Isox (Itraconazole)

Symptoms:

In general, adverse events reported with overdose have been consistent with adverse drug reactions already listed in this SmPC for Isox (Itraconazole).

Treatment:

In the event of an overdose, supportive measures should be employed. Activated charcoal may be given if considered appropriate. Isox (Itraconazole) cannot be removed by haemodialysis. No specific antidote is available.

Symptoms and signs

Treatment

In the event of overdosage, supportive measures should be employed. Activated charcoal may be given if considered appropriate. Itraconazole cannot be removed by haemodialysis. No specific antidote is available.

Pharmacotherapeutic group: Antimycotic for systemic use, triazole derivative.

ATC code: J02A C02

Mode of action

Isox (Itraconazole) inhibits fungal 14α-demethylase, resulting in a depletion of ergosterol and disruption of membrane synthesis by fungi.

PK/PD relationship

The PK/PD relationship for Isox (Itraconazole), and for triazoles in general, is poorly understood and is complicated by limited understanding of antifungal pharmacokinetics.

Mechanism(s) of resistance

Resistance of fungi to azoles appears to develop slowly and is often the result of several genetic mutations. Mechanisms that have been described are

- Over-expression of ERG11, the gene that encodes 14-alpha-demethylase (the target enzyme)

- Point mutations in ERG11 that lead to decreased affinity of 14-alpha-demethylase for Isox (Itraconazole)

- Drug-transporter over-expression resulting in increased efflux of Isox (Itraconazole) from fungal cells (i.e., removal of Isox (Itraconazole) from its target)

- Cross-resistance. Cross-resistance amongst members of the azole class of drugs has been observed within Candida species though resistance to one member of the class does not necessarily confer resistance to other azoles.

Breakpoints

Breakpoints for candida species are in preparation.

The prevalence of acquired resistance may vary geographically and with time for selected species, and local information on resistance is desirable, particularly when treating severe infections. As necessary, expert advice should be sought when the local prevalence of resistance is such that the utility of the agent in at least some types of infections is questionable.

The in vitro susceptibility of fungi to Isox (Itraconazole) depends on the inoculum size, incubation temperature, growth phase of the fungi, and the culture medium used. For these reasons, the minimum inhibitory concentration of Isox (Itraconazole) may vary widely. Susceptibility in the table below is based on MIC₉₀ < 1 mg Isox (Itraconazole)/L. There is no correlation between in vitro susceptibility and clinical efficacy.

¹ These organisms may be encountered in patients who have returned from travel outside Europe.

² Isox (Itraconazole)-resistant strains of Aspergillus fumigatus have been reported.

³ Natural intermediate susceptibility.

Paediatric Population

The tolerability and safety of Isox (Itraconazole) oral solution was studied in the prophylaxis of fungal infections in 103 neutropenic paediatric patients aged 0 to14 years (median 5 years) in an open-label uncontrolled phase III clinical study. Most patients (78%) were undergoing allogenic bone marrow transplantation for haematological malignancies. All patients received 5 mg/kg/day of Isox (Itraconazole) oral solution as a single or divided dose. Due to the design of the study, no formal conclusion with regard to efficacy could be derived. The most common adverse events considered definitely or possibly related to Isox (Itraconazole) were vomiting, abnormal liver function, and abdominal pain.

Pharmacotherapeutic classification: (Antimycotics for systemic use, triazole derivatives).

ATC code: J02A C02

Itraconazole, a triazole derivative, has a broad spectrum of activity.

In vitro studies have demonstrated that itraconazole impairs the synthesis of ergosterol in fungal cells. Ergosterol is a vital cell membrane component in fungi. Impairment of its synthesis ultimately results in an antifungal effect.

For itraconazole, breakpoints have only been established for Candida spp. from superficial mycotic infections (CLSI M27-A2, breakpoints have not been established for EUCAST methodology). The CLSI breakpoints are as follows: susceptible ≤0.125; susceptible, dose-dependent 0.25-0.5 and resistant > 1μg/mL. Interpretive breakpoints have not been established for the filamentous fungi.

In vitro studies demonstrate that itraconazole inhibits the growth of a broad range of fungi pathogenic for humans at concentrations usually ≤ 1 µg/ml. These include:

dermatophytes (Trichophyton spp., Microsporum spp., Epidermophyton floccosum); yeasts (Candida spp., including C. albicans, C. tropicalis, C. parapsilosis and C. krusei, Cryptococcus neoformans, Malassezia spp., Trichosporon spp., Geotrichum spp.); Aspergillus spp.; Histoplasma spp., including H. capsulatum; Paracoccidioides brasiliensis; Sporothrix schenckii; Fonsecaea spp.; Cladosporium spp.; Blastomyces dermatitidis; Coccidiodes immitis; Pseudallescheria boydii; Penicillium marneffei; and various other yeasts and fungi.

Candida krusei, Candida glabrata and Candida tropicalis are generally the least susceptible Candida species, with some isolates showing unequivocal resistance to itraconazole in vitro.

The principal fungus types that are not inhibited by itraconazole are Zygomycetes (e.g. Rhizopus spp., Rhizomucor spp., Mucor spp. and Absidia spp.), Fusarium spp., Scedosporium proliferans and Scopulariopsis spp.

Azole resistance appears to develop slowly and is often the result of several genetic mutations. Mechanisms that have been described are overexpression of ERG11, which encodes the target enzyme 14α-demethylase, point mutations in ERG11 that lead to decreased target affinity and/or transporter overexpression resulting in increased efflux. Cross resistance between members of the azole class has been observed within Candida spp., although resistance to one member of the class does not necessarily confer resistance to other azoles. Itraconazole-resistant strains of Aspergillus fumigatus have been reported.

Use in patients with renal impairment

Limited data are available on the use of oral Isox (Itraconazole) in patients with renal impairment. Caution should be exercised when this drug is administered in this patient population.

Isox (Itraconazole) oral solution is contraindicated in patients with a known hypersensitivity to Isox (Itraconazole) or to any of the excipients.

Co-administration of the following drugs is contraindicated with Isox (Itraconazole) oral solution (see also 4.5 Interaction with other medicinal products and other forms of interaction):

- CYP3A4 metabolised substrates that can prolong the QT-interval e.g., astemizole, bepridil, cisapride, dofetilide, levacetylmethadol (levomethadyl), mizolastine, pimozide, quinidine, sertindole and terfenadine are contraindicated with Isox (Itraconazole) oral solution.).

Cross-hypersensitivity

There is no information regarding cross hypersensitivity between Isox (Itraconazole) and other azole antifungal agents. Caution should be used in prescribing Isox (Itraconazole) Oral Solution to patients with hypersensitivity to other azoles.

Cardiac effects

In a healthy volunteer study with Isox (Itraconazole) IV, a transient asymptomatic decrease of the left ventricular ejection fraction was observed.

Isox (Itraconazole) has been shown to have a negative inotropic effect and has been associated with reports of congestive heart failure. Interaction with other medicinal products).

Hepatic effects

Very rare cases of serious hepatotoxicity, including some cases of fatal acute liver failure, have occurred with the use of Isox (Itraconazole). Some of these cases involved patients with no pre-existing liver disease. Some of these cases have been observed within the first month of treatment, including some within the first week. Liver function monitoring should be considered in patients receiving Isox (Itraconazole) treatment. Patients should be instructed to promptly report to their physician signs and symptoms suggestive of hepatitis such as anorexia, nausea, vomiting, fatigue, abdominal pain or dark urine. In these patients treatment should be stopped immediately and liver function testing should be conducted. Most cases of serious hepatotoxicity involved patients who had pre-existing liver disease, were treated for systemic indications, had significant other medical conditions and/or were taking other hepatotoxic drugs. In patients with raised liver enzymes or active liver disease, or who have experienced liver toxicity with other drugs, treatment should not be started unless the expected benefit exceeds the risk of hepatic injury. In patients with impaired hepatic function liver enzyme should be carefully monitored when taking Isox (Itraconazole).

Use in children

Since clinical data on the use of Isox (Itraconazole) oral solution in paediatric patients is limited, its use in children is not recommended unless the potential benefit outweighs the potential risks.

Use in elderly

Since clinical data on the use of Isox (Itraconazole) oral solution in elderly patients is limited, it is advised to use Isox (Itraconazole) oral solution in these patients only if the potential benefit outweighs the potential risks.

Hepatic impairment

Limited data are available on the use of oral Isox (Itraconazole) in patients with hepatic impairment. Caution should be exercised when the drug is administered in this patient population. (See 5.2 Pharmacokinetic properties, Special populations, Hepatic impairment)

Renal impairment

Limited data are available on the use of oral Isox (Itraconazole) in patients with renal impairment. Caution should be exercised when this drug is administered in this patient population.

Prophylaxis in neutropenic patients

In clinical trials diarrhoea was the most frequent adverse event. This disturbance of the gastrointestinal tract may result in impaired absorption and may alter the microbiological flora potentially favouring fungal colonisation. Consideration should be given to discontinuing Isox (Itraconazole) oral solution in these circumstances.

Treatment of severely neutropenic patients

Isox (Itraconazole) oral solution as treatment for oral and/or esophageal candidosis was not investigated in severely neutropenic patients. Due to the pharmacokinetic properties (See 5.2 Pharmacokinetic properties), Isox (Itraconazole) oral solution is not recommended for initiation of treatment in patients at immediate risk of systemic candidosis.

Hearing Loss

Transient or permanent hearing loss has been reported in patients receiving treatment with Isox (Itraconazole). Several of these reports included concurrent administration of quinidine which is contraindicated. The hearing loss usually resolves when treatment is stopped, but can persist in some patients.

Neuropathy

If neuropathy occurs that may be attributable to Isox (Itraconazole) oral solution, the treatment should be discontinued.

Cross-resistance

In systemic candidosis, if fluconazole-resistant strains of Candida species are suspected, it cannot be assumed that these are sensitive to Isox (Itraconazole), hence their sensitivity should be tested before the start of Isox (Itraconazole) therapy

Interaction potential

Isox (Itraconazole) Oral Solution has a potential for clinically important drug interactions.

Isox (Itraconazole) should not be used within 2 weeks after discontinuation of treatment with CYP 3A4 inducing agents (rifampicin, rifabutin, phenobarbital, phenytoin, carbamazepine, Hypericum perforatum (St. John´s wort)). The use of Isox (Itraconazole) with these drugs may lead to subtherapeutic plasma levels of Isox (Itraconazole) and thus treatment failure.

Isox (Itraconazole) oral solution contains sorbitol. Patients with rare hereditary problems of fructose intolerance should not take this medicine. Also contains ethanol less than 100mg per dose.

4.5.1. Drugs affecting the metabolism of Isox (Itraconazole):

Isox (Itraconazole) is mainly metabolised through the cytochrome CYP3A4. Interaction studies have been performed with rifampicin, rifabutin and phenytoin, which are potent enzyme inducers of CYP3A4. Since the bioavailability of Isox (Itraconazole) and hydroxy-Isox (Itraconazole) was decreased in these studies to such an extent that efficacy may be largely reduced, the combination of Isox (Itraconazole) with these potent enzyme inducers is not recommended. No formal study data are available for other enzyme inducers, such as carbamazepine, Hypericum perforatum (St John's Wort), phenobarbital and isoniazid, but similar effects should be anticipated.

Potent inhibitors of this enzyme such as ritonavir, indinavir, clarithromycin and erythromycin may increase the bioavailability of Isox (Itraconazole).

4.5.2. Effect of Isox (Itraconazole) on the metabolism of other drugs:

4.5.2.1 Isox (Itraconazole) can inhibit the metabolism of drugs metabolised by the cytochrome 3A family. Pharmacokinetic Properties). This should be taken into account when the inhibitory effect of Isox (Itraconazole) on co-medicated drugs is considered.

The following drugs are contraindicated with Isox (Itraconazole):

- Astemizole, bepridil, cisapride, dofetilide, levacetylmethadol (levomethadyl), mizolastine, pimozide, quinidine, sertindole and terfenadine are contraindicated with Isox (Itraconazole) oral solution since co-administration may result in increased plasma concentrations of these substrates, which can lead to QT prolongation and rare occurrences of torsade de pointes.

- CYP3A4 metabolized HMG-CoA reductase inhibitors such as atorvastatin, lovastatin and simvastatin.

- Triazolam and oral midazolam.

- Ergot alkaloids such as dihydroergotamine, ergometrine (ergonovine), ergotamine and methylergometrine (methylergonovine).

- Eletriptan

- Nisoldipine

Caution should be exercised when co-administering Isox (Itraconazole) with calcium channel blockers due to an increased risk of congestive heart failure. In addition to possible pharmacokinetic interactions involving the drug metabolising enzyme CYP3A4, calcium channel blockers can have negative inotropic effects which may be additive to those of Isox (Itraconazole).

The following drugs should be used with caution, and their plasma concentrations, effects or side effects should be monitored. Their dosage, if co-administered with Isox (Itraconazole), should be reduced if necessary:

- Oral anticoagulants;

- HIV protease inhibitors such as ritonavir, indinavir, saquinavir;

- Certain antineoplastic agents such as busulfan, docetaxel, trimetrexate and vinca alkaloids;

- CYP3A4 metabolised calcium channel blockers such as dihydropyridines and verapamil;

- Certain immunosuppressive agents: ciclosporin, tacrolimus, rapamycin (also known as sirolimus);

- Certain glucocorticosteroids such as budesonide, dexamethasone, fluticasone and methylprednisolone;

- Digoxin (via inhibition of P-glycoprotein)

- Others: cilostazol, disopyramide, carbamazepine, buspirone, alfentanil, alprazolam, brotizolam, midazolam IV, rifabutin, ebastine, repaglinide, fentanyl, halofantrine, reboxetine and loperamide. The importance of the concentration increase and the clinical relevance of these changes during the co-administration with Isox (Itraconazole) remain to be established.

4.5.2.2 No interaction of Isox (Itraconazole) with zidovudine (AZT) and fluvastatin has been observed.

No inducing effects of Isox (Itraconazole) on the metabolism of ethinyloestradiol and norethisterone were observed.

4.5.3. Effect on protein binding:

In vitro studies have shown that there are no interactions on the plasma protein binding between Isox (Itraconazole) and imipramine, propranolol, diazepam, cimetidine, indometacin, tolbutamide and sulfamethazine.

Pregnancy:

Isox (Itraconazole) oral solution must not be used during pregnancy except for life-threatening cases where the potential benefit to the mother outweighs the potential harm to the foetus (see 4.3 Contraindications).

In animal studies Isox (Itraconazole) has shown reproduction toxicity (see

General pharmacokinetic characteristics

Peak plasma concentrations of itraconazole are reached within 2 to 5 hours following oral administration. As a consequence of non-linear pharmacokinetics, itraconazole accumulates in plasma during multiple dosing. Steady-state concentrations are generally reached within about 15 days, with C_max values of 0.5 µg/ml, 1.1 µg/ml and 2.0 µg/ml after oral administration of 100 mg once daily, 200 mg once daily and 200 mg b.i.d., respectively. The terminal half-life of itraconazole generally ranges from 16 to 28 hours after single dose and increases to 34 to 42 hours with repeated dosing. Once treatment is stopped, itraconazole plasma concentrations decrease to an almost undetectable concentration within 7 to 14 days, depending on the dose and duration of treatment. Itraconazole mean total plasma clearance following intravenous administration is 278 ml/min. Itraconazole clearance decreases at higher doses due to saturable hepatic metabolism.

Absorption

Distribution

Most of the itraconazole in plasma is bound to protein (99.8%) with albumin being the main binding component (99.6% for the hydroxy- metabolite). It has also a marked affinity for lipids. Only 0.2% of the itraconazole in plasma is present as free drug. Itraconazole is distributed in a large apparent volume in the body (> 700 L), suggesting its extensive distribution into tissues: Concentrations in lung, kidney, liver, bone, stomach, spleen and muscle were found to be two to three times higher than corresponding concentrations in plasma, and the uptake into keratinous tissues, skin in particular, is up to four times higher than in plasma. Concentrations in the cerebrospinal fluid are much lower than in plasma, but efficacy has been demonstrated against infections present in the cerebrospinal fluid.

Metabolism

Itraconazole is extensively metabolised by the liver into a large number of metabolites. In vitro studies have shown that CYP3A4 is the major enzyme involved in the metabolism of itraconazole. The main metabolite is hydroxy-itraconazole, which has in vitro antifungal activity comparable to Itraconazole; trough plasma concentrations of the hydroxy-itraconazole are about twice those of itraconazole.

Excretion

Itraconazole is excreted mainly as inactive metabolites in urine (35%) and faeces (54%) within one week of an oral solution dose. Renal excretion of itraconazole and the active metabolite hydroxy-itraconazole account for less than 1% of an intravenous dose.Based on an oral radiolabelled dose, faecal excretion of unchanged drug varies between 3 - 18% of the dose.

Special Populations

Paediatrics:

Limited pharmacokinetic data are available on the use of itraconazole in the paediatric population. Clinical pharmacokinetic studies in children and adolescents aged between 5 months and 17 years were performed with itraconazole capsules, oral solution or intravenous formulation. Individual doses with the capsule and oral solution formulation ranged from 1.5 to 12.5 mg/kg/day, given as once-daily or twice-daily administration. The intravenous formulation was given either as a 2.5 mg/kg single infusion, or a 2.5 mg/kg infusion given once daily or twice daily. For the same daily dose, twice daily dosing compared to single daily dosing yielded peak and trough concentrations comparable to adult single daily dosing. No significant age dependence was observed for itraconazole AUC and total body clearance, while weak associations between age and itraconazole distribution volume, C_max and terminal elimination rate were noted. Itraconazole apparent clearance and distribution volume seemed to be related to weight.

Epidemiological data on exposure to Isox (Itraconazole) during the first trimester of pregnancy - mostly in patients receiving short-term treatment for vulvovaginal candidosis - did not show an increased risk for malformations as compared to control subjects not exposed to any known teratogens.

Women of child-bearing potential:

Women of childbearing potential taking Isox (Itraconazole) oral solution should use contraceptive precautions. Effective contraception should be continued until the next menstrual period following the end of Isox (Itraconazole) therapy.

Fertility:

In the rat, Isox (Itraconazole) had no effect on male or female fertility at doses which exhibited signs of general toxicity. The effect in humans is unknown.

Lactation:

A very small amount of Isox (Itraconazole) is excreted in human milk. Isox (Itraconazole) Oral Solution must not be used during lactation.

No studies on the effects on the ability to drive and use machines have been performed.

When driving vehicles and operating machinery the possibility of adverse reactions such as dizziness, visual disturbances and hearing loss , which may occur in some instances, must be taken into account.

Approximately 9% of patients can be expected to experience adverse reactions while taking Isox (Itraconazole). In patients receiving prolonged (approximately 1 month) continuous treatment especially, the incidence of adverse events has been higher (about 15%). The most frequently reported adverse experiences have been of gastrointestinal, hepatic and dermatological origin.

The table below presents adverse drug reactions by System Organ Class. Within each System Organ Class, the adverse drug reactions are presented by incidence, using the following convention:

Very common ( > 1/10); Common ( > 1/100 to < 1/10); Uncommon ( > 1/1,000 to < 1/100); Rare ( > 1/10,000 to < 1/1,000); Very rare (< 1/10,000), Not known (cannot be estimated from the available data).

Adverse Drug Reactions
Blood and lymphatic system disorders
Uncommon	Leucopenia, Neutropenia, Thrombocytopenia
Immune system disorders
Not Known	Serum Sickness, Angioneurotic Oedema, Anaphylactic Reaction, Anaphylactoid Reaction, Hypersensitivity*
Metabolism and nutrition disorders
Uncommon	Hypokalaemia
Not Known	Hypertriglyceridemia
Nervous system disorders
Common	Headache
Uncommon	Peripheral Neuropathy*, Dizziness
Not Known	Paraesthesia, Hypoaesthesia
Eye disorders
Uncommon	Visual Disorders, including Vision Blurred and Diplopia
Ear and labyrinth disorder
Not Known	Tinnitus; Transient or permanent hearing loss*
Cardiac disorders
Not Known	Congestive Heart Failure*
Respiratory, thoracic and mediastinal disorders
Common	Dyspnoea
Not Known	Pulmonary Oedema
Gastrointestinal disorders
Common	Abdominal Pain, Vomiting, Nausea, Diarrhoea, Dysgeusia
Uncommon	Dyspepsia, Constipation
Not Known	Pancreatitis
Hepato-biliary disorders
Common	Hepatic enzyme increased
Uncommon	Hepatitis, Hyperbilirubinaemia
Not Known	Hepatotoxicity*, Acute hepatic failure*
Skin and subcutaneous tissue disorders
Common	Rash
Uncommon	Pruritus
Not Known	Toxic epidermal necrolysis, Stevens-Johnson syndrome, acute generalised exanthematous pustulosis, erythema multiforme, exfoliative dermatitis, leukocytoclastic vasculitis, urticaria, alopecia, photosensitivity
Musculoskeletal and connective tissue disorders
Not Known	Myalgia, arthralgia
Renal and urinary disorders
Not Known	Pollakiuria, urinary incontinence
Reproductive system and breast disorders
Not Known	Menstrual disorders, erectile dysfunction
General disorders and administration site conditions
Common	Pyrexia
Uncommon	Oedema Paediatric Population The safety of Isox (Itraconazole) oral solution was evaluated in 250 paediatric patients aged 6 months to 14 years who participated in five open-label clinical trials. These patients received at least one dose of Isox (Itraconazole) for prophylaxis of fungal infections or for treatment of oral thrush or systemic fungal infections and provided safety data. Based on pooled safety data from these clinical trials, the very common reported ADRs in paediatric patients were Vomiting (36.0%), Pyrexia (30.8%), Diarrhoea (28.4%), Mucosal inflammation (23.2%), Rash (22.8%), Abdominal pain (17.2%), Nausea (15.6%), Hypertension (14.0%), and Cough (11.2%). The nature of ADRs in paediatric patients is similar to that observed in adult subjects, but the incidence is higher in the paediatric 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 following: UK: Yellow Card Scheme at: www.mhra.gov.uk/yellowcard. IE: HPRA Pharmacovigilance, Earlsfort Terrace, IRL - Dublin 2; Tel: +353 1 6764971; Fax: +353 1 6762517. Website: www.hpra.ie; E-mail: [email protected]. 4.9 Overdose Symptoms: In general, adverse events reported with overdose have been consistent with adverse drug reactions already listed in this SmPC for Isox (Itraconazole). Treatment: In the event of an overdose, supportive measures should be employed. Activated charcoal may be given if considered appropriate. Isox (Itraconazole) cannot be removed by haemodialysis. No specific antidote is available. 5. Pharmacological properties 5.1 Pharmacodynamic properties Pharmacotherapeutic group: Antimycotic for systemic use, triazole derivative. ATC code: J02A C02 Mode of action Isox (Itraconazole) inhibits fungal 14α-demethylase, resulting in a depletion of ergosterol and disruption of membrane synthesis by fungi. PK/PD relationship The PK/PD relationship for Isox (Itraconazole), and for triazoles in general, is poorly understood and is complicated by limited understanding of antifungal pharmacokinetics. Mechanism(s) of resistance Resistance of fungi to azoles appears to develop slowly and is often the result of several genetic mutations. Mechanisms that have been described are - Over-expression of ERG11, the gene that encodes 14-alpha-demethylase (the target enzyme) - Point mutations in ERG11 that lead to decreased affinity of 14-alpha-demethylase for Isox (Itraconazole) - Drug-transporter over-expression resulting in increased efflux of Isox (Itraconazole) from fungal cells (i.e., removal of Isox (Itraconazole) from its target) - Cross-resistance. Cross-resistance amongst members of the azole class of drugs has been observed within Candida species though resistance to one member of the class does not necessarily confer resistance to other azoles. Breakpoints Breakpoints for candida species are in preparation. Aspergillus Species1 MIC breakpoint (mg/L) ≤ S (Susceptible) >R (Resistant) Aspergillus flavus 1 2 Aspergillus fumigatus 1 2 Aspergillus nidulans 1 2 Aspergillus niger Insufficient evidence Aspergillus terreus Insufficient evidence Non species related breakpoints2 Insufficient evidence 1monitoring of Isox (Itraconazole) trough concentrations in patients treated for fungal infection is recommended 2 The MIC values for isolates of A.niger and A.versicolor are in general higher than those for A.fumigatus. Whether this translates into a poorer clinical response is unknown The prevalence of acquired resistance may vary geographically and with time for selected species, and local information on resistance is desirable, particularly when treating severe infections. As necessary, expert advice should be sought when the local prevalence of resistance is such that the utility of the agent in at least some types of infections is questionable. The in vitro susceptibility of fungi to Isox (Itraconazole) depends on the inoculum size, incubation temperature, growth phase of the fungi, and the culture medium used. For these reasons, the minimum inhibitory concentration of Isox (Itraconazole) may vary widely. Susceptibility in the table below is based on MIC90 < 1 mg Isox (Itraconazole)/L. There is no correlation between in vitro susceptibility and clinical efficacy. Commonly susceptible species Aspergillus spp.2 Blastomyces dermatitidis1 Candida albicans Candida parapsilosis Cladosporium spp. Coccidioides immitis1 Cryptococcus neoformans Epidermophyton floccosum Fonsecaea spp. 1 Geotrichum spp. Histoplasma spp. Malassezia (formerly Pityrosporum) spp. Microsporum spp. Paracoccidioides brasiliensis1 Penicillium marneffei1 Pseudallescheria boydii Sporothrix schenckii Trichophyton spp. Trichosporon spp. Species for which acquired resistance may be a problem Candida glabrata3 Candida krusei Candida tropicalis3 Inherently resistant organisms Absidia spp. Fusarium spp. Mucor spp. Rhizomucor spp. Rhizopus spp. Scedosporium proliferans Scopulariopsis spp. 1 These organisms may be encountered in patients who have returned from travel outside Europe. 2 Isox (Itraconazole)-resistant strains of Aspergillus fumigatus have been reported. 3 Natural intermediate susceptibility. Paediatric Population The tolerability and safety of Isox (Itraconazole) oral solution was studied in the prophylaxis of fungal infections in 103 neutropenic paediatric patients aged 0 to14 years (median 5 years) in an open-label uncontrolled phase III clinical study. Most patients (78%) were undergoing allogenic bone marrow transplantation for haematological malignancies. All patients received 5 mg/kg/day of Isox (Itraconazole) oral solution as a single or divided dose. Due to the design of the study, no formal conclusion with regard to efficacy could be derived. The most common adverse events considered definitely or possibly related to Isox (Itraconazole) were vomiting, abnormal liver function, and abdominal pain. 5.2 Pharmacokinetic properties Isox (Itraconazole) General pharmacokinetic characteristics Peak plasma concentrations are reached within 2.5 hours following administration of the oral solution. As a consequence of non-linear pharmacokinetics, Isox (Itraconazole) accumulates in plasma during multiple dosing. Steady-state concentrations are generally reached within about 15 days, with Cmax and AUC values 4 to 7-fold higher than those seen after a single dose. Steady-state Cmax values of about 2 μg/ml are reached after oral administration of 200 mg once daily. The terminal half-life of Isox (Itraconazole) generally ranges from 16 to 28 hours after single dose and increases to 34 to 42 hours with repeated dosing. Once treatment is stopped, Isox (Itraconazole) plasma concentrations decrease to an almost undetectable concentration within 7 to 14 days, depending on the dose and duration of treatment. Isox (Itraconazole) mean total plasma clearance following intravenous administration is 278 ml /min. Isox (Itraconazole) clearance decreases at higher doses due to saturable hepatic metabolism. Absorption Isox (Itraconazole) is rapidly absorbed after administration of the oral solution. Peak plasma concentrations of the unchanged drug are reached within 2.5 hours following an oral dose under fasting conditions. The observed absolute bioavailability of Isox (Itraconazole) under fed conditions is about 55% and increases by 30 % when the oral solution is taken in fasting conditions. Isox (Itraconazole) exposure is greater with the oral solution than with the capsule formulation when the same dose of drug is given.. Distribution Most of the Isox (Itraconazole) in plasma is bound to protein (99.8%) with albumin being the main binding component (99.6% for the hydroxy- metabolite). It has also a marked affinity for lipids. Only 0.2% of the Isox (Itraconazole) in plasma is present as free drug. Isox (Itraconazole) is distributed in a large apparent volume in the body (> 700 L), suggesting its extensive distribution into tissues: Concentrations in lung, kidney, liver, bone, stomach, spleen and muscle were found to be two to three times higher than corresponding concentrations in plasma, and the uptake into keratinous tissues, skin in particular, up to four times higher. Concentrations in the cerebrospinal fluid are much lower than in plasma, but efficacy has been demonstrated against infections present in the cerebrospinal fluid. Metabolism Isox (Itraconazole) is extensively metabolised by the liver into a large number of metabolites. The main metabolite is hydroxy-Isox (Itraconazole), which has in vitro antifungal activity comparable to Isox (Itraconazole). Trough plasma concentrations of the hydroxy-Isox (Itraconazole) are about twice those of Isox (Itraconazole). As shown in in vitro studies, CYP 3A4 is the major enzyme that is involved in the metabolism of Isox (Itraconazole). Elimination Isox (Itraconazole) is excreted mainly as inactive metabolites to about 35% in urine and to about 54% with faeces within one week of an oral solution dose. Renal excretion of Isox (Itraconazole) and the active metabolite hydroxy-Isox (Itraconazole) account for less than 1% of an intravenous dose. Based on an oral radiolabeled dose, faecal excretion of unchanged drug ranges from 3% to 18% of the dose. As re-distribution of Isox (Itraconazole) from keratinous tissues appears to be negligible, elimination of Isox (Itraconazole) from these tissues is related to epidermal regeneration. Contrary to plasma, the concentration in skin persists for 2 to 4 weeks after discontinuation of a 4-week treatment and in nail keratin - where Isox (Itraconazole) can be detected as early as 1 week after start of treatment - for at least six months after the end of a 3-month treatment period. Special Populations Hepatic Impairment: Isox (Itraconazole) is predominantly metabolised in the liver. A pharmacokinetic study using a single 100 mg dose of Isox (Itraconazole) (one 100 mg capsule) was conducted in 6 healthy and 12 cirrhotic subjects. A statistically significant reduction in average Cmax (47%) and a two fold increase in the elimination half-life (37 ± 17 versus 16 ±5 hours) of Isox (Itraconazole) were noted in cirrhotic subjects compared with healthy subjects. However, overall exposure to Isox (Itraconazole), based on AUC, was similar in cirrhotic patients and in healthy subjects.Data are not available in cirrhotic patients during long-term use of Isox (Itraconazole). Renal Impairment: Limited data are available on the use of oral Isox (Itraconazole) in patients with renal impairment. A pharmacokinetic study using a single 200-mg dose of Isox (Itraconazole) (four 50-mg capsules) was conducted in three groups of patients with renal impairment (uremia: n=7; hemodialysis: n=7; and continuous ambulatory peritoneal dialysis: n=5). In uremic subjects with a mean creatinine clearance of 13 ml/min. × 1.73 m2, the exposure, based on AUC, was slightly reduced compared with normal population parameters. This study did not demonstrate any significant effect of hemodialysis or continuous ambulatory peritoneal dialysis on the pharmacokinetics of Isox (Itraconazole) (Tmax, Cmax, and AUC0-8h). Plasma concentration-versus-time profiles showed wide intersubject variation in all three groups. After a single intravenous dose, the mean terminal half-lives of Isox (Itraconazole) in patients with mild (defined in this study as CrCl 50-79 ml/min), moderate (defined in this study as CrCl 20-49 ml/min), and severe renal impairment (defined in this study as CrCl <20 ml/min) were similar to that in healthy subjects (range of means 42-49 hours vs 48 hours in renally impaired patients and healthy subjects, respectively). Overall exposure to Isox (Itraconazole), based on AUC, was decreased in patients with moderate and severe renal impairment by approximately 30% and 40%, respectively, as compared with subjects with normal renal function. Data are not available in renally impaired patients during long-term use of Isox (Itraconazole). Dialysis has no effect on the half-life or clearance of Isox (Itraconazole) or hydroxy-Isox (Itraconazole). Paediatric Population: Two pharmacokinetic studies have been conducted in neutropenic children aged 6 months to 14 years in which Isox (Itraconazole) oral solution was administered 5 mg/kg once or twice daily. The exposure to Isox (Itraconazole) was somewhat higher in older children (6 to 14 years) compared to younger children. In all children, effective plasma concentrations of Isox (Itraconazole) were reached within 3 to 5 days after initiation of treatment and maintained throughout treatment. Hydroxypropyl-ß-Cyclodextrin The oral bioavailability of hydroxypropyl-β-cyclodextrin given as a solubilizer of Isox (Itraconazole) in oral solution is on average lower than 0.5% and is similar to that of hydroxypropyl-β-cyclodextrin alone. This low oral bioavailability of hydroxypropyl-β-cyclodextrin is not modified by the presence of food and is similar after single and repeated administrations. 5.3 Preclinical safety data Isox (Itraconazole) Nonclinical data on Isox (Itraconazole) revealed no indications for genotoxicity, primary carcinogenicity or impairment of fertility. At high doses, effects were observed in the adrenal cortex, liver and the mononuclear phagocyte system but appear to have a low relevance for the proposed clinical use. Isox (Itraconazole) was found to cause a dose-related increase in maternal toxicity, embryotoxicity and teratogenicity in rats and mice at high doses. A global lower bone mineral density was observed in juvenile dogs after chronic Isox (Itraconazole) administration, and in rats, a decreased bone plate activity, thinning of the zona compacta of the large bones, and an increased bone fragility was observed. Hydroxypropyl-β-cyclodextrin Non-clinical data reveal no special hazard for humans based on conventional studies of repeated dose toxicity, genotoxicity, and toxicity to reproduction and development. In a rat carcinogenicity study hydroxypropyl-β-cyclodextrin produced adenocarcinomas in the large intestine and exocrine pancreatic adenocarcinomas. These findings were not observed in a similar mouse carcinogenicity study. The clinical relevance of the large intestine adenocarcinomas is low and the mechanism of exocrine pancreatic adenocarcinomas induction not considered relevant to humans. Nonclinical data on itraconazole revealed no indications for gene toxicity, primary carcinogenicity or impairment of fertility. At high doses, effects were observed in the adrenal cortex, liver and the mononuclear phagocyte system but appear to have a low relevance for the proposed clinical use. Itraconazole was found to cause a dose-related increase in maternal toxicity, embryotoxicity and teratogenicity in rats and mice at high doses. A global lower bone mineral density was observed in juvenile dogs after chronic itraconazole administration, and in rats, a decreased bone plate activity, thinning of the zona compacta of the large bones, and an increased bone fragility was observed. Incompatibilities The information provided in Incompatibilities of Isox (Itraconazole) is based on data of another medicine with exactly the same composition as the Isox (Itraconazole). . Be careful and be sure to specify the information on the section Incompatibilities in the instructions to the drug Isox (Itraconazole) directly from the package or from the pharmacist at the pharmacy. more... Capsules; Pellets; Substance-pellets; Substance-powder Capsule, hard In the absence of compatibility studies, this medicinal product must not be mixed with other medicinal products. Not applicable. Special precautions for disposal and other handling The information provided in Special precautions for disposal and other handling of Isox (Itraconazole) is based on data of another medicine with exactly the same composition as the Isox (Itraconazole). . Be careful and be sure to specify the information on the section Special precautions for disposal and other handling in the instructions to the drug Isox (Itraconazole) directly from the package or from the pharmacist at the pharmacy. more... Capsules; Pellets; Substance-pellets; Substance-powder Capsule, hard Any unused product or waste material should be disposed of in accordance with local requirements. No special requirements. Isox (Itraconazole) price We have no data on the cost of the drug. However, we will provide data for each active ingredient The approximate cost of Itraconazole 100 mg per unit in online pharmacies is from 0.8$ to 3.67$, per package is from 26$ to 156$. References: https://www.drugs.com/search.php?searchterm=isox-itraconazole https://pubmed.ncbi.nlm.nih.gov/?term=isox-itraconazole Available in countries Dominican Republic El Salvador Guatemala Honduras Mexico Panama Find in a country: A B C D E F G H I J K L M N O P Q R S T U V Y Z