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Ecallantide (Monograph)

Brand name: Kalbitor
Drug class:

Medically reviewed by Drugs.com on Apr 10, 2024. Written by ASHP.

Warning

    Hypersensitivity
  • Potential for severe hypersensitivity reactions (e.g., anaphylaxis). (See Sensitivity Reactions under Cautions.)

  • Clinicians should be aware of the similarity between symptoms of a hypersensitivity reaction and a hereditary angioedema (HAE) attack; administer only in a setting equipped to monitor and treat hypersensitivity reactions and HAE attacks.

  • Do not administer to patients with known hypersensitivity to ecallantide.

Introduction

Selective, reversible plasma kallikrein inhibitor; biosynthetic (recombinant DNA origin) protein.

Uses for Ecallantide

Hereditary Angioedema

Treatment of acute angioedema attacks in patients with hereditary angioedema (HAE).

Designated an orphan drug by FDA for this use.

Ecallantide Dosage and Administration

General

Administration

Sub-Q Administration

Administer by sub-Q injection.

Vials are for single use only.

To prepare a 30-mg dose: Withdraw 1 mL of ecallantide injection from a vial containing 10 mg/mL of the drug into an appropriately sized syringe using a large-bore needle. Perform procedure with each of 3 vials to prepare total dose (3 syringes each containing ecallantide 10 mg).

Prior to administration, replace large-bore needle on each syringe with a 27-gauge needle for sub-Q injection.

Observe strict aseptic technique; drug vials contain no preservative.

Inject sub-Q into abdomen, thigh, or upper arm. Use same anatomic site for all 3 injections or select different sites; separate injections administered at same site by 2 inches (5 cm) and inject away from site of HAE attack. Rotation of injection sites not necessary.

If a second 30 mg-dose is required, may use same anatomic site as for initial dose or select different site.

Dosage

Adults

Hereditary Angioedema
Sub-Q

Patients ≥16 years of age: 30 mg. May administer second 30-mg dose within 24 hours after initial dose for persistent HAE attack symptoms.

Prescribing Limits

Adults

Hereditary Angioedema
Sub-Q

Patients ≥16 years of age: Maximum 60 mg (i.e., two 30-mg doses) in 24-hour period.

Special Populations

Hepatic Impairment

No specific dosage recommendations.

Renal Impairment

No specific dosage recommendations.

Geriatric Patients

Select dosage with caution; usually initiate therapy at low end of dosage range. (See Geriatric Use under Cautions.)

Cautions for Ecallantide

Contraindications

Warnings/Precautions

Sensitivity Reactions

Risk of severe hypersensitivity reactions (e.g., chest discomfort, flushing, pharyngeal edema, pruritus, rhinorrhea, sneezing, nasal congestion, throat irritation, urticaria, wheezing, hypotension), including anaphylaxis. Monitor patient; such reactions usually occur within first hour following drug administration. (See General under Dosage and Administration.)

Because symptoms of hypersensitivity can resemble those of acute HAE attacks, carefully consider treatment method. Use of medical support for anaphylaxis (e.g., epinephrine, antihistamines, corticosteroids) may be required.

Response to antihistamine and sympathomimetic therapy may distinguish between hypersensitivity reaction (a histamine-mediated event) and acute HAE attack (bradykinin-mediated event); hypersensitivity reactions likely to respond to this type of medical intervention, while HAE attack symptoms likely to be resistant.

Immunogenicity

Development of anti-ecallantide antibodies reported occasionally. Neutralizing antibodies to ecallantide also reported, as were IgE antibodies to ecallantide and yeast (Pichia pastoris).

Seroconversion rate increases with number of doses received. Risk of hypersensitivity reactions may be increased in patients with anti-ecallantide antibodies.

Long-term effects of antibody formation not known.

Specific Populations

Pregnancy

Category C.

Lactation

Not known whether ecallantide is distributed into milk. Use caution.

Pediatric Use

Safety and efficacy not established in children <16 years of age.

Geriatric Use

Insufficient experience in patients ≥65 years of age to determine whether geriatric patients respond differently than younger adults; use with caution due to greater frequency of decreased hepatic, renal, and/or cardiac function and of concomitant disease and drug therapy in the elderly.

Hepatic Impairment

Safety and efficacy not established.

Renal Impairment

Safety and efficacy not established.

Common Adverse Effects

Headache, nausea, diarrhea, pyrexia, injection site reactions, nasopharyngitis.

Drug Interactions

No formal drug interaction studies to date.

Ecallantide Pharmacokinetics

Absorption

Bioavailability

Approximately 90%.

Onset

Peak plasma concentrations attained within 2–3 hours following single 30-mg sub-Q dose.

Distribution

Extent

Not known whether distributed into milk.

Elimination

Elimination Route

Excreted in urine; since drug is a small protein, metabolic catabolism (or degradation) also likely.

Half-life

Approximately 2 hours.

Special Populations

Pharmacokinetics not studied in patients with hepatic or renal impairment.

Stability

Storage

Parenteral

Injection

2–8°C. Protect from light.

Vials removed from refrigerator should be stored below 30°C and used within 14 days or returned to refrigeration until use.

Actions

Advice to Patients

Additional Information

The American Society of Health-System Pharmacists, Inc. represents that the information provided in the accompanying monograph was formulated with a reasonable standard of care, and in conformity with professional standards in the field. Readers are advised that decisions regarding use of drugs are complex medical decisions requiring the independent, informed decision of an appropriate health care professional, and that the information contained in the monograph is provided for informational purposes only. The manufacturer’s labeling should be consulted for more detailed information. The American Society of Health-System Pharmacists, Inc. does not endorse or recommend the use of any drug. The information contained in the monograph is not a substitute for medical care.

Preparations

Excipients in commercially available drug preparations may have clinically important effects in some individuals; consult specific product labeling for details.

Please refer to the ASHP Drug Shortages Resource Center for information on shortages of one or more of these preparations.

Ecallantide

Routes

Dosage Forms

Strengths

Brand Names

Manufacturer

Parenteral

Injection, for subcutaneous use

10 mg/mL

Kalbitor

Dyax

AHFS DI Essentials™. © Copyright 2024, Selected Revisions April 10, 2024. American Society of Health-System Pharmacists, Inc., 4500 East-West Highway, Suite 900, Bethesda, Maryland 20814.

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