Epogen overdosage can cause hemoglobin levels above the desired level, which should be managed with discontinuation or reduction of Epogen dosage and/or with phlebotomy, as clinically indicated. Cases of severe hypertension have been observed following overdose with ESAs.
Epogen is contraindicated in patients with:
Epogen from multiple-dose vials contains benzyl alcohol and is contraindicated in:
Epogen is indicated for the treatment of anemia due to chronic kidney disease (CKD), including patients on dialysis and not on dialysis to decrease the need for red blood cell (RBC) transfusion.
Anemia Due To Zidovudine In Patients With HIV-infectionEpogen is indicated for the treatment of anemia due to zidovudine administered at ≤ 4200 mg/week in patients with HIV-infection with endogenous serum erythropoietin levels of ≤ 500 mUnits/mL.
Anemia Due To Chemotherapy In Patients With CancerEpogen is indicated for the treatment of anemia in patients with non-myeloid malignancies where anemia is due to the effect of concomitant myelosuppressive chemotherapy, and upon initiation, there is a minimum of two additional months of planned chemotherapy.
Reduction Of Allogeneic Red Blood Cell Transfusions In Patients Undergoing Elective, Noncardiac, Nonvascular SurgeryEpogen is indicated to reduce the need for allogeneic RBC transfusions among patients with perioperative hemoglobin > 10 to ≤ 13 g/dL who are at high risk for perioperative blood loss from elective, noncardiac, nonvascular surgery. Epogen is not indicated for patients who are willing to donate autologous blood preoperatively.
Limitations Of UseEpogen has not been shown to improve quality of life, fatigue, or patient well-being.
Epogen is not indicated for use:
Epogen increases the reticulocyte count within 10 days of initiation, followed by increases in the RBC count, hemoglobin, and hematocrit, usually within 2 to 6 weeks. The rate of hemoglobin increase varies among patients and is dependent upon the dose of Epogen administered. For correction of anemia in hemodialysis patients, a greater biologic response is not observed at doses exceeding 300 Units/kg 3 times weekly.
In adult and pediatric patients with CKD, the elimination half-life (t½) of plasma erythropoietin after intravenous administration of Epogen ranged from 4 to 13 hours. After subcutaneous administration, Cmax was achieved within 5 to 24 hours. The t½ in adult patients with serum creatinine greater than 3 mg/dL was similar between those not on dialysis and those maintained on dialysis. The pharmacokinetic data indicate no apparent difference in Epogen t½ among adult patients above or below 65 years of age.
A pharmacokinetic study comparing 150 Units/kg subcutaneous 3 times weekly to 40,000 Units subcutaneous weekly dosing regimen was conducted for 4 weeks in healthy subjects (n = 12) and for 6 weeks in anemic cancer patients (n = 32) receiving cyclic chemotherapy. There was no accumulation of serum erythropoietin after the 2 dosing regimens during the study period. The 40,000 Units weekly regimen had a higher Cmax (3-to 7-fold), longer Tmax (2-to 3-fold), higher AUC0-168 h (2-to 3-fold) of erythropoietin and lower clearance (CL)(50%) than the 150 Units/kg 3 times weekly regimen. In anemic cancer patients, the average t½ was similar (40 hours with range of 16 to 67 hours) after both dosing regimens. After the 150 Units/kg 3 times weekly dosing, the values of Tmax and CL were similar (13.3 ± 12.4 vs. 14.2 ± 6.7 hours, and 20.2 ± 15.9 vs. 23.6 ± 9.5 mL/hr/kg) between week 1 when patients were receiving chemotherapy (n = 14) and week 3 when patients were not receiving chemotherapy (n = 4). Differences were observed after the 40,000 Units weekly dosing with longer Tmax (38 ± 18 hours) and lower CL (9.2 ± 4.7 mL/hr/kg) during week 1 when patients were receiving chemotherapy (n = 18) compared with those (22 ± 4.5 hours, 13.9 ± 7.6 mL/hr/kg, respectively) during week 3 when patients were not receiving chemotherapy (n = 7).
The pharmacokinetic profile of Epogen in pediatric patients appeared similar to that of adults.
The pharmacokinetics of Epogen has not been studied in patients with HIV-infection.
Epogen from multiple-dose vials contains benzyl alcohol and is contraindicated in pregnant women. When therapy with Epogen is needed during pregnancy, use a benzyl alcohol-free formulation (i.e., single-dose vial). Do not mix Epogen with bacteriostatic saline when administering to pregnant women because it contains benzyl alcohol (see Clinical Considerations).
The limited available data on Epogen use in pregnant women are insufficient to determine a drug-associated risk of adverse developmental outcomes. In animal reproductive and developmental toxicity studies, adverse fetal effects including embryo-fetal death, skeletal anomalies, and growth defects occurred when pregnant rats received epoetin alfa at doses approximating the clinical recommended starting doses (see Data). Consider the benefits and risks of Epogen single-dose vials for the mother and possible risks to the fetus when prescribing Epogen to a pregnant woman.
The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risks of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.
Clinical ConsiderationsFetal/Neonatal Adverse Reactions
The multiple-dose vials of Epogen contain benzyl alcohol. The preservative benzyl alcohol has been associated with serious adverse reactions and death when administered intravenously to neonates and infants. There is a potential for similar risks to fetuses exposed to benzyl alcohol in utero.
DataHuman Data
There are reports of pregnant women with anemia alone or anemia associated with severe renal disease and other hematologic disorders who received Epogen. Polyhydramnios and intrauterine growth restriction were reported in women with chronic renal disease, which is associated with an increased risk for these adverse pregnancy outcomes.
Due to the limited number of exposed pregnancies and multiple confounding factors (such as underlying maternal conditions, other maternal medications, and gestational timing of exposure), these published case reports and studies do not reliably estimate the frequency, presence or absence of adverse outcomes.
Animal Data
When rats received Epogen at doses greater than or equal to 100 Units/kg/day during mating and through early pregnancy (dosing stopped prior to organogenesis), there were slight increases in the incidences of pre-and post-implantation loss, and a decrease in live fetuses in the presence of maternal toxicity (red limbs/pinna, focal splenic capsular toxicity, increased organ weights). This animal dose level of 100 Units/kg/day may approximate the clinical recommended starting dose, depending on the treatment indication. When pregnant rats and rabbits received intravenous doses of up to 500 mg/kg/day of Epogen only during organogenesis (gestational days 7 to 17 in rats and gestational days 6 to 18 in rabbits), no teratogenic effects were observed in the offspring. The offspring (F1 generation) of the treated rats were observed postnatally; rats from the F1 generation reached maturity and were mated; no Epogen-related effects were apparent for their offspring (F2 generation fetuses).
When pregnant rats received Epogen at doses of 500 Units/kg/day late in pregnancy (after the period of organogenesis from day 17 of gestation through day 21 of lactation), pups exhibited decreased number of caudal vertebrae, decreased body weight gain, and delayed appearance of abdominal hair, eyelid opening, and ossification in the presence of maternal toxicity (red limbs/pinna, increased organ weights). This animal dose level of 500 U/kg/day is approximately five times the clinical recommended starting dose depending on the patient's treatment indication.
Epogen (epoetin alfa) injection is a sterile, clear, and colorless solution available as:
Preservative-free, single-dose vials (in citrate-buffered formulation): 2,000 Units/mL (NDC 55513-126-10), 3,000 Units/mL (NDC 55513-267-10), 4,000 Units/mL (NDC 55513-148-10), or 10,000 Units/mL (NDC 55513-144-10) supplied in dispensing packs containing ten 1 mL single-dose vials.
Preserved, multiple-dose vial: 20,000 Units/2 mL (10,000 Units/mL) (NDC 55513-283-10) supplied in dispensing packs containing ten 2 mL multiple-dose vials.
Preserved, multiple-dose vial: 20,000 Units/mL (NDC 55513-478-10) supplied in dispensing packs containing ten 1 mL multiple-dose vials.
Store at 36°F to 46°F (2°C to 8°C). Do not freeze. Do not shake. Do not use Epogen that has been shaken or frozen. Store Epogen vials in the original carton until use to protect from light.
Manufactured by: Amgen Inc. One Amgen Center Drive Thousand Oaks, CA 91320-1799 U.S.A. Revised: Sep 2017
Included as part of the PRECAUTIONS section.
PRECAUTIONS Increased Mortality, Myocardial Infarction, Stroke, And ThromboembolismThe design and overall results of the 3 large trials comparing higher and lower hemoglobin targets are shown in Table 1.
Table 1: Randomized Controlled Trials Showing Adverse
Cardiovascular Outcomes in Patients With CKD
| Normal Hematocrit Study (NHS) (N = 1265) |
CHOIR (N = 1432) |
TREAT (N = 4038) |
|
| Time Period of Trial | 1993 to 1996 | 2003 to 2006 | 2004 to 2009 |
| Population | CKD patients on hemodialysis with coexisting CHF or CAD, hematocrit 30 ± 3% on epoetin alfa | CKD patients not on dialysis with hemoglobin < 11 g/dL not previously administered epoetin alfa | CKD patients not on dialysis with type II diabetes, hemoglobin ≤ 11 g/dL |
| Hemoglobin Target; Higher vs. Lower (g/dL) | 14.0 vs. 10.0 | 13.5 vs. 11.3 | 13.0 vs. ≥ 9.0 |
| Median (Q1, Q3) Achieved Hemoglobin level (g/dL) | 12.6 (11.6, 13.3) vs. 10.3 (10.0, 10.7) | 13.0 (12.2, 13.4) vs. 11.4 (11.1, 11.6) | 12.5 (12.0, 12.8) vs. 10.6 (9.9, 11.3) |
| Primary Endpoint | All-cause mortality or nonfatal MI | All-cause mortality, MI, hospitalization for CHF, or stroke | All-cause mortality, MI, myocardial ischemia, heart failure, and stroke |
| Hazard Ratio or Relative Risk (95% CI) | 1.28 (1.06 - 1.56) | 1.34 (1.03 - 1.74) | 1.05 (0.94 - 1.17) |
| Adverse Outcome for Higher Target Group | All-cause mortality | All-cause mortality | Stroke |
| Hazard Ratio or Relative Risk (95% CI) | 1.27 (1.04 - 1.54) | 1.48 (0.97 -2.27) | 1.92 (1.38 -2.68) |
Normal Hematocrit Study (NHS): A prospective, randomized, open-label study of 1265 patients with chronic kidney disease on dialysis with documented evidence of congestive heart failure or ischemic heart disease was designed to test the hypothesis that a higher target hematocrit (Hct) would result in improved outcomes compared with a lower target Hct. In this study, patients were randomized to epoetin alfa treatment targeted to a maintenance hemoglobin of either 14 ± 1 g/dL or 10 ± 1 g/dL. The trial was terminated early with adverse safety findings of higher mortality in the high hematocrit target group. Higher mortality (35% vs. 29%) was observed for the patients randomized to a target hemoglobin of 14 g/dL than for the patients randomized to a target hemoglobin of 10 g/dL. For all-cause mortality, the HR=1.27; 95% CI (1.04, 1.54); p=0.018. The incidence of nonfatal myocardial infarction, vascular access thrombosis, and other thrombotic events was also higher in the group randomized to a target hemoglobin of 14 g/dL.
CHOIR: A randomized, prospective trial, 1432 patients with anemia due to CKD who were not undergoing dialysis and who had not previously received epoetin alfa therapy were randomized to epoetin alfa treatment targeting a maintenance hemoglobin concentration of either 13.5 g/dL or 11.3 g/dL. The trial was terminated early with adverse safety findings. A major cardiovascular event (death, myocardial infarction, stroke, or hospitalization for congestive heart failure) occurred in 125 of the 715 patients (18%) in the higher hemoglobin group compared to 97 of the 717 patients (14%) in the lower hemoglobin group [hazard ratio (HR) 1.34, 95% CI: 1.03, 1.74; p = 0.03].
TREAT: A randomized, double-blind, placebo-controlled, prospective trial of 4038 patients with: CKD not on dialysis (eGFR of 20 – 60 mL/min), anemia (hemoglobin levels ≤ 11 g/dL), and type 2 diabetes mellitus, patients were randomized to receive either darbepoetin alfa treatment or a matching placebo. Placebo group patients also received darbepoetin alfa when their hemoglobin levels were below 9 g/dL. The trial objectives were to demonstrate the benefit of darbepoetin alfa treatment of the anemia to a target hemoglobin level of 13 g/dL, when compared to a “placebo” group, by reducing the occurrence of either of two primary endpoints: (1) a composite cardiovascular endpoint of all-cause mortality or a specified cardiovascular event (myocardial ischemia, CHF, MI, and CVA) or (2) a composite renal endpoint of all-cause mortality or progression to end stage renal disease. The overall risks for each of the two primary endpoints (the cardiovascular composite and the renal composite) were not reduced with darbepoetin alfa treatment (see Table 1), but the risk of stroke was increased nearly two-fold in the darbepoetin alfa -treated group versus the placebo group: annualized stroke rate 2.1% vs. 1.1%, respectively, HR 1.92; 95% CI: 1.38, 2.68; p < 0.001. The relative risk of stroke was particularly high in patients with a prior stroke: annualized stroke rate 5.2% in the darbepoetin alfa-treated group and 1.9% in the placebo group, HR 3.07; 95% CI: 1.44, 6.54. Also, among darbepoetin alfa -treated subjects with a past history of cancer, there were more deaths due to all causes and more deaths adjudicated as due to cancer, in comparison with the control group.
Patients With CancerAn increased incidence of thromboembolic reactions, some serious and life-threatening, occurred in patients with cancer treated with ESAs.
In a randomized, placebo-controlled study (Study 2 in Table 2 ) of 939 women with metastatic breast cancer receiving chemotherapy, patients received either weekly epoetin alfa or placebo for up to a year. This study was designed to show that survival was superior when epoetin alfa was administered to prevent anemia (maintain hemoglobin levels between 12 and 14 g/dL or hematocrit between 36% and 42%). This study was terminated prematurely when interim results demonstrated a higher mortality at 4 months (8.7% vs. 3.4%) and a higher rate of fatal thrombotic reactions (1.1% vs. 0.2%) in the first 4 months of the study among patients treated with epoetin alfa. Based on Kaplan-Meier estimates, at the time of study termination, the 12-month survival was lower in the epoetin alfa group than in the placebo group (70% vs. 76%; HR 1.37, 95% CI: 1.07, 1.75; p = 0.012).
Patients Having SurgeryAn increased incidence of deep venous thrombosis (DVT) in patients receiving epoetin alfa undergoing surgical orthopedic procedures was demonstrated. In a randomized, controlled study, 680 adult patients, not receiving prophylactic anticoagulation and undergoing spinal surgery, were randomized to 4 doses of 600 Units/kg epoetin alfa (7, 14, and 21 days before surgery, and the day of surgery) and standard of care (SOC) treatment (n = 340) or to SOC treatment alone (n = 340). A higher incidence of DVTs, determined by either color flow duplex imaging or by clinical symptoms, was observed in the epoetin alfa group (16 [4.7%] patients) compared with the SOC group (7 [2.1%] patients). In addition to the 23 patients with DVTs included in the primary analysis, 19 [2.8%] patients (n = 680) experienced 1 other thrombovascular event (TVE) each (12 [3.5%] in the epoetin alfa group and 7 [2.1%] in the SOC group). Deep venous thrombosis prophylaxis is strongly recommended when ESAs are used for the reduction of allogeneic RBC transfusions in surgical patients.
Increased mortality was observed in a randomized, placebo-controlled study of Epogen in adult patients who were undergoing CABG surgery (7 deaths in 126 patients randomized to Epogen versus no deaths among 56 patients receiving placebo). Four of these deaths occurred during the period of study drug administration and all 4 deaths were associated with thrombotic events.
Increased Mortality And/Or Increased Risk Of Tumor Progression Or Recurrence In Patients With CancerESAs resulted in decreased locoregional control/progression-free survival (PFS) and/or overall survival (OS) (see Table 2).
Adverse effects on PFS and/or OS were observed in studies of patients receiving chemotherapy for breast cancer (Studies 1, 2, and 4), lymphoid malignancy (Study 3), and cervical cancer (Study 5); in patients with advanced head and neck cancer receiving radiation therapy (Studies 6 and 7); and in patients with non-small cell lung cancer or various malignancies who were not receiving chemotherapy or radiotherapy (Studies 8 and 9).
Table 2: Randomized, Controlled Studies With Decreased
Survival and/or Decreased Locoregional Control
| Study/Tumor/(n) | Hemoglobin Target | Achieved Hemoglobin (Median; Q1, Q3*) | Primary Efficacy Outcome | Adverse Outcome for ESA-containing Arm |
| Chemotherapy | ||||
| Study 1 Metastatic breast cancer (n = 2098) | ≤12 g/dL† | 11.6 g/dL; 10.7, 12.1 g/dL | Progression-free survival (PFS) | Decreased progression-free and overall survival |
| Study 2 Metastatic breast cancer (n = 939) | 12-14 g/dL | 12.9 g/dL; 12.2, 13.3 g/dL | 12-month overall survival | Decreased 12-month survival |
| Study 3 Lymphoid malignancy (n = 344) | 13-15 g/dL (M) 13-14 g/dL (F) | 11 g/dL; 9.8, 12.1 g/dL | Proportion of patients achieving a hemoglobin response | Decreased overall survival |
| Study 4 Early breast cancer (n = 733) | 12.5-13 g/dL | 13.1 g/dL; 12.5, 13.7 g/dL | Relapse-free and overall survival | Decreased 3-year relapse-free and overall survival |
| Study 5 Cervical cancer (n = 114) | 12-14 g/dL | 12.7 g/dL; 12.1, 13.3 g/dL | Progression-free and overall survival and locoregional control | Decreased 3-year progression-free and overall survival and locoregional control |
| Radiotherapy Alone | ||||
| Study 6 Head and neck cancer (n = 351) | ≥ 15 g/dL (M) ≥ 14 g/dL (F) | Not available | Locoregional progression-free survival | Decreased 5-year locoregional progression-free and overall survival |
| Study 7 Head and neck cancer (n = 522) | 14-15.5 g/dL | Not available | Locoregional disease control | Decreased locoregional disease control |
| No Chemotherapy or Radiotherapy | ||||
| Study 8 Non-small cell lung cancer (n = 70) | 12-14 g/dL | Not available | Quality of life | Decreased overall survival |
| Study 9 Non-myeloid malignancy (n = 989) | 12-13 g/dL | 10.6 g/dL; 9.4, 11.8 g/dL | RBC transfusions | Decreased overall survival |
| *Q1= 25th percentile; Q3= 75th percentile †This study did not include a defined hemoglobin target. Doses were titrated to achieve and maintain the lowest hemoglobin level sufficient to avoid transfusion and not to exceed 12 g/dL. |
||||
Study 2 was described in the previous section. Mortality at 4 months (8.7% vs. 3.4%) was significantly higher in the epoetin alfa arm. The most common investigator-attributed cause of death within the first 4 months was disease progression; 28 of 41 deaths in the epoetin alfa arm and 13 of 16 deaths in the placebo arm were attributed to disease progression. Investigator-assessed time to tumor progression was not different between the 2 groups. Survival at 12 months was significantly lower in the epoetin alfa arm (70% vs. 76%; HR 1.37, 95% CI: 1.07, 1.75; p = 0.012).
Study 3 was a randomized, double-blind study (darbepoetin alfa vs. placebo) conducted in 344 anemic patients with lymphoid malignancy receiving chemotherapy. With a median follow-up of 29 months, overall mortality rates were significantly higher among patients randomized to darbepoetin alfa as compared to placebo (HR 1.36, 95% CI: 1.02, 1.82).
Study 8 was a multicenter, randomized, double-blind study (epoetin alfa vs. placebo) in which patients with advanced non-small cell lung cancer receiving only palliative radiotherapy or no active therapy were treated with epoetin alfa to achieve and maintain hemoglobin levels between 12 and 14 g/dL. Following an interim analysis of 70 patients (planned accrual 300 patients), a significant difference in survival in favor of the patients in the placebo arm of the study was observed (median survival 63 vs. 129 days; HR 1.84; p = 0.04).
Study 9 was a randomized, double-blind study (darbepoetin alfa vs. placebo) in 989 anemic patients with active malignant disease, neither receiving nor planning to receive chemotherapy or radiation therapy. There was no evidence of a statistically significant reduction in proportion of patients receiving RBC transfusions. The median survival was shorter in the darbepoetin alfa treatment group than in the placebo group (8 months vs. 10.8 months; HR 1.30, 95% CI: 1.07, 1.57).
Decreased Progression-free Survival And Overall SurvivalStudy 1 was a randomized, open-label, multicenter study in 2,098 anemic women with metastatic breast cancer, who received first line or second line chemotherapy. This was a non inferiority study designed to rule out a 15% risk increase in tumor progression or death of epoetin alfa plus standard of care (SOC) as compared with SOC alone. The median progression free survival (PFS) per investigator assessment of disease progression was 7.4 months in each arm (HR 1.09, 95% CI: 0.99, 1.20), indicating the study objective was not met. At the time of clinical data cutoff, 1337 deaths were reported. Median overall survival in the epoetin alfa plus SOC group was 17.2 months compared with 17.4 months in the SOC alone group (HR 1.06, 95% CI: 0.95, 1.18). There were more deaths from disease progression in the epoetin alfa plus SOC arm (59% vs. 56%) and more thrombotic vascular events in the epoetin alfa plus SOC arm (3% vs. 1%).
Study 4 was a randomized, open-label, controlled, factorial design study in which darbepoetin alfa was administered to prevent anemia in 733 women receiving neo-adjuvant breast cancer treatment. A final analysis was performed after a median follow-up of approximately 3 years. The 3-year survival rate was lower (86% vs. 90%; HR 1.42, 95% CI: 0.93, 2.18) and the 3-year relapse-free survival rate was lower (72% vs. 78%; HR 1.33, 95% CI: 0.99, 1.79) in the darbepoetin alfa-treated arm compared to the control arm.
Study 5 was a randomized, open-label, controlled study that enrolled 114 of a planned 460 cervical cancer patients receiving chemotherapy and radiotherapy. Patients were randomized to receive epoetin alfa to maintain hemoglobin between 12 and 14 g/dL or to RBC transfusion support as needed. The study was terminated prematurely due to an increase in thromboembolic adverse reactions in epoetin alfa-treated patients compared to control (19% vs. 9%). Both local recurrence (21% vs. 20%) and distant recurrence (12% vs. 7%) were more frequent in epoetin alfa-treated patients compared to control. Progression-free survival at 3 years was lower in the epoetin alfa-treated group compared to control (59% vs. 62%; HR 1.06, 95% CI: 0.58, 1.91). Overall survival at 3 years was lower in the epoetin alfa-treated group compared to control (61% vs. 71%; HR 1.28, 95% CI: 0.68, 2.42).
Study 6 was a randomized, placebo-controlled study in 351 head and neck cancer patients where epoetin beta or placebo was administered to achieve target hemoglobins ≥ 14 and ≥ 15 g/dL for women and men, respectively. Locoregional progression-free survival was significantly shorter in patients receiving epoetin beta (HR 1.62, 95% CI: 1.22, 2.14; p = 0.0008) with medians of 406 days and 745 days in the epoetin beta and placebo arms, respectively. Overall survival was significantly shorter in patients receiving epoetin beta (HR 1.39, 95% CI: 1.05, 1.84; p = 0.02).
Decreased Locoregional ControlStudy 7 was a randomized, open-label, controlled study conducted in 522 patients with primary squamous cell carcinoma of the head and neck receiving radiation therapy alone (no chemotherapy) who were randomized to receive darbepoetin alfa to maintain hemoglobin levels of 14 to 15.5 g/dL or no darbepoetin alfa. An interim analysis performed on 484 patients demonstrated that locoregional control at 5 years was significantly shorter in patients receiving darbepoetin alfa (RR 1.44, 95% CI: 1.06, 1.96; p = 0.02). Overall survival was shorter in patients receiving darbepoetin alfa (RR 1.28, 95% CI: 0.98, 1.68; p = 0.08).
HypertensionEpogen is contraindicated in patients with uncontrolled hypertension. Following initiation and titration of Epogen, approximately 25% of patients on dialysis required initiation of or increases in antihypertensive therapy; hypertensive encephalopathy and seizures have been reported in patients with CKD receiving Epogen.
Appropriately control hypertension prior to initiation of and during treatment with Epogen. Reduce or withhold Epogen if blood pressure becomes difficult to control. Advise patients of the importance of compliance with antihypertensive therapy and dietary restrictions.
SeizuresEpogen increases the risk of seizures in patients with CKD. During the first several months following initiation of Epogen, monitor patients closely for premonitory neurologic symptoms. Advise patients to contact their healthcare practitioner for new-onset seizures, premonitory symptoms or change in seizure frequency.
Lack Or Loss Of Hemoglobin Response To EpogenFor lack or loss of hemoglobin response to Epogen, initiate a search for causative factors (e.g., iron deficiency, infection, inflammation, bleeding). If typical causes of lack or loss of hemoglobin response are excluded, evaluate for PRCA. In the absence of PRCA, follow dosing recommendations for management of patients with an insufficient hemoglobin response to Epogen therapy.
Pure Red Cell AplasiaCases of PRCA and of severe anemia, with or without other cytopenias that arise following the development of neutralizing antibodies to erythropoietin have been reported in patients treated with Epogen. This has been reported predominantly in patients with CKD receiving ESAs by subcutaneous administration. PRCA has also been reported in patients receiving ESAs for anemia related to hepatitis C treatment (an indication for which Epogen is not approved).
If severe anemia and low reticulocyte count develop during treatment with Epogen, withhold Epogen and evaluate patients for neutralizing antibodies to erythropoietin. Contact Amgen (1-800-77-AMGEN) to perform assays for binding and neutralizing antibodies. Permanently discontinue Epogen in patients who develop PRCA following treatment with Epogen or other erythropoietin protein drugs. Do not switch patients to other ESAs.
Serious Allergic ReactionsSerious allergic reactions, including anaphylactic reactions, angioedema, bronchospasm, skin rash, and urticaria may occur with Epogen. Immediately and permanently discontinue Epogen and administer appropriate therapy if a serious allergic or anaphylactic reaction occurs.
Severe Cutaneous ReactionsBlistering and skin exfoliation reactions including Erythema multiforme and Stevens-Johnson Syndrome (SJS)/Toxic Epidermal Necrolysis (TEN), have been reported in patients treated with ESAs (including Epogen) in the postmarketing setting. Discontinue Epogen therapy immediately if a severe cutaneous reaction, such as SJS/TEN, is suspected.
Risk Of Serious Adverse Reactions Due To Benzyl Alcohol PreservativeEpogen from multiple-dose vials contains benzyl alcohol and is contraindicated for use in neonates, infants, pregnant women, and lactating women. In addition, do not mix Epogen with bacteriostatic saline (which also contains benzyl alcohol) when administering Epogen to these patient populations.
Serious and fatal reactions including “gasping syndrome” can occur in neonates and infants treated with benzyl alcohol-preserved drugs, including Epogen multiple-dose vials. The “gasping syndrome” is characterized by central nervous system depression, metabolic acidosis, and gasping respirations. There is a potential for similar risks to fetuses and infants exposed to benzyl alcohol in utero or in breast-fed milk, respectively. Epogen multiple-dose vials contain 11 mg of benzyl alcohol per mL. The minimum amount of benzyl alcohol at which serious adverse reactions may occur is not known.
Risk Of Infectious Diseases Due To Albumin (Human) ContentEpogen contains albumin, a derivative of human blood. Based on effective donor screening and product manufacturing processes, it carries an extremely remote risk for transmission of viral diseases. A theoretical risk for transmission of Creutzfeldt-Jakob disease (CJD) also is considered extremely remote. No cases of transmission of viral diseases or CJD have ever been identified for albumin.
Dialysis ManagementPatients may require adjustments in their dialysis prescriptions after initiation of Epogen. Patients receiving Epogen may require increased anticoagulation with heparin to prevent clotting of the extracorporeal circuit during hemodialysis.
Patient Counseling InformationAdvise the patient to read the FDA-approved patient labeling (Medication Guide and Instructions for Use).
Inform patients:
Instruct patients who self-administer Epogen of the:
The carcinogenic potential of Epogen has not been evaluated.
Epogen was not mutagenic or clastogenic under the conditions tested: Epogen was negative in the in vitro bacterial reverse mutation assay (Ames test), in the in vitro mammalian cell gene mutation assay (the hypoxanthine-guanine phosphoribosyl transferase [HGPRT] locus), in an in vitro chromosomal aberration assay in mammalian cells, and in the in vivo mouse micronucleus assay.
When administered intravenously to male and female rats prior to and during mating, and to females through the beginning of implantation (up to gestational day 7; dosing stopped prior to the beginning of organogenesis), doses of 100 and 500 Units/kg/day of Epogen caused slight increases in pre-implantation loss, post-implantation loss and decreases in the incidence of live fetuses. It is not clear whether these effects reflect a drug effect on the uterine environment or on the conceptus. This animal dose level of 100 Units/kg/day approximates the clinical recommended starting dose, depending on the patient's treatment indication, but may be lower than the clinical dose in patients whose doses have been adjusted.
Use In Specific Populations Pregnancy Risk SummaryEpogen from multiple-dose vials contains benzyl alcohol and is contraindicated in pregnant women. When therapy with Epogen is needed during pregnancy, use a benzyl alcohol-free formulation (i.e., single-dose vial). Do not mix Epogen with bacteriostatic saline when administering to pregnant women because it contains benzyl alcohol (see Clinical Considerations).
The limited available data on Epogen use in pregnant women are insufficient to determine a drug-associated risk of adverse developmental outcomes. In animal reproductive and developmental toxicity studies, adverse fetal effects including embryo-fetal death, skeletal anomalies, and growth defects occurred when pregnant rats received epoetin alfa at doses approximating the clinical recommended starting doses (see Data). Consider the benefits and risks of Epogen single-dose vials for the mother and possible risks to the fetus when prescribing Epogen to a pregnant woman.
The estimated background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risks of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.
Clinical ConsiderationsFetal/Neonatal Adverse Reactions
The multiple-dose vials of Epogen contain benzyl alcohol. The preservative benzyl alcohol has been associated with serious adverse reactions and death when administered intravenously to neonates and infants. There is a potential for similar risks to fetuses exposed to benzyl alcohol in utero.
DataHuman Data
There are reports of pregnant women with anemia alone or anemia associated with severe renal disease and other hematologic disorders who received Epogen. Polyhydramnios and intrauterine growth restriction were reported in women with chronic renal disease, which is associated with an increased risk for these adverse pregnancy outcomes.
Due to the limited number of exposed pregnancies and multiple confounding factors (such as underlying maternal conditions, other maternal medications, and gestational timing of exposure), these published case reports and studies do not reliably estimate the frequency, presence or absence of adverse outcomes.
Animal Data
When rats received Epogen at doses greater than or equal to 100 Units/kg/day during mating and through early pregnancy (dosing stopped prior to organogenesis), there were slight increases in the incidences of pre-and post-implantation loss, and a decrease in live fetuses in the presence of maternal toxicity (red limbs/pinna, focal splenic capsular toxicity, increased organ weights). This animal dose level of 100 Units/kg/day may approximate the clinical recommended starting dose, depending on the treatment indication. When pregnant rats and rabbits received intravenous doses of up to 500 mg/kg/day of Epogen only during organogenesis (gestational days 7 to 17 in rats and gestational days 6 to 18 in rabbits), no teratogenic effects were observed in the offspring. The offspring (F1 generation) of the treated rats were observed postnatally; rats from the F1 generation reached maturity and were mated; no Epogen-related effects were apparent for their offspring (F2 generation fetuses).
When pregnant rats received Epogen at doses of 500 Units/kg/day late in pregnancy (after the period of organogenesis from day 17 of gestation through day 21 of lactation), pups exhibited decreased number of caudal vertebrae, decreased body weight gain, and delayed appearance of abdominal hair, eyelid opening, and ossification in the presence of maternal toxicity (red limbs/pinna, increased organ weights). This animal dose level of 500 U/kg/day is approximately five times the clinical recommended starting dose depending on the patient's treatment indication.
Lactation Risk SummaryEpogen from multiple-dose vials contains benzyl alcohol and is contraindicated in lactating women. Advise a lactating woman not to breastfeed for at least 2 weeks after the last dose.The preservative benzyl alcohol has been associated with serious adverse reactions and death when administered intravenously to neonates and infants. There is a potential for similar risks to infants exposed to benzyl alcohol through human milk.
Do not mix Epogen with bacteriostatic saline containing benzyl alcohol, if administering Epogen to a lactating woman.
There is no information regarding the presence of Epogen in human milk, the effects on the breastfed infant, or the effects on milk production. However, endogenous erythropoietin is present in human milk. Because many drugs are present in human milk, caution should be exercised when Epogen from single-dose vials is administered to a lactating woman.
Pediatric UseThe multiple-dose vials are formulated with benzyl alcohol and are contraindicated for use in neonates and infants. When therapy with Epogen is needed in neonates and infants, use the single-dose vial, which is a benzyl alcohol-free formulation. Do not mix the single-dose vials with bacteriostatic saline when administering Epogen to neonates or infants because it contains benzyl alcohol.
Serious adverse reactions including fatal reactions and the “gasping syndrome” occurred in premature neonates and infants in the neonatal intensive care unit who received drugs containing benzyl alco
Evaluate the iron status in all patients before and during treatment. Administer supplemental iron therapy when serum ferritin is less than 100 mcg/L or when serum transferrin saturation is less than 20%. The majority of patients with CKD will require supplemental iron during the course of ESA therapy.
Monitoring of Response To TherapyCorrect or exclude other causes of anemia (e.g., vitamin deficiency, metabolic or chronic inflammatory conditions, bleeding, etc.) before initiating Epogen. Following initiation of therapy and after each dose adjustment, monitor hemoglobin weekly until the hemoglobin level is stable and sufficient to minimize the need for RBC transfusion..
Selection Of FormulationIn pregnant women, lactating women, neonates, and infants use only single-dose vials (the benzyl alcohol-free formulation).
Patients With Chronic Kidney DiseaseIn controlled trials, patients experienced greater risks for death, serious adverse cardiovascular reactions, and stroke when administered erythropoiesis-stimulating agents (ESAs) to target a hemoglobin level of greater than 11 g/dL. No trial has identified a hemoglobin target level, ESA dose, or dosing strategy that does not increase these risks. Individualize dosing and use the lowest dose of Epogen sufficient to reduce the need for RBC transfusions. Physicians and patients should weigh the possible benefits of decreasing transfusions against the increased risks of death and other serious cardiovascular adverse reactions .
For All Patients With CKDWhen initiating or adjusting therapy, monitor hemoglobin levels at least weekly until stable, then monitor at least monthly. When adjusting therapy consider hemoglobin rate of rise, rate of decline, ESA responsiveness and hemoglobin variability. A single hemoglobin excursion may not require a dosing change.
When treating patients who have chronic kidney disease and cancer, physicians should refer to Warnings and Precautions (5.1 and 5.2).
Zidovudine-Treated Patients With HIV-infection Starting DoseThe recommended starting dose in adults is 100 Units/kg as an intravenous or subcutaneous injection 3 times per week.
Dose AdjustmentDiscontinue Epogen if an increase in hemoglobin is not achieved at a dose of 300 Units/kg for 8 weeks.
Patients On Cancer ChemotherapyInitiate Epogen in patients on cancer chemotherapy only if the hemoglobin is less than 10 g/dL, and if there is a minimum of two additional months of planned chemotherapy.
Use the lowest dose of Epogen necessary to avoid RBC transfusions.
Recommended Starting DoseAdults
Pediatric Patients (5 to 18 years)
Reduce dose by 25% if
Withhold dose if hemoglobin exceeds a level needed to avoid RBC transfusion. Reinitiate at a dose 25% below the previous dose when hemoglobin approaches a level where RBC transfusions may be required.
Dose IncreaseAfter the initial 4 weeks of Epogen therapy, if hemoglobin increases by less than 1 g/dL and remains below 10 g/dL, increase dose to:
After 8 weeks of therapy, if there is no response as measured by hemoglobin levels or if RBC transfusions are still required, discontinue Epogen.
Surgery PatientsThe recommended Epogen regimens are:
Deep venous thrombosis prophylaxis is recommended during Epogen therapy.
Preparation And AdministrationThe following serious adverse reactions are discussed in greater detail in other sections of the label:
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of other drugs and may not reflect the rates observed in practice.
Patients With Chronic Kidney Disease Adult PatientsThree double-blind, placebo-controlled studies, including 244 patients with CKD on dialysis, were used to identify the adverse reactions to Epogen. In these studies, the mean age of patients was 48 years (range: 20 to 80 years). One hundred and thirty-three (55%) patients were men. The racial distribution was as follows: 177 (73%) patients were white, 48 (20%) patients were black, 4 (2%) patients were Asian, 12 (5%) patients were other, and racial information was missing for 3 (1%) patients.
Two double-blind, placebo-controlled studies, including 210 patients with CKD not on dialysis, were used to identify the adverse reactions to Epogen. In these studies, the mean age of patients was 57 years (range: 24 to 79 years). One hundred and twenty-one (58%) patients were men. The racial distribution was as follows: 164 (78%) patients were white, 38 (18%) patients were black, 3 (1%) patients were Asian, 3 (1%) patients were other, and racial information was missing for 2 (1%) patients.
The adverse reactions with a reported incidence of ≥ 5% in Epogen-treated patients and that occurred at a ≥ 1% higher frequency than in placebo-treated patients are shown in the table below:
Table 3: Adverse Reactions in Patients With CKD on
Dialysis
| Adverse Reaction | Epogen-treated Patients (n = 148) |
Placebo-treated Patients (n = 96) |
| Hypertension | 27.7% | 12.5% |
| Arthralgia | 16.2% | 3.1% |
| Muscle spasm | 7.4% | 6.3% |
| Pyrexia | 10.1% | 8.3% |
| Dizziness | 9.5% | 8.3% |
| Medical Device Malfunction (artificial kidney clotting during dialysis) | 8.1% | 4.2% |
| Vascular Occlusion (vascular access thrombosis) | 8.1% | 2.1% |
| Upper respiratory tract infection | 6.8% | 5.2% |
An additional serious adverse reaction that occurred in less than 5% of epoetin alfa-treated dialysis patients and greater than placebo was thrombosis (2.7% Epogen and 1% placebo).
The adverse reactions with a reported incidence of ≥ 5% in Epogen-treated patients and that occurred at a ≥ 1% higher frequency than in placebo-treated patients are shown in the table below:
Table 4: Adverse Reactions in Patients With CKD Not on
Dialysis
| Adverse Reactions | Epogen-treated Patients (n = 131) |
Placebo-treated Patients (n = 79) |
| Hypertension | 13.7% | 10.1% |
| Arthralgia | 12.2% | 7.6% |
Additional serious adverse reactions that occurred in less than 5% of epoetin alfa-treated patients not on dialysis and greater than placebo were erythema (0.8% Epogen and 0% placebo) and myocardial infarction (0.8% Epogen and 0% placebo).
Pediatric PatientsIn pediatric patients with CKD on dialysis, the pattern of adverse reactions was similar to that found in adults.
Zidovudine-Treated Patients With HIV-infectionA total of 297 zidovudine-treated patients with HIV-infection were studied in 4 placebo-controlled studies. A total of 144 (48%) patients were randomly assigned to receive Epogen and 153 (52%) patients were randomly assigned to receive placebo. Epogen was administered at doses between 100 and 200 Units/kg 3 times weekly subcutaneously for up to 12 weeks.
For the combined Epogen treatment groups, a total of 141 (98%) men and 3 (2%) women between the ages of 24 and 64 years were enrolled. The racial distribution of the combined Epogen treatment groups was as follows: 129 (90%) white, 8 (6%) black, 1 (1%) Asian, and 6 (4%) other.
In double-blind, placebo-controlled studies of 3 months duration involving approximately 300 zidovudine-treated patients with HIV-infection, adverse reactions with an incidence of ≥ 1% in patients treated with Epogen were:
Table 5: Adverse Reactions in Zidovudine-treated
Patients with HIV-infection
| Adverse Reaction | Epogen (n = 144) |
Placebo (n = 153) |
| Pyrexia | 42% | 34% |
| Cough | 26% | 14% |
| Rash | 19% | 7% |
| Injection site irritation | 7% | 4% |
| Urticaria | 3% | 1% |
| Respiratory tract congestion | 1% | Not reported |
| Pulmonary embolism | 1% | Not reported |
The data below were obtained in Study C1, a 16-week, double-blind, placebo-controlled study that enrolled 344 patients with anemia secondary to chemotherapy. There were 333 patients who were evaluable for safety; 168 of 174 patients (97%) randomized to Epogen received at least 1 dose of study drug, and 165 of 170 patients (97%) randomized to placebo received at least 1 placebo dose. For the once weekly Epogen-treatment group, a total of 76 men (45%) and 92 women (55%) between the ages of 20 and 88 years were treated. The racial distribution of the Epogen-treatment group was 158 white (94%) and 10 black (6%). Epogen was administered once weekly for an average of 13 weeks at a dose of 20,000 to 60,000 IU subcutaneously (mean weekly dose was 49,000 IU).
The adverse reactions with a reported incidence of ≥ 5% in Epogen-treated patients that occurred at a higher frequency than in placebo-treated patients are shown in the table below:
Table 6: Adverse Reactions in Patients with Cancer
| Adverse Reaction | Epogen (n = 168) |
Placebo (n = 165) |
| Nausea | 35% | 30% |
| Vomiting | 20% | 16% |
| Myalgia | 10% | 5% |
| Arthralgia | 10% | 6% |
| Stomatitis | 10% | 8% |
| Cough | 9% | 7% |
| Weight decrease | 9% | 5% |
| Leukopenia | 8% | 7% |
| Bone pain | 7% | 4% |
| Rash | 7% | 5% |
| Hyperglycemia | 6% | 4% |
| Insomnia | 6% | 2% |
| Headache | 5% | 4% |
| Depression | 5% | 4% |
| Dysphagia | 5% | 2% |
| Hypokalemia | 5% | 3% |
| Thrombosis | 5% | 3% |
Four hundred sixty-one patients undergoing major orthopedic surgery were studied in a placebo-controlled study (S1) and a comparative dosing study (2 dosing regimens, S2). A total of 358 patients were randomly assigned to receive Epogen and 103 (22%) patients were randomly assigned to receive placebo. Epogen was administered daily at a dose of 100 to 300 IU/kg subcutaneously for 15 days or at 600 IU/kg once weekly for 4 weeks.
For the combined Epogen treatment groups, a total of 90 (25%) and 268 (75%) women between the ages of 29 and 89 years were enrolled. The racial distribution of the combined Epogen treatment groups was as follows: 288 (80%) white, 64 (18%) black, 1 (< 1%) Asian, and 5 (1%) other.
The adverse reactions with a reported incidence of ≥ 1% in Epogen-treated patients that occurred at a higher frequency than in placebo-treated patients are shown in the table below:
Table 7: Adverse Reactions in Surgery Patients
| Adverse Reaction | Study S1 | Study S2 | |||
| Epogen 300 U/kg (n = 112)a |
Epogen 100 U/kg (n = 101)a |
Placebo (n = 103)a |
Epogen 600 U/kg x 4 weeks (n = 73)b |
Epogen 300 U/kg x 15 days (n = 72)b |
|
| Nausea | 47% | 43% | 45% | 45% | 56% |
| Vomiting | 21% | 12% | 14% | 19% | 28% |
| Pruritus | 16% | 16% | 14% | 12% | 21% |
| Headache | 13% | 11% | 9% | 10% | 18% |
| Injection site pain | 13% | 9% | 8% | 12% | 11% |
| Chills | 7% | 4% | 1% | 1% | 0% |
| Deep vein thrombosis | 6% | 3% | 3% | 0%c | 0%c |
| Cough | 5% | 4% | 0% | 4% | 4% |
| Hypertension | 5% | 3% | 5% | 5% | 6% |
| Rash | 2% | 2% | 1% | 3% | 3% |
| Edema | 1% | 2% | 2% | 1% | 3% |
| aStudy included patients undergoing orthopedic
surgery treated with Epogen or placebo for 15 days. bStudy included patients undergoing orthopedic surgery treated with Epogen 600 U/kg weekly for 4 weeks or 300 U/kg daily for 15 days. cDVTs were determined by clinical symptoms. |
The following adverse reactions have been identified during post-approval use of Epogen. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
As with all therapeutic proteins, there is a potential for immunogenicity. The detection of antibody formation is highly dependent on the sensitivity and specificity of the assay. Additionally, the observed incidence of antibody (including neutralizing antibody) positivity in an assay may be influenced by several factors, including assay methodology, sample handling, timing of sample collection, concomitant medications, and underlying disease. For these reasons, comparison of the incidence of antibodies to epoetin alfa with the incidence of antibodies to other products may be misleading.
Neutralizing antibodies to epoetin alfa that cross-react with endogenous erythropoietin and other ESAs can result in PRCA or severe anemia (with or without other cytopenias).
