Akynzeo

Akynzeo

netupitant + palonosetron

Manufacturer:

Helsinn

Distributor:

Mundipharma
Full Prescribing Info
Contents
Netupitant, palonosetron.
Description
Each capsule contains: Netupitant 300 mg, Palonosetron (as HCl) 500 mcg, Yellow iron oxide (E172), NF 783 mcg, Red iron oxide (E172), NF 523 mcg, Titanium dioxide, USP/EP, 180 mcg, Butylated hydroxyanisole, NF/EP 70 mcg.
List of excipients: Hard capsule content: Netupitant tablets: Microcrystalline cellulose (E460), Sucrose lauric acid esters, Povidone K-30, Croscarmellose sodium, Colloidal hydrated silica, Sodium stearyl fumarate, Magnesium stearate.
Palonosetron soft capsule: Capsule content: Glycerol monocaprylocaproate (type I), Glycerol, Polyglyceryl oleate, Purified water, Butylhydroxyanisole (E320).
Capsule shell: Gelatin, Glycerol, Sorbitol, 1,4 sorbitan, Titanium dioxide (E171).
Hard capsule shell: Gelatin, Titanium dioxide (E171), Yellow iron oxide (E172), Red iron oxide (E172).
Printing ink: Shellac glaze (partially esterified), Black iron oxide (E172), Propylene glycol (E1520).
Action
Pharmacotherapeutic Group: Antiemetics and antinauseants, serotonin (5-HT3) antagonists. ATC Code: A04AA55.
Pharmacology: Pharmacodynamics: Mechanism of action: Netupitant is a selective antagonist of human substance P/neurokinin 1 (NK1) receptors.
Palonosetron is a 5-HT3 receptor antagonist with a strong binding affinity for this receptor and little or no affinity for other receptors. Chemotherapeutic substances produce nausea and vomiting by stimulating the release of serotonin from the enterochromaffin cells of the small intestine. Serotonin then activates 5-HT3 receptors located on vagal afferents to initiate the vomiting reflex.
Delayed emesis has been associated with the activation of tachykinin family neurokinin 1 (NK1) receptors (broadly distributed in the central and peripheral nervous systems) by substance P. As shown in in vitro and in vivo studies, netupitant inhibits substance P mediated responses.
Netupitant was shown to cross the blood brain barrier with a NK1 receptor occupancy of 92.5%, 86.5%, 85.0%, 78.0%, and 76.0% in striatum at 6, 24, 48, 72, and 96 hours, respectively, after administration of 300 mg netupitant.
Clinical efficacy and safety: Oral administration of NETUPITANT/PALONOSETRON (AKYNZEO) in combination with dexamethasone has been shown to prevent acute and delayed nausea and vomiting associated with highly and moderately emetogenic cancer chemotherapy in two separate pivotal studies.
Highly Emetogenic Chemotherapy (HEC) study: In a multicenter, randomized, parallel, double-blind, controlled clinical study of 694 patients, the efficacy and safety of single doses of oral netupitant in combination with oral palonosetron was compared with a single oral dose of palonosetron in cancer patients receiving a chemotherapy regimen that included cisplatin (median dose = 75 mg/m2). The efficacy of NETUPITANT/PALONOSETRON (AKYNZEO) was assessed in 135 patients who received a single oral dose (netupitant 300 mg and palonosetron 500 mcg) and 136 patients who received oral palonosetron 500 mcg alone.
Treatment regimens for the NETUPITANT/PALONOSETRON (AKYNZEO) and the palonosetron 500 mcg arms are displayed in Table as follows. (See Table 1.)

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The primary efficacy endpoint was complete response (CR) rate (defined as no emetic episodes, no rescue medication) within 120 hours (overall phase) after the start of the highly emetogenic chemotherapy administration.
A summary of the key results from this study is shown in Table as follows. (See Table 2.)

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Moderately Emetogenic Chemotherapy (MEC) study: In a multicenter, randomized, parallel, double-blind, active-controlled, superiority study, the efficacy and safety of a single oral dose of NETUPITANT/PALONOSETRON (AKYNZEO) was compared with a single oral dose of palonosetron 500 mcg in cancer patients scheduled to receive the first cycle of an anthracycline and cyclophosphamide regimen for the treatment of a solid malignant tumor. At the time of the study, anthracycline-cyclophosphamide containing chemotherapy regimens were considered to be moderately emetogenic. Recent guidance has updated these regimens to highly emetogenic.
All patients received a single oral dose of dexamethasone. (See Table 3.)

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After completion of cycle 1, patients had the option to participate in a multiple-cycle extension, receiving the same treatment as assigned in cycle 1. There was no pre-specified limit of the number of repeat consecutive cycles for any patient. A total of 1450 patients (NETUPITANT/PALONOSETRON (AKYNZEO) n=725; Palonosetron n=725) received study medication. Of these, 1438 patients (98.8%) completed cycle 1 and 1286 patients (88.4%) continued treatment in the multiple-cycle extension. A total of 907 patients (62.3%) completed the multiple-cycle extension up to a maximum of eight treatment cycles. A total of 724 patients (99.9%) were treated with cyclophosphamide. All patients were additionally treated with either doxorubicin (68.0%) or epirubicin (32.0%).
The primary efficacy endpoint was the CR rate in the delayed phase, 25-120 hours after the start of the chemotherapy administration.
A summary of the key results from this study is shown in Table as follows. (See Table 4.)

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Patients continued into the Multiple-Cycle extension for up to 7 additional cycles of chemotherapy. Antiemetic activity of NETUPITANT/PALONOSETRON (AKYNZEO) was maintained throughout repeat cycles for those patients continuing in each of the multiple cycles.
The impact of nausea and vomiting on patients' daily lives was assessed using the Functional Living Index–Emesis (FLIE). The proportion of patients with Overall no impact on daily life was 6.3% higher (p value =0.005) in the NETUPITANT/PALONOSETRON (AKYNZEO) group (78.5%) than in the palonosetron group (72.1%).
Multiple-cycle safety study in patients receiving either Highly Emetogenic Chemotherapy or Moderately Emetogenic Chemotherapy: In a separate study, a total of 413 patients undergoing initial and repeat cycles of chemotherapy (including carboplatin, cisplatin, oxaliplatin, and doxorubicin regimens), were randomized to receive either NETUPITANT/PALONOSETRON (AKYNZEO) (n=309) or aprepitant and palonosetron (n=104). Safety and efficacy were maintained throughout all cycles.
Pharmacokinetics:
Absorption: Netupitant: Absolute netupitant bioavailability data are not available in humans; based on data from two studies with intravenous netupitant, the bioavailability in humans is estimated to be greater than 60%.
In single dose oral studies, netupitant was measurable in plasma between 15 minutes and 3 hours after dosing. Plasma concentrations followed a first order absorption process and reached Cmax in approximately 5 hours. There was a supra-proportional increase in Cmax and AUC parameters for doses from 10 mg to 300 mg.
In 82 healthy subjects given a single oral dose of netupitant 300 mg, maximum plasma netupitant concentration (Cmax) was 486 ± 268 ng/mL (mean ± SD) and median time to maximum concentration (Tmax) was 5.25 hours, the AUC was 15032 ± 6858 h.ng/mL. In a pooled analysis, females had a higher netupitant exposure compared to males; there was a 1.31-fold increase in Cmax, a 1.02 fold increase for AUC and a 1.36 fold increase in half-life.
Netupitant AUC0-∞ and Cmax increased by 1.1 fold and 1.2 fold, respectively, after a high fat meal.
Palonosetron: Following oral administration, palonosetron is well absorbed with its absolute bioavailability reaching 97%. After single oral doses using buffered solution mean maximum palonosetron concentrations (Cmax) and area under the concentration-time curve (AUC0-∞) were dose proportional over the dose range of 3.0 to 80 mcg/kg in healthy subjects.
In 36 healthy male and female subjects given a single oral dose of 500 mcg palonosetron, maximum plasma concentration (Cmax) was 0.81 ± 1.66 ng/mL (mean ± SD) and time to maximum concentration (Tmax) was 5.1 ± 1.7 hours. In female subjects (n=18), the mean AUC was 35% higher and the mean Cmax was 26% higher than in male subjects (n=18). In 12 cancer patients given a single oral dose of palonosetron 500 mcg one hour prior to chemotherapy, Cmax was 0.93 ± 0.34 ng/mL and Tmax was 5.1 ± 5.9 hours. The AUC was 30% higher in cancer patients than in healthy subjects. A high fat meal did not affect the Cmax and AUC of oral palonosetron.
Distribution: Netupitant: After a single oral 300 mg dose administration in cancer patients, netupitant disposition was characterised by a two compartment model with an estimated median systemic clearance of 20.5 L/h and a large distribution volume in the central compartment (486 L). Human plasma protein binding of netupitant and its two major metabolites M1 and M3 is > 99% at concentrations ranging from 10 to 1500 ng/mL. The third major metabolite, M2, is > 97% bound to plasma proteins.
Palonosetron: Palonosetron has a volume of distribution of approximately 8.3 ± 2.5 L/kg. Approximately 62% of palonosetron is bound to plasma proteins.
Biotransformation: Netupitant: Three metabolites have been detected in human plasma at netupitant oral doses of 30 mg and higher (the desmethyl derivative, M1; the N-oxide derivative, M2; the OH-methyl derivative, M3). In vitro metabolism studies have suggested that CYP3A4 and, to a lesser extent, CYP2D6 and CYP2C9 are involved in the metabolism of netupitant. After administration of a single oral dose of 300 mg netupitant, mean plasma netupitant/plasma radioactivity ratios ranged from 0.13 to 0.49 over 96 h post-dose. The ratios were time dependent with values decreasing gradually beyond 24 h post-dose, indicating that netupitant is being rapidly metabolized. Mean Cmax was approximately 11%, 47% and 16% of the parent for M1, M2 and M3 respectively; M2 had the lowest AUC relative to the parent (14%) whereas M1 and M3 AUC were approximately 29% and 33% of the parent, respectively. M1, M2 and M3 metabolites were all shown to be pharmacologically active in an animal pharmacodynamic model, where M3 was most potent and M2 least active.
Palonosetron: Palonosetron is eliminated by multiple routes with approximately 50% metabolized to form two primary metabolites: N-oxide-palonosetron and 6-S-hydroxy-palonosetron. These metabolites each have less than 1% of the 5-HT3 receptor antagonist activity of palonosetron. In vitro metabolism studies have suggested that CYP2D6 and to a lesser extent, CYP3A4 and CYP1A2 are involved in the metabolism of palonosetron. However, clinical pharmacokinetic parameters are not significantly different between poor and extensive metabolizers of CYP2D6 substrates.
Elimination: Netupitant: Following administration of a single dose of NETUPITANT/PALONOSETRON (AKYNZEO), netupitant is eliminated from the body in a multi-exponential fashion, with an apparent mean elimination half-life of 88 hours in cancer patients.
Renal clearance is not a significant elimination route for netupitant-related entities. The mean fraction of an oral dose of netupitant excreted unchanged in urine is less than 1%; a total of 3.95% and 70.7% of the radioactive dose was recovered in the urine and feces, respectively.
Approximately half the radioactivity administered orally as [14C]­-netupitant was recovered from urine and feces within 120 h of dosing. Elimination via both routes was estimated to be complete by Day 29-30 post-dose.
Palonosetron: Following administration of a single oral 750 mcg dose of [14C]­-palonosetron to six healthy subjects, 85% to 93% of the total radioactivity was excreted in urine, and 5% to 8% was eliminated in feces. The amount of unchanged palonosetron excreted in the urine represented approximately 40% of the administered dose. In healthy subjects given palonosetron capsules 500 mcg, the terminal elimination half-life (t½) of palonosetron was 37 ± 12 hours (mean ± SD), and in cancer patients, t½ was 48 ± 19 hours. After a single dose of approximately 750 mcg intravenous palonosetron, the total body clearance of palonosetron in healthy subjects was 160 ± 35 mL/h/kg (mean ± SD) and renal clearance was 66.5± 18.2 mL/h/kg.
Special populations: Hepatic Impairment: Netupitant: Maximum concentrations and total exposure of netupitant were increased in subjects with mild (n=8), moderate (n=8), and severe (n=2) hepatic impairment compared to matching healthy subjects, although there was pronounced individual variability in both hepatically-impaired and healthy subjects. Exposure to netupitant (Cmax, AUC0-t and AUC0-∞) compared to matching healthy subjects was 11%, 28% and 19% higher in mild and 70%, 88% and 143% higher in moderate hepatically- impaired subjects, respectively. As such, no dosage adjustment is necessary for patients with mild to moderate hepatic impairment. Limited data exist in patients with severe hepatic impairment (Child Pugh score ≥9).
Palonosetron: Hepatic impairment does not significantly affect total body clearance of palonosetron compared to the healthy subjects. While the terminal elimination half-life and mean systemic exposure of palonosetron is increased in the subjects with severe hepatic impairment, this does not warrant dose reduction.
Renal impairment: Netupitant: No specific studies were performed to evaluate netupitant in patients with renal impairment. In the ADME trial, less than 5% of all netupitant-related material was excreted in urine and less than 1% of the netupitant dose was eliminated unchanged in the urine and therefore any accumulation of netupitant or metabolites after a single dose would be negligible. Furthermore, the population PK study showed no correlation between PK parameters of netupitant and markers of renal dysfunction.
Palonosetron: Mild to moderate renal impairment does not significantly affect palonosetron PK parameters. Total systemic exposure to intravenous palonosetron increased by approximately 28% in patients with severe impairment relative to healthy subjects. In a population PK study, patients with a reduced creatinine clearance (CLCR) also had a reduced palonosetron clearance, but this reduction would not result in a significant change in palonosetron exposure.
Therefore, NETUPITANT/PALONOSETRON (AKYNZEO) can be administered without dosage adjustment in patients with renal impairment.
Neither netupitant nor palonosetron have been evaluated in patients with end-stage renal disease.
Toxicology: Preclinical safety data: Palonosetron: Effects in non-clinical studies were observed only at exposures considered sufficiently in excess of the maximum human exposure, indicating little relevance to clinical use. Non-clinical studies indicate that palonosetron, only at very high concentrations, may block ion channels involved in ventricular de- and re-polarization and prolong action potential duration. Degeneration of seminiferous epithelium was associated with palonosetron following a one month oral repeat dose toxicity study in rats. Animal studies do not indicate direct or indirect harmful effects with respect to pregnancy, embryonal/fetal development, parturition or postnatal development. Only limited data from animal studies are available regarding the placental transfer (see Use in Pregnancy & Lactation). Palonosetron is not mutagenic. High doses of palonosetron (each dose causing at least 15 times the human therapeutic exposure) applied daily for two years caused an increased rate of liver tumors, endocrine neoplasms (in thyroid, pituitary, pancreas, adrenal medulla) and skin tumors in rats but not in mice. The underlying mechanisms are not fully understood, but because of the high doses employed and since the medicinal product is intended for single application in humans, these findings are not considered relevant for clinical use.
Netupitant and combination with palonosetron: Effects in non-clinical studies based on safety pharmacology and single and repeated dose toxicity were observed only at exposures considered in excess of the maximum human exposure, indicating little relevance to clinical use. Phospholipidosis (foamy macrophages) has been observed with the administration of netupitant after repeated administration in rats and dogs. The effects were reversible or partially reversible after the recovery period. The significance of these findings in humans is unknown.
Non-clinical studies indicate that netupitant and its metabolites and the combination with palonosetron only at very high concentrations may block ion channels involved in ventricular de- and re- polarisation and prolong action potential duration. Reproductive studies in animals with netupitant do not indicate direct or indirect harmful effects with respect to fertility, parturition or postnatal development. An increased incidence of positional fetal abnormalities of the limbs and paws, fused sternebrae and agenesis of accessory lung lobe were observed following daily administration of netupitant in rabbits at 10 mg/kg/day and higher during the period of organogenesis. In a pilot dose range finding study in rabbits, cleft palate, microphthalmia and aphakia were observed in four fetuses from one litter in the 30 mg/kg/day group. The relevance of these findings in humans is unknown. No data from animal studies with netupitant are available regarding placental transfer and lactation. Netupitant is not mutagenic.
Indications/Uses
NETUPITANT/PALONOSETRON (AKYNZEO) is indicated in adults for the: Prevention of acute and delayed nausea and vomiting associated with highly emetogenic cisplatin-based cancer chemotherapy.
Prevention of acute and delayed nausea and vomiting associated with moderately emetogenic cancer chemotherapy.
Dosage/Direction for Use
Posology: Adults: One capsule should be administered approximately one hour prior to the start of each chemotherapy cycle.
The recommended oral dexamethasone dose should be reduced by approximately 50% when co-administered with NETUPITANT/PALONOSETRON (AKYNZEO) (see Pharmacology: Pharmacodynamics: Clinical studies administration schedule under Actions and Interactions).
Elderly people: No dosage adjustment is necessary for elderly patients. Caution should be exercised when using this product in patients over 75 years, due to the long half-life of the active substances and the limited experience in this population.
Pediatric population: The safety and efficacy of NETUPITANT/PALONOSETRON (AKYNZEO) in the pediatric population have not been established. No data are available.
Renal impairment:
Dosage adjustment is not considered necessary in patients with mild to severe renal impairment. Renal excretion for netupitant is negligible. Mild to moderate renal impairment does not significantly affect palonosetron pharmacokinetic parameters. Total systemic exposure to intravenous palonosetron increased by approximately 28% in severe renal impairment relative to healthy subjects. The pharmacokinetics of palonosetron or netupitant has not been studied in subjects with end-stage renal disease requiring hemodialysis and no data on the effectiveness or safety of NETUPITANT/PALONOSETRON (AKYNZEO) in these patients are available. Therefore use in these patients should be avoided.
Hepatic impairment: No dosage adjustment is necessary for patients with mild or moderate hepatic impairment (Child-Pugh score 5-8). Limited data exist in patients with severe hepatic impairment (Child Pugh score ≥ 9). As use in patients with severe hepatic impairment may be associated with increased exposure of netupitant, NETUPITANT/PALONOSETRON (AKYNZEO) should be used with caution in these patients (see Pharmacology: Pharmacokinetics under Actions and Precautions).
Method of administration: For oral use.
The hard capsule should be swallowed whole. It can be taken with or without food.
The hard capsule is located inside the middle pocket of the blister.
Overdosage
No specific information is available on the treatment of overdose with NETUPITANT/PALONOSETRON (AKYNZEO). Netupitant doses up to 600 mg and palonosetron doses up to 6 mg have been used in clinical studies without any safety concerns. In case of overdose, the product should be discontinued and general supportive treatment and monitoring should be provided. Because of the antiemetic activity of netupitant and palonosetron, emesis induced by a medicinal product may not be effective. Dialysis studies have not been performed. However, due to the large volume of distribution of palonosetron and netupitant, dialysis is unlikely to be an effective treatment for overdose.
Contraindications
Hypersensitivity to the active substances or to any of the excipients listed in Description.
Pregnancy (see Use in Pregnancy & Lactation).
Special Precautions
Constipation: As palonosetron may increase large bowel transit time, patients with a history of constipation or signs of subacute intestinal obstruction should be monitored following administration. Cases of constipation with fecal impaction requiring hospitalization have been reported in association with palonosetron 750 mcg.
Serotonin syndrome: There have been reports of serotonin syndrome with the use of 5-HT3 antagonists either alone or in combination with other serotonergic medicinal products (including selective serotonin reuptake inhibitors (SSRIs) and serotonin noradrenaline reuptake inhibitors (SNRIs). Appropriate observation of patients for serotonin syndrome-like symptoms is advised.
QT Prolongation: An ECG study was conducted in adult male and female healthy volunteers with oral netupitant either 200 or 600 mg administered in combination with oral palonosetron 500 or 1500 mcg, respectively. The study demonstrated no clinically important effects on ECG parameters: the largest point estimate of the placebo and baseline corrected QTc interval was 7.0 ms (one-sided upper 95% confidence limit 8.8 ms), observed 16 hours after the administration of supratherapeutic doses (600 mg netupitant and 1500 mcg palonosetron). Upper 95% confidence limit of the point estimates of placebo and baseline corrected QTcI was constantly within 10 ms at all time points over 2 days after study drug administration.
However, since NETUPITANT/PALONOSETRON (AKYNZEO) contains a 5-HT3 receptor antagonist, caution should be exercised in concomitant use with medicinal products that increase the QT interval or in patients who have or are likely to develop prolongation of the QT interval. These conditions include patients with a personal or family history of QT prolongation, electrolyte abnormalities, congestive heart failure, bradyarrhythmia, conduction disturbances and in patients taking anti-arrhythmic medicinal products or other medicinal products that lead to QT prolongation or electrolyte abnormalities. Hypokalemia and hypomagnesaemia should be corrected prior to administration.
This product should not be used to prevent nausea and vomiting in the days following chemotherapy if not associated with another chemotherapy administration.
It should not be used to treat nausea and vomiting following chemotherapy.
Caution should be exercised in patients with severe hepatic impairment since limited data are available in these patients.
This product should be used with caution in patients receiving concomitant orally administered active substances that are metabolized primarily through CYP3A4 and with a narrow therapeutic range, such as cyclosporine, tacrolimus, sirolimus, everolimus, alfentanil, diergotamine, ergotamine, fentanyl, and quinidine (see Interactions).
Chemotherapeutic agents that are substrates for CYP3A4: Netupitant is a moderate inhibitor of CYP3A4 and can increase the exposure of chemotherapeutic agents that are substrates for CYP3A4 e.g. docetaxel (see Interactions). Therefore, patients should be monitored for increased toxicity of chemotherapeutic agents that are substrates for CYP3A4, including irinotecan. Furthermore, netupitant may also affect the efficacy of chemotherapeutic agents that need activation by CYP3A4 metabolism.
Excipients: NETUPITANT/PALONOSETRON (AKYNZEO) contains sorbitol and sucrose. Patients with rare hereditary problems of fructose intolerance, glucose-galactose malabsorption or sucrase-isomaltase insufficiency should not take this medicinal product.
It may also contain a trace of lecithin derived from soya. Therefore, patients with known hypersensitivity to peanut or soya should be monitored closely for signs of an allergic reaction.
Effects on ability to drive and use machines: NETUPITANT/PALONOSETRON (AKYNZEO) has moderate influence on the ability to drive and use machines. Since it may induce dizziness, somnolence or fatigue, patients should be cautioned not to drive or use machines if such symptoms occur.
Use In Pregnancy & Lactation
Women of childbearing potential/contraception in females: Women of childbearing potential should not be pregnant or become pregnant while on treatment with NETUPITANT/PALONOSETRON (AKYNZEO). A pregnancy test should be performed on all pre-menopausal women prior to treatment. Women of childbearing potential must use effective contraception during therapy and up to one month after treatment with this medicinal product.
Use in Pregnancy: Netupitant: There are no data about the use of netupitant in pregnant women. Studies in animals have shown reproductive toxicity including teratogenic effects in rabbit without safety margin (see Pharmacology: Toxicology: Preclinical Safety Data under Actions.).
Palonosetron: There are no data about the use of palonosetron in pregnant women. Animal data do not indicate direct or indirect harmful effects of palonosetron with the respect to reproductive toxicity (see Pharmacology: Toxicology: Preclinical Safety Data under Actions).
NETUPITANT/PALONOSETRON (AKYNZEO) is contraindicated during pregnancy.
Use in Lactation: It is unknown whether palonosetron or netupitant are excreted in human milk. A risk to the suckling child cannot be excluded. NETUPITANT/PALONOSETRON (AKYNZEO) should not be used during breast-feeding. Breast-feeding should be discontinued during treatment with NETUPITANT/PALONOSETRON (AKYNZEO) and for 1 month after the last dose.
Fertility: Netupitant: No effect on fertility has been observed in animal studies.
Palonosetron: Degeneration of seminiferous epithelium has been observed in rat study (see Pharmacology: Toxicology: Preclinical Safety Data under Actions).
Adverse Reactions
Summary of the safety profile: Common adverse reactions reported with NETUPITANT/PALONOSETRON (AKYNZEO) were headache (3.6%), constipation (3.0%) and fatigue (1.2%). None of these events was serious.
Tabulated list of adverse reactions: The safety profile of NETUPITANT/PALONOSETRON (AKYNZEO) was evaluated in 1169 cancer patients receiving at least one cycle of highly emetogenic or moderately emetogenic cancer chemotherapies in three double blind, active- controlled studies, Adverse reactions reported at a greater incidence with NETUPITANT/PALONOSETRON (AKYNZEO) than with oral palonosetron 500 mcg alone, are listed below by MedDRA body system organ class and frequency.
The following convention has been used for classification of frequency: 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). (See Table 5.)

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Description of selected adverse reactions: No common adverse reactions are attributable to netupitant, the new component of the fixed combination, since their frequency was similar with oral palonosetron alone. In addition eye swelling, dyspnea and myalgia as adverse reactions have been reported with oral palonosetron but not observed during the development of NETUPITANT/PALONOSETRON (AKYNZEO). All these reactions were uncommon.
Very rare cases of anaphylaxis, anaphylactic/anaphylactoid reactions and shock have been reported from the post-marketing use of intravenous palonosetron.
Drug Interactions
When NETUPITANT/PALONOSETRON (AKYNZEO) is used concomitantly with another CYP3A4 inhibitor, netupitant plasma concentrations could be elevated. When NETUPITANT/PALONOSETRON (AKYNZEO) is used concomitantly with medicinal products that induce CYP3A4 activity, netupitant plasma concentrations could be reduced and this may result in decreased efficacy. This product can increase plasma concentrations of concomitantly administered medicinal products that are metabolized via CYP3A4.
In humans, netupitant is eliminated mainly by hepatic metabolism mediated by CYP3A4 with a marginal renal excretion. At a dose of 300 mg in humans, netupitant is a substrate and moderate inhibitor of CYP3A4. Palonosetron is eliminated from the body through both renal excretion and metabolic pathways, with the latter mediated via multiple CYP enzymes. Palonosetron is mainly metabolised by CYP2D6, with minor contribution by CYP3A4 and CYP1A2 isoenzymes. Based on in vitro studies, palonosetron does not inhibit or induce cytochrome P450 isoenzyme at clinically relevant concentrations.
Interaction between oral netupitant and oral palonosetron: No clinically relevant pharmacokinetic interactions have been observed between oral netupitant and oral palonosetron.
Interaction with CYP3A4 substrates: Dexamethasone: Co-administration of a single dose of 300 mg netupitant with a dexamethasone regimen (20 mg on Day 1, followed by 8 mg twice daily from Day 2 to Day 4) significantly increased the exposure to dexamethasone in a time and dose dependent manner. The AUC0-24 (Day 1), the AUC24-36 (Day 2) and the AUC84-108 and AUC84-∞ (Day 4) of dexamethasone increased 2.4-fold, with co-administration of 300 mg netupitant. The pharmacokinetic profile of netupitant was unchanged when administered in combination with dexamethasone.
As such, the oral dexamethasone dose should be reduced by approximately 50% when co-administered with NETUPITANT/PALONOSETRON (AKYNZEO) (see Dosage & Administration).
Chemotherapeutic medicinal products (docetaxel, etoposide, cyclophosphamide): Exposure to docetaxel and etoposide was increased 37% and 21%, respectively, when co-administered with NETUPITANT/PALONOSETRON (AKYNZEO). No consistent effect was seen with cyclophosphamide after netupitant co-administration.
Oral contraceptives: NETUPITANT/PALONOSETRON (AKYNZEO), when given with a single oral dose of 60 μg ethinylestradiol and 300 μg levonorgestrel had no significant effect on the AUC of ethinylestradiol and increased the AUC of levonorgestrel by 1.4-fold; clinical effects on the efficacy of hormonal contraception are unlikely. No relevant changes of netupitant and palonosetron pharmacokinetics were observed.
Erythromycin and Midazolam: Exposure to erythromycin and midazolam was increased approximately 1.3 and 2.4 fold, respectively, when each was co-administered with netupitant. These effects were not considered clinically important. The pharmacokinetic profile of netupitant was unaffected by the concomitant administration of either midazolam or erythromycin. The potential effects of increased plasma concentrations of midazolam or other benzodiazepines metabolized via CYP3A4 (alprazolam, triazolam) should be considered when coadministering these active substances with NETUPITANT/PALONOSETRON (AKYNZEO).
Serotonergic medicinal products (e.g. SSRIs and SNRIs): There have been reports of serotonin syndrome following concomitant use of 5-HT3 antagonists and other serotonergic medicinal products (including SSRIs and SNRIs) (see Precautions).
Effect of other medicinal products on the pharmacokinetics of NETUPITANT/PALONOSETRON (AKYNZEO): Netupitant is mainly metabolized by CYP3A4; therefore, co-administration with medicinal products that inhibit or induce CYP3A4 activity may influence plasma concentrations of netupitant. Consequently, concomitant administration with strong CYP3A4 inhibitors (e.g., ketoconazole) should be approached with caution and concomitant administration with strong CYP3A4 inducers (e.g., rifampicin) should be avoided.
Effect of ketoconazole and rifampicin: Administration of the CYP3A4 inhibitor ketoconazole with NETUPITANT/PALONOSETRON (AKYNZEO) increased the AUC of netupitant 1.8 fold and Cmax 1.3 fold when compared to the administration of NETUPITANT/PALONOSETRON (AKYNZEO) alone. Co-administation with ketoconazole did not affect the pharmacokinetics of palonosetron.
Administration of the CYP3A4 inducer rifampicin with NETUPITANT/PALONOSETRON (AKYNZEO) alone decreased the AUC of netupitant 5.2 fold and Cmax 2.6 fold. Co-administration of rifampicin did not affect the pharmacokinetics of palonosetron. Consequently, concomitant administration with strong CYP3A4 inhibitors (e.g., ketoconazole) should be approached with caution and concomitant administration with strong CYP3A4 inducers (e.g. rifampicin) should be avoided.
Additional interactions: NETUPITANT/PALONOSETRON (AKYNZEO) is unlikely to interact with medicinal products which are P-gp substrates. Netupitant is not a substrate for P-gp. When netupitant was administered on Day 8 of a 12-day regimen of digoxin, no changes in digoxin pharmacokinetics were observed.
Inhibition of the efflux transported BCRP and glucuronidation isozyme UGT2B7 by netupitant and its metabolites is unlikely and, if it occurs, of scarce clinical relevance.
In vitro data shows that netupitant inhibits UGT2B7, the magnitude of such an effect in the clinical setting is not established. Caution is recommended when netupitant is combined with an oral substrate of this enzyme (e.g.zidovudine, valproic acid, morphine).
In vitro data suggests that netupitant inhibits the efflux of transporter BCRP. The clinical relevance of this effect is not established. In vitro data show that netupitant is a P-gp inhibitor. In a study performed in healthy volunteers, netupitant does not affect the exposure of digoxin, a P-gp substrate, whereas it increases its Cmax by 1.09 fold [90%CI 0.9-1.31]. It is not excluded that this effect may be more marked, and then clinically relevant, in cancer patients, notably those having abnormal renal function. Therefore, caution is recommended when netupitant is combined with digoxin or with other P-gp substrates such as dabigatran, or colchicine.
Caution For Usage
Incompatibilities: Not applicable.
Special precautions for disposal: Any unused medicinal product or waste material should be disposed of in accordance with local requirements.
Storage
Store at temperatures not exceeding 30°C.
Shelf-Life: 36 months.
ATC Classification
A04AA55 - palonosetron, combinations ; Belongs to the class of serotonin (5HT3) antagonists. Used for the prevention of nausea and vomiting.
Presentation/Packing
Cap (opaque gelatin capsule of size "0" (length 21.7 mm) with white body and caramel cap with "HE1" printed on the body. The hard capsule is filled with three tablets and one soft capsule) 1's.
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