Aprepitant

Prevention of nausea and vomiting associated with highly and moderately emetogenic cancer chemotherapy in children, toddlers and infants from the age of 6 months to less than 12 years.

EMEND powder for oral suspension is given as part of combination therapy.

The oral suspension should be prepared and the dose measured by healthcare professionals only.

Posology

Paediatric population

Infants, toddlers and children (aged 6 months to less than 12 years, and not less than 6 kg)

EMEND is given for 3 days as part of a regimen that includes a 5-HT₃ antagonist. The recommended dose of EMEND powder for oral suspension is based on weight, as specified in the table below.

EMEND is administered orally 1 hour prior to chemotherapy on Days 1, 2 and 3. If no chemotherapy is given on Days 2 and 3, EMEND should be administered in the morning. See the Summary of Product Characteristics (SmPC) for the selected 5-HT₃ antagonist for appropriate dosing information. If a corticosteroid, such as dexamethasone, is co-administered with EMEND, the dose of the corticosteroid should be administered at 50 % of the usual dose.

Recommended dose of EMEND oral suspension in paediatric patients aged 6 months to less than 12 years

The efficacy of the 125 mg powder for oral suspension has not been established in children 12 years of age and older. For adolescents aged 12-17 years, EMEND is available as capsules containing 80 mg, or 125 mg of aprepitant.

The safety and efficacy of EMEND powder for oral suspension in infants below 6 months of age or weighing less than 6 kg has not been established. No data are available.

General

Efficacy data in combination with other corticosteroids and 5-HT₃ antagonists are limited. Please refer to the SmPC of co-administered 5-HT₃ antagonist medicinal products.

Special populations

Gender

No dose adjustment is necessary based on gender.

Renal impairment

No dose adjustment is necessary for patients with renal impairment or for patients with end stage renal disease undergoing haemodialysis.

Hepatic impairment

No dose adjustment is necessary for patients with mild hepatic impairment. There are limited data in patients with moderate hepatic impairment and no data in patients with severe hepatic impairment. Aprepitant should be used with caution in these patients.

Method of administration

The oral suspension may be taken with or without food.

Co-administration with pimozide, terfenadine, astemizole or cisapride.

Patients with moderate to severe hepatic impairment

There are limited data in patients with moderate hepatic impairment and no data in patients with severe hepatic impairment. EMEND should be used with caution in these patients.

CYP3A4 interactions

EMEND should be used with caution in patients receiving concomitant orally administered active substances that are metabolised primarily through CYP3A4 and with a narrow therapeutic range, such as cyclosporine, tacrolimus, sirolimus, everolimus, alfentanil, ergot alkaloid derivatives, fentanyl, and quinidine. Additionally, concomitant administration with irinotecan should be approached with particular caution as the combination might result in increased toxicity.

Co-administration with warfarin (a CYP2C9 substrate)

In patients on chronic warfarin therapy, the International Normalised Ratio (INR) should be monitored closely during treatment with EMEND and for 14 days following each 3-day course of EMEND.

Co-administration with hormonal contraceptives

The efficacy of hormonal contraceptives may be reduced during and for 28 days after administration of EMEND. Alternative non-hormonal back-up methods of contraception should be used during treatment with EMEND and for 2 months following the last dose of EMEND.

Excipients

EMEND powder for oral suspension contains sucrose and lactose. Patients with rare hereditary problems of fructose or galactose intolerance, glucose-galactose malabsorption, Lapp lactase deficiency, or sucrase-isomaltase insufficiency should not take this medicine.

EMEND may have minor influence on the ability to ride a bicycle and use machines. Dizziness and fatigue may occur following administration of EMEND.

Summary of the safety profile

The safety profile of aprepitant was evaluated in approximately 6,500 adults in more than 50 studies and 184 children and adolescents in 2 pivotal paediatric clinical trials.

The most common adverse reactions reported at a greater incidence in adults treated with the aprepitant regimen than with standard therapy in patients receiving Highly Emetogenic Chemotherapy (HEC) were: hiccups (4.6 % versus 2.9 %), alanine aminotransferase (ALT) increased (2.8 % versus 1.1 %), dyspepsia (2.6 % versus 2.0 %), constipation (2.4 % versus 2.0 %), headache (2.0 % versus 1.8 %), and decreased appetite (2.0 % versus 0.5 %). The most common adverse reaction reported at a greater incidence in patients treated with the aprepitant regimen than with standard therapy in adults receiving Moderately Emetogenic Chemotherapy (MEC) was fatigue (1.4 % versus 0.9 %).

The most common adverse reactions reported at a greater incidence in paediatric patients treated with the aprepitant regimen than with the control regimen while receiving emetogenic cancer chemotherapy were hiccups (3.3 % versus 0.0 %) and flushing (1.1 % versus 0.0 %).

Tabulated list of adverse reactions

The following adverse reactions were observed in a pooled analysis of the HEC and MEC studies at a greater incidence with aprepitant than with standard therapy or in postmarketing use. The frequency categories given in the table are based on the studies in adults; the observed frequencies in the paediatric studies were similar or lower, unless shown in the table. Some less common ADRs in the adult population were not observed in the paediatric studies.

Frequencies are defined as: 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) and very rare (< 1/10,000), not known (cannot be estimated from the available data).

†Nausea and vomiting were efficacy parameters in the first 5 days of post-chemotherapy treatment and were reported as adverse reactions only thereafter.

Description of selected adverse reactions

The adverse reactions profiles in adults in the Multiple-Cycle extension of HEC and MEC studies for up to 6 additional cycles of chemotherapy were generally similar to those observed in Cycle 1.

In an additional active-controlled clinical study in 1,169 patients receiving aprepitant and HEC, the adverse reactions profile was generally similar to that seen in the other HEC studies with aprepitant.

Additional adverse reactions were observed in adult patients treated with aprepitant for postoperative nausea and vomiting (PONV) and a greater incidence than with ondansetron: abdominal pain upper, bowel sounds abnormal, constipation*, dysarthria, dyspnoea, hypoaesthesia, insomnia, miosis, nausea, sensory disturbance, stomach discomfort, sub-ileus*, visual acuity reduced, wheezing.

*Reported in patients taking a higher dose of aprepitant.

Reporting of suspected adverse reactions

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

In the event of overdose, EMEND should be discontinued and general supportive treatment and monitoring should be provided. Because of the antiemetic activity of aprepitant, emesis induced by a medicinal product may not be effective.

Aprepitant cannot be removed by haemodialysis.

Pharmacotherapeutic group: Antiemetics and antinauseants, ATC code: A04AD12

Aprepitant is a selective high-affinity antagonist at human substance P neurokinin 1 (NK₁) receptors.

3-day regimen of aprepitant in adults

In 2 randomised, double-blind studies encompassing a total of 1,094 adult patients receiving chemotherapy that included cisplatin > 70 mg/m², aprepitant in combination with an ondansetron/dexamethasone regimen was compared with a standard regimen (placebo plus ondansetron 32 mg intravenously administered on Day 1 plus dexamethasone 20 mg orally on Day 1 and 8 mg orally twice daily on Days 2 to 4). Although a 32 mg intravenous dose of ondansetron was used in clinical trials, this is no longer the recommended dose. See the product information for the selected 5-HT₃ antagonist for appropriate dosing information.

Efficacy was based on evaluation of the following composite measure: complete response (defined as no emetic episodes and no use of rescue therapy) primarily during Cycle 1. The results were evaluated for each individual study and for the 2 studies combined.

A summary of the key study results from the combined analysis is shown in Table 1.

Table 1

Percent of adult patients receiving Highly Emetogenic Chemotherapy responding by treatment group and phase — Cycle 1

* The confidence intervals were calculated with no adjustment for gender and concomitant chemotherapy, which were included in the primary analysis of odds ratios and logistic models.

^†One patient in the Aprepitant regimen only had data in the acute phase and was excluded from the overall and delayed phase analyses; one patient in the Standard regimen only had data in the delayed phase and was excluded from the overall and acute phase analyses.

The estimated time to first emesis in the combined analysis is depicted by the Kaplan-Meier plot in Figure 1.

Figure 1

Percent of adult patients receiving Highly Emetogenic Chemotherapy who remain emesis free over time - Cycle 1

Statistically significant differences in efficacy were also observed in each of the 2 individual studies.

In the same 2 clinical studies, 851 adult patients continued into the Multiple-Cycle extension for up to 5 additional cycles of chemotherapy. The efficacy of the aprepitant regimen was apparently maintained during all cycles.

In a randomised, double-blind study in a total of 866 adult patients (864 females, 2 males) receiving chemotherapy that included cyclophosphamide 750-1,500 mg/m²; or cyclophosphamide 500-1,500 mg/m² and doxorubicin (≤ 60 mg/m²) or epirubicin (≤ 100 mg/m²), aprepitant in combination with an ondansetron/dexamethasone regimen was compared with standard therapy (placebo plus ondansetron 8 mg orally (twice on Day 1, and every 12 hours on Days 2 and 3) plus dexamethasone 20 mg orally on Day 1).

Efficacy was based on evaluation of the composite measure: complete response (defined as no emetic episodes and no use of rescue therapy) primarily during Cycle 1.

A summary of the key study results is shown in Table 2.

Table 2

Percent of adult patients responding by treatment group and phase — Cycle 1

Moderately Emetogenic Chemotherapy

* The confidence intervals were calculated with no adjustment for age category (< 55 years, > 55 years) and investigator group, which were included in the primary analysis of odds ratios and logistic models.

†One patient in the Aprepitant regimen only had data in the acute phase and was excluded from the overall and delayed phase analyses.

In the same clinical study, 744 adult patients continued into the Multiple-Cycle extension for up to 3 additional cycles of chemotherapy. The efficacy of the aprepitant regimen was apparently maintained during all cycles.

In a second multicentre, randomised, double-blind, parallel-group, clinical study, the aprepitant regimen was compared with standard therapy in 848 adult patients (652 females, 196 males) receiving a chemotherapy regimen that included any intravenous dose of oxaliplatin, carboplatin, epirubicin, idarubicin, ifosfamide, irinotecan, daunorubicin, doxorubicin; cyclophosphamide intravenously (< 1,500 mg/m²); or cytarabine intravenously (> 1 g/m²). Patients receiving the aprepitant regimen were receiving chemotherapy for a variety of tumour types including 52 % with breast cancer, 21 % with gastrointestinal cancers including colorectal cancer, 13 % with lung cancer and 6 % with gynaecological cancers. The aprepitant regimen in combination with an ondansetron/dexamethasone regimen was compared with standard therapy (placebo in combination with ondansetron 8 mg orally (twice on Day 1, and every 12 hours on Days 2 and 3) plus dexamethasone 20 mg orally on Day 1).

Efficacy was based on the evaluation of the following primary and key secondary endpoints: No vomiting in the overall period (0 to 120 hours post-chemotherapy), evaluation of safety and tolerability of the aprepitant regimen for chemotherapy induced nausea and vomiting (CINV), and complete response (defined as no vomiting and no use of rescue therapy) in the overall period (0 to 120 hours post-chemotherapy). Additionally, no significant nausea in the overall period (0 to 120 hours post-chemotherapy) was evaluated as an exploratory endpoint, and in the acute and delayed phases as a post-hoc analysis.

A summary of the key study results is shown in Table 3.

Table 3

Percent of adult patients responding by treatment group and phase for Study 2 - Cycle 1

Moderately Emetogenic Chemotherapy

*The confidence intervals were calculated with no adjustment for gender and region, which were included in the primary analysis using logistic models.

The benefit of aprepitant combination therapy in the full study population was mainly driven by the results observed in patients with poor control with the standard regimen such as in women, even though the results were numerically better regardless of age, tumour type or gender. Complete response to the aprepitant regimen and standard therapy, respectively, was reached in 209/324 (65 %) and 161/320 (50 %) in women and 83/101 (82 %) and 68/87 (78 %) of men.

Paediatric population

In a randomised, double-blind, active comparator-controlled clinical study that included 302 children and adolescents (aged 6 months to 17 years) receiving moderately or highly emetogenic chemotherapy, the aprepitant regimen was compared to a control regimen for the prevention of CINV. The efficacy of the aprepitant regimen was evaluated in a single cycle (Cycle 1). Patients had the opportunity to receive open-label aprepitant in subsequent cycles (Optional Cycles 2-6); however efficacy was not assessed in these optional cycles. The aprepitant regimen for adolescents aged 12 through 17 years (n=47) consisted of EMEND capsules 125 mg orally on Day 1 and 80 mg/day on Days 2 and 3 in combination with ondansetron on Day 1. The aprepitant regimen for children aged 6 months to less than 12 years (n=105) consisted of EMEND powder for oral suspension 3.0 mg/kg (up to 125 mg) orally on Day 1 and 2.0 mg/kg (up to 80 mg) orally on Days 2 and 3 in combination with ondansetron on Day 1. The control regimen in adolescents aged 12 through 17 years (n=48) and children aged 6 months to less than 12 years (n=102) consisted of placebo for aprepitant on Days 1, 2 and 3 in combination with ondansetron on Day 1. EMEND or placebo and ondansetron were administered 1 hour and 30 minutes prior to initiation of chemotherapy, respectively. Intravenous dexamethasone was permitted as part of the antiemetic regimen for paediatric patients in both age groups, at the discretion of the physician. A dose reduction (50 %) of dexamethasone was required for paediatric patients receiving aprepitant. No dose reduction was required for paediatric patients receiving the control regimen. Of the paediatric patients, 29 % in the aprepitant regimen and 28 % in the control regimen used dexamethasone as part of the regimen in Cycle 1.

The antiemetic activity of EMEND was evaluated over a 5-day (120 hour) period following the initiation of chemotherapy on Day 1. The primary endpoint was complete response in the delayed phase (25 to 120 hours following initiation of chemotherapy) in Cycle 1. A summary of the key study results are shown in Table 4.

Table 4

Number (%) of paediatric patients with complete response and no vomiting by treatment group and phase - Cycle 1 (Intent to treat population)

The estimated time to first vomiting after initiation of chemotherapy treatment was longer with the aprepitant regimen (estimated median time to first vomiting was 94.5 hours) compared with the control regimen group (estimated median time to first vomiting was 26.0 hours) as depicted in the Kaplan-Meier curves in Figure 2.

Figure 2

Time to first vomiting episode from start of chemotherapy administration - paediatric patients in the overall phase-Cycle 1 (Intent to treat population)

An analysis of efficacy in subpopulations in Cycle 1 demonstrated that, regardless of age category, gender, use of dexamethasone for antiemetic prophylaxis, and emetogenicity of chemotherapy, the aprepitant regimen provided better control than the control regimen with respect to the complete response endpoints.

Aprepitant displays non-linear pharmacokinetics. Both clearance and absolute bioavailability decrease with increasing dose.

Absorption

The mean absolute oral bioavailability of aprepitant is 67 % for the 80 mg capsule and 59 % for the 125 mg capsule. The mean peak plasma concentration (C_max) of aprepitant occurred at approximately 4 hours (t_max). Oral administration of the capsule with an approximately 800 Kcal standard breakfast resulted in an up to 40 % increase in AUC of aprepitant. This increase is not considered clinically relevant.

The pharmacokinetics of aprepitant is non-linear across the clinical dose range. In healthy young adults, the increase in AUC_0-∞ was 26 % greater than dose proportional between 80 mg and 125 mg single doses administered in the fed state.

Following oral administration of a single 125 mg dose of EMEND on Day 1 and 80 mg once daily on Days 2 and 3, the AUC_0-24hr (mean±SD) was 19.6 ± 2.5 µg-h/mL and 21.2 ± 6.3 µg -h/mL on Days 1 and 3, respectively. C_max was 1.6 ± 0.36 µg/mL and 1.4 ± 0.22 µg/mL on Days 1 and 3, respectively.

Distribution

Aprepitant is highly protein bound, with a mean of 97 %. The geometric mean apparent volume of distribution at steady state (Vd_ss) is approximately 66 L in humans.

Biotransformation

Aprepitant undergoes extensive metabolism. In healthy young adults, aprepitant accounts for approximately 19 % of the radioactivity in plasma over 72 hours following a single intravenous administration 100 mg dose of [¹⁴C]-fosaprepitant, a prodrug for aprepitant, indicating a substantial presence of metabolites in the plasma. Twelve metabolites of aprepitant have been identified in human plasma. The metabolism of aprepitant occurs largely via oxidation at the morpholine ring and its side chains and the resultant metabolites were only weakly active. In vitro studies using human liver microsomes indicate that aprepitant is metabolised primarily by CYP3A4 and potentially with minor contribution by CYP1A2 and CYP2C19.

Elimination

Aprepitant is not excreted unchanged in urine. Metabolites are excreted in urine and via biliary excretion in faeces. Following a single intravenously administered 100 mg dose of [¹⁴C]-fosaprepitant, a prodrug for aprepitant, to healthy subjects, 57 % of the radioactivity was recovered in urine and 45 % in faeces.

The plasma clearance of aprepitant is dose-dependent, decreasing with increased dose and ranged from approximately 60 to 72 mL/min in the therapeutic dose range. The terminal half-life ranged from approximately 9 to 13 hours.

Pharmacokinetics in special populations

Gender: Following oral administration of a single 125 mg dose of aprepitant, the C_max for aprepitant is 16 % higher in females as compared with males. The half-life of aprepitant is 25 % lower in females as compared with males and its t_max occurs at approximately the same time. These differences are not considered clinically meaningful. No dose adjustment for EMEND is necessary based on gender.

Hepatic impairment: Mild hepatic impairment (Child-Pugh class A) does not affect the pharmacokinetics of aprepitant to a clinically relevant extent. No dose adjustment is necessary for patients with mild hepatic impairment. Conclusions regarding the influence of moderate hepatic impairment (Child-Pugh class B) on aprepitant pharmacokinetics cannot be drawn from available data. There are no clinical or pharmacokinetic data in patients with severe hepatic impairment (Child-Pugh class C).

Renal impairment: A single 240 mg dose of aprepitant was administered to patients with severe renal impairment (CrCl < 30 mL/min) and to patients with end stage renal disease (ESRD) requiring haemodialysis.

In patients with severe renal impairment, the AUC_0-∞ of total aprepitant (unbound and protein bound) decreased by 21 % and C_max decreased by 32 %, relative to healthy subjects. In patients with ESRD undergoing haemodialysis, the AUC_0-∞ of total aprepitant decreased by 42 % and C_max decreased by 32 %. Due to modest decreases in protein binding of aprepitant in patients with renal disease, the AUC of pharmacologically active unbound aprepitant was not significantly affected in patients with renal impairment compared with healthy subjects. Haemodialysis conducted 4 or 48 hours after dosing had no significant effect on the pharmacokinetics of aprepitant; less than 0.2 % of the dose was recovered in the dialysate.

No dose adjustment for EMEND is necessary for patients with renal impairment or for patients with ESRD undergoing haemodialysis.

Paediatric population: As part of a 3-day regimen, dosing of aprepitant capsules (125/80/80-mg) in adolescent patients (aged 12 through 17 years) achieved an AUC_0-24hr above 17 µg-hr/mL on Day 1 with concentrations (C_min) at the end of Days 2 and 3 above 0.4 µg/mL in a majority of patients. The median peak plasma concentration (C_max) was approximately 1.3 µg/mL on Day 1, occurring at approximately 4 hours. As part of a 3-day regimen, dosing of aprepitant powder for oral suspension (3/2/2-mg/kg) in patients aged 6 months to less than12 years achieved an AUC_0-24hr above 17 µg-hr/mL on Day 1 with concentrations (C_min) at the end of Days 2 and 3 above 0.1 µg/mL in a majority of patients. The median peak plasma concentration (C_max) was approximately 1.2 µg/mL on Day 1, occurring between 5 and 7 hours.

A population pharmacokinetic analysis of aprepitant in paediatric patients (aged 6 months through 17 years) suggests that gender and race have no clinically meaningful effect on the pharmacokinetics of aprepitant.

Relationship between concentration and effect

Using a highly specific NK₁-receptor tracer, positron emission tomography (PET) studies in healthy young men have shown that aprepitant penetrates into the brain and occupies NK₁ receptors in a dose- and plasma-concentration-dependent manner. Aprepitant plasma concentrations achieved with the 3-day regimen of EMEND in adults are predicted to provide greater than 95 % occupancy of brain NK₁ receptors.

Pre-clinical data reveal no special hazard for humans based on conventional studies of single and repeated dose toxicity, genotoxicity, carcinogenic potential, toxicity to reproduction and development. However, it should be noted that systemic exposure in rodents was similar or even lower than therapeutic exposure in humans at the 125 mg/80 mg dose. In particular, although no adverse effects were noted in reproduction studies at human exposure levels, the animal exposures are not sufficient to make an adequate risk assessment in man.

In a juvenile toxicity study in rats treated from post natal day 10 to day 63 aprepitant led to an earlier vaginal opening in females from 250 mg/kg b.i.d. and to a delayed preputial separation in males, from 10 mg/kg b.i.d. There were no margins to clinically relevant exposure. There were no treatment-related effects on mating, fertility or embryonic/foetal survival, and no pathological changes in the reproductive organs. In a juvenile toxicity study in dogs treated from post natal day 14 to day 42, a decreased testicular weight and Leydig cell size were seen in the males at 6 mg/kg/day and increased uterine weight, hypertrophy of the uterus and cervix, and oedema of vaginal tissues were seen in females from 4 mg/kg/day. There were no margins to clinically relevant exposure of aprepitant. For short term treatment according to recommended dose regimen these findings are considered unlikely to be clinically relevant.

Not applicable.

The content of each single-use sachet is to be suspended in 4.6 mL of water giving a final concentration of 25 mg per mL.

- For more details on preparation and administration of the suspension, see the package leaflet and the instructions for preparation of the oral suspension for healthcare professionals.

- Use the 5 mL oral dispenser to measure 4.6 mL of water, which is added into the mixing cup.

- Pour entire contents of the sachet into the 4.6 mL of water and mix.

- Once mixed, measure the recommended volume (dose) of suspension with the oral dispenser. Choose the oral dispenser based on the dose. Use the 1 mL oral dispenser if the dose is 1 mL or less and use the 5 mL oral dispenser if the dose is more than 1 mL. Administer the dose orally. If the dose is not administered immediately after measuring, the filled oral dispenser can be refrigerated (between 2°C and 8°C) for up to 72 hours prior to use.

- The oral suspension can be kept at room temperature (not above 30°C) for up to 3 hours, prior to administration.

- Discard any remaining suspension and waste material.

Any unused medicinal product or waste material should be disposed of in accordance with local regulations.