NDC 55513-222 Nplate

Romiplostim Injection, Powder, Lyophilized, For Solution Subcutaneous

NDC Product Code 55513-222

NDC CODE: 55513-222

Proprietary Name: Nplate What is the Proprietary Name?
The proprietary name also known as the trade name is the name of the product chosen by the medication labeler for marketing purposes.

Non-Proprietary Name: Romiplostim What is the Non-Proprietary Name?
The non-proprietary name is sometimes called the generic name. The generic name usually includes the active ingredient(s) of the product.

Drug Use Information

Drug Use Information
The drug use information is a summary and does NOT have all possible information about this product. This information does not assure that this product is safe, effective, or appropriate. This information is not individual medical advice and does not substitute for the advice of a health care professional. Always ask a health care professional for complete information about this product and your specific health needs.

  • This medication is used to treat a certain blood disorder (idiopathic thrombocytopenia purpura - ITP) in which the blood does not clot properly due to a lack of platelets. Platelets are a type of blood cell needed to form blood clots and prevent bleeding. Romiplostim decreases your risk of bleeding by increasing the number of platelets. Romiplostim acts like a certain natural substance (thrombopoietin) that causes the body to produce platelets.

NDC Code Structure

NDC 55513-222-01

Package Description: 1 VIAL in 1 CARTON > 1 mL in 1 VIAL

NDC Product Information

Nplate with NDC 55513-222 is a human prescription drug product labeled by Amgen Inc. The generic name of Nplate is romiplostim. The product's dosage form is injection, powder, lyophilized, for solution and is administered via subcutaneous form.

Dosage Form: Injection, Powder, Lyophilized, For Solution - A dosage form intended for the solution prepared by lyophilization ("freeze drying"), a process which involves the removal of water from products in the frozen state at extremely low pressures; this is intended for subsequent addition of liquid to create a solution that conforms in all respects to the requirements for Injections.

Product Type: Human Prescription Drug What kind of product is this?
Indicates the type of product, such as Human Prescription Drug or Human Over the Counter Drug. This data element matches the “Document Type” field of the Structured Product Listing.

Nplate Active Ingredient(s)

What is the Active Ingredient(s) List?
This is the active ingredient list. Each ingredient name is the preferred term of the UNII code submitted.

RxNorm Crosswalk

What is RxNorm?
RxNorm is a normalized naming system for generic and branded drugs that assigns unique concept identifier(s) (RxCUI) to each NDC.

The RxNorm Crosswalk for this NDC code indicates multiple concept unique identifiers (RXCUI) are associated with this product:

Inactive Ingredient(s)

About the Inactive Ingredient(s)
The inactive ingredients are all the component of a medicinal product OTHER than the active ingredient(s). The acronym "UNII" stands for “Unique Ingredient Identifier” and is used to identify each inactive ingredient present in a product.

  • HISTIDINE (UNII: 4QD397987E)
  • SUCROSE (UNII: C151H8M554)

Administration Route(s)

What are the Administration Route(s)?
The translation of the route code submitted by the firm, indicating route of administration.

  • Subcutaneous - Administration beneath the skin; hypodermic. Synonymous with the term SUBDERMAL.

Pharmacologic Class(es)

What is a Pharmacological Class?
These are the reported pharmacological class categories corresponding to the SubstanceNames listed above.

Product Labeler Information

What is the Labeler Name?
Name of Company corresponding to the labeler code segment of the Product NDC.

Labeler Name: Amgen Inc
Labeler Code: 55513
FDA Application Number: BLA125268 What is the FDA Application Number?
This corresponds to the NDA, ANDA, or BLA number reported by the labeler for products which have the corresponding Marketing Category designated. If the designated Marketing Category is OTC Monograph Final or OTC Monograph Not Final, then the Application number will be the CFR citation corresponding to the appropriate Monograph (e.g. “part 341”). For unapproved drugs, this field will be null.

Marketing Category: BLA - A product marketed under an approved Biologic License Application. What is the Marketing Category?
Product types are broken down into several potential Marketing Categories, such as NDA/ANDA/BLA, OTC Monograph, or Unapproved Drug. One and only one Marketing Category may be chosen for a product, not all marketing categories are available to all product types. Currently, only final marketed product categories are included. The complete list of codes and translations can be found at www.fda.gov/edrls under Structured Product Labeling Resources.

Start Marketing Date: 08-25-2008 What is the Start Marketing Date?
This is the date that the labeler indicates was the start of its marketing of the drug product.

Listing Expiration Date: 12-31-2023 What is the Listing Expiration Date?
This is the date when the listing record will expire if not updated or certified by the product labeler.

Exclude Flag: N - NO What is the NDC Exclude Flag?
This field indicates whether the product has been removed/excluded from the NDC Directory for failure to respond to FDA"s requests for correction to deficient or non-compliant submissions ("Y"), or because the listing certification is expired ("E"), or because the listing data was inactivated by FDA ("I"). Values = "Y", "N", "E", or "I".

* Please review the disclaimer below.

Information for Patients

Romiplostim Injection

Romiplostim Injection is pronounced as (roe mi ploe' stim)

Why is romiplostim injection medication prescribed?
Romiplostim injection is used to increase the number of platelets (cells that help the blood to clot) in order to decrease the risk of bleeding in people who have chronic...
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* Please review the disclaimer below.

Nplate Product Labeling Information

The product labeling information includes all published material associated to a drug. Product labeling documents include information like generic names, active ingredients, ingredient strength dosage, routes of administration, appearance, usage, warnings, inactive ingredients, etc.

Product Labeling Index

1       Indications And Usage

  • Nplate is indicated for the treatment of thrombocytopenia in patients with chronic immune thrombocytopenia (ITP) who have had an insufficient response to corticosteroids, immunoglobulins, or splenectomy. Limitations of Use: Nplate is not indicated for the treatment of thrombocytopenia due to myelodysplastic syndrome (MDS) or any cause of thrombocytopenia other than chronic ITP [see Warnings and Precautions (5.1)]. Nplate should be used only in patients with ITP whose degree of thrombocytopenia and clinical condition increases the risk for bleeding [see Warnings and Precautions (5.2)]. Nplate should not be used in an attempt to normalize platelet counts [see Warnings and Precautions (5.2)].
  • Use the lowest dose of Nplate to achieve and maintain a platelet count ≥ 50 x 109/L as necessary to reduce the risk for bleeding. Administer Nplate as a weekly subcutaneous injection with dose adjustments based upon the platelet count response. The prescribed Nplate dose may consist of a very small volume (eg, 0.15 mL). Administer Nplate only with a syringe that contains 0.01 mL graduations.Initial DoseThe initial dose for Nplate is 1 mcg/kg based on actual body weight.Dose AdjustmentsUse the actual body weight at initiation of therapy, then adjust the weekly dose of Nplate by increments of 1 mcg/kg until the patient achieves a platelet count ≥ 50 x 109/L as necessary to reduce the risk for bleeding; do not exceed a maximum weekly dose of 10 mcg/kg. In clinical studies, most patients who responded to Nplate achieved and maintained platelet counts ≥ 50 x 109/L with a median dose of 2 mcg/kg. During Nplate therapy, assess CBCs, including platelet counts, weekly until a stable platelet count (≥ 50 x 109/L for at least 4 weeks without dose adjustment) has been achieved. Obtain CBCs, including platelet counts, monthly thereafter. Adjust the dose as follows:If the platelet count is < 50 x 109/L, increase the dose by 1 mcg/kg.If platelet count is > 200 x 109/L for 2 consecutive weeks, reduce the dose by 1 mcg/kg.If platelet count is > 400 x 109/L, do not dose. Continue to assess the platelet count weekly. After the platelet count has fallen to < 200 x 109/L, resume Nplate at a dose reduced by 1 mcg/kg.DiscontinuationDiscontinue Nplate if the platelet count does not increase to a level sufficient to avoid clinically important bleeding after 4 weeks of Nplate therapy at the maximum weekly dose of 10 mcg/kg [see Warnings and Precautions (5.3)]. Obtain CBCs, including platelet counts, weekly for at least 2 weeks following discontinuation of Nplate [see Warnings and Precautions (5.4)].

2.2       Preparation And Administration

To mitigate against medication errors (both overdose and underdose), ensure that these preparation and administration instructions are followed.Calculate the dose and reconstitute with the correct volume of sterile water for injection. Withdraw the appropriate volume of the calculated dose from the vial. Only administer subcutaneously [see Overdosage (10)].Nplate is supplied in single-dose vials as a sterile, preservative-free, white lyophilized powder that must be reconstituted as outlined in Table 1 and administered using a syringe with 0.01 mL graduations. Using aseptic technique, reconstitute Nplate with preservative-free Sterile Water for Injection, USP, as described in Table 1. Do not use bacteriostatic water for injection.Table 1. Reconstitution of Nplate Single-Dose VialsNplateSingle-Dose VialTotal Vial Contentof Nplate*Sterile Waterfor Injection**Deliverable Productand VolumeFinalConcentration250 mcg375 mcgadd0.72 mL=250 mcg in 0.5 mL500 mcg/mL500 mcg625 mcgadd1.2 mL=500 mcg in 1 mL500 mcg/mL* Total vial content includes overfill to ensure delivery of 250 mcg or 500 mcg. ** Use preservative-free Sterile Water for Injection.Gently swirl and invert the vial to reconstitute. Avoid excess or vigorous agitation: DO NOT SHAKE. Generally, dissolution of Nplate takes less than 2 minutes.  The reconstituted Nplate solution should be clear and colorless.  Visually inspect the reconstituted solution for particulate matter and/or discoloration.  Do not administer Nplate if particulate matter and/or discoloration is observed.Reconstituted Nplate can be kept at room temperature (25°C/77°F) or refrigerated at 2° to 8°C (36° to 46°F) for up to 24 hours prior to administration. Protect the reconstituted product from light.To determine the injection volume to be administered, first identify the patient’s total dose in micrograms (mcg) using the dosing information in Section 2.1.  For example, a 75 kg patient initiating therapy at 1 mcg/kg will begin with a dose of 75 mcg.  Next, calculate the volume of Nplate solution that is given to the patient by dividing the microgram dose by the concentration of the reconstituted Nplate solution (500 mcg/mL).  For this patient example, the 75 mcg dose is divided by 500 mcg/mL, resulting in an injection volume of 0.15 mL.As the injection volume may be very small, use a syringe with graduations to 0.01 mL. Verify that the syringe contains the correct dosage.Discard any unused portion. Do not pool unused portions from the vials. Do not administer more than one dose from a vial.

2.3       Use Of Nplate With Concomitant Medical Itp Therapies

Nplate may be used with other medical ITP therapies, such as corticosteroids, danazol, azathioprine, intravenous immunoglobulin (IVIG), and anti-D immunoglobulin. If the patient’s platelet count is ≥ 50 x 109/L, medical ITP therapies may be reduced or discontinued [see Clinical Studies (14.1)].

3       Dosage Forms And Strengths

For injection: 250 mcg or 500 mcg of deliverable romiplostim as a sterile, lyophilized, solid white powder in single-dose vials.

4       Contraindications


5.1       Risk Of Progression Of Myelodysplastic Syndromes To Acute Myelogenous Leukemia

Progression from myelodysplastic syndromes (MDS) to acute myelogenous leukemia (AML) has been observed in clinical trials with Nplate. A randomized, double-blind, placebo-controlled trial enrolling patients with severe thrombocytopenia and International Prognostic Scoring System (IPSS) low or intermediate-1 risk MDS was terminated due to more cases of AML observed in the Nplate arm. This trial consisted of a 58-week study period with a 5-year long-term follow-up phase. The subjects were randomized 2:1 to treatment with Nplate or placebo (167 Nplate, 83 placebo). During the 58-week study period, progression to AML occurred in 10 (6.0%) subjects in the Nplate arm and 4 (4.8%) subjects in the placebo arm (hazard ratio [95%CI] = 1.20 [0.38, 3.84]). Of the 250 subjects, 210 (84.0%) entered the long-term follow-up phase of this study. With 5-years of follow-up, 29 (11.6%) subjects showed progression to AML, including 20/168 (11.9%) subjects in the Nplate arm versus 9/82 (11.0%) subjects in the placebo arm (HR [95% CI] = 1.06 [0.48, 2.33]). The incidence of death (overall survival) was 55.7% (93/167) in the Nplate arm versus 54.2% (45/83) in the placebo arm (HR [95% CI] = 1.03 [0.72, 1.47]). In the baseline low IPSS group, there was a higher incidence of death in the Nplate arm [41.3% (19/46)] compared to the placebo arm [30.4% (7/23)] [HR (95% CI) = 1.59 (0.67, 3.80)]. In a single-arm trial of Nplate given to 72 subjects with thrombocytopenia-related MDS, 8 (11.1%) subjects were reported as having possible disease progression, of which 3 (4.2%) had confirmation of AML during follow-up. In addition, in 3 (4.2%) subjects, increased peripheral blood blast cell counts decreased to baseline after discontinuation of Nplate.Nplate is not indicated for the treatment of thrombocytopenia due to MDS or any cause of thrombocytopenia other than chronic ITP.

5.2       Thrombotic/Thromboembolic Complications

Thrombotic/thromboembolic complications may result from increases in platelet counts with Nplate use. Portal vein thrombosis has been reported in patients with chronic liver disease receiving Nplate. To minimize the risk for thrombotic/thromboembolic complications, do not use Nplate in an attempt to normalize platelet counts. Follow the dose adjustment guidelines [see Dosage and Administration (2.1)].

5.3       Loss Of Response To Nplate

Hyporesponsiveness or failure to maintain a platelet response with Nplate should prompt a search for causative factors, including neutralizing antibodies to Nplate [see Adverse Reactions (6.3)]. To detect antibody formation, submit blood samples to Amgen (1-800-772-6436). Amgen will assay these samples for antibodies to Nplate and thrombopoietin (TPO). Discontinue Nplate if the platelet count does not increase to a level sufficient to avoid clinically important bleeding after 4 weeks at the highest weekly dose of 10 mcg/kg.

5.4       Laboratory Monitoring

Obtain CBCs, including platelet counts, weekly during the dose adjustment phase of Nplate therapy and then monthly following establishment of a stable Nplate dose. Obtain CBCs, including platelet counts, weekly for at least 2 weeks following discontinuation of Nplate [see Dosage and Administration (2.1)].

6       Adverse Reactions

  • The following serious adverse reactions are discussed in greater detail in other sections:Progression of Myelodysplastic Syndromes [see Warnings and Precautions (5.1)]Thrombotic/Thromboembolic Complications [see Warnings and Precautions (5.2)]Loss of Response to Nplate [see Warnings and Precautions (5.3)]Laboratory Monitoring [see Warnings and Precautions (5.4)]

6.1       Clinical Trials Experience

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 another drug and may not reflect the rates observed in practice.The data described below reflect Nplate exposure to 271 patients with chronic ITP, aged 18 to 88, of whom 62% were female. Nplate was studied in two randomized, placebo-controlled, double-blind studies that were identical in design, with the exception that Study 1 evaluated nonsplenectomized patients with ITP and Study 2 evaluated splenectomized patients with ITP.  Data are also reported from an open-label, single-arm study in which patients received Nplate over an extended period of time. Overall, Nplate was administered to 114 patients for at least 52 weeks and 53 patients for at least 96 weeks.In the placebo-controlled studies, headache was the most commonly reported adverse drug reaction, occurring in 35% of patients receiving Nplate and 32% of patients receiving placebo. Headaches were usually of mild or moderate severity. Table 2 presents adverse drug reactions from Studies 1 and 2 with a ≥ 5% higher patient incidence in Nplate versus placebo. The majority of these adverse drug reactions were mild to moderate in severity.Table 2. Adverse Drug Reactions Identified in Two Placebo-Controlled StudiesPreferred TermNplate(n = 84)Placebo(n = 41)Arthralgia26%20%Dizziness17%0%Insomnia16%7%Myalgia14%2%Pain in Extremity13%5%Abdominal Pain11%0%Shoulder Pain8%0%Dyspepsia7%0%Paresthesia6%0%Among 142 patients with chronic ITP who received Nplate in the single-arm extension study, the incidence rates of the adverse reactions occurred in a pattern similar to those reported in the placebo-controlled clinical studies.Bone Marrow Reticulin Formation and Collagen FibrosisNplate administration may increase the risk for development or progression of reticulin fiber formation within the bone marrow. This formation may improve upon discontinuation of Nplate. In a clinical trial, one patient with ITP and hemolytic anemia developed marrow fibrosis with collagen during Nplate therapy. An open-label clinical trial prospectively evaluated changes in bone marrow reticulin formation and collagen fibrosis in adult patients with ITP treated with Nplate or a non-US approved romiplostim product.  Patients were administered romiplostim by SC injection once weekly for up to 3 years.  Based on cohort assignment at time of study enrollment, patients were evaluated for bone marrow reticulin and collagen at year 1 (cohort 1), year 2 (cohort 2), or year 3 (cohort 3) in comparison to the baseline bone marrow at start of the trial.  Patients were evaluated for bone marrow reticulin formation and collagen fibrosis using the modified Bauermeister grading scale.  From the total of 169 patients enrolled in the 3 cohorts, 132 (78%) patients were evaluable for bone marrow collagen fibrosis and 131 (78%) patients were evaluable for bone marrow reticulin formation.  Two percent (2/132) of patients (both from cohort 3) developed Grade 4 findings (presence of collagen).  There was no detectable bone marrow collagen in one patient on repeat testing 12 weeks after discontinuation of romiplostim.  Progression of bone marrow reticulin formation (increase greater than or equal to 2 grades or more) or an increase to Grade 4 (presence of collagen) was reported in 7% (9/131) of patients.

6.2       Postmarketing Experience

  • The following adverse reactions have been identified during post approval use of Nplate. 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.ErythromelalgiaHypersensitivity Angioedema

6.3       Immunogenicity

As with all therapeutic proteins, patients may develop antibodies to the therapeutic protein. Patients were screened for immunogenicity to romiplostim using a BIAcore-based biosensor immunoassay.  This assay is capable of detecting both high- and low-affinity binding antibodies that bind to romiplostim and cross-react with TPO.  The samples from patients that tested positive for binding antibodies were further evaluated for neutralizing capacity using a cell-based bioassay.In clinical studies in patients with ITP, the incidence of preexisting antibodies to romiplostim was 5% (53/1112) and the incidence of binding antibody development during treatment with Nplate or a non-US approved romiplostim product was 4% (50/1112).  The incidence of preexisting antibodies to endogenous TPO was 4% (40/1112) and the incidence of binding antibody development to endogenous TPO during treatment was 3% (38/1112). Of the patients with positive binding antibodies that developed to romiplostim or to TPO, five patients had neutralizing activity to romiplostim and none had neutralizing activity to TPO. No apparent correlation was observed between antibody activity and clinical effectiveness or safety.A postmarketing registry study involving patients with thrombocytopenia on Nplate or a non-US approved romiplostim product was conducted to assess the long-term consequences of the anti-romiplostim antibodies.  Patients who lacked response or lost response to Nplate or a non-US approved romiplostim product were enrolled. The incidence of new binding antibody development was 3% (5/186) to romiplostim and 1% (2/186) to TPO.  One patient was positive for binding antibodies to both romiplostim and TPO.  Of the five patients with positive binding antibodies to romiplostim, two (1%) were positive for neutralizing antibodies to romiplostim only.Immunogenicity assay results are highly dependent on the sensitivity and specificity of the assay used in detection and may be influenced by several factors, including sample handling, concomitant medications, and underlying disease. For these reasons, comparison of incidence of antibodies to romiplostim with the incidence of antibodies to other products may be misleading.

7       Drug Interactions

No formal drug interaction studies of Nplate have been performed.

8.1       Pregnancy

Pregnancy Category C There are no adequate and well-controlled studies of Nplate use in pregnant women. In animal reproduction and developmental toxicity studies, romiplostim crossed the placenta, and adverse fetal effects included thrombocytosis, postimplantation loss, and an increase in pup mortality. Nplate should be used during pregnancy only if the potential benefit to the mother justifies the potential risk to the fetus. In rat and rabbit developmental toxicity studies, no evidence of fetal harm was observed at romiplostim doses up to 11 times (rats) and 82 times (rabbits) the maximum human dose (MHD) based on systemic exposure. In mice at doses 5 times the MHD, reductions in maternal body weight and increased postimplantation loss occurred.In a prenatal and postnatal development study in rats, at doses 11 times the MHD, there was an increase in perinatal pup mortality. Romiplostim crossed the placental barrier in rats and increased fetal platelet counts at clinically equivalent and higher doses.Women who become pregnant during Nplate treatment are encouraged to enroll in Amgen’s Pregnancy Surveillance Program.  Patients or their physicians should call 1-800-77-AMGEN (1-800-772-6436) to enroll.

8.3       Nursing Mothers

It is not known whether Nplate is excreted in human milk; however, human IgG is excreted in human milk. Published data suggest that breast milk antibodies do not enter the neonatal and infant circulation in substantial amounts. Because many drugs are excreted in human milk and because of the potential for serious adverse reactions in nursing infants from Nplate, a decision should be made whether to discontinue nursing or to discontinue Nplate, taking into account the importance of Nplate to the mother and the known benefits of nursing.

8.4       Pediatric Use

The safety and effectiveness in pediatric patients (< 18 years) have not been established.

8.5       Geriatric Use

Of the 271 patients who received Nplate in ITP clinical studies, 55 (20%) were age 65 and over, and 27 (10%) were 75 and over. No overall differences in safety or efficacy have been observed between older and younger patients in the placebo-controlled studies, but greater sensitivity of some older individuals cannot be ruled out. In general, dose adjustment for an elderly patient should be cautious, reflecting the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy.

8.6       Renal Impairment

No clinical studies were conducted in patients with renal impairment.

8.7       Hepatic Impairment

No clinical studies were conducted in patients with hepatic impairment.

10       Overdosage

Overdoses due to medication errors have been reported in patients receiving Nplate. In the event of overdose, platelet counts may increase excessively and result in thrombotic/thromboembolic complications. In this case, discontinue Nplate and monitor platelet counts. Reinitiate treatment with Nplate in accordance with dosing and administration recommendations [see Dosage and Administration (2.1, 2.2)].

11       Description

Romiplostim, a member of the TPO mimetic class, is an Fc-peptide fusion protein (peptibody) that activates intracellular transcriptional pathways leading to increased platelet production via the TPO receptor (also known as cMpl). The peptibody molecule contains two identical single-chain subunits, each consisting of human immunoglobulin IgG1 Fc domain, covalently linked at the C-terminus to a peptide containing two thrombopoietin receptor-binding domains. Romiplostim has no amino acid sequence homology to endogenous TPO. Romiplostim is produced by recombinant DNA technology in Escherichia coli (E coli).Nplate (romiplostim) for injection is supplied as a sterile, preservative-free, lyophilized, solid white powder for subcutaneous injection. Two vial presentations are available, which contain a sufficient amount of active ingredient to provide either 250 mcg or 500 mcg of deliverable romiplostim, respectively. Each single-dose 250 mcg vial of Nplate contains the following: 375 mcg romiplostim, 1.2 mg L-histidine, 30 mg mannitol, 0.03 mg polysorbate 20, 15 mg sucrose, and sufficient HCl to adjust the pH to a target of 5.0. Each single-dose 500 mcg vial of Nplate contains the following: 625 mcg romiplostim, 1.9 mg L-histidine, 50 mg mannitol, 0.05 mg polysorbate 20, 25 mg sucrose, and sufficient HCl to adjust the pH to a target of 5.0 [see Dosage and Administration (2.2)].

12.1       Mechanism Of Action

Nplate increases platelet production through binding and activation of the TPO receptor, a mechanism analogous to endogenous TPO.

12.2       Pharmacodynamics

In clinical studies, treatment with Nplate resulted in dose-dependent increases in platelet counts.  After a single subcutaneous dose of 1 to 10 mcg/kg Nplate in patients with chronic ITP, the peak platelet count was 1.3 to 14.9 times greater than the baseline platelet count over a 2- to 3-week period. The platelet counts were above 50 x 109/L for seven out of eight patients with chronic ITP who received six weekly doses of Nplate at 1 mcg/kg.

12.3       Pharmacokinetics

In the long-term extension study in patients with ITP receiving weekly treatment of Nplate subcutaneously, the pharmacokinetics of romiplostim over the dose range of 3 to 15 mcg/kg indicated that peak serum concentrations of romiplostim were observed about 7 to 50 hours post dose (median: 14 hours) with half-life values ranging from 1 to 34 days (median: 3.5 days). The serum concentrations varied among patients and did not correlate with the dose administered. The elimination of serum romiplostim is in part dependent on the TPO receptor on platelets. As a result, for a given dose, patients with high platelet counts are associated with low serum concentrations and vice versa. In another ITP clinical study, no accumulation in serum concentrations was observed (n = 4) after six weekly doses of Nplate (3 mcg/kg). The accumulation at higher doses of romiplostim is unknown.

13.1       Carcinogenesis, Mutagenesis, Impairment Of Fertility

The carcinogenic potential of romiplostim has not been evaluated. The mutagenic potential of romiplostim has not been evaluated. Romiplostim had no effect on the fertility of rats at doses up to 37 times the MHD based on systemic exposure.

13.2       Animal Toxicology And/Or Pharmacology

In a 4-week repeat-dose toxicity study in which rats were dosed subcutaneously three times per week, romiplostim caused extramedullary hematopoiesis, bone hyperostosis, and marrow fibrosis at clinically equivalent and higher doses. In this study, these findings were not observed in animals after a 4-week post treatment recovery period. Studies of long-term treatment with romiplostim in rats have not been conducted; therefore, it is not known if the fibrosis of the bone marrow is reversible in rats after long-term treatment.

14.1       Chronic Itp

The safety and efficacy of Nplate were assessed in two double-blind, placebo-controlled clinical studies and in an open-label extension study.Studies 1 and 2In Studies 1 and 2, patients with chronic ITP who had completed at least one prior treatment and had a platelet count of ≤ 30 x 109/L prior to study entry were randomized (2:1) to 24 weeks of Nplate (1 mcg/kg subcutaneous [SC]) or placebo. Prior ITP treatments in both study groups included corticosteroids, immunoglobulins, rituximab, cytotoxic therapies, danazol, and azathioprine. Patients already receiving ITP medical therapies at a constant dosing schedule were allowed to continue receiving these medical treatments throughout the studies. Rescue therapies (ie, corticosteroids, IVIG, platelet transfusions, and anti-D immunoglobulin) were permitted for bleeding, wet purpura, or if the patient was at immediate risk for hemorrhage. Patients received single weekly SC injections of Nplate, with individual dose adjustments to maintain platelet counts (50 x 109/L to 200 x 109/L).Study 1 evaluated patients who had not undergone a splenectomy. The patients had been diagnosed with ITP for approximately 2 years and had received a median of three prior ITP treatments. Overall, the median platelet count was 19 x 109/L at study entry. During the study, the median weekly Nplate dose was 2 mcg/kg (25th–75th percentile: 1–3 mcg/kg).Study 2 evaluated patients who had undergone a splenectomy. The patients had been diagnosed with ITP for approximately 8 years and had received a median of six prior ITP treatments. Overall, the median platelet count was 14 x 109/L at study entry. During the study, the median weekly Nplate dose was 3 mcg/kg (25th–75th percentile: 2–7 mcg/kg). Study 1 and 2 outcomes are shown in Table 3. A durable platelet response was the achievement of a weekly platelet count ≥ 50 x 109/L for any 6 of the last 8 weeks of the 24-week treatment period in the absence of rescue medication at any time. A transient platelet response was the achievement of any weekly platelet counts ≥ 50 x 109/L for any 4 weeks during the treatment period without a durable platelet response. An overall platelet response was the achievement of either a durable or a transient platelet response. Platelet responses were excluded for 8 weeks after receiving rescue medications.Table 3. Results From Placebo-Controlled StudiesaStudy 1 Nonsplenectomized PatientsStudy 2 Splenectomized PatientsOutcomesNplate(n = 41)Placebo(n = 21)Nplate(n = 42)Placebo(n = 21)Platelet Responses and Rescue TherapyDurable Platelet Response, n (%)25 (61%)1 (5%)16 (38%)0 (0%)Overall Platelet Response, n (%)36 (88%)3 (14%)33 (79%)0 (0%)Number of Weeks With Platelet Counts ≥ 50 x 109/L, average151120Requiring Rescue Therapy, n (%)8 (20%)13 (62%)11 (26%)12 (57%)Reduction/Discontinuation of Baseline Concurrent ITP Medical TherapyReceiving Therapy at Baseline(n = 11)(n = 10)(n = 12)(n = 6)Patients Who Had > 25% Dose Reduction in Concurrent Therapy, n (%)4/11(36%)2/10(20%)4/12(33%)1/6(17%)Patients Who Discontinued Baseline Therapy, n (%)b4/11(36%)3/10(30%)8/12(67%)0/6(0%)a All p values < 0.05 for platelet response and rescue therapy comparisons between Nplate and placebo.b For multiple concomitant baseline therapies, all therapies were discontinued.In Studies 1 and 2, nine patients reported a serious bleeding event [five (6%) Nplate, four (10%) placebo]. Bleeding events that were Grade 2 severity or higher occurred in 15% of patients treated with Nplate and 34% of patients treated with placebo.Extension StudyPatients who had participated in either Study 1 or Study 2 were withdrawn from study medications. If platelet counts subsequently decreased to ≤ 50 x 109/L, the patients were allowed to receive Nplate in an open-label extension study with weekly dosing based on platelet counts.  Following Nplate discontinuation in Studies 1 and 2, seven patients maintained platelet counts of ≥ 50 x 109/L. Among 100 patients who subsequently entered the extension study, platelet counts were increased and sustained regardless of whether they had received Nplate or placebo in the prior placebo-controlled studies.  The majority of patients reached a median platelet count of 50 x 109/L after receiving one to three doses of Nplate, and these platelet counts were maintained throughout the remainder of the study with a median duration of Nplate treatment of 60 weeks and a maximum duration of 96 weeks.

16       How Supplied/Storage And Handling

Nplate (romiplostim) for injection is supplied as a sterile, preservative-free, solid white lyophilized powder in single-dose vials that deliver 250 mcg (NDC 55513-221-01) and 500 mcg (NDC 55513-222-01) of romiplostim.Store Nplate vials in the refrigerator at 2º to 8º C (36º to 46º F) in the original carton to protect from light until time of use. Do not freeze.If needed, unopened Nplate vials may be stored in the original carton at room temperature up to a maximum of 25º C (77º F ) for a single period of up to 30 days. The new expiration date must be written in the space provided on the carton. Once stored at room temperature, do not place back in the refrigerator. If not used within the 30 days, discard Nplate.

17       Patient Counseling Information

  • Advise the patient to read the FDA-approved patient labeling (Medication Guide). Information for PatientsPrior to treatment, patients should fully understand the risks and benefits of Nplate. Inform patients that the risks associated with long-term administration of Nplate are unknown.Inform patients of the following risks and considerations for Nplate:Nplate therapy is administered to achieve and maintain a platelet count ≥ 50 x 109/L as necessary to reduce the risk for bleeding; Nplate is not used to normalize platelet counts.Following discontinuation of Nplate, thrombocytopenia and risk of bleeding may develop that is worse than that experienced prior to the Nplate therapy.Nplate therapy may increase the risk of reticulin fiber formation within the bone marrow. This formation may improve upon discontinuation. Detection of peripheral blood cell abnormalities may necessitate a bone marrow examination.Too much Nplate may result in excessive platelet counts and a risk for thrombotic/thromboembolic complications.Nplate stimulates certain bone marrow cells to make platelets and increases the risk of progression to acute myelogenous leukemia in patients with myelodysplastic syndromes.Platelet counts and CBCs must be performed weekly until a stable Nplate dose has been achieved; thereafter, platelet counts and CBCs must be performed monthly while taking Nplate.Patients must be closely monitored with weekly platelet counts and CBCs for at least 2 weeks following Nplate discontinuation.Even with Nplate therapy, patients should continue to avoid situations or medications that may increase the risk for bleeding.Nplate® (romiplostim)Manufactured by:Amgen Inc.One Amgen Center DriveThousand Oaks, California 91320-1799U.S. License No. 1080Patent: http://pat.amgen.com/nplate/© 2008-2017 Amgen Inc. All rights reserved.www.nplate.com1xxxxxV12

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