英文药名:Exjade(Deferasirox dispersible Tablets) 中文药名:地拉罗斯片(去铁斯若) 生产厂家:德国诺华公司
Caution should be used in elderly patients due to a higher frequency of adverse reactions (in particular, diarrhoea). Data in children with non-transfusion-dependent thalassaemia are very limited (see section 5.1). As a consequence, EXJADE therapy should be closely monitored to detect side effects and to follow iron burden in the paediatric population. In addition, before treating heavily iron-overloaded children with non-transfusion-dependent thalassaemia with EXJADE, the physician should be aware that the consequences of long-term exposure in such patients are currently not known. Gastrointestinal Upper gastrointestinal ulceration and haemorrhage have been reported in patients, including children and adolescents, receiving EXJADE. Multiple ulcers have been observed in some patients (see section 4.8). There have been reports of ulcers complicated with digestive perforation. Also, there have been reports of fatal gastrointestinal haemorrhages, especially in elderly patients who had haematological malignancies and/or low platelet counts. Physicians and patients should remain alert for signs and symptoms of gastrointestinal ulceration and haemorrhage during EXJADE therapy and promptly initiate additional evaluation and treatment if a serious gastrointestinal adverse reaction is suspected. Caution should be exercised in patients who are taking EXJADE in combination with substances that have known ulcerogenic potential, such as NSAIDs, corticosteroids, or oral bisphosphonates, in patients receiving anticoagulants and in patients with platelet counts below 50,000/mm3 (50 x 109/l) (see section 4.5). Skin disorders Skin rashes may appear during EXJADE treatment. The rashes resolve spontaneously in most cases. When interruption of treatment may be necessary, treatment may be reintroduced after resolution of the rash, at a lower dose followed by gradual dose escalation. In severe cases this reintroduction could be conducted in combination with a short period of oral steroid administration. Cases of Stevens-Johnson syndrome (SJS) have been reported post marketing. The risk of other more severe skin reactions (TEN [toxic epidermal necrolysis], DRESS [drug reaction with eosinophilia and systemic symptoms]) cannot be excluded. If SJS or any other severe skin reaction is suspected, EXJADE should be discontinued immediately and should not be reintroduced. Hypersensitivity reactions Cases of serious hypersensitivity reactions (such as anaphylaxis and angioedema) have been reported in patients receiving EXJADE, with the onset of the reaction occurring in the majority of cases within the first month of treatment (see section 4.8). If such reactions occur, EXJADE should be discontinued and appropriate medical intervention instituted. Vision and hearing Auditory (decreased hearing) and ocular (lens opacities) disturbances have been reported (see section 4.8). Auditory and ophthalmic testing (including fundoscopy) is recommended before the start of treatment and at regular intervals thereafter (every 12 months). If disturbances are noted during the treatment, dose reduction or interruption may be considered. Blood disorders There have been post-marketing reports of leukopenia, thrombocytopenia or pancytopenia (or aggravation of these cytopenias) and of aggravated anaemia in patients treated with EXJADE. Most of these patients had pre-existing haematological disorders that are frequently associated with bone marrow failure. However, a contributory or aggravating role cannot be excluded. Interruption of treatment should be considered in patients who develop unexplained cytopenia. Other considerations Monthly monitoring of serum ferritin is recommended in order to assess the patient's response to therapy (see section 4.2). If serum ferritin falls consistently below 500 µg/l (in transfusional iron overload) or below 300 µg/l (in non-transfusion-dependent thalassaemia syndromes), an interruption of treatment should be considered. The results of the tests for serum creatinine, serum ferritin and serum transaminases should be recorded and regularly assessed for trends. The results should also be noted in the provided patient's booklet. In one clinical study, growth and sexual development of paediatric patients treated with EXJADE for up to 5 years were not affected. However, as a general precautionary measure in the management of paediatric patients with transfusional iron overload, body weight, height and sexual development should be monitored at regular intervals (every 12 months). Cardiac dysfunction is a known complication of severe iron overload. Cardiac function should be monitored in patients with severe iron overload during long-term treatment with EXJADE. Each tablet contains 136 mg lactose. Patients with rare hereditary problems of galactose intolerance, the Lapp lactase deficiency, glucose-galactose malabsorption or severe lactase deficiency should not take this medicine. 4.5 Interaction with other medicinal products and other forms of interaction The safety of EXJADE in combination with other iron chelators has not been established. Therefore, it must not be combined with other iron chelator therapies (see section 4.3). The concomitant administration of EXJADE with substances that have known ulcerogenic potential, such as NSAIDs (including acetylsalicylic acid at high dosage), corticosteroids or oral bisphosphonates may increase the risk of gastrointestinal toxicity (see section 4.4). The concomitant administration of EXJADE with anticoagulants may also increase the risk of gastrointestinal haemorrhage. Close clinical monitoring is required when deferasirox is combined with these substances. The bioavailability of deferasirox was increased to a variable extent when taken along with food. EXJADE must therefore be taken on an empty stomach at least 30 minutes before food, preferably at the same time each day (see sections 4.2 and 5.2). Deferasirox metabolism depends on UGT enzymes. In a healthy volunteer study, the concomitant administration of EXJADE (single dose of 30 mg/kg) and the potent UGT inducer, rifampicin, (repeated dose of 600 mg/day) resulted in a decrease of deferasirox exposure by 44% (90% CI: 37% - 51%). Therefore, the concomitant use of EXJADE with potent UGT inducers (e.g. rifampicin, carbamazepine, phenytoin, phenobarbital, ritonavir) may result in a decrease in EXJADE efficacy. The patient's serum ferritin should be monitored during and after the combination, and the dose of EXJADE adjusted if necessary. Cholestyramine significantly reduced the deferasirox exposure in a mechanistic study to determine the degree of enterohepatic recycling (see section 5.2). In a healthy volunteer study, the concomitant administration of EXJADE and midazolam (a CYP3A4 probe substrate) resulted in a decrease of midazolam exposure by 17% (90% CI: 8% - 26%). In the clinical setting, this effect may be more pronounced. Therefore, due to a possible decrease in efficacy, caution should be exercised when deferasirox is combined with substances metabolised through CYP3A4 (e.g. ciclosporin, simvastatin, hormonal contraceptive agents, bepridil, ergotamine). In a healthy volunteer study, the concomitant administration of deferasirox as a moderate CYP2C8 inhibitor (30 mg/kg daily), with repaglinide, a CYP2C8 substrate, given as a single dose of 0.5 mg, increased repaglinide AUC and Cmax about 2.3-fold (90% CI [2.03-2.63]) and 1.6-fold (90% CI [1.42-1.84]), respectively. Since the interaction has not been established with dosages higher than 0.5 mg for repaglinide, the concomitant use of deferasirox with repaglinide should be avoided. If the combination appears necessary, careful clinical and blood glucose monitoring should be performed (see section 4.4). An interaction between deferasirox and other CYP2C8 substrates like paclitaxel cannot be excluded. In a healthy volunteer study, the concomitant administration of EXJADE as a CYP1A2 inhibitor (repeated dose of 30 mg/kg/day) and the CYP1A2 substrate theophylline (single dose of 120 mg) resulted in an increase of theophylline AUC by 84% (90% CI: 73% to 95%). The single dose Cmax was not affected, but an increase of theophylline Cmax is expected to occur with chronic dosing. Therefore, the concomitant use of EXJADE with theophylline is not recommended. If EXJADE and theophylline are used concomitantly, monitoring of theophylline concentration and theophylline dose reduction should be considered. An interaction between EXJADE and other CYP1A2 substrates cannot be excluded. For substances that are predominantly metabolised by CYP1A2 and that have a narrow therapeutic index (e.g. clozapine, tizanidine), the same recommendations apply as for theophylline. The concomitant administration of EXJADE and aluminium-containing antacid preparations has not been formally studied. Although deferasirox has a lower affinity for aluminium than for iron, it is not recommended to take EXJADE tablets with aluminium-containing antacid preparations. The concomitant administration of EXJADE and vitamin C has not been formally studied. Doses of vitamin C up to 200 mg per day have not been associated with adverse consequences. No interaction was observed between EXJADE and digoxin in healthy adult volunteers. 4.6 Fertility, pregnancy and lactation Pregnancy No clinical data on exposed pregnancies are available for deferasirox. Studies in animals have shown some reproductive toxicity at maternally toxic doses (see section 5.3). The potential risk for humans is unknown. As a precaution, it is recommended that EXJADE is not used during pregnancy unless clearly necessary. EXJADE may decrease the efficacy of hormonal contraceptives (see section 4.5). Breast-feeding In animal studies, deferasirox was found to be rapidly and extensively secreted into maternal milk. No effect on the offspring was noted. It is not known if deferasirox is secreted into human milk. Breast-feeding while taking EXJADE is not recommended. Fertility No fertility data is available for humans. In animals, no adverse effects on male or female fertility were found (see section 5.3). 4.7 Effects on ability to drive and use machines No studies on the effects of EXJADE on the ability to drive and use machines have been performed. Patients experiencing the uncommon adverse reaction of dizziness should exercise caution when driving or operating machinery (see section 4.8). 4.8 Undesirable effects Summary of the safety profile The most frequent reactions reported during chronic treatment with EXJADE in adult and paediatric patients include gastrointestinal disturbances in about 26% of patients (mainly nausea, vomiting, diarrhoea or abdominal pain) and skin rash in about 7% of patients. Diarrhoea is reported more commonly in paediatric patients aged 2 to 5 years and in the elderly. These reactions are dose-dependent, mostly mild to moderate, generally transient and mostly resolve even if treatment is continued. During clinical trials, increases in serum creatinine of >33% on two or more consecutive occasions, sometimes above the upper limit of the normal range, occurred in about 36% of patients. These were dose-dependent. About two-thirds of the patients showing serum creatinine increase returned below the 33% level without dose adjustment. In the remaining third the serum creatinine increase did not always respond to a dose reduction or a dose interruption. Indeed, in some cases, only a stabilisation of the serum creatinine values has been observed after dose reduction (see section 4.4). In a retrospective meta-analysis of 2,102 adult and paediatric beta-thalassaemia patients with transfusional iron overload (including patients with different characteristics such as transfusion intensity, posology and treatment duration) treated in two randomised clinical trials and four open label studies of up to five years' duration, a mean creatinine clearance decrease of 13.2% in adult patients (95% CI: -14.4% to -12.1%; n=935) and 9.9% (95% CI: -11.1% to -8.6%; n=1,142) in paediatric patients was observed during the first year of treatment. In a subset of patients followed for more than one year (n=250 up to five years), no further decrease in mean creatinine clearance levels was observed in subsequent years. In a 1-year, randomised, double-blind, placebo-controlled study in patients with non-transfusion-dependent thalassaemia syndromes and iron overload, diarrhoea (9.1%), rash (9.1%), and nausea (7.3%) were the most frequent study drug-related adverse events reported by patients receiving 10 mg/kg/day of EXJADE. Abnormal serum creatinine and creatinine clearance values were reported in 5.5% and 1.8%, respectively, of patients receiving 10 mg/kg/day of EXJADE. Elevations of liver transaminases greater than 2 times the baseline and 5 times the upper limit of normal were reported in 1.8% of patients treated with 10 mg/kg/day of EXJADE. Tabulated list of adverse reactions Adverse reactions are ranked below 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). Within each frequency grouping, adverse reactions are presented in order of decreasing seriousness. Table 1
Gallstones and related biliary disorders were reported in about 2% of patients. Elevations of liver transaminases were reported as an adverse reaction in 2% of patients. Elevations of transaminases greater than 10 times the upper limit of the normal range, suggestive of hepatitis, were uncommon (0.3%). During post-marketing experience, hepatic failure, sometimes fatal, has been reported with EXJADE, especially in patients with pre-existing liver cirrhosis (see section 4.4). There have been post-marketing reports of metabolic acidosis. The majority of these patients had renal impairment, renal tubulopathy (Fanconi's syndrome) or diarrhoea, or conditions where acid-base imbalance is a known complication (see section 4.4). Serious acute pancreatitis may potentially occur as a complication of gallstones (and related biliary disorders). As with other iron chelator treatment, high-frequency hearing loss and lenticular opacities (early cataracts) have been uncommonly observed in patients treated with EXJADE (see section 4.4). Paediatric population Diarrhoea is reported more commonly in paediatric patients aged 2 to 5 years than in older patients. Renal tubulopathy has been mainly reported in children and adolescents with beta-thalassaemia treated with EXJADE. 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. 4.9 Overdose Cases of overdose (2-3 times the prescribed dose for several weeks) have been reported. In one case, this resulted in subclinical hepatitis which resolved after a dose interruption. Single doses of 80 mg/kg in iron-overloaded thalassaemic patients caused mild nausea and diarrhoea. Acute signs of overdose may include nausea, vomiting, headache and diarrhoea. Overdose may be treated by induction of emesis or by gastric lavage, and by symptomatic treatment. 5. Pharmacological properties 5.1 Pharmacodynamic properties Pharmacotherapeutic group: Iron chelating agent, ATC code: V03AC03 Mechanism of action Deferasirox is an orally active chelator that is highly selective for iron (III). It is a tridentate ligand that binds iron with high affinity in a 2:1 ratio. Deferasirox promotes excretion of iron, primarily in the faeces. Deferasirox has low affinity for zinc and copper, and does not cause constant low serum levels of these metals. Pharmacodynamic effects In an iron-balance metabolic study in iron-overloaded adult thalassaemic patients, EXJADE at daily doses of 10, 20 and 40 mg/kg induced the mean net excretion of 0.119, 0.329 and 0.445 mg Fe/kg body weight/day, respectively. Clinical efficacy and safety EXJADE has been investigated in 411 adult (age ≥16 years) and 292 paediatric patients (aged 2 to <16 years) with chronic iron overload due to blood transfusions. Of the paediatric patients 52 were aged 2 to 5 years. The underlying conditions requiring transfusion included beta-thalassaemia, sickle cell disease and other congenital and acquired anaemias (myelodysplastic syndromes, Diamond-Blackfan syndrome, aplastic anaemia and other very rare anaemias). Daily treatment at doses of 20 and 30 mg/kg for one year in frequently transfused adult and paediatric patients with beta-thalassaemia led to reductions in indicators of total body iron; liver iron concentration was reduced by about -0.4 and -8.9 mg Fe/g liver (biopsy dry weight (dw)) on average, respectively, and serum ferritin was reduced by about -36 and -926 µg/l on average, respectively. At these same doses the ratios of iron excretion : iron intake were 1.02 (indicating net iron balance) and 1.67 (indicating net iron removal), respectively. EXJADE induced similar responses in iron-overloaded patients with other anaemias. Daily doses of 10 mg/kg for one year could maintain liver iron and serum ferritin levels and induce net iron balance in patients receiving infrequent transfusions or exchange transfusions. Serum ferritin assessed by monthly monitoring reflected changes in liver iron concentration indicating that trends in serum ferritin can be used to monitor response to therapy. Limited clinical data (29 patients with normal cardiac function at baseline) using MRI indicate that treatment with EXJADE 10-30 mg/kg/day for 1 year may also reduce levels of iron in the heart (on average, MRI T2* increased from 18.3 to 23.0 milliseconds). The principal analysis of the pivotal comparative study in 586 patients suffering from beta-thalassaemia and transfusional iron overload did not demonstrate non-inferiority of EXJADE to deferoxamine in the analysis of the total patient population. It appeared from a post-hoc analysis of this study that, in the subgroup of patients with liver iron concentration ≥7 mg Fe/g dw treated with EXJADE (20 and 30 mg/kg) or deferoxamine (35 to ≥50 mg/kg), the non-inferiority criteria were achieved. However, in patients with liver iron concentration <7 mg Fe/g dw treated with EXJADE (5 and 10 mg/kg) or deferoxamine (20 to 35 mg/kg), non-inferiority was not established due to imbalance in the dosing of the two chelators. This imbalance occurred because patients on deferoxamine were allowed to remain on their pre-study dose even if it was higher than the protocol specified dose. Fifty-six patients under the age of 6 years participated in this pivotal study, 28 of them receiving EXJADE. It appeared from preclinical and clinical studies that EXJADE could be as active as deferoxamine when used in a dose ratio of 2:1 (i.e. a dose of EXJADE that is numerically half of the deferoxamine dose). However, this dosing recommendation was not prospectively assessed in the clinical trials. In addition, in patients with liver iron concentration ≥7 mg Fe/g dw with various rare anaemias or sickle cell disease, EXJADE up to 20 and 30 mg/kg produced a decrease in liver iron concentration and serum ferritin comparable to that obtained in patients with beta-thalassaemia. In patients with non-transfusion-dependent thalassaemia syndromes and iron overload, treatment with EXJADE was assessed in a 1-year, randomised, double-blind, placebo-controlled study. The study compared the efficacy of two different deferasirox regimens (starting doses of 5 and 10 mg/kg/day, 55 patients in each arm) and of matching placebo (56 patients). The study enrolled 145 adult and 21 paediatric patients. The primary efficacy parameter was the change in liver iron concentration (LIC) from baseline after 12 months of treatment. One of the secondary efficacy parameters was the change in serum ferritin between baseline and fourth quarter. At a starting dose of 10 mg/kg/day, EXJADE led to reductions in indicators of total body iron. On average, liver iron concentration decreased by 3.80 mg Fe/g dw in patients treated with EXJADE (starting dose 10 mg/kg/day) and increased by 0.38 mg Fe/g dw in patients treated with placebo (p<0.001). On average, serum ferritin decreased by 222.0 µg/l in patients treated with EXJADE (starting dose 10 mg/kg/day) and increased by 115 µg/l in patients treated with placebo (p<0.001). The European Medicines Agency has deferred the obligation to submit the results of studies with EXJADE in one or more subsets of the paediatric population in the treatment of chronic iron overload requiring chelation therapy (see section 4.2 for information on paediatric use). 5.2 Pharmacokinetic properties Absorption Deferasirox is absorbed following oral administration with a median time to maximum plasma concentration (tmax) of about 1.5 to 4 hours. The absolute bioavailability (AUC) of deferasirox from EXJADE tablets is about 70% compared to an intravenous dose. Total exposure (AUC) was approximately doubled when taken along with a high-fat breakfast (fat content >50% of calories) and by about 50% when taken along with a standard breakfast. The bioavailability (AUC) of deferasirox was moderately (approx. 13–25%) elevated when taken 30 minutes before meals with normal or high fat content. Distribution Deferasirox is highly (99%) protein bound to plasma proteins, almost exclusively serum albumin, and has a small volume of distribution of approximately 14 litres in adults. Biotransformation Glucuronidation is the main metabolic pathway for deferasirox, with subsequent biliary excretion. Deconjugation of glucuronidates in the intestine and subsequent reabsorption (enterohepatic recycling) is likely to occur: in a healthy volunteer study, the administration of cholestyramine after a single dose of deferasirox resulted in a 45% decrease in deferasirox exposure (AUC). Deferasirox is mainly glucuronidated by UGT1A1 and to a lesser extent UGT1A3. CYP450-catalysed (oxidative) metabolism of deferasirox appears to be minor in humans (about 8%). No inhibition of deferasirox metabolism by hydroxyurea was observed in vitro. Elimination Deferasirox and its metabolites are primarily excreted in the faeces (84% of the dose). Renal excretion of deferasirox and its metabolites is minimal (8% of the dose). The mean elimination half-life (t1/2) ranged from 8 to 16 hours. The transporters MRP2 and MXR (BCRP) are involved in the biliary excretion of deferasirox. Linearity/non-linearity The Cmax and AUC0-24h of deferasirox increase approximately linearly with dose under steady-state conditions. Upon multiple dosing exposure increased by an accumulation factor of 1.3 to 2.3. Characteristics in patients Paediatric patients The overall exposure of adolescents (12 to ≤17 years) and children (2 to <12 years) to deferasirox after single and multiple doses was lower than that in adult patients. In children younger than 6 years old exposure was about 50% lower than in adults. Since dosing is individually adjusted according to response this is not expected to have clinical consequences. Gender Females have a moderately lower apparent clearance (by 17.5%) for deferasirox compared to males. Since dosing is individually adjusted according to response this is not expected to have clinical consequences. Elderly patients The pharmacokinetics of deferasirox have not been studied in elderly patients (aged 65 or older). Renal or hepatic impairment The pharmacokinetics of deferasirox have not been studied in patients with renal impairment. The pharmacokinetics of deferasirox were not influenced by liver transaminase levels up to 5 times the upper limit of the normal range. In a clinical study using single doses of 20 mg/kg deferasirox, the average exposure was increased by 16% in subjects with mild hepatic impairment (Child-Pugh Class A) and by 76% in subjects with moderate hepatic impairment (Child-Pugh Class B) compared to subjects with normal hepatic function. The average Cmax of deferasirox in subjects with mild or moderate hepatic impairment was increased by 22%. Exposure was increased 2.8-fold in one subject with severe hepatic impairment (Child-Pugh Class C) (see sections 4.2 and 4.4). 5.3 Preclinical safety data Preclinical data reveal no special hazard for patients with iron overload, based on conventional studies of safety pharmacology, repeated dose toxicity, genotoxicity or carcinogenic potential. The main findings were kidney toxicity and lens opacity (cataracts). Similar findings were observed in neonatal and juvenile animals. The kidney toxicity is considered mainly due to iron deprivation in animals that were not previously overloaded with iron. Tests of genotoxicity in vitro were either negative (Ames test, chromosomal aberration test) or positive (V79 screen). Deferasirox caused formation of micronuclei in vivo in the bone marrow, but not liver, of non-iron-loaded rats at lethal doses. No such effects were observed in iron-preloaded rats. Deferasirox was not carcinogenic when administered to rats in a 2-year study and transgenic p53+/- heterozygous mice in a 6-month study. The potential for toxicity to reproduction was assessed in rats and rabbits. Deferasirox was not teratogenic, but caused increased frequency of skeletal variations and stillborn pups in rats at high doses that were severely toxic to the non-iron-overloaded mother. Deferasirox did not cause other effects on fertility or reproduction. 6. Pharmaceutical particulars 6.1 List of excipients Lactose monohydrate Crospovidone type A Cellulose, microcrystalline Povidone Sodium laurilsulfate Silica, colloidal anhydrous Magnesium stearate 6.2 Incompatibilities Dispersion in carbonated drinks or milk is not recommended due to foaming and slow dispersion, respectively. 6.3 Shelf life 3 years 6.4 Special precautions for storage Store in the original package in order to protect from moisture. 6.5 Nature and contents of container PVC/PE/PVDC/Aluminium blisters. Packs containing 28, 84 or 252 dispersible tablets. Not all pack sizes may be marketed. 6.6 Special precautions for disposal and other handling No special requirements. 7. Marketing authorisation holder Novartis Europharm Limited Frimley Business Park Camberley GU16 7SR United Kingdom 8. Marketing authorisation number(s) Exjade 125mg dispersible tablets: EU/1/06/356/001 EU/1/06/356/002 EU/1/06/356/007 Exjade 250mg dispersible tablets: EU/1/06/356/003 EU/1/06/356/004 EU/1/06/356/008 Exjade 500mg dispersible tablets: EU/1/06/356/005 EU/1/06/356/006 EU/1/06/356/009 9. Date of first authorisation/renewal of the authorisation Date of first authorisation: 28.08.2006 Date of latest renewal: 28.08.2011 10. Date of revision of the text 06.11.2014 Detailed information on this product is available on the website of the European Medicines Agency http://www.ema.europa.eu |
Exjade(Deferasirox dispersible Tablets)简介:
英文药名:Exjade(Deferasirox dispersible Tablets)
中文药名:地拉罗斯片(去铁斯若)
生产厂家:德国诺华公司 药品介绍2012年12月24日,地拉罗司Exjade(deferasirox,商品名:恩瑞格)获欧盟委员 ... 责任编辑:admin |
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