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Nplate Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
Nplate (romiplostim) is used to prevent bleeding episodes in people with chronic immune thrombocytopenic purpura (ITP), a bleeding condition caused by a lack of platelets in the blood. It is usually given after other medications have been tried without successful treatment of symptoms. It is a man-made form of a protein that increases production of platelets (blood-clotting cells) in the body. Common side effects include headache, joint/muscle pain, dizziness, heartburn, abdominal pain, tingling/numbness in hands/feet, and trouble sleeping.
The initial dose for Nplate is 1 mcg/kg based on actual body weight. Other drugs may interact with Nplate. Tell your doctor all medications and supplements you use. During pregnancy, Nplate should be used only when prescribed. It is unknown if this drug passes into breast milk. Consult your doctor before breastfeeding.
Our Nplate (romiplostim) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What is Patient Information in Detail?
Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.
Nplate in Detail - Patient Information: Side Effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Less serious side effects may include:
- joint or muscle pain;
- pain in your arms, legs, or shoulder;
- numbness or tingly feeling;
- sleep problems (insomnia); or
- stomach pain or upset.
This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.
Read the entire detailed patient monograph for Nplate (Romiplostim) »
What is Patient Information Overview?
A concise overview of the drug for the patient or caregiver from First DataBank.
Nplate Overview - Patient Information: Side Effects
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
This medication may rarely cause serious problems from blood clots to the heart, brain or lung (such as pulmonary embolism, stroke, heart attack), especially if your platelet counts are too high. Keep all medical/lab test appointments. Seek immediate medical attention if you experience: sudden shortness of breath, chest/jaw/left arm pain, coughing up blood, sudden dizziness/fainting, pain/swelling/warmth in the groin/calf, slurred speech, weakness on one side of the body, vision problems/changes.
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Read the entire patient information overview for Nplate (Romiplostim)»
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Nplate FDA Prescribing Information: Side Effects
The following serious adverse reactions are discussed in greater detail in other sections:
- Progression of Myelodysplastic Syndromes [see WARNINGS AND PRECAUTIONS]
- Thrombotic/Thromboembolic Complications [see WARNINGS AND PRECAUTIONS]
- Loss of Response to Nplate [see WARNINGS AND PRECAUTIONS]
- Laboratory Monitoring [see WARNINGS AND PRECAUTIONS]
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
(n = 84)
(n = 41)
|Pain in Extremity||13%||5%|
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.
Nplate 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. Clinical trials are in progress to assess the risk of bone marrow fibrosis and clinical consequences with cytopenias.
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.
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, the incidence of preexisting antibodies to romiplostim was 8% (43/537) and the incidence of binding antibody development during Nplate treatment was 6% (31/537). The incidence of preexisting antibodies to endogenous TPO was 5% (29/537) and the incidence of binding antibody development to endogenous TPO during Nplate treatment was 4% (21/537). Of the patients with positive binding antibodies that developed to romiplostim or to TPO, two (0.4%) patients had neutralizing activity to romiplostim and none had neutralizing activity to TPO. No correlation was observed between antibody activity and clinical effectiveness or safety.
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.
Read the entire FDA prescribing information for Nplate (Romiplostim) »
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