PRO-EPANUTIN Concentrate for solution for infusion Ref.[9267] Active ingredients:

Phenytoin sodium equivalents (PE)

Pro-Epanutin is a prodrug intended for parenteral administration; its active metabolite is phenytoin. 1.5 mg of fosphenytoin sodium is equivalent to 1 mg phenytoin sodium, and is referred to as 1 mg phenytoin sodium equivalents (PE). The amount and concentration of fosphenytoin is always expressed in terms of mg PE.

Intravenous (IV) Infusion rate

Adults

Pro-Epanutin should be administered IV at a rate no greater than 150 mg PE/min due to the risk of cardiovascular toxicity (see section 4.2).

Children (5 years and older)

Pro-Epanutin should be administered at a rate no greater than 3 mg PE/kg/min or 150 mg PE/min, whichever is slower, due to the risk of cardiovascular toxicity (see section 4.2).

Note that Pro-Epanutin has important differences in administration from parenteral phenytoin sodium.

Dosing Errors

Dosing errors associated with Pro-Epanutin have resulted in patients receiving the wrong dose of Pro-Epanutin. Pro-Epanutin is marketed in 2 mL and 10 mL vials at a concentration of 50 mg PE/mL. A 2 mL vial contains a total of 100 mg PE and a 10 mL vial contains a total of 500 mg PE. Errors have occurred when the concentration of the vial (50 mg PE/mL) was misinterpreted to mean that the total content of the vial was 50 mg PE, resulting in two- or ten-fold overdoses of Pro-Epanutin.

There have been other causes of dosing errors, including product name confusion, product preparation errors, drug infusion/administration errors and incorrect dose calculations. In some cases, overdoses were associated with fatal outcomes, including in children under 5 years of age.

To help minimize confusion, the prescribed dose of Pro-Epanutin should always be expressed in milligrams of phenytoin equivalents (mg PE) (see section 4.2). Care should be taken to ensure the appropriate volume of Pro-Epanutin is withdrawn from the vial when preparing the drug for administration. Attention to these details may prevent some Pro-Epanutin medication errors from occurring.

Monitoring of Patients

Continuous monitoring of electrocardiogram, blood pressure and respiratory function for the duration of the infusion is essential. The patient should also be observed throughout the period where maximal plasma phenytoin concentrations occur. This is approximately 30 minutes after the end of the Pro-Epanutin infusions. Cardiac resuscitative equipment should be available.

Cardiovascular Effect

Pro-Epanutin should be used with caution in patients with hypotension and severe myocardial insufficiency. Severe cardiovascular reactions including atrial and ventricular conduction depression, ventricular fibrillation, asystole and fatalities have been reported following phenytoin and fosphenytoin administration. Hypotension may also occur following IV administration of high doses and/or high infusion rates of Pro-Epanutin and even within recommended doses and rates. A reduction in the rate of administration or discontinuation of dosing may be necessary (see section 4.2).

Severe cardiac complications have been reported in elderly, children (especially infants), or gravely ill patients following administration of fosphenytoin. Cardiac adverse events have also been reported in adults and children without underlying cardiac disease or comorbidities and at recommended doses and infusion rates. Therefore, careful cardiac (including respiratory) monitoring is needed when administering IV loading doses of fosphenytoin.

Patients with an acute cerebrovascular event may be at increased risk of hypotension and require particularly close monitoring.

Absence Seizures

Phenytoin is not effective in absence seizures. If tonic-clonic seizures are present simultaneously with absence seizures, combined drug therapy is recommended.

Withdrawal Precipitated Seizure/Status Epilepticus

Abrupt withdrawal of antiepileptic drugs may increase seizure frequency and may lead to status epilepticus.

Suicidal Ideation and Behaviour

Suicidal ideation and behaviour have been reported in patients treated with anti-epileptic agents in several indications. A meta-analysis of randomised, placebo controlled trials of anti-epileptic drugs has also shown a small increased risk of suicidal ideation and behaviour. The mechanism of this risk is not known and the available data do not exclude the possibility of an increased risk for fosphenytoin.

Therefore patients should be monitored for signs of suicidal ideation and behaviours and appropriate treatment should be considered. Patients (and caregivers of patients) should be advised to seek medical advice should signs of suicidal ideation or behaviour emerge.

Local Toxicity (including Purple Glove Syndrome)

Edema, discoloration, and pain distal to the site of injection (described as “purple glove syndrome”) have also been reported following peripheral IV fosphenytoin injection. This may or may not be associated with extravasation. The syndrome may not develop for several days after injection. Although resolution of symptoms may occur without treatment, skin necrosis and limb ischemia have occurred that required surgical interventions and, in rare cases, amputation.

Hypersensitivity Syndrome/Drug Reaction with Eosinophilia and Systemic Symptoms (HSS/DRESS)

Hypersensitivity Syndrome (HSS) or Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS) has been reported in patients taking anticonvulsant drugs, including phenytoin and fosphenytoin. Some of these events have been fatal or life threatening.

HSS/DRESS typically, although not exclusively, presents with fever, rash, and/or lymphadenopathy, in association with other organ system involvement, such as hepatitis, nephritis, hematological abnormalities, myocarditis, myositis or pneumonitis. Initial symptoms may resemble an acute viral infection. Other common manifestations include arthralgias, jaundice, hepatomegaly, leukocytosis, and eosinophilia. The interval between first drug exposure and symptoms is usually 2-4 weeks of treatment but has also been reported in individuals receiving anticonvulsants for 3 or more months. If such signs and symptoms occur, the patient should be evaluated immediately. Fosphenytoin should be discontinued if an alternative etiology for the signs and symptoms cannot be established.

Patients at higher risk for developing HSS/DRESS include black patients, patients who have experienced this syndrome in the past (with phenytoin, fosphenytoin or other anticonvulsant drugs), patients who have a family history of this syndrome and immuno-suppressed patients. The syndrome is more severe in previously sensitized individuals.

Serious Cutaneous Adverse Reactions

Fosphenytoin can cause severe cutaneous adverse reactions (SCARs) such as acute generalized exanthematous pustulosis (AGEP), exfoliative dermatitis, Stevens-Johnson Syndrome (SJS), toxic epidermal necrolysis (TEN), and DRESS, which can be fatal. Although serious skin reactions may occur without warning, patients should be alert for the occurrence of rash and other symptoms of HSS/DRESS and should seek medical advice from their physician immediately when observing any indicative signs or symptoms. The physician should advise the patient to discontinue treatment if the rash appears. If the rash is of a milder type (measles-like or scarlatiniform), therapy may be resumed after the rash has completely disappeared. If the rash recurs upon reinstitution of therapy, further fosphenytoin or phenytoin administration is contraindicated.

The risk of serious skin reactions and other hypersensitivity reactions to phenytoin may be higher in black patients.

Studies in patients of Chinese ancestry have found a strong association between the risk of developing SJS/TEN and the presence of HLA-B*1502, an inherited allelic variant of the HLA B gene, in patients using carbamazepine. Limited evidence suggests that HLA-B*1502 may be a risk factor for the development of SJS/TEN in patients of Asian ancestry taking drugs associated with SJS/TEN, including phenytoin.

Literature reports suggest that the combination of phenytoin, cranial irradiation and the gradual reduction of corticosteroids may be associated with the development of erythema multiforme, and/or Stevens-Johnson syndrome, and/or toxic epidermal necrolysis.

Drug rash with eosinophilia and systemic symptoms (DRESS) reflects a serious hypersensitivity reaction to drugs, characterized by skin rash, fever, lymph node enlargement, and internal organ involvement. Cases of DRESS have been noted in patients taking phenytoin.

CYP2C9 metabolism

Phenytoin is metabolised by the CYP450 CYP2C9 enzyme. Patients who are carriers of the decreased function CYP2C9*2 or CYP2C9*3 variants (intermediate or poor metabolisers of CYP2C9 substrates) may be at risk of increased phenytoin plasma concentrations and subsequent toxicity. In patients who are known to be carriers of the decreased function CYP2C9*2 or *3 alleles, close monitoring of clinical response is advised, and monitoring of plasma phenytoin concentrations may be required.

Angioedema

Angioedema has been reported in patients treated with phenytoin and fosphenytoin. Fosphenytoin should be discontinued immediately if symptoms of angioedema, such as facial, perioral, or upper airway swelling occur.

Hepatic Injury

The liver is the chief site of biotransformation of phenytoin.

Toxic hepatitis and liver damage have been reported with phenytoin and may, in rare cases, be fatal.

Cases of acute hepatotoxicity, including infrequent cases of acute hepatic failure, have been reported with phenytoin. These incidents usually occur within the first 2 months of treatment and may be associated with HSS/DRESS. Patients with impaired liver function, elderly patients, or those who are gravely ill may show early signs of toxicity.

The clinical course of acute phenytoin hepatotoxicity ranges from prompt recovery to fatal outcomes. In patients with acute hepatotoxicity, fosphenytoin should be immediately discontinued and not re-administered.

The risk of hepatotoxicity and other hypersensitivity reactions to phenytoin may be higher in black patients.

Haematopoietic System

Haematopoietic complications, some fatal, have occasionally been reported in association with administration of phenytoin. These have included thrombocytopenia, leukopenia, granulocytopenia, agranulocytosis, and pancytopenia with or without bone marrow suppression (see section 4.8).

Lymphadenopathy (local or generalised) including benign lymph node hyperplasia, pseudolymphoma, lymphoma and Hodgkin’s Disease have been associated with administration of phenytoin, although a cause and effect relationship has not been established. It is therefore, important to eliminate other types of lymph node pathology before discontinuing therapy with Pro-Epanutin. Lymph node involvement may occur with or without symptoms and signs resembling HSS/DRESS described above. In all cases of lymphadenopathy, long term follow-up observations are indicated and every effort should be made to achieve seizure control using alternative antiepileptic drugs.

Acute Toxicity

Confusional states referred to as “delirium”, “psychosis” or “encephalopathy” or rarely irreversible cerebellar dysfunction and/or cerebellar atrophy may occur if plasma phenytoin concentrations are sustained above the optimal therapeutic range and/or long-term phenytoin use. Plasma phenytoin concentrations should be determined at the first sign of acute toxicity (see section 4.2). If plasma phenytoin concentrations are excessive, the dose of Pro-Epanutin should be reduced. If symptoms persist, administration of Pro-Epanutin should be discontinued.

Renal or Hepatic Disease

Pro-Epanutin should be used with caution in patients with renal and/or hepatic disease, or in those with hypoalbuminaemia.

Due to an increased fraction of unbound phenytoin in patients with renal or hepatic disease, or in those with hypoalbuminaemia, the interpretation of total phenytoin plasma concentrations should be made with caution as it may not reflect the pharmacologically active unbound concentration. Unbound concentration of phenytoin may be elevated in patients with hyperbilirubinaemia. Unbound phenytoin concentrations are more appropriate in these patients (see sections 4.2 and 5.2). Alterations in dosing may be necessary in patients with impaired kidney or liver function, elderly patients or those who are gravely ill (see section 4.2). These patients may show early signs of phenytoin toxicity or an increase in the severity of adverse events due to alterations in Pro-Epanutin and phenytoin pharmacokinetics.

The phosphate load provided by Pro-Epanutin is 0.0037 mmol phosphate/mg fosphenytoin sodium. Caution is advised when administering Pro-Epanutin in patients requiring phosphate restriction, such as those with severe renal impairment.

Sensory Disturbances

Overall these occur in 13% of the patients exposed to Pro-Epanutin. Transient itching, burning, warmth or tingling in the groin during and shortly after IV infusion of Pro-Epanutin may occur. The sensations are not consistent with the signs of an allergic reaction and may be avoided or minimised by using a slower rate of IV infusion or by temporarily stopping the infusion.

Diabetes

Phenytoin may raise blood glucose in diabetic patients.

Alcohol Use

Acute alcohol intake may increase plasma phenytoin concentrations while chronic alcohol use may decrease plasma phenytoin concentrations.

Women of Childbearing Potential

Pro-Epanutin may cause foetal harm when administered to a pregnant woman. Prenatal exposure to phenytoin may increase the risks for congenital malformations and other adverse development outcomes (see section 4.6).

Sodium Content

When calculating the total amount of sodium, any dilution of fosphenytoin sodium injection with sodium chloride solution should be taken into consideration (see section 6.6).

Fosphenytoin sodium injection 75 mg/mL contains 8.5 mg sodium per mL.

Pro-Epanutin is available in 10 mL and 2 mL vials.

Each 10 mL vial contains 85 mg sodium equivalent to 4.25% of the WHO recommended maximum daily intake of 2 g sodium for an adult.

Each 2 mL vial contains 17 mg sodium equivalent to 0.85% of the WHO recommended maximum daily intake of 2 g sodium for an adult.

Drug interactions which may occur following the administration of Pro-Epanutin are those that are expected to occur with drugs known to interact with phenytoin. Phenytoin metabolism is saturable and other drugs that utilise the same metabolic pathways may alter plasma phenytoin concentrations. There are many drugs which may increase or decrease plasma phenytoin concentrations. Equally phenytoin may affect the metabolism of a number of other drugs because of its potent enzyme-inducing potential. Determination of plasma phenytoin concentrations is especially helpful when possible drug interactions are suspected (see section 4.2).

No drugs are known to interfere with the conversion of fosphenytoin to phenytoin.

Phenytoin is extensively bound to plasma proteins and is prone to competitive displacement. Drugs highly bound to albumin could also increase the fosphenytoin unbound fraction with the potential to increase the rate of conversion of fosphenytoin to phenytoin.

Phenytoin is mainly metabolized in the liver by the cytochrome P450 CYP2C9 and CYP2C19 enzymes.

Inhibition of phenytoin metabolism may produce significant increases in plasma phenytoin concentrations and increase the risk of phenytoin toxicity. Phenytoin is also a potent inducer of hepatic drug-metabolising enzymes and may reduce the levels of drugs metabolized by these enzymes.

The following drug interactions are the most commonly occurring drug interactions with phenytoin:

Drugs that may increase serum phenytoin concentrations listed by likely mechanism:

^a The list is not intended to be inclusive or comprehensive. Individual drug labels should be consulted.

Drugs that may decrease plasma phenytoin concentrations listed by likely mechanism:

^a This list is not intended to be inclusive or comprehensive. Individual drug labels should be consulted.
^b Co-administration of nelfinavir tablets (1,250 mg twice a day) with phenytoin capsules (300 mg once a day) did not change the plasma concentration of nelfinavir. However, co-administration of nelfinavir reduced the AUC values of phenytoin (total) and free phenytoin by 29% and 28%, respectively. Plasma concentrations of phenytoin should be monitored during concomitant treatment with nelfinavir.

Drugs that may increase or decrease phenytoin concentrations listed by likely mechanism:

^a This list is not intended to be inclusive or comprehensive. Individual drug labels should be consulted.

Drugs whose serum levels and/or effects may be altered by phenytoin listed by likely mechanism:

^a This list is not intended to be inclusive or comprehensive. Individual drug labels should be consulted.

Although not a true pharmacokinetic interaction, tricyclic antidepressants and phenothiazines may precipitate seizures in susceptible patients and Pro-Epanutin dosage may need to be adjusted.

Pharmacodynamic interactions

Concomitant use of paroxetine or sertraline with phenytoin may lower the seizure threshold.

Phenytoin may increase serum glucose levels and therefore adjustment for insulin or oral antidiabetic agents (glibenclamide, tolbutamide) may be necessary.

Drug/Laboratory Test Interactions

Phenytoin may decrease serum concentrations of T4. It may also produce low results in dexamethasone or metyrapone tests. This may be an artefact. Phenytoin may cause increased blood glucose or serum concentrations of alkaline phosphatase and gamma glutamyl transpeptidase (GGT). Phenytoin may affect blood calcium and blood sugar metabolism tests.

Phenytoin has the potential to lower serum folate levels.

Pregnancy

Risk related to antiepileptic medicinal products in general

When possible, medical advice regarding the potential risks to a foetus caused by both seizures and antiepileptic treatment should be given to all women of childbearing potential taking antiepileptic treatment, and especially to women planning pregnancy and women who are pregnant. Antiepileptic treatment should be reviewed regularly and especially when a woman is planning to become pregnant. In pregnant women being treated for epilepsy, sudden discontinuation of antiepileptic drug (AED) therapy should be avoided as this may lead to breakthrough seizures that could have serious consequences for the woman and the unborn child. As a general principle, monotherapy is preferred for treating epilepsy in pregnancy whenever possible because therapy with multiple AEDs could be associated with a higher risk of congenital malformations than monotherapy, depending on the associated AEDs.

Risk related to phenytoin

Phenytoin crosses the placenta in humans. Similar concentrations of phenytoin have been reported in the umbilical cord and maternal blood.

Prenatal exposure to phenytoin may increase the risks for congenital malformations and other adverse developmental outcomes. In humans, phenytoin exposure during pregnancy is associated with a frequency of major malformations 2 to 3 times higher than that of the general population, which has a frequency of 2-3%. Malformations such as orofacial clefts, cardiac defects, dysmorphic facial features, nail and digit hypoplasia, and growth abnormalities (including microcephaly) have been reported among children born to women with epilepsy who took phenytoin during pregnancy. Fetal toxicity, developmental toxicity and teratogenicity were observed in offspring of rats given fosphenytoin during pregnancy, similar to those reported with phenytoin (see section 5.3). Neurodevelopmental disorder has been reported among children born to women with epilepsy who took phenytoin alone or in combination with other AEDs during pregnancy. Studies related to neurodevelopmental risk in children exposed to phenytoin during pregnancy are contradictory and a risk cannot be excluded. There have been several reported cases of malignancies, including neuroblastoma, in children whose mothers received phenytoin during pregnancy. However, the respective role of antiepileptic drugs and other factors in the increased risk is not determined.

Pro-Epanutin should not be used in women of childbearing potential, women planning pregnancy, and pregnant women, except where there is a clinical need and when possible, the woman is made aware of the risks of taking fosphenytoin during pregnancy.

An increase in seizure frequency may occur during pregnancy because of altered phenytoin pharmacokinetics. Periodic measurement of plasma phenytoin concentrations may be valuable in the management of pregnant women as a guide to appropriate adjustment of dosage (see section 4.2). However, postpartum restoration of the original dosage will probably be indicated.

In women of childbearing potential

Pro-Epanutin should not be used in women of childbearing potential unless other antiepileptic drugs are ineffective or not tolerated and when possible, the woman is made aware of the risk of potential harm to the foetus and the importance of planning pregnancy.

Women of childbearing potential should use effective contraception during treatment. Pregnancy testing in women of childbearing potential should be considered prior to initiating treatment with Pro-Epanutin.

Pro-Epanutin may result in a failure of hormonal contraceptives, hence women of childbearing potential should be counselled regarding the use of other effective contraceptive methods (see section 4.5).

Women planning to become pregnant and in pregnant women

In women planning to become pregnant all efforts should be made to switch to appropriate alternative treatment prior to conception, if possible. Pro-Epanutin should not be discontinued prior to reassessment of the treatment. When possible, patients should be informed of the potential harm to the foetus. If based on a careful evaluation of the risks and the benefits, Pro-Epanutin treatment is continued during the pregnancy, it is recommended to use the lowest effective dose and to institute specialized prenatal monitoring, oriented on the possible occurrence of the described malformations.

In neonates

Haemorrhagic syndrome has been reported in neonates born from epileptic mothers receiving phenytoin. Vitamin K has been shown to prevent or correct this defect and has been recommended to be given to the mother during the last gestational month and to the neonate after birth.

Post-natal monitoring/children

In case of exposure during pregnancy, children should be closely monitored in relation to neurodevelopmental disorders in order to provide specialized care as soon as possible, if necessary.

Breast-feeding

It is not known whether Pro-Epanutin is excreted in human milk. Following administration of oral phenytoin, phenytoin appears to be excreted in low concentrations in human milk. Therefore, breast-feeding is not recommended for women receiving Pro-Epanutin.

Fertility

In animal studies, fosphenytoin had no effect on fertility in male rats but decreased fertility in female rats (see section 5.3).

Caution is recommended in patients performing skilled tasks (e.g. driving or operating machinery) as treatment with fosphenytoin may cause central nervous system adverse effects such as dizziness and drowsiness (see section 4.8).

The following adverse events have been reported in clinical trials in adults receiving Pro-Epanutin. The list also includes adverse effects that have been reported spontaneously following both the acute and chronic use of phenytoin.

The more important adverse clinical events caused by the IV use of fosphenytoin or phenytoin are cardiovascular collapse and/or central nervous system depression. Hypotension can occur when either drug is administered rapidly by the IV route.

The adverse clinical events most commonly observed with the use of fosphenytoin in clinical trials were nystagmus, dizziness, pruritus, paraesthesia, headache, somnolence, and ataxia. With two exceptions, these events are commonly associated with the administration of IV phenytoin. Paraesthesia and pruritus, however, were seen much more often following fosphenytoin administration and occurred more often with IV fosphenytoin administration than IM fosphenytoin administration. These events were dose and rate related.

In the table below all adverse reactions, which occurred at an incidence greater than placebo and in more than one patient, are listed by class and frequency (very common (≥1/10), common (≥1/100, <1/10) uncommon (≥1/1,000, <1/100)) and Not known (cannot be estimated from available data). Within each frequency grouping, undesirable effects are presented in order of decreasing seriousness.

Additional reactions reported from post-marketing experience are included as frequency ‘Not known’.

Blood and the lymphatic system disorders

Not known: leukopenia, granulocytopenia, agranulocytosis, pancytopenia with or without bone marrow suppression, thrombocytopenia, aplastic anaemia, lymphadenopathy. Some of these reports have been fatal.

Immune system disorders

Not known: anaphylactic/anaphylactoid reaction, hypersensitivity syndrome, periarteritis nodosa, immunoglobulin abnormalities, angioedema (see section 4.4).

Metabolism and nutrition disorders

Not known: hyperglycaemia, appetite disorder

Psychiatric disorders

Common: euphoric mood

Uncommon: nervousness, confusional state, abnormal thinking

Nervous system disorders

Very common: nystagmus, dizziness

Common: paraesthesia, ataxia, somnolence, headache, tremor, abnormal coordination, dysgeusia, stupor, dysarthria

Uncommon: hypoesthesia, reflexes increased, hyporeflexia

Not known: extrapyramidal disorder, dyskinesia including chorea, dystonia and asterixis similar to those induced by phenothiazines or other neuroleptic drugs, drowsiness, motor twitching, insomnia, tonic seizures. A predominantly sensory peripheral polyneuropathy has been observed in patients receiving long-term phenytoin therapy. The incidence and severity of adverse events related to the CNS and sensory disturbances were greater at higher doses and rates.

Eye disorders

Common: blurred vision, visual impairment

Uncommon: diplopia

Ear and labyrinth disorders

Common: tinnitus, vertigo

Uncommon: hypoacusis

Cardiac disorders

Uncommon: cardiac arrest

Not known: severe cardiotoxic reactions with atrial and ventricular conduction depression (including bradycardia and all degrees of heart block), ventricular fibrillation and cardiovascular collapse (see section 4.4).

Vascular disorders

Common: vasodilatation, hypotension

Respiratory, thoracic and mediastinal disorders

Not known: pneumonitis, alterations in respiratory function including respiratory arrest. Some of these reactions have been fatal (see section 4.2).

Gastrointestinal disorders

Common: nausea, dry mouth, vomiting

Uncommon: hypoaesthesia of the tongue

Not known: gingival hyperplasia, constipation

Hepatobiliary disorders

Not known: toxic hepatitis, hepatocellular damage

Skin and subcutaneous tissue disorders

Very Common: pruritus

Common: ecchymosis

Uncommon: rash. Other more serious and rare forms have included bullous, exfoliative or purpuric dermatitis, lupus erythematosus, Stevens-Johnson syndrome and toxic epidermal necrolysis (see section 4.4).

Not known: hirsutism, hypertrichosis, coarsening of the facial features, enlargement of the lips, Peyronie’s disease, Dupuytren’s contracture, acute generalized exanthematous pustulosis (AGEP), and drug reaction with eosinophilia and systemic symptoms (DRESS) (see section 4.4).

Musculoskeletal and connective tissue disorders

Uncommon: muscular weakness, muscle twitching, muscle spasms

Not known: systemic lupus erythematosus, polyarthritis, Purple Glove Syndrome (see section 4.4).

Renal and urinary disorders

Not known: interstitial nephritis

General disorders and administration site conditions

Common: injection-site reaction, injection-site pain, asthenia, chills

Not known: feeling of warmth or tingling in the groin

There have been reports of decreased bone mineral density, osteopenia, osteoporosis and fractures in patients on long-term therapy with phenytoin. The mechanism by which phenytoin affects bone metabolism has not been identified.

Paediatric Population

The overall incidence and the types of adverse reactions in controlled clinical trials with IV administration of fosphenytoin to paediatric patients with epilepsy or neurosurgical patients were similar among children and adults treated with fosphenytoin. In an open-label, safety, tolerability, and pharmacokinetic study of fosphenytoin in paediatric subjects (neonates through age 16), the following adverse reactions occurred at a frequency greater than 5% in 96 subjects treated with intravenous fosphenytoin: vomiting (20.8%), nystagmus (17.7%), ataxia (10.4%), fever (8.3%), nervousness (7.3%), pruritus (6.3%), somnolence (6.3%), rash (5.2%).

No trends in laboratory changes were observed in Pro-Epanutin treated patients.

Reporting of suspected adverse reactions

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.

This medicinal product must not be mixed with other medicinal products except those mentioned in section 6.6.