Verlängerung der QT-Zeit
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Eklärungen für Patienten zu den Wirkstoffen
Für die Kombination von Nilotinib und Cimetidin liegen uns keine zusätzlichen Warnhinweise vor. Bitte konsultieren Sie zusätzlich die jeweiligen Fachinformationen.
Die genannten Expositionsveränderungen beziehen sich jeweils auf Veränderungen der Plasmakonzentrations-Zeit-Kurve [ AUC ]. Die Exposition von Nilotinib erhöht sich auf 103%, wenn eine Kombination mit Cimetidin (103%) erfolgt. Eine Veränderung der Exposition von Cimetidin haben wir nicht erkannt. Den Einfluss von Nilotinib können wir aktuell nicht abschätzen.
Für die Berechnung der individuellen Expositionsveränderungen durch die Wechselwirkungen werden als Ausgangsbasis die pharmakokinetischen Parameter der durchschnittlichen Population verwendet.
Nilotinib hat eine tiefe orale Bioverfügbarkeit [ F ] von 30%, weshalb die maximalen Plasmaspiegel [ Cmax ] sich bei einer Interaktion tendentiell stark verändern. Die terminale Halbwertszeit [ t12 ] beträgt 16 Stunden und konstante Plasmaspiegel [ Css ] werden ungefähr nach 64 Stunden erreicht. Die Proteinbindung [ Pb ] ist mit 98% stark. Die Metabolisierung findet vor allem über CYP3A4 statt und der aktive Transport erfolgt insbesondere über PGP. Unter anderem ist Nilotinib ein Hemmer von BCRP und PGP.
Cimetidin hat eine mittlere orale Bioverfügbarkeit [ F ] von 65%, weshalb die maximalen Plasmaspiegel [ Cmax ] sich bei einer Interaktion tendentiell verändern. Die terminale Halbwertszeit [ t12 ] ist mit 1.6333333 Stunden eher kurz und konstante Plasmaspiegel [ Css ] werden schnell erreicht. Die Proteinbindung [ Pb ] ist mit 19% sehr schwach und das Verteilungsvolumen [ Vd ] ist mit 91 Liter sehr gross. Die Metabolisierung erfolgt nicht über die gängigen Cytochrome und der aktive Transport erfolgt zum Teil über BCRP und PGP. Unter anderem ist Cimetidin ein Hemmer von CYP3A4.
|Serotonerge Effekte a||0||Ø||Ø|
Bewertung: Gemäss unseren Erkenntnissen erhöhen weder Nilotinib noch Cimetidin die serotonerge Aktivität.
|Kiesel & Durán b||1||Ø||+|
Empfehlung: Insbesondere nach einer Dosiserhöhung und bei Dosierungen im oberen therapeutischen Bereich sollte vorsichtshalber auf anticholinerge Symptome geachtet werden.
Bewertung: Cimetidin beeinflusst das anticholinerge System nur mild. Das Risiko für ein anticholinerge Syndrom ist bei dieser Medikation eher als gering einzustufen, wenn die Dosierung sich im üblichen Bereich befindet. Gemäss unseren Erkenntnisse erhöht Nilotinib nicht die anticholinerge Aktivität.
Verlängerung der QT-Zeit
Bewertung: In Kombination können Nilotinib und Cimetidin potentiell ventrikuläre Arrhythmien vom Typ Torsades de pointes auslösen.
|Erhöhte Lipase||28.0 %||28.0||n.a.|
Verstopfung (23%): Nilotinib
Erbrechen (22%): Nilotinib
Bauchschmerzen (15.5%): Nilotinib
Magen-Darm-Blutung (4%): Nilotinib
Husten (22%): Nilotinib
Nasopharyngitis (21%): Nilotinib
Lungenentzündung (9.9%): Nilotinib
Arthralgie (21%): Nilotinib
Myalgie (17.5%): Nilotinib
Muskelschwäche (5.5%): Nilotinib
Nachtschweiss (19.5%): Nilotinib
Alopezie (12%): Nilotinib
Anämie (15.5%): Nilotinib
Leukopenie (5.5%): Nilotinib
Neutropenie (5.5%): Nilotinib
Blutung (1.4%): Nilotinib
Hypophosphatämie (12.5%): Nilotinib
Hypokaliämie (9%): Nilotinib
Hyponatriämie (4%): Nilotinib
Periphere Ödeme (12%): Nilotinib
Asthenie (11.5%): Nilotinib
Intrakranielle Blutung (5.5%): Nilotinib
Transitorische ischämische Attacke: Nilotinib
Hyperglykämie (9%): Nilotinib
Hypertriglyceridämie (5.5%): Nilotinib
Gynäkomastie (4%): Cimetidin
Hyperbilirubinämie (6.5%): Nilotinib
Erhöhte ALT (4%): Nilotinib
Erhöhte AST (2%): Nilotinib
Erhöhte alkalische Phosphatase: Nilotinib
Basierend auf Ihren
Abstract: Recently, the use of astemizole and terfenadine, both non-sedating H1-antihistamines, caused considerable concern. Several case reports suggested an association of both drugs with an increased risk of torsades de pointes, a special form of ventricular tachycardia. The increased risk of both H1-antihistamines was associated with exposure to supratherapeutic doses; for terfenadine the risk was also associated with concomitant exposure to the cytochrome P-450 inhibitors ketoconazole, erythromycin and cimetidine. To predict the size of the population that runs the risk of developing this potentially fatal adverse reaction in the Netherlands, the prevalence of prescribing supratherapeutic doses and the concomitant exposure to terfenadine and cytochrome P-450 inhibitors was studied. Data were obtained from the PHARMO data base in 1990, a pharmacy-based record linkage system encompassing a catchment population of 300,000 individuals. The results of the study showed that the prescribing of supratherapeutic doses and the concomitant exposure to terfenadine and cytochrome P-450 inhibitors was low. Furthermore, the results of a sensitivity analysis showed that the risk of fatal torsades de pointes has to be as high as 1 in 10,000 to cause one death in the Netherlands in one year.
Abstract: Astemizole (Hismanal), an antihistamine agent, has been reported to be associated with ventricular arrhythmias. In this paper we present a case of QT prolongation and torsades de pointes (TdP) in a 77-year-old woman who had been taking astemizole (10 mg/day) for 6 months because of allergic skin disease. At the time of admission, the serum concentration of astemizole and its metabolites was markedly elevated at 15.85 ng/ml, approximately 3 times the normal level. The patient was also taking cimetidine, a known inhibitor of cytochrome P-450 enzymatic activity, and during her admission was diagnosed as having vasospastic angina. To the best of our knowledge, this is the first report of astemizole-induced QT prolongation and TdP in Japan.
Abstract: Renal drug interactions can result from competitive inhibition between drugs that undergo extensive renal tubular secretion by transporters such as P-glycoprotein (P-gp). The purpose of this study was to evaluate the effect of itraconazole, a known P-gp inhibitor, on the renal tubular secretion of cimetidine in healthy volunteers who received intravenous cimetidine alone and following 3 days of oral itraconazole (400 mg/day) administration. Glomerular filtration rate (GFR) was measured continuously during each study visit using iothalamate clearance. Iothalamate, cimetidine, and itraconazole concentrations in plasma and urine were determined using high-performance liquid chromatography/ultraviolet (HPLC/UV) methods. Renal tubular secretion (CL(sec)) of cimetidine was calculated as the difference between renal clearance (CL(r)) and GFR (CL(ioth)) on days 1 and 5. Cimetidine pharmacokinetic estimates were obtained for total clearance (CL(T)), volume of distribution (Vd), elimination rate constant (K(el)), area under the plasma concentration-time curve (AUC(0-240 min)), and average plasma concentration (Cp(ave)) before and after itraconazole administration. Plasma itraconazole concentrations following oral dosing ranged from 0.41 to 0.92 microg/mL. The cimetidine AUC(0-240 min) increased by 25% (p < 0.01) following itraconazole administration. The GFR and Vd remained unchanged, but significant reductions in CL(T) (655 vs. 486 mL/min, p < 0.001) and CL(sec) (410 vs. 311 mL/min, p = 0.001) were observed. The increased systemic exposure of cimetidine during coadministration with itraconazole was likely due to inhibition of P-gp-mediated renal tubular secretion. Further evaluation of renal P-gp-modulating drugs such as itraconazole that may alter the renal excretion of coadministered drugs is warranted.
Abstract: Anticholinergic Drug Scale (ADS) scores were previously associated with serum anticholinergic activity (SAA) in a pilot study. To replicate these results, the association between ADS scores and SAA was determined using simple linear regression in subjects from a study of delirium in 201 long-term care facility residents who were not included in the pilot study. Simple and multiple linear regression models were then used to determine whether the ADS could be modified to more effectively predict SAA in all 297 subjects. In the replication analysis, ADS scores were significantly associated with SAA (R2 = .0947, P < .0001). In the modification analysis, each model significantly predicted SAA, including ADS scores (R2 = .0741, P < .0001). The modifications examined did not appear useful in optimizing the ADS. This study replicated findings on the association of the ADS with SAA. Future work will determine whether the ADS is clinically useful for preventing anticholinergic adverse effects.
Abstract: BACKGROUND: Adverse effects of anticholinergic medications may contribute to events such as falls, delirium, and cognitive impairment in older patients. To further assess this risk, we developed the Anticholinergic Risk Scale (ARS), a ranked categorical list of commonly prescribed medications with anticholinergic potential. The objective of this study was to determine if the ARS score could be used to predict the risk of anticholinergic adverse effects in a geriatric evaluation and management (GEM) cohort and in a primary care cohort. METHODS: Medical records of 132 GEM patients were reviewed retrospectively for medications included on the ARS and their resultant possible anticholinergic adverse effects. Prospectively, we enrolled 117 patients, 65 years or older, in primary care clinics; performed medication reconciliation; and asked about anticholinergic adverse effects. The relationship between the ARS score and the risk of anticholinergic adverse effects was assessed using Poisson regression analysis. RESULTS: Higher ARS scores were associated with increased risk of anticholinergic adverse effects in the GEM cohort (crude relative risk [RR], 1.5; 95% confidence interval [CI], 1.3-1.8) and in the primary care cohort (crude RR, 1.9; 95% CI, 1.5-2.4). After adjustment for age and the number of medications, higher ARS scores increased the risk of anticholinergic adverse effects in the GEM cohort (adjusted RR, 1.3; 95% CI, 1.1-1.6; c statistic, 0.74) and in the primary care cohort (adjusted RR, 1.9; 95% CI, 1.5-2.5; c statistic, 0.77). CONCLUSION: Higher ARS scores are associated with statistically significantly increased risk of anticholinergic adverse effects in older patients.
Abstract: The development of tyrosine kinase inhibitors (TKI) represents a major milestone in oncology. However, their use has been found to be associated with serious toxicities that impinge on various vital organs including the heart. Sixteen TKIs have been approved for use in oncology as of 30 September 2012, and a large number of others are in development or under regulatory review. Cardiovascular safety of medicinal products is a major public health issue that has concerned all the stakeholders. This review focuses on three specific cardiovascular safety aspects of TKIs, namely their propensity to induce QT interval prolongation, left ventricular (LV) dysfunction and hypertension (both systemic and pulmonary). Analyses of information in drug labels, the data submitted to the regulatory authorities and the published literature show that a number of TKIs are associated with these undesirable effects. Whereas LV dysfunction and systemic hypertension are on-target effects related to the inhibition of ligand-related signalling pathways, QT interval prolongation appears to be an off-target class III electrophysiologic effect, possibly related to the presence of a fluorine-based pharmacophore. If not adequately managed, these cardiovascular effects significantly increase the morbidity and mortality in a population already at high risk. Hitherto, the QT effect of most QT-prolonging TKIs (except lapatinib, nilotinib, sunitinib and vandetanib) is relatively mild at clinical doses and has not led to appreciable morbidity clinically. In contrast, LV dysfunction and untreated hypertension have resulted in significant morbidity. Inevitably, dilemmas arise in determining the risk/benefit of a TKI therapy in an individual patient who develops any of these effects following the treatment of the TKI-sensitive cancer. QT interval prolongation, hypertension and LV dysfunction can be managed effectively by using reliable methods of measurement and careful monitoring of patients whose clinical management requires optimisation by a close collaboration between an oncologist and a cardiologist, an evolving subspecialty referred to as cardio-oncology. Despite their potential adverse clinical impact, the effects of TKIs on hypertension and LV function are generally inadequately characterised during their development. As has been the case with QT liability of drugs, there is now a persuasive case for a regulatory requirement to study TKIs systematically for these effects. Furthermore, since most of these novel drugs are studied in trials with relatively small sample sizes and approved on an expedited basis, there is also a compelling case for their effective pharmacovigilance and on-going reassessment of their risk/benefit after approval.
Abstract: Crizotinib (Xalkori®) and nilotinib (Tasigna®) are tyrosine kinase inhibitors approved for the treatment of non-small cell lung cancer and chronic myeloid leukemia, respectively. Both have been shown to result in electrocardiogram rate-corrected Q-wave T-wave interval (QTc) prolongation in humans and animals. Liposomes have been shown to ameliorate drug-induced effects on the cardiac-delayed rectifier K(+) current (IKr, KV11.1), coded by the human ether-a-go-go-related gene (hERG). This study was undertaken to determine if liposomes would also decrease the effect of crizotinib and nilotinib on the IKr channel. Crizotinib and nilotinib were tested in an in vitro IKr assay using human embryonic kidney (HEK) 293 cells stably transfected with the hERG. Dose-responses were determined and the 50% inhibitory concentrations (IC50s) were calculated. When the HEK 293 cells were treated with crizotinib or nilotinib that were mixed with liposomes, there was a significant decrease in the IKr channel inhibitory effects of these two drugs. When isolated, rabbit hearts were exposed to crizotinib or nilotinib, there were significant increases in QTc prolongation. Mixing either of the drugs with liposomes ameliorated the effects of the drugs. Rabbits dosed intravenously (IV) with crizotinib or nilotinib showed QTc prolongation. When liposomes were injected prior to crizotinib or nilotinib, the liposomes decreased the effects on the QTc interval. The use of liposomal encapsulated QT-prolongation agents, or giving liposomes in combination with drugs, may decrease their cardiac liability.
Abstract: Transporters in proximal renal tubules contribute to the disposition of numerous drugs. Furthermore, the molecular mechanisms of tubular secretion have been progressively elucidated during the past decades. Organic anions tend to be secreted by the transport proteins OAT1, OAT3 and OATP4C1 on the basolateral side of tubular cells, and multidrug resistance protein (MRP) 2, MRP4, OATP1A2 and breast cancer resistance protein (BCRP) on the apical side. Organic cations are secreted by organic cation transporter (OCT) 2 on the basolateral side, and multidrug and toxic compound extrusion (MATE) proteins MATE1, MATE2/2-K, P-glycoprotein, organic cation and carnitine transporter (OCTN) 1 and OCTN2 on the apical side. Significant drug-drug interactions (DDIs) may affect any of these transporters, altering the clearance and, consequently, the efficacy and/or toxicity of substrate drugs. Interactions at the level of basolateral transporters typically decrease the clearance of the victim drug, causing higher systemic exposure. Interactions at the apical level can also lower drug clearance, but may be associated with higher renal toxicity, due to intracellular accumulation. Whereas the importance of glomerular filtration in drug disposition is largely appreciated among clinicians, DDIs involving renal transporters are less well recognized. This review summarizes current knowledge on the roles, quantitative importance and clinical relevance of these transporters in drug therapy. It proposes an approach based on substrate-inhibitor associations for predicting potential tubular-based DDIs and preventing their adverse consequences. We provide a comprehensive list of known drug interactions with renally-expressed transporters. While many of these interactions have limited clinical consequences, some involving high-risk drugs (e.g. methotrexate) definitely deserve the attention of prescribers.