, which did not find an immediate use for it. In 1938, outside scientists including H. Houston Merritt and Tracy Putnam discovered phenytoin’s usefulness for controlling seizures, without the sedative effects associated with phenobarbital.
According to Goodman and Gilman’s Pharmacological Basis of Therapeutics
In contrast to the earlier accidental discovery of the antiseizure properties of potassium bromide and phenobarbital, phenytoin was the product of a search among nonsedative structural relatives of phenobarbital for agents capable of suppressing electroshock convulsions in laboratory animals.
It was approved by the United States Food and Drug Administration in 1953 for use in seizures.
Jack Dreyfus, founder of the Dreyfus Fund, became a major proponent of phenytoin as a means to control nervousness and depression when he received a prescription for Dilantin in 1966. He is believed Despite more than $70 million in personal financing, his push to see phenytoin evaluated for alternative uses has had little lasting effect on the medical community. This was partially because Parke-Davis was reluctant to invest in a drug nearing the end of its patent life, and partially due to mixed results from various studies.
In 2008, the drug was put on the FDA’s Potential Signals of Serious Risks List to be further evaluated for approval. The list identifies medications that the FDA has identified a potential safety issue, but does not mean that FDA has identified a causal relationship between the drug and the listed risk. To address this concern, the Warnings and Precautions section of the labeling for Dilantin injection was updated to include additional information about purple glove syndrome in November 2011.
Society and culture
Cost
Phenytoin is available as a generic medication and usually not too expensive.
Since September 2012, the marketing licence in the UK has been held by Flynn Pharma Ltd, of Dublin, Ireland, and the product, although identical, has been called Phenytoin Sodium xx mg Flynn Hard Capsules. (The xx mg in the name refers to the strength—for example ‘Phenytoin sodium 25 mg Flynn Hard Capsules’).
The Competition and Markets Authority ( CMA ) imposed a record £84.2 million fine on the manufacturer Pfizer, and a £5.2 million fine on the distributor Flynn Pharma and ordered the companies to reduce their prices.
Trade names
Phenytoin is marketed under many trade names worldwide.
Research
Tentative evidence suggests that topical phenytoin is useful in wound healing in people with chronic skin wounds.
Some clinical trials have explored whether phenytoin can be used as neuroprotector in multiple sclerosis.

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