| Immune thrombocytopenic purpura
Nplate vs Gammaked
Side-by-side clinical, coverage, and cost comparison for immune thrombocytopenic purpura.Deep comparison between: Nplate vs Gammaked with Prescriber.AI
AI compares prescribing info and payer-specific access barriers across 1,200+ formularies. Here's a preview of what prescribers are already asking.Safety signalsGammaked has a higher rate of injection site reactions vs Nplate based on FDA-approved prescribing information
Coverage gaps3 major payers require step therapy for Gammaked but not Nplate, including UnitedHealthcare
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Category
Nplate
Gammaked
At A Glance
SC injection
Once weekly (ITP); single dose (HS-ARS)
Thrombopoietin receptor agonist
IV infusion
Immune globulin
Indications
- Immune thrombocytopenic purpura
- Hematopoietic subsyndrome of acute radiation syndrome
- Primary immune deficiency disorder
- Immune thrombocytopenic purpura
- Polyradiculoneuropathy, Chronic Inflammatory Demyelinating
- Congenital agammaglobulinemia
- Common Variable Immunodeficiency
- X-linked agammaglobulinemia
- Wiskott-Aldrich Syndrome
- Severe Combined Immunodeficiency
Dosing
Immune thrombocytopenic purpura Initial dose 1 mcg/kg SC injection once weekly; adjust by 1 mcg/kg increments based on platelet count; maximum weekly dose 10 mcg/kg.
Hematopoietic subsyndrome of acute radiation syndrome 10 mcg/kg as a single SC injection, administered as soon as possible after suspected or confirmed exposure to myelosuppressive doses of radiation (>2 Gy).
Primary immune deficiency disorder IV: 300-600 mg/kg every 3-4 weeks; SC (PI only): individualized weekly dose calculated as previous IGIV dose (g) x 1.37 divided by number of weeks between IV doses.
Immune thrombocytopenic purpura IV only: total dose 2 g/kg given as 1 g/kg on two consecutive days or 0.4 g/kg on five consecutive days; do not administer subcutaneously.
Polyradiculoneuropathy, Chronic Inflammatory Demyelinating IV only: loading dose 2 g/kg over two to four consecutive days; maintenance 1 g/kg every 3 weeks (or 0.5 g/kg on two consecutive days every 3 weeks).
Contraindications
—
- Previous anaphylactic or severe systemic reaction to human immune globulin
- IgA deficiency with antibodies against IgA and history of hypersensitivity reaction
Adverse Reactions
Most common (>=5%) Arthralgia, myalgia, pain in extremity, shoulder pain, dizziness, paresthesia, insomnia, abdominal pain, dyspepsia (adults); contusion, upper respiratory tract infection, oropharyngeal pain, pyrexia, rash, diarrhea (pediatric)
Serious Progression of myelodysplastic syndromes, thrombotic/thromboembolic complications, loss of response, bone marrow reticulin formation and collagen fibrosis
Postmarketing Erythromelalgia, hypersensitivity reactions including angioedema and anaphylaxis
Most common (>=5%) PI (IV): cough, rhinitis, pharyngitis, headache, asthma, nausea, fever, diarrhea, sinusitis; PI (SC): local infusion site reactions, fatigue, headache, upper respiratory tract infection, arthralgia, diarrhea, nausea, sinusitis, bronchitis, depression, allergic dermatitis, erythema, migraine, myalgia, viral infection, pyrexia; ITP: headache, ecchymosis, vomiting, fever, nausea, rash, abdominal pain, back pain, dyspepsia; CIDP: headache, pyrexia, hypertension, chills, rash, nausea, arthralgia, asthenia
Serious Pulmonary embolism (CIDP), exacerbation of autoimmune pure red cell aplasia (PI), hemolytic anemia
Postmarketing Anaphylaxis, tachycardia, acute renal dysfunction/failure, ARDS, TRALI, pulmonary edema, cardiac arrest, thromboembolism, coma, seizures, aseptic meningitis, Stevens-Johnson syndrome, pancytopenia, hemolytic anemia, hepatic dysfunction
Pharmacology
Thrombopoietin receptor agonist; Fc-peptide fusion protein (peptibody) that binds and activates the TPO receptor to increase platelet production through a mechanism analogous to endogenous TPO.
GAMMAKED is an immune globulin that supplies a broad spectrum of opsonic and neutralizing IgG antibodies against bacterial, viral, parasitic, and mycoplasmal agents and their toxins; the precise mechanism of action in ITP and CIDP has not been fully elucidated.
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Most Common Insurance
Anthem BCBS
Nplate
- Covered on 5 commercial plans
- PA (9/12) · Step Therapy (0/12) · Qty limit (0/12)
Gammaked
- Covered on 5 commercial plans
- PA (10/12) · Step Therapy (10/12) · Qty limit (0/12)
UnitedHealthcare
Nplate
- Covered on 4 commercial plans
- PA (0/8) · Step Therapy (0/8) · Qty limit (0/8)
Gammaked
- Covered on 4 commercial plans
- PA (0/8) · Step Therapy (0/8) · Qty limit (0/8)
Humana
Nplate
- Covered on 0 commercial plans
- PA (1/3) · Step Therapy (1/3) · Qty limit (0/3)
Gammaked
- Covered on 0 commercial plans
- PA (3/3) · Step Therapy (3/3) · Qty limit (0/3)
Coverage data sourced from MMIT. Updated monthly.
Savings
Cost estimate not availableAmgen Safety Net Foundation
Commercial or private insurance
Medicare, Medicaid, VA, TRICARE
No savings programs available for Gammaked.
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Clinical data sourced from FDA-approved labeling. Coverage data via MMIT. Updated monthly.